A case study of long-term field performance of check-dams in mitigation of soil erosion in Jiangjia stream,China |
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| Authors: | Q L Zeng Z Q Yue Z F Yang X J Zhang |
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| Institution: | (1) Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Chaoyang Area, 100029 Beijing, China;(2) Department of Civil Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, China;(3) Institute of Geomechanics, Chinese Academy of Geosciences, 11 Minzhuxueyuan Nanlu, Haidian Area, 100081 Beijing, China |
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| Abstract: | This paper examines the long-term field performance of the check-dams in mitigation of soil erosion in the Duozhao catchment
of Jiangjia stream, southwest China. Since their construction between 1979 and 1982, the check-dams have been functioning
effectively. The examination is made via comparisons between the environmental conditions of the Duozhao catchment with its
adjacent Menqian catchment in the stream, because no check dams were constructed in the Menqian catchment. The examination
is based on recent field investigations and aerial photograph analyses, and covers four aspects: (a) bed gradients of catchment
channels; (b) stability of bank slopes; (c) rates of land erosion; and (d) vegetations on bank slopes. The field data demonstrate
that the check-dams have had the following good functions for mitigation of soil erosion: (1) restricting the channel depth
and lateral erosions, (2) protecting the channel erosion base, (3) reducing the bed gradients of debris-flow channels, (4)
fixing the channel bed, (5) stabilizing the bank slopes, as well as (6) facilitating the growth of vegetations.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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| Keywords: | Check-dam Debris flow Soil erosion Environmental management Jiangjia stream Case studies |
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