甘肃省地质灾害发育特征及防治对策

THE DEVELOPMENT CHARACTERISTIC AND PREVENTION AND TREATMENT OF GEOLOGIC HAZARD IN GANSU PROVINCE

甘肃省地处黄河、长江源头地区,因其特殊的自然地理条件,境内地质灾害类型多、发育集中,为我国地质灾害危害较严重的省份之一 长江流域所处的陇南地区地势高峻,河流切割强烈,降水量丰富,滑坡、泥石流集中发育 中部的黄土高原,土质疏松、地形破碎、沟壑交织、水土流失严重 降水量相对丰富的洮河中游、渭河、泾河上游地区黄土滑坡集中、泥流发育 河西走廊自然环境较差,由于人为不合理的水土资源开发造成土地沙漠化和土壤盐渍化为主的地质灾害发育 为此在论述各种地质灾害的分布规律的基础上,分析了其形成原因。

Situated in upper reaches of Changjiang and Huanghe river, Gansu is one of provinces that the geologic hazard is more serious and more types of geologic hazard concentrated, for its special natural geographic condition. There are great depth of dissection and abundance of precipitation in the south of Gansu, the landslip and debris flow are concentrated in this region. The loess plateau is located in middle of Gansu, and for its loosen loess, broken landform, dense erosive groove and serious soil erosion, there are lots of loess landslip and mud\|flow in middle reaches of Taohe river, upper reaches of Weihe and Jinghe river. The natural environment is atrocious in Hexi corridor, and the soil salinization and desertification, the main types of geologic hazard, occur in this place, for un\|rational utilization of water and soil resources. Based on describing the distribution regularity of various geologic hazard, their formation principle is reasoned in this paper. And then, focusing on the occurrence characters and degree of hazard, the manners of prevention and treatment are put forward.