黄河内蒙古段十大孔兑产沙量估算模型分析

Estimation Model of Sediment Yield Quantity in Ten Tributaries of Inner Mongolia

基于十大孔兑已有实测资料,分析了研究区域范围内暴雨强度、十大孔兑河床床沙质组成及流域面积等因素对十大孔兑产沙的影响。结果表明,十大孔兑在产沙原理和模式上具有相同的共性,而在单次洪水过程中,各孔兑产沙量不同主要是受降雨、流域面积两因素的影响。由此采用最小二乘法,构建了孔兑输沙估算模型,利用已有的孔兑实测资料推算其他无观测资料的孔兑输沙量,推算结果表明该估算方法有效可行。

According to the actual measured data of ten tributaries,each tributary＇s sediment yield characteristics could be discussed to analyze the factors,including storm intensity,tributary riverbed material＇s particle size and drainage area,which impact the process of tributary＇s sediment yield.The conclusion is that each tributary has the same characteristics in the principle and model of sediment yield.In the process of a single flood,drainage area and rainfall are two factors which affect the sediment quantity of different tributary.So,the least square method is used to build sediment yield estimation model.Then the sediment yield quantity of the tributary without actual measured is computed by the other tributary＇s actual data.The calculation result shows that the proposed method is effective.