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Development of a distributed hydrological model to facilitate watershed management |
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| Authors: | Sisi Li Margaret Gitau Bernard A. Engel Yun Du Carlington Wallace |
| Affiliation: | 1. Key Laboratory of Environment and Disaster Monitoring and Evaluation of Hubei, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China;2. Department of Agricultural &3. Biological Engineering, Purdue University, West Lafayette, Indiana, USA;4. University of Chinese Academy of Sciences, Beijing, China;5. Department of Agricultural & |
| Abstract: | To facilitate precise and cost-effective watershed management, a simple yet spatially and temporally distributed hydrological model (DHM-WM) was developed. The DHM-WM is based on the Mishra-Singh version of the curve number method, with several modifications: The spatial distribution of soil moisture was considered in moisture updating; the travel time of surface runoff was calculated on a grid cell basis for routing; a simple tile flow module was included as an option. The DHM-WM was tested on a tile-drained agricultural watershed in Indiana, USA. The model with the tile flow module performed well in the study area, providing a balanced water budget and reasonable flow partitioning. The daily coefficient of determination and Nash-Sutcliffe coefficient were 0.58 and 0.56, for the calibration period, and 0.63 and 0.62 for the validation period. The DHM-WM also provides detailed information about the source areas of flow components, the travel time and pathways of surface runoff. EDITOR A. Castellarin; ASSOCIATE EDITOR F.-J. Chang |
| Keywords: | distributed hydrological model watershed management variable source area travel time tile flow non-point source pollution |