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根据区划原则和方法,选择对公路选线,尤其对桥位选择及路基和桥涵水毁防治影响很大的河川径流强度作为中国公路水文二级区划指标。选择降雨、植被覆盖度、沟谷比重和河网密度作为河川径流强度的主要影响因素,建立了河川径流强度计算模型;综合考虑公路工程特点,提出了影响因素等级划分体系和影响度值;应用层次分析法得到各影响因素的权重值。利用G IS系统计算河川径流强度指标,在中国公路水文一级区划的基础上,按河川径流强度指标的区域特性及等级划分原则,将全国分为22个河川径流强度区,得到中国公路河川径流强度分区图,分区结果对我国公路网规划有一定的指导意义。
According to the principle and method of zoning, the paper selects the runoff intensity of river which has a great influence on the route selection of road, especially on the choice of bridge position and prevention and cure of roadbed and bridge and culvert water damage as the index of secondary division of highway in China. The rainfall runoff, vegetation coverage, ratio of valley to valley and density of river network were selected as the main influencing factors of runoff intensity. The calculation model of runoff intensity of the river was established. Considering the characteristics of highway engineering, the hierarchy of influencing factors and the influencing value were put forward. Analytical method to get the weight of each factor. Using GIS system to calculate the river runoff intensity index, based on the regional hydrological level division of the highway in China and according to the regional characteristics and classification principle of the river runoff intensity index, the whole country is divided into 22 river runoff intensity regions, Intensity zoning map, zoning results for our country’s road network planning has some guiding significance.