黄河下游干流纵向离散系数估算方法

利用水文监测数据,采用理论积分公式计算纵向离散系数,通过量纲和相关分析得到估算黄河下游干流纵向离散系数的一般公式形式;考虑河床变化大、河道不顺直、含沙量大等特点,根据研究河段不同的河道特征,以理论计算值作为样本数进行多元回归分析,采用分段的方式分别得到适用于黄河下游干流河段的污染物纵向离散系数的经验估算公式.结果表明,应用该经验估算公式得到的山东河段相关系数较高,河南河段估算结果不够理想.

A new method for estimating the longitudinal dispersion coefficient in the main stream of the lower Yellow River

Based on hydrologic monitoring data and a theoretical integration formula,a general formula for the longitudinal dispersion coefficient in the main stream of the lower Yellow River was presented through dimensional analysis and multiple regression analysis.Using the theoretical calculation results as the sample number of the multiple regression analysis and taking the different characteristics of river sections,which is mainly caused by the riverbed variation,meandering of rivers and high sediment concentration,into account,the empirical formula for the longitudinal dispersion coefficient of pollutants in different sections was established.This formula can be applied in the establishment and application of a one-dimensional water quality model in the water quality pre-warning and prediction system for the main stream of the lower Yellow River.