Nonstationarity of low flows and their timing in the eastern United States
S. Sadri, J. Kam, and J. Sheffield Hydrol. Earth Syst. Sci. Discuss., 12, 2761-2798, doi:10.5194/hessd-12-2761-2015, 2015 AbstractDiscussion Paper (PDF, 2671 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
05 Mar 2015
Technical Note: Approximate solution of transient drawdown for constant-flux pumping at a partially penetrating well in a radial two-zone confined aquifer
Summary: Existing solutions for the problem of constant-flux pumping (CFP) in a two-zone confined aquifer involve laborious calculation. This study develops a new approximate solution for the problem. The solution is in terms of a simple series expanded by integers and thus very convenient for those who are not familiar with numerical methods. A quantitative criterion for the validity of neglecting the vertical flow component due to a partially penetrating well is provided.
C.-S. Huang, S.-Y. Yang, and H.-D. Yeh Hydrol. Earth Syst. Sci. Discuss., 12, 2741-2760, doi:10.5194/hessd-12-2741-2015, 2015 AbstractDiscussion Paper (PDF, 688 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
04 Mar 2015
Identifying the controls of soil loss in agricultural catchments using ex situ turbidity-based suspended sediment monitoring
S. C. Sherriff, J. S. Rowan, A. R. Melland, P. Jordan, O. Fenton, and D. Ó'hUallacháin Hydrol. Earth Syst. Sci. Discuss., 12, 2707-2740, doi:10.5194/hessd-12-2707-2015, 2015 AbstractDiscussion Paper (PDF, 2616 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
03 Mar 2015
Impacts of climate change on temperature, precipitation and hydrology in Finland – studies using bias corrected Regional Climate Model data
T. Olsson, J. Jakkila, N. Veijalainen, L. Backman, J. Kaurola, and B. Vehviläinen Hydrol. Earth Syst. Sci. Discuss., 12, 2657-2706, doi:10.5194/hessd-12-2657-2015, 2015 AbstractDiscussion Paper (PDF, 7267 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
03 Mar 2015
Uniform flow formulas for irregular sections
Summary: We present two new methods for uniform flow computation, named LHRM and INCM
Calibration and 1st validation from laboratory experimental data
2nd validation by field discharge hydrographs estimated by measured water level data
3rd validation from 3D solution of CFX code applied to a reach of the Alzette river
E. Spada, T. Tucciarelli, M. Sinagra, V. Sammartano, and G. Corato Hydrol. Earth Syst. Sci. Discuss., 12, 2607-2655, doi:10.5194/hessd-12-2607-2015, 2015 AbstractDiscussion Paper (PDF, 3504 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
27 Feb 2015
Downscaling future precipitation extremes to urban hydrology scales using a spatio-temporal Neyman–Scott weather generator
H. J. D. Sørup, O. B. Christensen, K. Arnbjerg-Nielsen, and P. S. Mikkelsen Hydrol. Earth Syst. Sci. Discuss., 12, 2561-2605, doi:10.5194/hessd-12-2561-2015, 2015 AbstractDiscussion Paper (PDF, 979 KB)Supplement (10433 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
27 Feb 2015
Characterization of precipitation product errors across the US using multiplicative Triple Collocation
Summary: This paper introduces a new variant of the Triple Collocation technique with multiplicative error model. The method is applied, for the first time, to precipitation products across the central part of Continental US. Results show distinctive patterns of error variance in each product that are estimated without assuming any distribution for the errors a priori. The correlation coefficients between each product and the truth is also estimated which provides another performance perspective.
S. H. Alemohammad, K. A. McColl, A. G. Konings, D. Entekhabi, and A. Stoffelen Hydrol. Earth Syst. Sci. Discuss., 12, 2527-2559, doi:10.5194/hessd-12-2527-2015, 2015 AbstractDiscussion Paper (PDF, 2555 KB)Supplement (6066 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
27 Feb 2015
Simulating the regional water balance through hydrological model based on TRMM satellite rainfall data
Vulnerability of groundwater resources to interaction with river water in a boreal catchment
Summary: Based on low altitude aerial infrared survey, around 370 groundwater–surface water interaction sites were located. Longitudinal temperature patterns, stable isotopes and dissolved silica composition of the studied rivers differed. Interaction sites identified in the proximity of 12 municipal water plants during low-flow seasons should be considered as potential risk areas during flood periods, and should be taken under consideration in river basin management under changing climatic situations.
