川西地区低频率泥石流的特征  

Characteristics of Low-frequency Debris Flow in Mountain Area of Western Sichuan Province

作　　者：林明安[1,2] 王士革[1] 范晓岭[3] 卢铖昀 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [2]中国科学院研究生院资源与环境学院,北京100049 [3]北京城建勘测设计研究院有限责任公司,北京100101 [4]中国土木工程集团有限公司,北京100038

出　　处：《水土保持通报》2010年第1期227-231,共5页Bulletin of Soil and Water Conservation

基　　金：水利部公益性行业科研专项经费"岷江上游滑坡泥石流溃坝洪水监测与防御"(200801032);国家自然科学基金项目"非集中固体物质补给的低频率泥石流形成机理研究"(40871054)

摘　　要：泥石流按其暴发频率分为高频率(每年发生一次或多次)、中频率(数年至30a发生一次)和低频率(30a以上发生一次)泥石流3类。低频率泥石流具有暴发周期长,规模大,危害严重等基本特点。选取川西地区不同频率的泥石流沟道进行对比研究,结果表明,该区低频率泥石流还具有两个典型特征:低频率泥石流流域具有植被覆盖度高,不良地质现象数量少且规模小的特点;低频率泥石流在侵蚀过程中以沟床冲刷为主且侵蚀速度快,泥砂输移比高。关于低频率泥石流上述两点特征的研究,对泥石流的预防和治理有重要指导意义。Debris flow can be divided into three types according to its outbreak frequency： high-frequency （one or many times in a year）, medium-frequency （one time in several to 30 years）, and low-frequency （one time in more than 30 years）. Low-frequency debris flow often burst fiercely without any anticipation and cause serious harm. Based on the analysis of the data from debris flow gullies with different outbreak frequencies, the characteristics of low-frequency debris flow are summarized. Watersheds with Low-frequency debris flow are characterized by high vegetation coverage and a small number and small-scale of adverse geo- logical phenomena. The groove bed scour of low-frequency debris flow is dominant and erosion rate and sediment transport capacity are high. Understanding the characteristics of low-frequency debris flow has important significance in guiding debris flow prevention.

关 键 词：泥石流 低频率 特征 川西地区 

分 类 号：P642.23[天文地球—工程地质学]