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。
【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】(1)The results calculated using the standard SCS-CN model are higher than the measured values from all seven underlying surfaces.(2)The improved SCS-CN model is more accurate than the standard SCS model to reproduce the measured data.(3)The 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.
作者
李志梅
LI Zhimei(Water and Soil Conservation Management Station of Yanqing District Water Bureau of Beijing,Beijing 102100,China)
出处
《灌溉排水学报》
CAS
CSCD
北大核心
2023年第2期103-109,共7页
Journal of Irrigation and Drainage