A. Rautio, A.-L. Kivimäki, K. Korkka-Niemi, M. Nygård, V.-P. Salonen, K. Lahti, and H. Vahtera Hydrol. Earth Syst. Sci. Discuss., 12, 2435-2476, doi:10.5194/hessd-12-2435-2015, 2015 AbstractDiscussion Paper (PDF, 2682 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
25 Feb 2015
Hydrological connectivity as indicated by transport of diatoms through the riparian–stream system
Summary: We tested the hypothesis that different diatom species assemblages inhabit specific moisture domains of the catchment and, consequently, the presence of certain species assemblages in the stream during runoff events inform about hydrological connectivity between these domains. Diatom identification in the different domains suggested rapid connectivity between the soil surface and the stream during events. Results were compared to two-component hydrograph separation and end-member mixing analysis
N. Martínez-Carreras, C. E. Wetzel, J. Frentress, L. Ector, J. J. McDonnell, L. Hoffmann, and L. Pfister Hydrol. Earth Syst. Sci. Discuss., 12, 2391-2434, doi:10.5194/hessd-12-2391-2015, 2015 AbstractDiscussion Paper (PDF, 2062 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
24 Feb 2015
Investigating temporal field sampling strategies for site-specific calibration of three soil moisture – neutron intensity parameterisation methods
Summary: The Cosmic-Ray Neutron Sensor can provide soil moisture content averages over areas of roughly half a kilometre by half a kilometre. Although this sensor is usually calibrated using soil samples taken on a single day, we found multiple sampling days are needed. The calibration results were also affected by the soil wetness conditions of the sampling days. The outcome of this study will help researchers to calibrate/validate new Cosmic-Ray Neutron Sensor sites more accurately.
J. Iwema, R. Rosolem, R. Baatz, T. Wagener, and H. R. Bogena Hydrol. Earth Syst. Sci. Discuss., 12, 2349-2389, doi:10.5194/hessd-12-2349-2015, 2015 AbstractDiscussion Paper (PDF, 3073 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
24 Feb 2015
Large-basin hydrological response to climate model outputs: uncertainty caused by the internal atmospheric variability
Summary: Our paper is one of very few studies where influence of the stochastic internal atmospheric variability (IAV) on the hydrological response is analyzed. On the basis of the ensemble experiments with GCM and hydrological models, we found, e.g., that averaging over ensemble members filters stochastic term related to IAV, and that a considerable portion of the simulated trend in the annual Lena R. runoff can be explained by the externally forced signal (global SST and SIC changes in our experiments)
A. Gelfan, V. A. Semenov, E. Gusev, Y. Motovilov, O. Nasonova, I. Krylenko, and E. Kovalev Hydrol. Earth Syst. Sci. Discuss., 12, 2305-2348, doi:10.5194/hessd-12-2305-2015, 2015 AbstractDiscussion Paper (PDF, 5223 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
24 Feb 2015
Data assimilation in integrated hydrological modeling using ensemble Kalman filtering: evaluating the effect of ensemble size and localization on filter performance
J. Rasmussen, H. Madsen, K. H. Jensen, and J. C. Refsgaard Hydrol. Earth Syst. Sci. Discuss., 12, 2267-2304, doi:10.5194/hessd-12-2267-2015, 2015 AbstractDiscussion Paper (PDF, 730 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
23 Feb 2015
Spatially shifting temporal points: estimating pooled within-time series variograms for scarce hydrological data
Summary: We developed an alternative method (SSTP) for estimating pooled variograms for geostatistical interpolation of spatially scarce hydrological data. The method relies on the availability of time series and spatializes temporal data by shifting them. We applied SSTP for geostatistical interpolation of a precipitation series in a spatial data-scarce region. SSTP outperforms the available method (AEV) for estimating pooled variograms. We provide an example R script with test data for reproducibility.
Isolating the impacts of land use and climate change on streamflow
Summary: A simple hydrologic modelling based approach to segregate the impacts of land use (LU) and climate change on streamflow is presented. Upper part of Ganga river basin in India is selected as study area for investigation. Results suggest that climate is the dominant contributor to the changes observed in the simulated streamflow. LU did not contribute significantly to the simulated streamflow which could be attributed to smaller spatial extent of sensitive LU categories in the study region.
Inverse modelling of in situ soil water dynamics: accounting for heteroscedastic, autocorrelated, and non-Gaussian distributed residuals
B. Scharnagl, S. C. Iden, W. Durner, H. Vereecken, and M. Herbst Hydrol. Earth Syst. Sci. Discuss., 12, 2155-2199, doi:10.5194/hessd-12-2155-2015, 2015 AbstractDiscussion Paper (PDF, 3225 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
19 Feb 2015
Comparing CFSR and conventional weather data for discharge and sediment loss modelling with SWAT in small catchments in the Ethiopian Highlands
Summary: When using the Soil and Water Assessment Tool (SWAT) for watershed modelling the main input parameters are climate data. The SWAT website suggests using input data from Climate Forecast System Reanalysis (CFSR). We compared CFSR data to measured data and suggest that CFSR data cannot be used unconditionally as it tends to strongly overestimate unimodal rainfall patterns and to underestimate bimodal rainfall patterns. The results allow for specific recommendations concerning rainfall data usage.
Comparing TRMM 3B42, CFSR and ground-based rainfall estimates as input for hydrological models, in data scarce regions: the Upper Blue Nile Basin, Ethiopia
A. W. Worqlul, A. S. Collick, S. A. Tilahun, S. Langan, T. H. M. Rientjes, and T. S. Steenhuis Hydrol. Earth Syst. Sci. Discuss., 12, 2081-2112, doi:10.5194/hessd-12-2081-2015, 2015 AbstractDiscussion Paper (PDF, 3629 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
18 Feb 2015
Quantification of the Beauce's Groundwater contribution to the Loire River discharge using satellite infrared imagery
Summary: This work shows that satellite thermal infrared images (LANDSAT) can be used to locate and quantify groundwater discharge into a large river (Loire River, FRANCE - 100 m to 300 m wide). Groundwater discharge rate is found to be highly variable with time and space and maximum during flow recession periods and in winter. The main identified groundwater discharge area into the Loire River corresponds to a known discharge area of the Beauce aquifer .
