摘要
SCS-CN(Soil Conservation Service Curve Number)模型是广泛应用经验性水文模型,其模型参数的确定与空间尺度效应对径流模拟结果有着重要的影响。选取淮河上游为研究区,分析SCS-CN模型参数的敏感性并对模型进行改进,探讨了9种栅格尺度(100~2000m)下径流模拟结果的空间尺度效应。研究结果表明:SCS-CN模型输入参数中,系数b的敏感性高于初损系数(λ),将参数b值作为模型需要修正的参数;随着空间尺度增加,下垫面各要素的尺度变化使得参数b呈指数递减趋势;模型模拟精度的最佳空间尺度范围是250~500m尺度。
The Soil Conservation Service Curve Number(SCS-CN)method is a widely used empirical hydrologic model.Determination of its parameters and spatial scale effect of parameters have important influences on the accuracy of runoff simulations.With the upstream area of Huaihe River as the research area,we analyzed the sensitivity of SCS-CN model parameters and further modified the model.Spatial scale effects of parameters were analyzed based on the runoff simulation results at nine spatial resolutions(100 m^2000 m).The results show that the sensibility of the basin water storage capacity parameter b was higher than that of the initial abstraction ratio(λ),which should be calibrated in the model.The spatial resolutions of underlying surface features had an important effect on the calibrated parameter b,which showed an exponential decreasing trend as the pixel scale increased.The optimal spatial resolution of the modified SCS model was 250-500 m.
作者
李鑫川
贺巧宁
张友静
LI Xinchuan;HE Qiaoning;ZHANG Youjing(School of Urban and Environmental Sciences,Normal University,Huai′an 223300,China;Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing210008,China;School of Earth Sciences and Engineering,Hohai University,Nanjing210098,China)
出处
《南水北调与水利科技》
CAS
北大核心
2019年第5期64-70,130,共8页
South-to-North Water Transfers and Water Science & Technology
基金
国家自然科学基金（41801075）
中国科学院流域地理学重点实验室开放基金（WSGS2017009）
江苏省高等学校自然科学研究项目（18KJB170002）
中国博士后科学基金（2018M642349）~~
关键词
SCS-CN模型
参数敏感性分析
空间尺度效应
淮河上游
SCS-CN model
parameter sensitivity analysis
daily runoff simulation
spatial scale effect
upstream of Huaihe River
