甘肃省引洮工程泥石流地质灾害调查现状及防治对策

Investigation Status and Control Countermeasures of the Debris Flow Geological Hazard for Tao River Water Diversion Project of Gansu Province

摘要:

引洮工程是甘肃省中部地区扶贫开发的重点项目之一, 是以洮河九甸峡水利枢纽工程为水源，重点解决甘肃省中部干旱地区缺水问题。该项目行政区划上涉及卓尼、临洮、渭源、定西、陇西和榆中等6县，工程涉及范围跨西秦岭山地、陇西黄土高原和马衔山—兴隆山山地3大地貌单元，主要地质灾害类型为崩塌、滑坡、泥石流、黄土湿陷等，地质环境条件复杂。本文通过大量的野外观察与现场调查，对评估区主要地质灾害之一泥石流进行了评估，结合供水工程主要为线性工程和泥石流分布特点，将其评估范围向渠道两侧适度扩展,最后提出了相应的灾害防治措施。

Abstract:

Tao River water diversion is one of the most important projects of poverty alleviation and development in central Gansu during “The Tenth Five-Year Plan” period, with Jiudianxia water control project of Taohe River as the source of water, the water shortage in arid region in central Gansu is focused on. The administrative division of this project involves 6 counties of Zhuoni, Lintao, Weiyuan, Dingxi, Longxi and Yuzhong and the project includes 3 major landform units across mountain area of West Qinling, Longxi loess plateau and mountain area of Maxian mountain-Xinglong mountain. The geological condition is quite complicated with main geological hazards of collapse, landslide, debris flow and loess collapsibility. In this paper, the evaluation is carried out on debris flow, one of the main geological hazards, through lots of filed observation and in-situ investigation, and combined with the characteristics of linear engineering and debris flow distribution in this water supply project, the evaluation range is extended at both sides of the channel, the corresponding measures of hazard prevention and control are put forward.