基于困难度指数的中国公路地貌区划

Landform regionalization for highway in China based on difficulty index

为了研究公路地貌的分异规律,根据公路地貌区划的原则和方法,选择大地构造、地面自然坡度等作为中国公路地貌一级区划的主要指标,将中国分为5个地貌一级区;选择困难度指数作为中国公路地貌二级区划的主导指标,以海拔高程、地面自然坡度、地表破碎程度、地层岩性和植被类型作为主要影响因素,建立了困难度指数计算模型。结合公路工程实际,建立了影响因素等级划分体系和影响度值;采用专家打分的方法,确定各影响因素的权重值;利用地理信息系统(GIS)计算了困难度指数,并建立了困难度指数等级划分体系。在中国公路地貌一级区划的基础上,按困难度指数将全国分为42个公路地貌二级区。

In order to study the differentiation regularity of highway landform, according to the principles and methods of regionalization, the tectonic and slope were selected as the main index of first-order of landform regionalization for highway in China, and China was divided into 5 firstorder landform districts. The difficulty index was selected as the leading index of second-order of landform regionalization. The calculated models for difficulty index was built based on the main influencing factors like altitude, slope, fragmentation degrees of earth＇s surface, type of rock and soil as well as vegetation characteristics. The grade of main influencing factors and their weight were put forwarded based on actual situation of highway engineering. The weight of main influ- encing factors was determined by expert system. The distribution of national difficulty index was analyzed by GIS. Based on the first-order regionalization and difficulty index, China was divided into 42 second-order landform districts, 3tabs, 2 figs, 11 refs.