E. Lalot, F. Curie, V. Wawrzyniak, S. Schomburgk, H. Piegay, and F. Moatar Hydrol. Earth Syst. Sci. Discuss., 12, 2047-2080, doi:10.5194/hessd-12-2047-2015, 2015 AbstractDiscussion Paper (PDF, 2241 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
16 Feb 2015
Integration of 2-D hydraulic model and high-resolution LiDAR-derived DEM for floodplain flow modeling
D. Shen, J. Wang, X. Cheng, Y. Rui, and S. Ye Hydrol. Earth Syst. Sci. Discuss., 12, 2011-2046, doi:10.5194/hessd-12-2011-2015, 2015 AbstractDiscussion Paper (PDF, 4656 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
13 Feb 2015
Early warning of drought in Europe using the monthly ensemble system from ECMWF
Summary: This paper assesses the predictability of meteorological droughts over Europe one month in advance using Ensemble Prediction Systems.
It has been shown that, in average and using the most relevant method, 40 % of droughts in Europe are correctly forecasted, with less than 25 % of false alarms.
This study is a reference for others studies that are motivated to improve the drought forecasting.
C. Lavaysse, J. Vogt, and F. Pappenberger Hydrol. Earth Syst. Sci. Discuss., 12, 1973-2009, doi:10.5194/hessd-12-1973-2015, 2015 AbstractDiscussion Paper (PDF, 2025 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
13 Feb 2015
Urbanization dramatically altered the water balances of a paddy field dominated basin in Southern China
Summary: The role of evapotranspiration in regulating watershed hydrologic changes is underestimated and the mechanisms linking hydrologic changes to urban heat island (UHI) effects in the humid region are unclear. Highlights:
a) highflows and lowflows increased and evapotranspiration decreased due to urbanization;
b) Urbanization masked climate effects in a rice paddy dominated watershed in altering long term hydrology;
c) Flooding risks and heat island effects expected to rise due to urbanization.
L. Hao, G. Sun, Y. Liu, J. Wan, M. Qin, H. Qian, C. Liu, R. John, P. Fan, and J. Chen Hydrol. Earth Syst. Sci. Discuss., 12, 1941-1972, doi:10.5194/hessd-12-1941-2015, 2015 AbstractDiscussion Paper (PDF, 1031 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
13 Feb 2015
Evaporation in a Mediterranean environment by energy budget and Penman methods, Lake Baratz, Sardinia, Italy
F. Giadrossich, M. Niedda, D. Cohen, and M. Pirastru Hydrol. Earth Syst. Sci. Discuss., 12, 1901-1940, doi:10.5194/hessd-12-1901-2015, 2015 AbstractDiscussion Paper (PDF, 1404 KB)Interactive Discussion (Open, 6 Comments)Manuscript under review for HESS
10 Feb 2015
Singularity-sensitive gauge-based radar rainfall adjustment methods for urban hydrological applications
Summary: A new methodology is proposed in this paper, focusing on improving the applicability of the operational weather radar data to urban hydrology with rain gauge data. The proposed methodology employed a simple yet effective technique to extract additional information (called local singularity structure) from radar data, which was generally ignored in related works. The associated improvement can be particularly seen in capturing storm peak magnitudes, which is critical for urban applications.
Exploring water cycle dynamics through sampling multitude stable water isotope pools in a small developed landscape of Germany
Summary: The two-year weekly to biweekly measurements of δ2H and δ18O in precipitation, stream, soil, and groundwater revealed that surface and groundwater were closely linked but decoupled from the annual rainfall cycle in the Schwingbach catchment. Snowmelt played a fundamental role for groundwater recharge and groundwater predominately controls streamflow. Soil isotopic signatures were affected by land use and seasonality, but approached mean groundwater δ-values with increasing depth.
N. Orlowski, P. Kraft, and L. Breuer Hydrol. Earth Syst. Sci. Discuss., 12, 1809-1853, doi:10.5194/hessd-12-1809-2015, 2015 AbstractDiscussion Paper (PDF, 1741 KB)Interactive Discussion (Open, 3 Comments)Manuscript under review for HESS
06 Feb 2015
5 year radar-based rainfall statistics: disturbances analysis and development of a post-correction scheme for the German radar composite
A. Wagner, J. Seltmann, and H. Kunstmann Hydrol. Earth Syst. Sci. Discuss., 12, 1765-1808, doi:10.5194/hessd-12-1765-2015, 2015 AbstractDiscussion Paper (PDF, 8618 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
06 Feb 2015
Temporal parameter sensitivity guided verification of process dynamics
Summary: To ensure reliable model results, hydrological processes have to be represented adequately in the model structure. We present a framework that uses temporal dynamics of parameter sensitivity to verify the coincidence between modelled and expected hydrological processes in the catchment. The framework is exemplarily applied on a modified groundwater model component. The results show that the behaviour of the groundwater parameters is consistent with the idea behind the structural modifications.
