[1]XIONG Yu,FANG Nufang,SHI Zhihua.Application of Improved SCS Model Based on Variable Source Area[J].Research of Soil and Water Conservation,2017,24(02):289-292,299.
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Application of Improved SCS Model Based on Variable Source Area
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 02
Page number:
289-292,299
Column:
Public date:
2017-04-28
- Title:
- Application of Improved SCS Model Based on Variable Source Area
- Keywords:
- rainfall; runoff; small watershed; variable source area; SCS model
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- Estimation of direction runoff is essential for soil erosion prediction and soil and water conservation plan. The Soil Conservation Service Curve Number (SCS-CN) method developed by the USDA-Soil Conservation Service is widely used for the estimation of direct runoff for a given rainfall event from small watersheds due to its low input data requirements and its simplicity. However, it is limited in predicting the location of source areas. We present an improved SCS method based on variable source area (VSA). It was applied to Wangjiaqiao watershed to analyze 50 measured rainfall-runoff events. The CN-VSA method was compared with the traditional SCS-CN0.2 method and the SCS-CN0.05 method. The results indicated that both the CN-VSA method and the SCS-CN0.05 method could well predict runoff volume. The R2 of the CN-VSA method was 0.802 and efficiency coefficient (E) was 0.651 compared with 0.763 and 0.766 for the SCS-CN0.05 method. Locations of runoff source area varied during individual storm events when using the CN-VSA method. The CN-VSA method can be used for comprehensive management and hydrologic effects assessment of small watershed.
- References:
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