滇西怒江河谷潞江段泥石流灾害时空发育特征

Temporal-spatial development characteristics of the mud-rock flow in Lujiang segment of Nujiang River valley,western Yunnan Province

通过对怒江河谷潞江段21条泥石流重点沟道堆积物的沉积特征、形成基本条件的野外调查,结合室内泥石流沟汇水面积、纵比降的数理统计,运用光释光(OSL)测年技术对洪积物的年龄进行测定,揭示了研究区泥石流的发育具有明显的区域性和分期性。结果表明以潞江为界,泥石流从西岸向东岸迁移;东岸泥石流的发育存在南北差异,具有从北向南发展的趋势而且期次明显,两岸泥石流发育分为3期。

Based on field investigation of the depositional sedimentary characteristics of mud-rock flow deposits in 21 key trenches and their basic formation conditions in the Lujiang River（a segment of the Nujiang River）,in combination with the indoor mathematical statistics of the mud-rock flow ditch catchment area and the vertical gradient,the authors used OSL to measure the age of the diluvium.The authors hold that the development of the mud-rock flow has obvious regional and periodic characteristics.The results obtained indicate that,with the Lujiang River as the boundary,the mud-rock flow migrated from the west bank to the east bank,the east bank mud-rock flow grew differently in the north and in the south,and tended to develop from north to south with obvious phases,and the growth of the mud-rock flow can be divided into three phases.