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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2017-396
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
12 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).
The sub-annual calibration of hydrological models considering climatic intra-annual variations
Binru Zhao1,2, Huichao Dai1, Dawei Han2, and Guiwen Rong3 1College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China
2Water and Environmental Management Research Centre, Department of Civil Engineering, University of Bristol, Bristol, BS81TR, UK
3College of Earth and Environment, Anhui University of Science and Technology, Huainan, 232001, China
Abstract. Changing climate leads to change of temporal dynamics of hydrological systems by affecting the catchment conditions. Considering climatic variations when calibrating a hydrological model can improve model performance, which allows parameter sets to vary according to sub-periods with different climate conditions. This study has explored climatic intra-annual variations by using two classification approaches to recognize the sub-periods with similar climatic patterns, Calendar-Based Grouping (CBG) method and Fuzzy C-Means (FCM) algorithm. The model performances of the sub-annual calibration schemes based on these two approaches are compared using the conceptual model IHACRES. The effect of time scales on sub-annual calibration schemes was also studied. Results indicate that the sub-annual calibration scheme based on CBG method performs better than that based on Rainfall-dominated FCM algorithm, since the CBG method has a better performance in recognizing temperature pattern, and the main source of catchment change is from the change of vegetation, which is mainly affected by temperature in the study site. The optimal time scale is dependent on the sub-annual calibration scheme, with bimonthly for CBG method and Temperature-dominated FCM algorithm and seasonal for Rainfall-dominated FCM algorithm. Overall, when using sub-annual calibration schemes, the selection of the partitioning method and time scale is very important to model performances

Citation: Zhao, B., Dai, H., Han, D., and Rong, G.: The sub-annual calibration of hydrological models considering climatic intra-annual variations, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-396, in review, 2017.
Binru Zhao et al.
Binru Zhao et al.
Binru Zhao et al.

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Short summary
This study compared the hydrological model performance of different sub-annual calibration schemes, which take into account intra-annual variations of climate. Two methods recognizing climatic patterns were applied to partition sub-periods with hydroclimatic similarities. The effect of time scales on sub-annual calibration schemes was also studied. Results indicate when using sub-annual calibration schemes, the selection of partitioning method and time scale is important to model performances.
This study compared the hydrological model performance of different sub-annual calibration...
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