西南山地灾链的区域分异

REGIONAL DIFFERENTIATION OF THE MOUNTAIN HAZARD CHAIN IN SOUTHWEST CHINA

我国西南山区各种山地灾害（暴雨、崩塌、滑坡、泥石流与洪水）往往彼此相伴生，而成串联式链状结构。以泥石流为主害灾种的灾链演变有五个阶段。据灾链演化区域分异性，分出四个大区九个灾区。

In southwest China the mountain hazards(rainstorm ,avalanche,landsilde, debris flow andnod)become causal relation each other,then become a series of hazard chain structure. So it is called mountain hazard chain. In the chain there is base generatic hazare,heavy hazard andthyristor hazard.It may achive the maximun efficiency to control thyristor hazard.The debris flow is a thyristor hazard of mountain hazard chain in Southwest China, Itge nerated and developed with mountain geomorphologic evolution. There are 5 stages in debrisflow prosses,i.e. heet slope ,rill, gully,ravine and small stream.According to regional differentiation of mountain and hazard condition,mountain hazardchain in Southwest China is divided 4 regions(Qinghai-Xizang Plateau,Hengduan Mountains,Xichuan Basin, Yunnan-Guizhou Plateau)and 9 areas( middle reaches and lower reaches ofJinshajiang River,Longmen-Qionglai mountain,middle,north and south mountains of SichuanBasin,Guizhou Plateau , Yunnan Plateau, mountain plain of SOuth Yunnan)。