一、前言河流枯水流量是重要的水文特征数据,它对于城市供水,农业灌溉、航运、小水电、渔业等都很重要。就环境水文学而言,河流枯水期,河水稀释作用减少,污染程度相对增大,因此预测不同频率的枯水流量的准确度,将直接影响到水质污染的预报精度,其重要性也是不言而喻的。在各种枯水流量中,一般采用年最小日平均流量或最小月平均流量作为水污染控制 I. Preface The low flow of rivers is an important hydrological characteristic data. It is important for urban water supply, agricultural irrigation, shipping, small hydropower and fisheries. In terms of environmental hydrology, the river dilutive effect decreases during the dry season, and the pollution degree increases relatively. Therefore, the accuracy of predicting the dry flow rate at different frequencies will directly affect the forecast accuracy of water quality pollution, and its importance is not overstated Yu’s. In a variety of low flow, the average annual minimum daily average flow or the minimum monthly average flow as water pollution control