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.
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, 2015 AbstractDiscussion Paper (PDF, 787 KB)Interactive Discussion (Open, 0 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, 2015 AbstractDiscussion Paper (PDF, 3270 KB)Interactive Discussion (Open, 0 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.
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, 2015 AbstractDiscussion Paper (PDF, 3283 KB)Interactive Discussion (Open, 0 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.
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
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, 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, 2015 AbstractDiscussion Paper (PDF, 1330 KB)Interactive Discussion (Open, 1 Comment)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, 2015 AbstractDiscussion Paper (PDF, 4772 KB)Interactive Discussion (Open, 0 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.
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, 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
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, 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, 2015 AbstractDiscussion Paper (PDF, 2074 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
09 Jan 2015
Biotic controls on solute distribution and transport in headwater catchments
Summary: Solute concentrations in headwater streams vary with discharge due to changing flow paths through the catchment during precipitation events. A comparison of stream chemistry across three headwater catchments reveals that solute heterogeneity across each landscape controls how different solutes respond to increasing discharge. Solute heterogeneity is at least partially controlled by landscape distributions of vegetation and soil organic matter.
Interacting effects of climate and agriculture on fluvial DOM in temperate and subtropical catchments
D. Graeber, G. Goyenola, M. Meerhoff, E. Zwirnmann, N. B. Ovesen, M. Glendell, J. Gelbrecht, F. Teixeira de Mello, I. González-Bergonzoni, E. Jeppesen, and B. Kronvang Hydrol. Earth Syst. Sci. Discuss., 12, 135-175, 2015 AbstractDiscussion Paper (PDF, 738 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESSSpecial Issue
07 Jan 2015
Quantifying the nutrient flux within a lowland karstic catchment
Summary: In this study, the nutrient flux occurring within the surface and groundwaters of a lowland karst catchment in western Ireland was investigated with the aid of alkalinity sampling and a hydrological model. Results indicated that while the system is primarily river fed (allogenic), karst derived recharge (autogenic) adds approximately 85% to the total N-load. Results also suggested that nutrient loss processes were occurring within the system during flooded/wet periods.
Technical Note: The use of an interrupted-flow centrifugation method to characterise preferential flow in low permeability media
Summary: We present an interrupted flow centrifugation technique to characterise the vertical hydraulic properties of dual porosity, low permeability media. Use of large core samples (100 mm diameter) enables hydraulic conductivity scale issues in dual porosity media to be overcome. Elevated centrifugal force also enables simulation of in situ total stress conditions. The methodology is an important tool to assess the ability of dual porosity aquitards to protect underlying aquifer systems.
Why is the Arkavathy River drying? A multiple hypothesis approach in a data scarce region
Summary: The paper asks why the Arkavathy River in South India is drying.
The study results indicate that anthropogenic drivers like groundwater pumping, eucalyptus plantations and channel fragmentation, are much more likely to have caused the decline than changing climate.
The multiple working hypotheses approach presents a systematic way to quantify the relative contributions of different drivers.
The approach contributes to the policy debate and also helps prioritize new scientific research.
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.
Influence of solar forcing, climate variability and atmospheric circulation patterns on summer floods in Switzerland
Summary: The paper presents an index of summer flood damage in Switzerland from 1800 to 2009 and explores the influence of solar forcing, climate variability and low-frequency atmospheric circulation on flood frequencies. The flood damage index provides evidence that the 1817-1851, 1881-1927, 1977-1990 and 2005-present flood clusters are mostly in phase with palaeoclimate proxies and solar activity minima. Floods are influenced by atmospheric instability related to the Summer North Atlantic Oscillation.
Actual evapotranspiration and precipitation measured by lysimeters: a comparison with eddy covariance and tipping bucket
S. Gebler, H.-J. Hendricks Franssen, T. Pütz, H. Post, M. Schmidt, and H. Vereecken Hydrol. Earth Syst. Sci. Discuss., 11, 13797-13841, 2014 AbstractDiscussion Paper (PDF, 4271 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
17 Dec 2014
Exploring the impact of forcing error characteristics on physically based snow simulations within a global sensitivity analysis framework
Summary: Sensitivity analysis is used to examine how error characteristics (type, distributions, and magnitudes) in meteorological forcing data impact four outputs from a physics-based snow model in four climates. Bias and error magnitudes were key factors in model sensitivity, and precipitation bias often dominated. However, the relative importance of forcings depended somewhat on the selected model output. The forcing uncertainty found here exceeded model selection uncertainty found in other studies.
