Estimation of surface runoff and sediment yield using WEPP model in Southern Ontario, Canada
Estimation of surface runoff and sediment yield using WEPP model in Southern Ontario, Canada
复制标题
使用加拿大安大略省南部的 WEPP 模型估算地表径流和产沙量
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Dehvari
中科院分区：
文献类型：
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作者：
A. Dehvari
Three small watersheds, with areas between 4594 to 19325 m 2 within Lucknow River basin, Ontario, Canada, were delineated using LiDAR DEM. The WEPP model was used in this study to estimate surface runoff and sediment yield in different slope and management systems in a 13-year simulation period. The principal objective of this study was to assess the effect of using three different DEM resolutions (1, 5 and 10 m) on WEPP model output. The model was tested using Lucknow River daily discharge data. The t-test results showed that there are significant differences between measured and simulated WEPP output in annual basis, while Nash-Sutcliffe coefficient represented low deviation between the daily average measured and predicted data in a longer period (13 years). As the DEM resolution became coarser, the mean values of the prediction of runoff depth and sediment yield changed for each event size. The ANOVA test showed that the WEPP model with 1- m DEM resolution did not predict runoff or sediment yield significantly better than simulation using 5 and 10- m resolutions in this particular landscape. This conclusion is important because it implies that it may not be necessary to extract costly fine-resolution DEM for the application of watershed modeling in undulating topography such as southern Ontario.
