Advances in Earth Science ›› 2011, Vol. 26 ›› Issue (12): 1269-1275. doi: 10.11867/j.issn.1001-8166.2011.12.1269

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Control and Restoration of Debris Flow Gully near the City: A Case Study of Shengou Creek

Zhang Kang 1, Wang Zhaoyin 1, Yu Guoan 2, Han Lujie 1   

  1. 1.State Key Laboratory of Hydro-science and Hydropower Engineering, Tsinghua University,Beijing100084,China;
    2.Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101,China
  • Received:2011-06-14 Revised:2011-10-09 Online:2011-12-10 Published:2011-12-10

Zhang Kang, Wang Zhaoyin, Yu Guoan, Han Lujie. Control and Restoration of Debris Flow Gully near the City: A Case Study of Shengou Creek[J]. Advances in Earth Science, 2011, 26(12): 1269-1275.

 In order to study the effects of engineering measures in controlling debris flow gullies, experiences of debris flow control at Shengou Creek (a tributary of Xiaojiang River in the city of Dongchuan, Yunnan province) are summarized based on field experiments and history of debris flow and debris flow control. Due to dams construction and reforestation in Shengou Creek, step-pool systems were developed, which increased roughness of riverbed and dissipated the kinetic energy of debris flow (riverbed structure intensity Sp was over 0.3). Riverbed was protected from incision which made the bank and slope stable. Furthermore, reforestation increased the vegetate cover, which could not only control the slope erosion and decrease the sediment yield, but also  supply suitable condition for developing step-pool systems to maintain a good river ecosystem. Subsequently, the stream became stable and stepped into a virtuous circle. Shengou Creek, as a debris flow gully before, becomes a forest park now. Accordingly, the river management of integrate check dams with step-pool systems is the near nature control which combine the aims of debris flow control, beautiful landscape and good river ecosystem supply together. The integrated management of check dams and step-pool systems supplies a new model for mountain streams control. However, over-harnessing  a river would destroy the step-pool systems which lead to the loss of landscape and ecology.

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