Flood and drought hydrologic monitoring: the role of model parameter uncertainty
Summary: Land surface modeling is playing an increasing role in global monitoring and prediction of extreme hydrologic events. However, uncertainties in parameter identifiability limit the reliability of model predictions. This study makes use of petascale computing to perform a comprehensive evaluation of land surface modeling for global flood and drought monitoring and suggests paths forward to overcome the challenges posed by parameter uncertainty.
N. W. Chaney, J. D. Herman, P. M. Reed, and E. F. Wood Hydrol. Earth Syst. Sci. Discuss., 12, 1697-1728, doi:10.5194/hessd-12-1697-2015, 2015 AbstractDiscussion Paper (PDF, 5070 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
04 Feb 2015
Spatially-distributed influence of agro-environmental factors governing nitrate fate and transport in an irrigated stream-aquifer system
Summary: Nitrate contamination in agricultural groundwater systems is a concern in many regions worldwide. In this study, a model is applied to a regional-scale irrigated stream-aquifer system to identify the system inputs and processes that govern nitrate fate and transport at multiple scales: for the entire study region, for spatial areas irrigated by individual canals, and for individual cultivated fields. Results can be used to guide the localized application of best management practices.
Groundwater flow processes and mixing in active volcanic systems: the case of Guadalajara (Mexico)
Summary: A conceptual model of groundwater flow processes and mixing was developed using a combination of hydrogeochemistry, isotopes and multivariate analysis. The implementation to the case of Guadalajara showed that groundwater was classified into four groups: cold groundwater, hydrothermal water, polluted groundwater and mixed groundwater. The multivariate mixing model (M3) was used to calculate the proportion of different fluids in sampled well water. The result helps authorities in decision making.
A. Hernández-Antonio, J. Mahlknecht, C. Tamez-Meléndez, J. Ramos-Leal, A. Ramírez-Orozco, R. Parra, N. Ornelas-Soto, and C. J. Eastoe Hydrol. Earth Syst. Sci. Discuss., 12, 1599-1631, doi:10.5194/hessd-12-1599-2015, 2015 AbstractDiscussion Paper (PDF, 2844 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
03 Feb 2015
An automated method to build groundwater model hydrostratigraphy from airborne electromagnetic data and lithological borehole logs
P. A. Marker, N. Foged, X. He, A. V. Christiansen, J. C. Refsgaard, E. Auken, and P. Bauer-Gottwein Hydrol. Earth Syst. Sci. Discuss., 12, 1555-1598, doi:10.5194/hessd-12-1555-2015, 2015 AbstractDiscussion Paper (PDF, 4777 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
02 Feb 2015
A 2-D process-based model for suspended sediment dynamics: a first step towards ecological modeling
Summary: • A 2-D process-based model reproduces measured suspended sediment concentration in a complex estuarine environment.
• Model results cover range from tidal to seasonal variations in sediment dynamics.
• Model produces yearly sediment budget and spatial deposition patterns.
• Translating SSC into turbidity allows ecologists to profit from model results of sediment dynamics.
• Sediment budget modeling can be done applying single sediment fraction and little information of bottom composition
F. M. Achete, M. van der Wegen, D. Roelvink, and B. Jaffe Hydrol. Earth Syst. Sci. Discuss., 12, 1507-1553, doi:10.5194/hessd-12-1507-2015, 2015 AbstractDiscussion Paper (PDF, 8183 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
02 Feb 2015
Projected changes in US erosivity
Summary: We estimate future changes in US erosivity from the most recent ensemble projections of daily and monthly rainfall accumulation. The expectation of overall increase in erosivity is confirmed by these calculations, but a quantitative assessment is marred by large uncertainties. Specifically, the uncertainty in the method of estimation of erosivity is more consequential than that deriving from the spread in climate simulations, and leads to changes of uncertain sign in parts of the South.
Flooding in river mouths: human caused or natural events? Five centuries of flooding events in the SW Netherlands, 1500–2000
Summary: natural floodings caused by storm floods also have important human components determining how disastrous they could be
Man-made floodings during warfare were only successful is natural conditions and factors were fully used.
Strategic floodings during the 16th-17th century dramatically changed landscapes, from which valuebale lessons were learnt to perfect this strategic in the 18th and 19th centuries.
Assessment of Halon-1301 as a groundwater age tracer
Summary: We assess the potential of Halon-1301 as a new groundwater age tracer, which had not been assessed in detail. We determine Halon-1301 and infer age in 17 New Zealand groundwater and various modern waters. Halon-1301 reliably inferred age in 71% of the sites within +/- 2 years of the ages inferred from tritium and SF6. The remaining (anoxic) waters show reduced concentrations of Halon-1301 along with even further reduced concentrations of CFCs. The reason(s) for this need to be further assessed.
A topological restricted maximum likelihood (TopREML) approach to regionalize trended runoff signatures in stream networks
Summary: We introduce TopREML as a method to predict runoff signatures in ungauged basins using linear mixed models with spatially correlated random effects. The nested nature of streamflow networks is accounted for by allowing for stronger correlations between flow-connected basins. The restricted maximum likelihood framework provides best linear unbiased predictions of both the predicted flow variable and its uncertainty as shown in Monte Carlo and cross validation analyses in Nepal and Austria.
