| 摘要: |
| 【目的】优化CN值构建SCS-CNP模型，探讨SCS-CNP模型在延庆地区典型下垫面条件下的适用性。【方法】以延庆区7种典型下垫面为研究对象，利用研究区长期观测的降水-径流数据，采用多元回归线性回归法，基于场降水量构建CN值估算方法并改进SCS-CN模型，并探究改进CN值后的模型（SCS-CNP）在不同下垫面中的适应性。【结果】①基于标准SCS-CN模型，7种不同下垫面条件（T1—T7处理）下的径流实测值整体低于模拟值；②改进的SCS-CNP模型在不同下垫面中的总体应用效果优于标准SCS模型；③改进SCS-CNP模型在休耕地下垫面条件下的模拟精度依次优于林地、耕地。【结论】标准SCS-CN模型不适用于延庆区典型下垫面条件下的径流模拟，改进后的SCS-CNP模型在延庆区典型下垫面条件下的径流模拟具有良好的适应性。 |
| 关键词: SCS-CN模型；径流计算；径流曲线数；模型改进；延庆区 |
| 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 |
