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| DOI：10.13522/j.cnki.ggps.2022112 |
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| An Optimized SCS-CN Method to Calculate Runoff over Different Underlying Surfaces in Yanqing District of Beijing |
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LI Zhimei
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Water and Soil Conservation Management Station of Yanqing District Water Bureau of Beijing, Beijing 102100, China
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| Abstract: |
| 【Objective】The soil conservation service curve number (SCS-CN) method is an empirical model developed in the 1950s to estimate event-based rainfall-runoff response. We propose an optimized SCS-CN in this paper and apply it to calculate runoffs in different underlying surfaces in Yanqing District of Beijing.【Method】 Seven different underlying surfaces were selected, and long-term measured rainfall and runoff from each is used to establish and validate the improved SCS-CN model.【Result】①The results calculated using the standard SCS-CN model are higher than the measured values from all seven underlying surfaces. ②The improved SCS-CN model is more accurate than the standard SCS model to reproduce the measured data. ③The improved SCS-CN model is most accurate for estimating runoffs in fallow land, followed by forest land and cultivated land.【Conclusion】The standard SCS-CN model is not suitable for calculating runoff in the seven underlying surfaces in Yanqing District of Beijing, and the proposed SCS-CN model significantly improves it. |
| Key words: SCS-CN model; runoff calculation; runoff curve; model improvement; Yanqing District |
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