【摘要】：SCS-CN模型因其曲線數(shù)CN值可以根據(jù)下墊面(土壤和植被)確定,近年來(lái)在分布式水文模擬和無(wú)/缺資料地區(qū)得到較為廣泛的應(yīng)用。美國(guó)土壤保持局提供的CN查算表在中國(guó)地區(qū)并不完全適用,如果直接采用,可能會(huì)帶來(lái)較大的徑流計(jì)算誤差。選擇資料數(shù)據(jù)較好的北京柏崖廠站作為假定的無(wú)實(shí)測(cè)徑流資料的目標(biāo)站,通過相似流域特性分析確定北山下站為參證站,利用參證站資料計(jì)算出CN值校正系數(shù),并將該系數(shù)引用到目標(biāo)站,利用校正前后的CN值分別模擬多場(chǎng)次洪水。結(jié)果表明,SCS-CN模型的參數(shù)CN值修正后,在空間上具備一定的外推能力;無(wú)論在確定性系數(shù)、徑流總量精度和洪峰流量精度上,CN值修正后的洪水預(yù)報(bào)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.
【作者單位】： 河海大學(xué)水文水資源學(xué)院;
【分類號(hào)】：P334

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