西藏自治区革吉县那布居委会检查站泥石流发育特征及防治建议

王一伟 张显虎

摘要：西藏自治区革吉县那布居委会检查站泥石流是区内典型地质灾害勘查点，具有较强的代表性。通过地灾调查，认为该泥石流属暴雨沟谷型泥石流，受短时强降雨影响较大，划分为清水区、形成区、流通区及堆积区，物源以坡面侵蚀坡积物源为主，具备泥石流形成的孕灾条件。防治措施以工程防治为主，主要为修建排导槽和导流堤，汛期重点加强群测群防。

关键词：泥石流；发育特征；革吉县

Developmental characteristics and prevention recommendations of debris flow in Nabu neighborhood checkpoint，Geji，Tibet

WANG Yiwei，ZHANG Xianhu

Bureau of Geology and Mineral Resources Exploration and Exploration of Sichuan Province，Mianyang 621000

Abstract：The debris flow in Nabu neighborhood checkpoint，Geji，Tibet is a typical geological hazard exploration sites.It’s very representative.Through the ground disaster investigation.It is considered that the debris flow belongs to rainstorm gully type debris flow.Affected by short periods of heavy rainfall.It is divided into clean water area，formation area，circulation area and accumulation area.The provenance was mainly from slope erosion and slope deposition.It has the disaster condition of debris flow formation.Revention and control measures are mainly engineering prevention and control.Mainly for the construction of drainage channel and diversion dike.Flood season to strengthen the focus of the group survey and prevention.

Key word：Debris flow；Development characteristics；prevention recommendations；Geji，Tibet

那布居委會检查站泥石流位于革吉县革吉镇北西侧，距离革吉县城约1.5km，是西藏自治区革吉县1∶5万地质灾害详细调查项目中选定的典型勘查点之一，是查明该地区泥石流的规模、物源条件、松散固体物源储量等特征的最佳勘查点，具有较强的代表性。根据调查，那布居委会检查站泥石流最近一次发生时间为2002年8月16日[1]，若泥石流再次发生灾害，将直接威胁沟口下方革吉县人民群众生命财产安全。

1.地质环境背景

1.1地形地貌

革吉县地处羌塘高原大湖盆区，地势由西南向北东倾斜，县域内山势高耸，平均海拔4800m，最高海拔可达6175m，最低点位于县境西界森格藏布河床一带，海拔4402m，最大相对高差1773m[2]。县域北东区域地势逐低，高差减小，山势平缓。

1.2气象水文

革吉县地处羌塘高原大湖盆区，属高原亚寒干旱气候区[3]，冬季时间长，昼夜温差大，气候严寒，年平均气温为-2.0℃，全年没有绝对无霜期，每年十月至次年五月为风雪期和土壤冻结期，六月到八月为生长期。……