Study On The Effect Of Artificial Riprap In Ecological Waterway On The Habitat Of Four Major Domestic Fishes In Upstream Of Yangtze River

Riprap is widely used in waterway construction and maintenance of the upper Yangtze River channel.Under the guidance of the concept of ecological protection and sustainable development,the influence of riverbed morphology change on fish habitat after artificial rock throwing needs to be scientifically evaluated.This paper adopts a cistern model test,research analysis obtained Uneven particle size granular material sedimentation Opposite water flow structure and fish type behavior.The main conclusions are as follows :A method for continuous spatial monitoring of fish moving targets and recognition of fish moving features is developed.Through the inter-frame difference method,the fish motion video in transparent glass tank is batch processed,and the three-dimensional real-time position extraction of fish motion process is realized.The results show that the system can effectively identify the contour and trajectory of the target fish.Artificial riprap significantly affect the distribution of water flow and increases the bed resistance as well.In addition,the rubble-throwing structure also has a high water level,which reduces the flow velocity of the middle and lower layers,increases the turbulence intensity of the flow,and forms a turbulent flow structure with rapid conversion of high and low flow velocities.The larger the particle size,the more obvious the change.The change of water flow structure in riprap area has a positive impact on the anadromous behavior of fish.The flow velocity in the middle and lower layers slows down and the fluctuation of the flow velocity between the high and low layers creates suitable flow conditions for fish.Fish prefer to anadromous along on rough beds or stay in those areas.It is proved that riprap is conducive to the construction of fish habitats.