期刊
JOURNAL OF HYDROLOGY
卷 357, 期 3-4, 页码 303-316出版社
ELSEVIER
DOI: 10.1016/j.jhydrol.2008.05.021
关键词
rainfall-runoff modeling; land cover; long-term water balance; overparameterization; sensitivity analysis; budyko formula
This paper investigates the link between vegetation types and long-term water balance in catchment areas. We focus on the most widely used water balance formulas or models - that relate long-term annual streamflow to long-term annual rainfall and long-term potential evapotranspiration estimates. Our investigation seeks to assess whether long-term streamflow can be explained by land cover attributes. As all but one of these formulas do not use land cover information, we develop a methodology to introduce land cover information into the models' formulations. Then, the modified formulas are compared to the original ones in terms of performance and a sensitivity analysis is performed, with a special focus on the parameters representing vegetation characteristics. In line with the global coverage of long-term water balance models, we base our work on as many basins as possible (1508) representing as Large a hydroclimatic variety as possible. Results show that introducing additional degrees of freedom within the original formulas improves overall model efficiency, and that Land cover information makes only a small but nonetheless significant contribution to this improvement. (c) 2008 Elsevier B.V. All rights reserved.
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