SACRA – global data sets of satellite-derived crop calendars for agricultural simulations: an estimation of a high-resolution crop calendar using satellite-sensed NDVI
Summary: This study aims to develop a new global data set of a satellite-derived crop calendar (CC) and reveal its advantages and disadvantages compared to other global products. Estimated global CC shows similar spatial pattern in planting date over many regions compared to a census-based product. Our product has an advantage in providing not only planting/harvesting dates but also a peak date from the time series of NDVI data.
Technical Note: Semi-automated classification of time-lapse RGB imagery for a remote Greenlandic river
Summary: Here, we give a semi-automated processing workflow to extract hydraulic parameters from over 10,000 time-lapse images of the remote Isortoq River in Greenland. This workflow allows efficient and accurate (mean accuracy 79.6%)classification of images following an automated similarity filtering process. We also show an effective width hydrograph (a proxy for discharge) for the Isortoq using this workflow, showing the potential of this workflow for enhancing understanding of remote rivers.
C. J. Gleason, L. C. Smith, D. C. Finnegan, A. L. LeWinter, L. H. Pitcher, and V. W. Chu Hydrol. Earth Syst. Sci. Discuss., 12, 1311-1327, doi:10.5194/hessd-12-1311-2015, 2015 AbstractDiscussion Paper (PDF, 652 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
29 Jan 2015
Using high frequency water quality data to assess sampling strategies for the EU Water Framework Directive
Summary: The EU Water Framework Directive requires rivers to be of good chemical and ecological quality. Chemical quality is assessed by sampling and analysing the water. Normal sampling regimes might involve taking a sample monthly or weekly. This paper uses high frequency data from rivers to assess how accurate these regimes are at assessing the true chemical quality. Weekly sampling was more accurate than monthly, but there were still large uncertainties. We suggest ways to improve sampling accuracy.
Coupled local facilitation and global hydrologic inhibition drive landscape geometry in a patterned peatland
S. Acharya, D. A. Kaplan, S. Casey, M. J. Cohen, and J. W. Jawitz Hydrol. Earth Syst. Sci. Discuss., 12, 1247-1277, doi:10.5194/hessd-12-1247-2015, 2015 AbstractDiscussion Paper (PDF, 3171 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
28 Jan 2015
High-quality observation of surface imperviousness for urban runoff modelling using UAV imagery
Summary: We investigate for the first time the possibility to derive high-resolution imperviousness maps for urban areas from UAV imagery and to use this information as input for urban drainage models. We show that imperviousness maps generated using UAV imagery processed with modern classification methods achieve accuracy comparable with standard, off-the-shelf aerial imagery. We conclude that UAV imagery represents a valuable alternative data source for urban drainage model applications.
P. Tokarczyk, J. P. Leitao, J. Rieckermann, K. Schindler, and F. Blumensaat Hydrol. Earth Syst. Sci. Discuss., 12, 1205-1245, doi:10.5194/hessd-12-1205-2015, 2015 AbstractDiscussion Paper (PDF, 4513 KB)Supplement (391 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
27 Jan 2015
Evolution of hydrological sciences from dimensions of object, discipline and methodology
Summary: The evolution routes and development stages in hydrological sciences are summarised from the following three dimensions: research object, discipline and methodology, by means of the descriptive-explanatory-humanistic ideology.
The 3-dimensional diagram of evolution routes of hydrological sciences may provide some ideas for Panta Rhei, the new IAHS Science Initiative 2013-2022 for hydrological research under changing human and environmental systems in the real world.
Role of vegetation and landcover dynamics on the recycling of water in two endorheic watersheds of NW China (Gansu Province)
Summary: This paper describes a methodology in analysing the interdependencies between components of the hydrological cycle and vegetation characteristic at different elevation zones of two endorheic watersheds in an arid-mountainous region of NW China. The analysis shows that oasis vegetation has an important function in sustaining the water cycle in the watersheds and oasis vegetation is dependent on surface and shallow subsurface water flow from mountain sources.
M. A. Matin and C. P.-A. Bourque Hydrol. Earth Syst. Sci. Discuss., 12, 1153-1188, doi:10.5194/hessd-12-1153-2015, 2015 AbstractDiscussion Paper (PDF, 1712 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
26 Jan 2015
Global warming increases the frequency of river floods in Europe
Summary: • This work presents, to our best knowledge, the first pan-European assessment of the future hydro-meteorological hazard based on an ensemble of the new EURO-CORDEX regional climate scenarios.
• We propose a novel approach, which shows how the change in the frequency of future floods in Europe is likely to have a larger impact on the overall flood hazard as compared to the change in their magnitude.
• A consistent method is proposed to evaluate the agreement of ensemble projections.
How effective is river restoration in re-establishing groundwater – surface water interactions? – A case study
Summary: This study investigates the effects of river restoration on groundwater-surface water interactions in a losing urban stream. Investigations were performed with Distributed Temperature Sensing (DTS). The results indicate that the highest surface water downwelling occurred at the tip of a gravel island newly installed during river restoration, leading to the conclusion that in this specific setting river restoration was effective in locally enhancing groundwater-surface water interactions.
