长江上游泥石流危险度区划的原则与指标

PRINCIPLES AND INDEXES OF THE REGIONALIZATION OF DEBRIS FLOW DANGER DEGREE IN THE UPPER REACHES OF CHANGJIANG RIVER

长江上游泥石流危险度区划属类型区划．其遵循的是相对一致性，定性指标与定量指标相结合，主导因素，以及综合分析四个原则，区划的指标有：１．自然指标，即统计单元内泥石流发生发展的环境条件──地貌、地质、气温和降水各自的综合评价值；２．经济指标，即统计单元内区域经济发展程度──单位面积上的社会生产总值，人均收入值，工业产值与社会生产总值之比值，以及交通发展程度系数．对环境条件和经济条件分别作了因素分析和相关分析，以进行泥石流危险度区划．

The regionalization belongs to a type division. The principles of the regionalization are asfollows:1.The principle of relative identiy:the relative identities on the forming environmentalconditions of debris flow(landform,geology,temperature and precipitation ) and the level of regional economic development.2.The principle of combining quantitative with qualitative indexes.3. The principle of dominant factors.4.The principle of comprehensive analysis.The indexes of the division include natural and economic indexes.The natural indexes consistof direct and indirect indexes. The indirect indexes which include landform,geology temperature and precipitation are adopted in the division because of the unbalanced regional debris flow studyand the districts with shortage data or without any data.Based on factors analysis and relative analysis on the most factors of every index,the valuesof comprehensive evaluation of natural indexes(such as relative height,length of fault,temperature difference and short-duration intensity)are obtained so as to obtain the division indexes of regional economic level. As a result the regionalization of debris flow danger degreemay be worked out.