Dye tracing for investigating flow and transport properties of hydrocarbon-polluted Rabots glaciär, Kebnekaise, Sweden
C. C. Clason, C. Coch, J. Jarsjö, K. Brugger, P. Jansson, and G. Rosqvist Hydrol. Earth Syst. Sci. Discuss., 11, 13711-13744, 2014 AbstractDiscussion Paper (PDF, 2836 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
15 Dec 2014
Complex networks, streamflow, and hydrometric monitoring system design
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, 2014 AbstractDiscussion Paper (PDF, 2412 KB)Interactive Discussion (Open, 0 Comments)Manuscript under review for HESS
12 Dec 2014
Effects of vegetation change on evapotranspiration in a semiarid shrubland of the Loess Plateau, China
Evaluation of an extreme-condition-inverse calibration remote sensing model for mapping energy balance fluxes in arid riparian areas
S.-H. Hong, J. M. H. Hendrickx, J. Kleissl, R. G. Allen, W. G. M. Bastiaanssen, R. L. Scott, and A. L. Steinwand Hydrol. Earth Syst. Sci. Discuss., 11, 13479-13539, 2014 AbstractDiscussion Paper (PDF, 2739 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
10 Dec 2014
Virtual laboratories: new opportunities for collaborative water science
Summary: We present the outcomes of a collaborative hydrological experiment undertaken by five different international research groups in a virtual laboratory. Moving from the definition of accurate protocols, a rainfall-runoff model was independently applied by the research groups, which then engaged in a comparative discussion. The results revealed that sharing protocols and running the experiment within a controlled environment is fundamental for ensuring experiment repeatability and reproducibility.
S. Ceola, B. Arheimer, G. Blöschl, E. Baratti, R. Capell, A. Castellarin, J. Freer, D. Han, M. Hrachowitz, Y. Hundecha, C. Hutton, G. Lindström, A. Montanari, R. Nijzink, J. Parajka, E. Toth, A. Viglione, and T. Wagener Hydrol. Earth Syst. Sci. Discuss., 11, 13443-13478, 2014 AbstractDiscussion Paper (PDF, 3418 KB)Supplement (98 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
10 Dec 2014
Diagnostic calibration of a hydrological model in an alpine area by hydrograph partitioning
Monitoring and modelling of soil–plant interactions: the joint use of ERT, sap flow and Eddy Covariance data to characterize the volume of an orange tree root zone
Summary: The paper presents an integrated approach to monitoring root water uptake and link this information to the plant transpiration measured by sap flow and eddy covariance. The monitoring of soil conditions is achieved using 3-D electrical resistivity tomography. This ensemble of data can be used jointly to model the soil-plant interactions and identify the extent and efficiency of the root zone in front of existing irrigation schemes. A case study is presented regarding an orange orchard in Sicily.
G. Cassiani, J. Boaga, D. Vanella, M. T. Perri, and S. Consoli Hydrol. Earth Syst. Sci. Discuss., 11, 13353-13384, 2014 AbstractDiscussion Paper (PDF, 21091 KB)Interactive Discussion (Open, 6 Comments)Manuscript under review for HESS
08 Dec 2014
Notes on the estimation of resistance to flow during flood wave propagation
Summary: The paper discusses the evaluation of resistance in unsteady flow, which still poses a challenge. It is shown that physically based variables such as friction velocity are better indicators of resistance variability during flood wave propagation than empirical coefficients, such as the Manning coefficient, which were originally derived for steady flow conditions. Theoretical description is facilitated with the analysis of field data from artificial dam-break flood waves in a small lowland river.
From runoff to rainfall: inverse rainfall–runoff modelling in a high temporal resolution
Summary: Especially in alpine catchments, areal rainfall estimates often exhibit large errors. Runoff measurements are on the other hand one of the most robust observations within the hydrological cycle. We therefore calculate mean catchment rainfall by inverting a HBV-type rainfall-runoff model, using runoff observations as input. The inverse model can e.g. be used to analyse the rainfall conditions of extreme flood events.
A global dataset of the extent of irrigated land from 1900 to 2005
Summary: We developed the Historical Irrigation Dataset (HID) depicting the temporal development of the area equipped for irrigation (AEI) between 1900 and 2005 at 5 arc-minute resolution.
The HID reflects very well the spatial patterns of irrigated land in the western USA as shown on historical maps.
Global AEI increased from 63 million ha (Mha) in 1900 to 112 Mha in 1950 and 306 Mha in 2005. Mean aridity on irrigated land increased and mean natural river discharge decreased from 1900–1950.