A.-M. Kurth, C. Weber, and M. Schirmer Hydrol. Earth Syst. Sci. Discuss., 12, 1093-1118, doi:10.5194/hessd-12-1093-2015, 2015 AbstractDiscussion Paper (PDF, 8281 KB)Interactive Discussion (Open, 10 Comments)Manuscript under review for HESS
23 Jan 2015
Evolution of the human–water relationships in Heihe River basin in the past 2000 years
Summary: This paper quantitatively analyzed the evolution of human-water relationships in the Heihe River basin over the past 2000 years by reconstructing the catchment water balance. The results provided the basis for investigating the impacts of human societies on hydrological systems. The evolutionary processes of human-water relationships can be divided into four stages: predevelopment, take-off, acceleration, and rebalancing. And the transition of the human-water relationship had no fixed pattern.
Laser vision: lidar as a transformative tool to advance critical zone science
Summary: This review's objective is to demonstrate the transformative potential of lidar by critically assessing both challenges and opportunities for transdisciplinary lidar applications in geomorphology, hydrology, and ecology. We find that using lidar to its full potential will require numerous advances, including more powerful open-source processing tools, new lidar acquisition technologies, and improved integration with physically-based models and complementary observations.
A. A. Harpold, J. A. Marshall, S. W. Lyon, T. B. Barnhart, B. Fisher, M. Donovan, K. M. Brubaker, C. J. Crosby, N. F. Glenn, C. L. Glennie, P. B. Kirchner, N. Lam, K. D. Mankoff, J. L. McCreight, N. P. Molotch, K. N. Musselman, J. Pelletier, T. Russo, H. Sangireddy, Y. Sjöberg, T. Swetnam, and N. West Hydrol. Earth Syst. Sci. Discuss., 12, 1017-1058, doi:10.5194/hessd-12-1017-2015, 2015 AbstractDiscussion Paper (PDF, 787 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
23 Jan 2015
Understanding runoff processes in a semi-arid environment through isotope and hydrochemical hydrograph separations
Summary: Isotope and hydrochemical tracers are tested providing new insights to isotope hydrograph in semi-arid areas in Southern Africa. This study provides a spatial hydrochemical characterization of surface and groundwater sources, end member mixing analysis, and two and three component hydrograph separations. Results showed that the Kaap catchment is mainly dominated by groundwater sources, and direct runoff is positively correlated to the antecedent precipitation index during the wet season.
V. V. Camacho, A. M. L Saraiva Okello, J. W. Wenninger, and S. Uhlenbrook Hydrol. Earth Syst. Sci. Discuss., 12, 975-1015, doi:10.5194/hessd-12-975-2015, 2015 AbstractDiscussion Paper (PDF, 3270 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
22 Jan 2015
Effects of snow ratio on annual runoff within Budyko framework
Summary: 1.Catchments with higher snow ratio tend to have larger runoff index.
2.A modified Budyko method is proposed to describe snow effects.
3.Snow ratio change has significant contribution to runoff change, according to historical observations and projected future climate scenarios, especially in northwest mountainous and north high-latitude areas of china.
Climate response to Amazon forest replacement by heterogeneous crop cover
Summary: This study expands upon previous Amazon deforestation modeling studies by using realistic heterogeneous crop cover as replacement vegetation and diagnoses the changes in land-atmosphere coupling due to land-use change. With the use of an interactive crop model, the impact that irrigation has on land-atmosphere coupling when using crops as a replacement vegetation has been analyzed. This study also provides documentation on the development of tropical crops for CLM4.5
Impacts of beaver dams on hydrologic and temperature regimes in a mountain stream
Summary: This study quantifies the impacts of beaver on hydrologic and temperature regimes, as well as highlights the importance of understanding the spatial and temporal scales of those impacts.
Reach scale discharge showed shift from losing to gaining. Temperature increased by 0.38°C (3.8%) and mean residence time by 230%. At the sub-reach scale, discharge gains and losses increased in variability. At the beaver dam scale, we observed increase in thermal heterogeneity with warmer and cooler niches.
M. Majerova, B. T. Neilson, N. M. Schmadel, J. M. Wheaton, and C. J. Snow Hydrol. Earth Syst. Sci. Discuss., 12, 839-878, doi:10.5194/hessd-12-839-2015, 2015 AbstractDiscussion Paper (PDF, 4774 KB)Supplement (6107 KB)Interactive Discussion (Open, 3 Comments)Manuscript under review for HESS
22 Jan 2015
GlobWat – a global water balance model to assess water use in irrigated agriculture
Summary: GlobWat is a freely distributed, global soil water balance model that is used by FAO to assess water use in irrigated agriculture; the main factor behind scarcity of freshwater in an increasing number of regions. The model is based on spatially distributed high resolution datasets that are consistent at global level and is calibrated and validated against information published in global databases. The paper describes methodology, input and output data, calibration and validation of the model.
J. Hoogeveen, J.-M. Faurès, L. Peiser, J. Burke, and N. van de Giesen Hydrol. Earth Syst. Sci. Discuss., 12, 801-838, doi:10.5194/hessd-12-801-2015, 2015 AbstractDiscussion Paper (PDF, 3283 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
20 Jan 2015
Definition of efficient scarcity-based water pricing policies through stochastic programming
Summary: One of the most promising alternatives to improve the efficiency in water usage is the implementation of scarcity-based pricing policies, based on the opportunity cost of water at the basin scale. Time series of the marginal value of water at selected locations (reservoirs) are obtained using a stochastic hydro-economic model and then post-processed to define step water pricing policies.
