黄河上游寺沟峡—拉干峡段滑坡时空特征及对气候变化的响应研究  

SPATIAL AND TEMPORAL CHARACTERISTICS OF LANDSLIDES AND THERE RESPONSE TO CLIMATIC CHANGE FROM SIGOU TO LAGAN GORGES IN UPPER REACHES OF YELLOW RIVER

作　　者：殷志强[1] 魏刚 祁小博[1] 周翠琼 

机构地区：[1]中国地质环境监测院,北京100081 [2]青海省环境地质勘查局,西宁810007 [3]云南省地质环境监测院,昆明650216

出　　处：《工程地质学报》2013年第1期129-137,共9页Journal of Engineering Geology

基　　金：国家自然科学基金项目(40802089);国土资源地质调查项目(1212011220123)资助

摘　　要：滑坡发育动力机制对全球气候变化的响应过程逐渐成为地质灾害研究领域的热点和焦点问题。文章以我国地质灾害高易发区的黄河上游寺沟峡—拉干峡段大型、特大型、巨型滑坡为研究对象,在广泛收集区域古气候演化资料和滑坡年代测定的基础上,开展了末次冰期以来特大型、巨型滑坡发育的时空分布规律研究,分析了滑坡的主要发育期与全球气候变化的响应关系,在此基础上探讨了研究区滑坡发育的动力机制对气候变化的响应过程。主要取得了以下认识:(1)研究区滑坡异常发育,分布广泛、成灾规模大、动力机制复杂、危害严重,在空间上以群科—尖扎盆地最为发育;(2)利用滑坡钻孔滑带土和滑坡体与上下覆黄土的叠置关系开展了滑坡体的年代学测定工作,并从时间尺度上划分了滑坡的5个主要发育期,其分别为53～49ka B.P.、33～24ka B.P.、10～8ka B.P.、5～3.5ka B.P.和现代;(3)研究区滑坡的主要发育期分别对应于中国黄土高原马兰黄土中的2层弱发育古土壤层L1-4和L1-2、末次冰期晚期/全新世过渡期、全新世适宜期和现代全球升温期;(4)全球不同地区滑坡的发育期与气候变化有密切联系,其主要发育于古气候的温暖湿润期和气候变化的快速转型期。Landslides forming dynamic mechanism and their response to the global climatic change are becoming a hot and focus issue in geological disasters research. This paper is based on paleo-climate evolution, the evolution of the Yellow River and the chronology of some landslides. It studies typical landslides from Sigou gorge to Lagan gorge in the upper reaches of the Yellow River, where is one geo-hazard high-prone zoning area in China. The spa- tial and temporal distribution characteristics of the massive landslides and the giant landslides are summarized. The relationship between landslide development periods and the response of landslides to the global climatic change are also analyzed. On the basis of above study, the authors discuss the dynamic mechanism of landslide development and the climate change. They believe that the ancient and old landslides mainly occurred in the warmly and humid- ly periods and the rapid climate change transition stages. The results of this research are as follows. （ 1 ） the land- slides of the studied areas distributed widely and led severe geological disasters, particularly in the Qunke-Jianzha Basin. The dynamic mechanism of landslides is very complicated. （2）With dating samples of slip zone of landslides and studying the relation between a landslide and its overlying or under-covering loess formation, the chronology se- quence of landslides is established. Five stages of landslide development are divided, i. e. 53 - 49ka B. P. ,33 N 24ka B. P. ,10 -8ka B. P. ,5 -3.5ka B. P. and present. （3）the landslides developmental stages are closely corre- sponds to warm and wet stages over the last 100ka, i. e. ,the two weak paleosol-developed stages of Malan loess of the last glacial period in the Chinese loess Plateau Ltz and LI_2. They both are belong to the marine oxygen isotope stage 3, the last deglacial period, the Holocene Optimum and the present global warming period. （4）Landslide-trig- gered drivers may be closely linked to the global climate change. Landslides mainl

关 键 词：黄河上游 滑坡 时空特征 气候变化 响应 

分 类 号：TU457[建筑科学—岩土工程]