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冰川冻土 ›› 2013, Vol. 35 ›› Issue (6): 1610-1618.doi: 10.7522/j.issn.1000-0240.2013.0178

• 生态经济与可持续发展 • 上一篇    

甘肃河西地区泥石流沟分布特征与易发性评估研究

刘金鹏1,2, 高世铭3, 王得楷1, 蓝永超*2, 王国亚1   

  1. 1. 甘肃省科学院 地质自然灾害防治研究所, 甘肃 兰州 730000;
    2. 中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000;
    3. 甘肃省科学院, 甘肃 兰州 730000
  • 收稿日期:2013-02-23 修回日期:2013-11-19 出版日期:2013-12-25 发布日期:2014-01-11
  • 通讯作者: 蓝永超,E-mail: lyc@lzb.ac.cn E-mail:lyc@lzb.ac.cn
  • 作者简介:刘金鹏(1972-),男,甘肃古浪人,副研究员,2011年在西安理工大学获博士学位,现为中国科学院寒区旱区环境与工程研究所在站博士后,主要从事水文水资源、 地质灾害防治研究. E-mail: liujp03@126.com
  • 基金资助:

    2012年"西部之光"项目"极端气候条件下河西地区山洪泥石流地质灾害形成机理及防治研究";国家自然科学基金重大研究计划项目(91225302)资助

Research on Distribution Feature of Debris Flow Gullies and TheirSusceptibility Evaluation in Hexi Area of Gansu Province

LIU Jin-peng1,2, GAO Shi-ming3, WANG De-kai1, LAN Yong-chao*2, WANG Guo-ya1   

  1. 1. Geologic Hazards Prevention Institute, Gansu Academy of Sciences, Lanzhou Gansu 730000, China;
    2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China;
    3. Gansu Academy of Sciences, Lanzhou Gansu 730000, China
  • Received:2013-02-23 Revised:2013-11-19 Online:2013-12-25 Published:2014-01-11

摘要:

根据汇水面积、松散物质储量、沟坡坡度、主沟纵坡降等4项泥石流沟易发性判断特征指标,利用数理统计方法,对甘肃省河西地区20个县、区、市的587条泥石流沟现状进行了分析研究. 结果表明:河西地区泥石流多发育在南北山地的前山走廊地带,泥石流沟分布密度稀疏,属于泥石流稀疏地区. 在泥石流沟易发性主要特征指标方面,研究区汇水面积指标处于偏轻微程度,松散物质储量指标处于中等程度,沟坡坡度指标处于严重程度,主沟纵坡降指标处于中等以下程度. 在泥石流沟易发性评价结果方面区域总体属于泥石流地质灾害低易发-中易发区域. 在全球气候变暖的背景下,研究区内强降水情况发生频率呈现增强趋势,应积极开展极端天气影响下河西地区泥石流发展趋势和干旱、半干旱地区植被特征与泥石流易发性之间的相关关系研究.

关键词: 泥石流, 易发性评价, 调查研究, 河西地区

Abstract:

There are 587 debris flow gullies have been investigated in 20 counties, districts and cities in Hexi Corridor area in Gansu Province by debris flow gully judgment standards, four characteristics of catchment area, loose material reserves, slope gradient and main gully longitudinal slope, taken as the measure indexes. The statistics from the field work and information analyses have shown that debris flow gullies in Hexi area mainly developed in the corridor of the fore range of southern and northern hilly areas, and they have a sparse distribution density and belong to sparse debris flow areas; geological disasters caused by debris flow in this area on the whole have a low and middle-level tendency of occurrence based on the results of susceptibility evaluation of debris flow gullies. The results also indicate that heavy rain occurring frequency in the research area showed a trend of increase under the influences of global warming. Therefore, it is suggested that studies be actively carried out on the debris flow development trend in Hexi area and on the correlativity between vegetation and occurrence susceptibility of debris flow in arid and semi-arid areas.

Key words: debris flow, susceptibility evaluation, investigation, Hexi area

中图分类号: 

  • P642.23