H. Macian-Sorribes, M. Pulido-Velazquez, and A. Tilmant Hydrol. Earth Syst. Sci. Discuss., 12, 771-799, doi:10.5194/hessd-12-771-2015, 2015 AbstractDiscussion Paper (PDF, 1076 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
19 Jan 2015
Revised predictive equations for salt intrusion modelling in estuaries
Summary: We revised the predictive equations for two calibrated parameters in salt intrusion model (the Van der Burgh coefficient K and dispersion coefficient D) using an extended database of 89 salinity profiles including 8 newly conducted salinity measurements. The revised predictive equations consist of easily measured parameters such as the geometry of estuary, tide, friction and the Richardson Number. These equations are useful in obtaining the first estimate of salinity distribution in an estuary.
Inter-annual variability of dissolved inorganic nitrogen in the Biobío River, Central Chile: an analysis base on a decadal database along with 1-D reactive transport modeling
Summary: This study examines the inter-annual variability of dissolved inorganic nitrogen (DIN) seasonal cycle for the Biobío River in Central Chile. Historical water flow and water quality datasets were used along with a one-dimensional reactive transport ecosystem model to evaluate the effects of water flow and N inputs on seasonal pattern of DIN. Results showed that high DIN production occurred during wet years, whereas high consumption proceeded during dry years. Nitrification was identified as one o
M. Yévenes, R. Figueroa, O. Parra, and L. Farías Hydrol. Earth Syst. Sci. Discuss., 12, 705-738, doi:10.5194/hessd-12-705-2015, 2015 AbstractDiscussion Paper (PDF, 3351 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
16 Jan 2015
Precipitation in the Amazon and its relationship with moisture transport and tropical Pacific and Atlantic SST from the CMIP5 simulation
Summary: Studies on numerical modeling in Amazonia show that the models fail to capture important aspects of climate variability in this region and it is important to understand the reasons that cause this drawback. We study how the general circulation models of the CMIP5 simulate the inter-relations between regional precipitation, moisture convergence and SST in the adjacent oceans, to assess how flaws in the representation of these processes can translate into biases in simulated rainfall in Amazonia.
A conceptual, distributed snow redistribution model
Summary: Temperature index melt models often lead to snow accumulation in high mountainous elevations. We developed a simple conceptual snow redistribution model working on a commonly used grid cell size of 1x1 km. That model is integrated in the hydrological rainfall runoff model COSERO. Applying the model to the catchment of Oetztaler Ache, Austria, could prevent the accumulation of snow in the upper altitudes and lead to an improved model efficiency regarding discharge and snow coverage (MODIS).
High-resolution estimation of the water balance components from high-precision lysimeters
M. Hannes, U. Wollschläger, F. Schrader, W. Durner, S. Gebler, T. Pütz, J. Fank, G. von Unold, and H.-J. Vogel Hydrol. Earth Syst. Sci. Discuss., 12, 569-608, doi:10.5194/hessd-12-569-2015, 2015 AbstractDiscussion Paper (PDF, 6809 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
14 Jan 2015
Flood frequency analysis of historical flood data under stationary and non-stationary modelling
Summary: A flood frequency analysis using a 400 year historical flood record was carried out using a stationary model (based on maximum likelihood estimators) and a non-stationary model that incorporates external covariates (climatic and environmental. The stationary model was successful on providing an average discharge around which value flood quantiles estimated by non-stationary models fluctuate through time.
H. Vernieuwe, S. Vandenberghe, B. De Baets, and N. E. C. Verhoest Hydrol. Earth Syst. Sci. Discuss., 12, 489-524, doi:10.5194/hessd-12-489-2015, 2015 AbstractDiscussion Paper (PDF, 1330 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
14 Jan 2015
Inverse isolation of dissolved inorganic nitrogen yield for individual land-uses from mosaic land-use patterns within a watershed
Summary: This study combines the observed riverine DIN (dissolved inorganic nitrogen) export and the controlling factors (land-use, population and discharge) to inversely estimate the effective DIN yield factors for individual land-use and per capita loading. Those estimated DIN yield factors can extrapolate all possible combinations of land-use, discharge, and population density, demonstrating the capability for scenario assessment.
Y.-T. Shih, T.-Y. Lee, J.-C. Huang, S.-J. Kao, K.-K. Liu, and F.-J. Chang Hydrol. Earth Syst. Sci. Discuss., 12, 449-487, doi:10.5194/hessd-12-449-2015, 2015 AbstractDiscussion Paper (PDF, 4772 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
13 Jan 2015
How to predict hydrological effects of local land use change: how the vegetation parameterisation for short rotation coppices influences model results
Summary: Predicting hydrological effects of land use change, e.g. enhanced cultivation of short rotation coppices, requires an adequate parameterization. Measurements and modelling results show that leaf area index, stomatal resistance and in particular start and length of growing season are most sensitive to soil hydrological quantities, like ground water recharge (GWR). Only simulations over 30 years, reflecting long term climate variability, show even zero GWR, especially in succeeding dry years.
