甘肃临泽县地质灾害类型及特征

甘肃省张掖市临泽县是河西走廊地质灾害最为发育的县区之一。通过实地测量、调查评价和综合研究等手段,在概述县域自然地理条件及地质背景的基础上,县域内已有的地质灾害共30处,其中泥石流沟29条主要集中分布于祁连山和合黎山山前与走廊平原的过渡带,尤其是北部合黎山山前连片分布;崩塌1处为斜坡坡度65°的独山子崩塌。从地形条件、物质条件、降雨条件以及人类日益工程建设活动等方面研究表明,较大的沟床纵坡降比和流域面积、丰富的松散固体物质和短时间聚集的充足水源(多是有暴雨形成)是形成区内泥石流的基本条件。崩塌(不稳定斜坡)于公路沿线的人工开挖坡度大于60°的边坡地带。临泽县地质灾害具有不均匀性、突发性、周期性。该研究为县域地质灾害防灾减灾提供科学依据。

Types and characteristics of geological hazards in Linze County, Gansu Province

Linze County is one of the most developed counties for geological hazards in Hexi Corridor. By means of field survey, investigation, evaluation and comprehensive study, on the basis of summarizing the natural geographical conditions and geological background of the county, there are 30 geological disasters in the county, among them, 29 debris flow gullies are mainly distributed in the transitional zone between the front of Mount Heli and the strike-slip plain in Qilian Mountains, especially in the front of Mount Heli in the north. From the study of topographic conditions, material conditions, rainfall conditions and human activities in increasing engineering construction, it is shown that, the basic conditions for the formation of debris flow in the area are large longitudinal gradient ratio of gully bed, basin area, abundant loose solid material and sufficient water resources gathered in a short time. Collapse (unstable slope) is a slope zone along a highway with a slope gradient of more than 60 ° that is artificially excavated. Geological disasters in Linze County are characterized by inhomogeneity, suddenness and periodicity. The study provides scientific basis for the prevention and reduction of geological disasters at county level.