三峡库区腹地忠县小流域近52 a泥沙输移比估算研究

发布时间：2018-05-22 10:08

本文选题：泥沙输移比 + 小流域　；参考：《农业机械学报》2017年11期

【摘要】：为准确定量估算三峡库区腹地小流域近52 a泥沙输移比,为库区小流域水土保持效益评价提供科学依据,综合采用RUSLE模型、塘库淤积泥沙137Cs和210Pb定年技术分别对黄冲子和工农沟小流域1963—2014年不同时段的泥沙输移比进行了估算。结果表明:黄冲子和工农沟小流域近52 a平均土壤侵蚀量分别为119.72、86.86 t,变异系数分别为0.76、0.86;黄冲子和工农沟小流域塘库淤积泥沙的210PbexCRS模式(Constant rate of supply,CRS)的定年结果与137Cs时标基本一致,不同时段产沙量的变异系数分别为0.28、0.19;黄冲子和工农沟小流域1963—2014年的泥沙输移比均值都为0.25,不同时段泥沙输移比的变异系数分别为0.33、0.82,属于中等程度变异。本研究结果明确了泥沙输移比的估算不能割裂"时段性"这一学术认识,并为泥沙输移比的实际应用提供了借鉴。
[Abstract]:In order to estimate accurately and quantitatively the sediment transport ratio in the hinterland of the three Gorges Reservoir area in recent 52 years and to provide scientific basis for evaluating the benefit of soil and water conservation in the small watershed of the three Gorges Reservoir area, the RUSLE model is adopted synthetically. The sediment transport ratios of Huangchongzi and Gongnonggou small watersheds during 1963-2014 were estimated by 137Cs and 210Pb dating techniques respectively. The results showed that the average soil erosion amount in recent 52 years in Huangchongzi and Gunonggou small watersheds was 119.72 ~ 86.86 t, and the coefficient of variation was 0.76 ~ 0.86, respectively. The results of 210PbexCRS model of constant rate of supply and sediment accumulation in pond and reservoir of Huangchongzi and Kunonggou small watersheds were basically consistent with 137Cs time scale. The coefficient of variation of sediment yield in different periods is 0.28 ~ 0.19, the mean value of sediment transport ratio in Huangchongzi and Gongnonggou small watershed is 0.25 in 1963-2014, and the coefficient of variation of sediment transport ratio in different period is 0.33 ~ 0.82, which belongs to medium degree variation. The results of this study confirm the academic understanding that the estimation of sediment transport ratio should not be separated by "time period", and provide a reference for the practical application of sediment transport ratio.
【作者单位】：宝鸡文理学院地理与环境学院;陕西省灾害监测与机理模拟重点实验室;中国科学院水利部成都山地灾害与环境研究所;
【基金】：国家重点研发计划项目(2016YFC0402301) 国家重点基础研究发展计划(973计划)项目(2015CB452704) 宝鸡文理学院重点科研项目(ZK16063)
【分类号】：S157

【相似文献】