F. Richter, C. Döring, M. Jansen, O. Panferov, U. Spank, and C. Bernhofer Hydrol. Earth Syst. Sci. Discuss., 12, 405-448, doi:10.5194/hessd-12-405-2015, 2015 AbstractDiscussion Paper (PDF, 511 KB)Supplement (297 KB)Interactive Discussion (Open, 3 Comments)Manuscript under review for HESS
13 Jan 2015
Water vapor mapping by fusing InSAR and GNSS remote sensing data and atmospheric simulations
Summary: This work aims at deriving high spatially-resolved maps of atmospheric water vapor by the fusion data from Interferometric Synthetic Aperture Radar (InSAR), Global Navigation Satellite Systems (GNSS), and the Weather Research and Forecasting (WRF) model. The data fusion approach exploits the redundant as well as complementary spatial properties of all data sets to provide more accurate and high-resolution maps of water vapor. The comparison with maps from MERIS shows RMS values of less than 1 mm
F. Alshawaf, B. Fersch, S. Hinz, H. Kunstmann, M. Mayer, and F. J. Meyer Hydrol. Earth Syst. Sci. Discuss., 12, 363-404, doi:10.5194/hessd-12-363-2015, 2015 AbstractDiscussion Paper (PDF, 4453 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
12 Jan 2015
Building long-term and high spatio-temporal resolution precipitation and air temperature reanalyses by mixing local observations and global atmospheric reanalyses: the ANATEM method
A. Kuentz, T. Mathevet, J. Gailhard, and B. Hingray Hydrol. Earth Syst. Sci. Discuss., 12, 311-361, doi:10.5194/hessd-12-311-2015, 2015 AbstractDiscussion Paper (PDF, 9050 KB)Interactive Discussion (Open, 7 Comments)Manuscript under review for HESS
12 Jan 2015
Evaluation of precipitation extremes and floods and comparison between their temporal distributions
Summary: We proposed three analogous indices that enable to evaluate and to compare the extremity of precipitation events and floods. Precipitation extremes are considered both regardless and regarding of the season. We present sets of extremes from the period of 1961–2010 in the Czech Republic and demonstrate the fact that the temporal distributions of them are not identical. It shows that not only changes in precipitation extremity but also in their seasonality could produce changes in flood extremity.
M. Müller, M. Kašpar, A. Valeriánová, L. Crhová, and E. Holtanová Hydrol. Earth Syst. Sci. Discuss., 12, 281-310, doi:10.5194/hessd-12-281-2015, 2015 AbstractDiscussion Paper (PDF, 2044 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
09 Jan 2015
Hydrologic calibration of paired watersheds using a MOSUM approach
H. Ssegane, D. M. Amatya, A. Muwamba, G. M. Chescheir, T. Appelboom, E. W. Tollner, J. E. Nettles, M. A. Youssef, F. Birgand, and R. W. Skaggs Hydrol. Earth Syst. Sci. Discuss., 12, 245-279, doi:10.5194/hessd-12-245-2015, 2015 AbstractDiscussion Paper (PDF, 2074 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
09 Jan 2015
Analyses of uncertainties and scaling of groundwater level fluctuations
Summary: The error or uncertainty in head, obtained with an analytical or numerical solution, in early time is mainly caused by the random initial condition and the error reduces as time goes to reach a constant error in later time. The constant error in later time is mainly due to the effects of the uncertain source/sink. The error caused by the uncertain boundary is limited in a narrow zone. Temporal scaling of head exists in most part of a low permeable aquifer mainly caused by recharge fluctuation.
Complex networks, streamflow, and hydrometric monitoring system design
M. Halverson and S. Fleming Hydrol. Earth Syst. Sci. Discuss., 11, 13663-13710, doi:10.5194/hessd-11-13663-2014, 2014 AbstractDiscussion Paper (PDF, 2442 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
15 Dec 2014
Extending periodic eddy covariance latent heat fluxes through tree sapflow measurements to estimate long-term total evaporation in a peat swamp forest
Summary: The 3rd paper in a series dealing with evaporation over indigenous vegetation in an area of South Africa experiencing severe water challenges. The area is a World Heritage site and an important conservation area in which our understanding of the water-balance plays a crucial role in system management.
We provide the fist estimates of total evaporation from a subtropical peat swamp forest, investigate measurement techniques and provide modelling solutions to estimate long-term evaporation.
A. D. Clulow, C. S. Everson, M. G. Mengistu, J. S. Price, A. Nickless, and G. P. W. Jewitt Hydrol. Earth Syst. Sci. Discuss., 11, 13607-13661, doi:10.5194/hessd-11-13607-2014, 2014 AbstractDiscussion Paper (PDF, 2412 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
12 Dec 2014
Surface seiches in Flathead Lake
G. Kirillin, M. S. Lorang, T. C. Lippmann, C. C. Gotschalk, and S. Schimmelpfennig Hydrol. Earth Syst. Sci. Discuss., 11, 13541-13570, doi:10.5194/hessd-11-13541-2014, 2014 AbstractDiscussion Paper (PDF, 2592 KB)Supplement (6600 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
10 Dec 2014
Analysis of frequency and duration of the functional periods on the basis of long-term variability of limnetic processes within the Bug River valley
The effective porosity and grain size relations in permeability functions
K. Urumović and K. Urumović Sr. Hydrol. Earth Syst. Sci. Discuss., 11, 6675-6714, doi:10.5194/hessd-11-6675-2014, 2014 AbstractDiscussion Paper (PDF, 4609 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS