SIMULATION FOR THE IMPACT OF FLOODPLAIN WOODLAND DEVELOPMENT TO FISH HABITAT AREA
The development and utilization of the flooding area will inevitably lead to the change of the roughness of the forest in the flooding area.The floodplain is also a part of river flooding area.The decrease of the roughness of the flooding area will increase the flow rate of the river,and then reduce the usable area of the fish.Therefore,in order to provide safe place for fish avoiding risk and to protect the effective habitat area,it is necessary to study the impact of the development of the floodplain on fish.In this paper,River2D software is used to simulate the fish habitat weighted usable area (WUA) corresponding to different floodplain roughness under a certain frequency flood condition,and to analyze the effect of changing roughness on river fish habitat.The results show that with lower floodplain roughness,weighted usable area (WUA) decreases gradually,amplitude of changes about WUA in floodplain range is relatively large,and the characteristics of floodplain significantly affect fish habitat area.The felling of vegetation in flooding area will reduce the area of fish habitat,so it should prevent the excessive development of flood and protect the ecological environment of the river.