鲜水河下游泥石流发育分布特征研究  

STUDY ON THE DEBRIS FLOW DISTRIBUTION CHARACTERISTICS OF THE LOWER XIANSHUI RIVER

作　　者：邹小虎 沈军辉[2] 崔建凯[2] 廖明亮[3] 胡耀飞[3] 

机构地区：[1]四川省地矿局405地质工程队,都江堰611830 [2]成都理工大学地质灾害防治与地质环境保护国家专业实验室,成都610059 [3]中国水电顾问集团成都勘测设计研究院,成都610072

出　　处：《地质灾害与环境保护》2007年第1期33-37,共5页Journal of Geological Hazards and Environment Preservation

基　　金：国家自然科学基金资助项目(40372136)

摘　　要：鲜水河下游流域处于鲜水河断裂带之南西,总体呈南北走向。受地层岩性、地质构造、新构造活动、河谷地貌演化及气候条件等的控制,流域内泥石流较发育,属泥石流中等发育区。泥石流以暴雨沟谷型泥石流为主,可见少量暴雨坡面型泥石流及古冰川泥石流。泥石流多集中发育于岩性相对软弱的板岩、千枚岩及砂岩与板岩互层的相对宽谷段,多为粘性泥石流。泥石流一般具有多期次发育特征,且规模逐次减小。流域内绝大部分泥石流处于停歇或衰退状态,现代活动性不活跃,现代活动泥石流频度低、规模小,且多发育于植被破坏较严重区域。流域内泥石流活动具有退化的特征,对当地人民生命安全及两河口水库的淤积等影响不大。The lower Xianshui River drainage basin is in the south west of Xianshui River fracture zone. Its strike is North- South and it is controlled by the strata and rock character,geological structure, neotectonism, the evolution of valley form and climatic conditions. Many debris flows distribute in this area, and this area is a medium debris flow distribution region. The main type of debris flow occurs in gulch by rainstorm, a small amount occurs on slope by rainstorm, and some others are coursed by glacial action. Debris flows formed concentrate in some gulch which is wide relatively and where the lithologic characters is weak relatively, such as slate, phyllite, slate interbeded with sandrock. Most of the debris flows are sticky. Generally, debris flow has the characteristic of multi--times growth, and the scale reduces gradually. In this drainage basin, most of the debris flows are closedown and declined, and the modern activity is inactive, and its frequency.is low, the scale is small, also occurs in the region where the plant cover damaged seriously. Because of such character involved, the influence to the local people＇s safety and the Lianghekou reservoir is slight.

关 键 词：鲜水河下游 泥石流 发育特征 活动性 

分 类 号：P642.23[天文地球—工程地质学]