逆高斯分布地貌瞬时单位线

An inverse Gaussian distribution geomorphologic instantaneous \=unit hydrograph

本文假设水质点在河道状态传播时间的概率密度函数服从逆高斯分布，并根据地貌瞬时单位线理论建立了逆高斯分布地貌瞬时单位线模型．推导了三级流域的瞬时单位线，并对其性质作了分析．讨论了矩法和Ｐｏｗｅｌ法两种求解模型参数的方法，并用南雁流域的雨洪资料对模型进行了检验．结果表明：模型结构合理，Ｐｏｗｅｌ法求参比较有效。

Assuming the probability density function of the traveling time of water particles in channel is inverse Gaussian distribution(IGD), an IGD geomorphology instantaneous unit hydrograph (GIUH) model is developed. The GIUH of three\|order basin is derived and the nature of the GIUH is analyzed. The moment method and Powell's method which are used to obtain the parameters of the proposed model are discussed. The model is applied to the calculation of Nanyan catchment and the result shows that the accuracy of the model is high enough.\=