SCS-CN模型中CN值的空间移用效果研究
发布时间：2019-04-25 08:35
【摘要】：SCS-CN模型因其曲线数CN值可以根据下垫面(土壤和植被)确定,近年来在分布式水文模拟和无/缺资料地区得到较为广泛的应用。美国土壤保持局提供的CN查算表在中国地区并不完全适用,如果直接采用,可能会带来较大的径流计算误差。选择资料数据较好的北京柏崖厂站作为假定的无实测径流资料的目标站,通过相似流域特性分析确定北山下站为参证站,利用参证站资料计算出CN值校正系数,并将该系数引用到目标站,利用校正前后的CN值分别模拟多场次洪水。结果表明,SCS-CN模型的参数CN值修正后,在空间上具备一定的外推能力;无论在确定性系数、径流总量精度和洪峰流量精度上,CN值修正后的洪水预报精度都要比修正前要高。
[Abstract]:In recent years, SCS-CN model has been widely used in distributed hydrological simulation and data-free areas due to its C _ C value of curves can be determined according to the underlying surface (soil and vegetation). The CN table provided by the U.S. Soil Conservation Administration is not fully applicable in China. If it is adopted directly, it may result in a large runoff calculation error. Beijing Baiya Factory Station, which has better data, is selected as the target station without observed runoff data. By analyzing the characteristics of similar watershed, Beishan Lower Station is determined as reference station, and the correction coefficient of CN value is calculated by reference station data. The coefficient is applied to the target station, and the CNvalues before and after correction are used to simulate the multi-field flood. The results show that the parameter C C of the SCS-CN model has a certain extrapolation ability in space after being modified. In terms of deterministic coefficient, total runoff accuracy and Hong Feng discharge precision, the accuracy of flood forecast after correction of C _ C value is higher than that of pre-correction.
【作者单位】： 河海大学水文水资源学院;
【分类号】：P334
本文编号：2464946
[Abstract]:In recent years, SCS-CN model has been widely used in distributed hydrological simulation and data-free areas due to its C _ C value of curves can be determined according to the underlying surface (soil and vegetation). The CN table provided by the U.S. Soil Conservation Administration is not fully applicable in China. If it is adopted directly, it may result in a large runoff calculation error. Beijing Baiya Factory Station, which has better data, is selected as the target station without observed runoff data. By analyzing the characteristics of similar watershed, Beishan Lower Station is determined as reference station, and the correction coefficient of CN value is calculated by reference station data. The coefficient is applied to the target station, and the CNvalues before and after correction are used to simulate the multi-field flood. The results show that the parameter C C of the SCS-CN model has a certain extrapolation ability in space after being modified. In terms of deterministic coefficient, total runoff accuracy and Hong Feng discharge precision, the accuracy of flood forecast after correction of C _ C value is higher than that of pre-correction.
【作者单位】： 河海大学水文水资源学院;
【分类号】：P334
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