雨季不同时段蒋家沟泥石流侵蚀产沙特征的分析  

Analysis of the Character of Eroded Sediment for Debris Flow in Different Periods of Rainy Season

作　　者：王裕宜[1,2] 詹钱登[3] 洪勇[1,2] 田冰[4] 邹仁元[2] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,中国科学院东川泥石流观测研究站,四川成都610041 [2]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 [3]台湾成功大学水利及海洋工程系,中国台南701013 [4]河北师范大学资源与环境科学学院,河北石家庄050016

出　　处：《水土保持学报》2008年第6期1-6,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金(40671026)

摘　　要：根据雨季不同时段,降雨入渗后的土壤含水状况观测以及泉水季节性变化,详细分析了蒋家沟1987-2001年雨季不同时段的167场泥石流侵蚀产沙的特点。结果表明:在雨季中期(7-8月),无论是泥石流暴发频率、产沙量还是规模都是最高值,分别占总样本的70.65%和占总产沙量的78.88%。雨季初期(5-6月)和雨季后期(9-10月)的泥石流,分别占总产沙量的16.16%和4.97%。雨季初期5月的雨沙比(R/s,mm/万m3)高达82.26,6月为3.49;而雨季中期的7月R/s仅为1.32,8月为1.67。这一研究可提高雨季不同时段泥石流降水警戒值确定的精度。The character details in eroded sediment of debris flows are analyzed in this article, which is through debris flow in different periods of rainy season occurrence in 167 events from 1987 to 2001, according to observation of different soil moisture status after rainfall Infiltration and season change of fountain. Ana- lyzed results indicated that they are the maximum for whether frequency , sediment quantity and sediment yield scale of debris flows in the middle of rainy season , which are account for 70.65% in total events, 78.88% in total sediment respectively. They are account for 16.16% and 4. 97% in all sediment quantity respectively for debris flows in early （May--June） and evening periods （September--October） of rainy season. The ratio of rainfall to sediment（ R/s value ,mm/万 m^2）at May is high 82.26 in early period of rainy season, and the R/s value in June is 3, 29 , but the R/s value in July is only 1.32 and one in August is 1.67 respectively. The research can advance the precision for the rainfall watched value to determinate of debris flow forecast in different period of rainy season.

关 键 词：雨季时段 泥石流 产沙规模 雨沙比 

分 类 号：P642.23[天文地球—工程地质学]