Study on Ecological Design of Low-Head Dams(Weirs)
In the training works of small and medium-sized rivers,low-head dams(weirs)generally have the problems of excessive damming,prioritizing social functions over ecological functions,and insufficient ecological considerations,which leads to new contradictions in river evolution.Combined with the ecological effects of permeable dams and flexible sand-retaining dams,the ecological design concept of weak action is put forward.A nonlinear multi-objective function is established to coordinate the social function and ecological functions of river and dam(weir)project.According to this concept and method,the traditional dam(weir)structure is modified from solid design to open design,with various types such as semi-damming,perforated,comb-tooth,and net-pile dam.Particularly,the new structure type of small check dam in the Loess Plateau can better maintain the gully environment and overcome the constraints of dam construction in stepped terrains.The weak action and related structures have reference value for ecological design of other hydraulic structures.
low-head dam(weir)ecological functionweak actioncoordination functioncheck dam
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