Testing gridded land precipitation data and precipitation and runoff reanalyses (1982–2010) between 45° S and 45° N with Normalized Difference Vegetation Index data
Summary: The study evaluates annual precipitation (largely rainfall) amounts for the tropics and subtropics; precipitation amounts were obtained from ground observations, satellite observations and numerical weather forecasting models.
- annual precipitation amounts from ground and satellite observations were the most realistic
- newer weather forecasting models better predicted annual precipitation than an older model
- weather forecasting models predicted inaccurate precipitation amounts for Africa
Assessing downstream flood impacts due to a potential GLOF from Imja Lake in Nepal
Summary: The potential flooding impacts from Imja glacial lake in Nepal were studied using a two-dimensional debris flow model to evaluate the effectiveness of proposed measures to reduce possible flooding impacts to downstream communities by lowering the lake level. The results indicate that only minor benefits is achieved with modest (~3 m) lowering and lowering of 20 m almost eliminates all flood impact at Dingboche.
M. A. Somos-Valenzuela, D. C. McKinney, A. C. Byers, D. R. Rounce, C. Portocarrero, and D. Lamsal Hydrol. Earth Syst. Sci. Discuss., 11, 13019-13053, 2014 AbstractDiscussion Paper (PDF, 4478 KB)Interactive Discussion (Open, 2 Comments)Manuscript under review for HESS
25 Nov 2014
The water balance components of undisturbed tropical woodlands in the Brazilian Cerrado
Summary: We determined the main components of the water balance for an undisturbed dense cerrado.
Evapotranspiration (ET) ranged from 1.91 to 2.60 mm d-1 for the dry and wet season, respectively. Canopy interception ranged from 4 to 20% and stemflow values were approximately 1% of gross precipitation.
The average runoff coefficient was less than 1%, while Cerrado deforestation has the potential to increase that amount up to 20 fold.
The water storage may be estimated by the difference between P and ET.
P. T. S. Oliveira, E. Wendland, M. A. Nearing, R. L. Scott, R. Rosolem, and H. R. da Rocha Hydrol. Earth Syst. Sci. Discuss., 11, 12987-13018, 2014 AbstractDiscussion Paper (PDF, 2971 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
21 Nov 2014
Multi-annual droughts in the English Lowlands: a review of their characteristics and climate drivers in the winter half year
Summary: The English Lowlands is a heavily populated, water stressed region, which is vulnerable to long droughts typically associated with dry winters. We conduct a long-term (1910 - present) quantitative analysis of precipitation, flow and groundwater droughts for the region, and then review potential climatic drivers. No single driver is dominant but we demonstrate, for the first time, a physical link between La Nina conditions and winter rainfall, associated with long droughts in the region.
C. K. Folland, J. Hannaford, J. P. Bloomfield, M. Kendon, C. Svensson, B. P. Marchant, J. Prior, and E. Wallace Hydrol. Earth Syst. Sci. Discuss., 11, 12933-12985, 2014 AbstractDiscussion Paper (PDF, 8573 KB)Supplement (590 KB)Interactive Discussion (Open, 5 Comments)Manuscript under review for HESS
21 Nov 2014
Topographic controls on soil moisture scaling properties in polygonal ground using idealized high-resolution surface–subsurface simulations
Investigation of variable threshold level approaches for hydrological drought identification
Summary: This paper explores possible threshold level calculation methods for hydrological drought analysis. We proposed four threshold methods applied to time series of hydrometeorological variables and inter-compared the drought propagation patterns. Our results have shown that these methods can influence the magnitude and severity of droughts differently and even may introduce artefact drought events. Therefore, we suggest the use and checking of these threshold approaches for drought analysis.
B. S. Beyene, A. F. Van Loon, H. A. J. Van Lanen, and P. J. J. F. Torfs Hydrol. Earth Syst. Sci. Discuss., 11, 12765-12797, 2014 AbstractDiscussion Paper (PDF, 991 KB)Interactive Discussion (Open, 1 Comment)Manuscript under review for HESS
17 Nov 2014
Characterization of sediment layer composition in a shallow lake: from open water zones to reed belt areas
Improving inflow forecasting into hydropower reservoirs through a complementary modelling framework
Summary: We present a forecasting system comprising additively setup conceptual and simple error model. Parameters of the conceptual model were left unaltered, as are in most operational setups, and the data-driven model was arranged to forecast the corrective measures the conceptual model needs. We demonstrate that the present procedure could effectively improve forecast accuracy over extended lead-times and the probabilistic forecasts satisfy reliability requirements for lead-times up to 17 hours.