金沙江下游云南小江流域山地灾害综合区划

在分别完成云南小江流域泥石流危险度区划、滑坡危险度区划和土壤侵蚀强度分区的基础上,对小江流域山地灾害进行综合区划。结果为,共分为三个不同等级的山地灾害综合区:(1)一级(高危险度)山地灾害综合区,(2)二级(次高危险度)山地灾害综合区和(3)四级(低危险度)山地灾害综合区;无三级(中危险度)山地灾害综合区。其中一级(高危险度)区面积1 425.34 km2,有泥石流沟84条,占区划区域泥石流沟总数的60.0%,有滑坡137个,占区划区域滑坡总数的77.4%,土壤侵蚀强度以轻、中度为主;二级(次高危险度)区面积756.79 km2,有泥石流沟35条,占区划区域泥石流沟总数的25.0%,有滑坡34个,占区划区域滑坡总数的19.2%,土壤侵蚀以轻、中度为主;四级(低危险度)区面积863.20 km2,有泥石流沟21条,占区划区域泥石流沟总数的15.0%,有滑坡6个,占区划区域滑坡总数的3.4%,土壤侵蚀以轻度为主。

Comprehensive Regionalization of Mountain Hazards in Xiaojiang River Basin of the Lower Jinshajiang River, Yunnan, China

After completing the dangerous degree regionalization of debris flow,landslide and the soil erodes the strength of Xiaojiang river basin of the lower Jinshajiang river in Yunnan province,southwest China comprehensive regionalization of mountain hazards in Xiaojiang river basin has been finished.Consequently is,totally is divided into the mountain hazards comprehensive district of three different grades:(1) the first class(high dangerous degree) mountain hazards district,(2)the second class(higher dangerous degree) mountain hazards district with(3) the fourthly class(low dangerous degree) mountain hazards district.Have no the third class(middling dangerous degree) mountain hazards district.Among them,the area of the first class(high dangerous degree) district is 1 425.34 km2,there is 84 debris flow ravines,and occupy the area of regionalizing district debris flow ravine total amount of 60.0%,have the 137 landslides,and occupy the area of regionalizing district landslide total amount of 77.4%,the soil erodes the strength primarily there is two types: low and middling degree;Second class(higher dangerous degree) area is 756.79 km2,there is 35 debris flow ravines,and occupy the area of regionalizing district debris flow the ravines total amount of 25.0%,have the 34 landslides,and occupy the area of regionalizing district landslide total amount of 19.2%,the soil erode with the low degree;area of fourthly class(low dangerous degree) mountain hazards district is 863.20 km2,there is 21 debris flow ravines,and occupy the area to regionalized district debris flow ravine total amount of 15.0%,have the 6 landslides,and occupy the area of regionalizing district landslide total amount of 3.4%,the soil erode the strength to regard low degree as principle.