摘要
运用1 37Cs示踪法调查云南东川小江流域 6条泥石流沟、6条非泥石流沟和主河的泥沙来源。泥沙主要来源于冲沟侵蚀和滑坡崩塌堆积、坡耕地和草地。坡耕地和草地表层土壤1 37Cs平均含量分别为 0 9Bq m2 和1 98Bq m2 ,冲沟沟壁和滑坡崩塌堆积土体1 37Cs。作者通过 3种源地土体1 37Cs含量的比较 ,分析了细粒泥沙(<0 0 1mm)的来源。 6条泥石流沟冲沟侵蚀和重力侵蚀 (滑坡崩塌 )的相对产沙量变化于 90 2 %～ 1 0 0 % ,平均值为 95 1 % ,6条非泥石流沟的相对产沙量变化于 74 5 %～ 83 3% ,平均值为 78 9%。小江主河为 81 4 %。
Sediment sources of 6 debris flow gullies, 6 non_debris gullies and the main Xiaojiang River were investigated by using the 137 Cs tracing technique. Gully erosion and mass movement products, sloping cultivated land and grass land were the major sediment sources in all the gullies of the Xiaojiang River basin. The average 137 Cs contents of the soils on the cultivated sloping lands and on the grass land were 0 9 and 1 98 Bq/m 2 (<0 01mm) , respectively, while the gully erosion and mass movement products contain no 137 Cs. By comparing the 137 Cs contents of the three types of source soils, the relative contribution of the mass movement and gully erosion products to the fine sediment (<0 01mm) varied between 90 2%～100% with a mean value of 95 1% for the 6 debris flow gullies, while it varied between 74 5%～83 3%, with a mean value of 78 9% for the 6 non_debris flow gullies and was 81 4% for the main Xiaojiang River.
出处
《泥沙研究》
CSCD
北大核心
2003年第4期52-56,共5页
Journal of Sediment Research
基金
中国科学院泥石流重点基金
知识创新工程项目 (KZCX_SW_3 19)资助
关键词
云南
东川
非泥石流沟
^137CS
debris flow gully
non_debris flow gully
137 Cs tracing technique
sediment source
