地理研究 ›› 2001, Vol. 20 ›› Issue (1): 68-75.doi: 10.11821/yj2001010010

• 论文 • 上一篇    下一篇

黄土丘陵沟壑区人类活动对流域系统侵蚀、输移和沉积的影响

陈浩1, 蔡强国1, 陈金荣2, 金德生1   

  1. 1. 中国科学院地理科学与资源研究所, 北京 100101
    2. 中国水利水电科学研究院, 北京 100039
  • 收稿日期:2000-06-10 修回日期:2000-11-22 出版日期:2001-02-15 发布日期:2001-02-15
  • 作者简介:陈浩(1954-),男,山东鄄城人,副研究员。主要从事土壤侵蚀、流水地貌的研究,出版 专(编)著2部,发表论文60余篇。E2mail:sir chenhao@sina.com
  • 基金资助:

    国家重点基础研究发展规划项目(G1999043604);地理所知识创新工程领域前沿项目(CX10G-A00-05-02);国家自然科学基

Influence of human activities on erosion, delivery and deposit of basin system in hilly-gully loessic area

CHEN Hao1, CAI Qiang guo1, CHEN Jin ron2, JIN De sheng1   

  1. 1. Institute of Geographic Sciences and Natural Resources Reseach, CAS, Beijing 100101, China;
    2. Chinese Institute of Water Resources and Electric Power, Beijing 100039, China
  • Received:2000-06-10 Revised:2000-11-22 Online:2001-02-15 Published:2001-02-15

摘要:

从长期来看,在治理度达到70%条件下与治理前相比泥沙输移比减小50%左右,治理的效益是十分显著的。在治理的过程中,与治理前相比泥沙输移比变幅明显减小,但在短期内由于暴雨洪水侵蚀力大于工程设计标准而发生毁、垮坝或淤平后,仍可以将前期滞留的泥沙重新搬运而出现泥沙输移比大于1的情况。在黄土高原地区治理前后流域系统次暴雨泥沙输移比均可用径流深度比来定量计算获得,泥沙输移比变化的动力机制可用径流深度增与减时水流剪切力的变化来解释

关键词: 水土保持, 泥沙输移比, 水动力机制

Abstract:

From long term point of view, sediment delivery ratio of a drainage basin with a control degree reaching 70% can be reduced by around 50% in contrast to pre control conditions. The effect of erosion control is quite significant. In the management process, although delivery ratio drops considerably in comparison to pre control conditions, yet the previous retained sediment can still be carried, resulting in the situation of delivery ratio greater than 1 since erosive strength of rainstorm induced erosion is greater than project designed standard in a short spell following dike breach and scouring. In the loess plateau region, individual rainstorm event related delivery ratio under either pre or post control conditions in drainge system can be obtained by using runoff depth, and dynamic mechanism for changes of delivery ratio can be explained with shear force changes following fluctuations of runoff depth.

Key words: water and soil conservation, delivery ratio, waterpower mechanism

  • P931