摘要
泥沙输移比对正确评价水土保持减沙效益具有重要意义。以三峡库区菱角塘小流域为研究对象,在应用137Cs示踪技术测定塘库和谷地泥沙沉积量的基础上,计算了小流域1963-2013年土壤侵蚀量和泥沙输移比,并讨论了采用不同侵蚀量算法计算的小流域泥沙输移比差异特征。结果表明:菱角塘小流域塘库和谷地水稻田泥沙沉积量分别为1 835.75 t和3 781.80 t;基于本文的测定法、常用的插值法和模型法计算的小流域土壤侵蚀量分别为5 821.52 t、7 240.50 t和10 504.25 t;不同侵蚀量算法计算的菱角塘小流域泥沙输移比差异明显。应用本文提出的137Cs测定塘库和谷地泥沙沉积量的测定法,计算的库区小流域土壤侵蚀量和泥沙输移比相对合理可靠,具有一定的参考价值。
Sediment delivery ratio is critical in evaluating sediment yield reduction caused by soil and water conservation. The Lingjiao Pond small watershed in the central area of the Three Gorges Reservoir was investigated. Soil erosion amount and SDR were calculated on the basis of pond and paddy fields deposition determined by 137Cs tracing technique for 1963-2013 years. Difference characteristics were proposed for SDR with three types of soil erosion amount estimation. Results showed that deposition amounts in pond and paddy fields in the study area was 1,835. 75 t and 3,781. 80 t,respectively. Soil erosion amount estimated by determination,interpolation as well as model method was 5,821. 52 t,7,240. 50 t and 10,504. 25 t,respectively. SDR for 1963-2013 years in the small watershed differed apparently when different soil erosion amount estimation was utilized. Results of soil erosion amount and SDR were reliable with application of the determination method(valley and pond sedimentation amount determined by 137Cs technique) proposed in this study.
作者
俱战省
严冬春
文安邦
张加兵
JU Zhan-sheng;YAN Dong-chun;WEN An-bang;ZHANG Jia-bing(Shannxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, College of Geography and Environment, Baoji University of Arts and Sciences, Baoji 721013, China;Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;Soil and water conservation bureau of the Wanyuan city, Dazhou 636350, China)
出处
《泥沙研究》
CSCD
北大核心
2018年第2期67-72,共6页
Journal of Sediment Research
基金
中科院STS项目(KFJ-SW-STS-175)
国家重点研发计划项目(2016YFC0402301)
宝鸡文理学院校级重点项目(ZK16063)
关键词
泥沙输移比
小流域
137Cs
泥沙平衡
土壤侵蚀量
sediment delivery ratio
small watershed
137Cs
soil budget balance
soil erosion amount