Study On Measures To Protect Connections Of Dam And Shore Caused By Backward Flow Erosion

Water Conservancy hub through the water,the water level upstream,not only improve navigation conditions in upstream and can achieve many aspects such as hydro-electric-power,is access to water resources comprehensive benefits of water conservancy projects.However,in the operation of water conservancy,would inevitably alter then state of the River,the rivers flow characteristics and fluvial processes has become more complex.While,relief sluice discharged of flow will appeared some compared obviously of bad flow state,as return,and subdivided flow.It will across Po produced adverse effects,especially in connections of Dam and shore,flow section suddenly widened,flow turbulent moving sex complex,Bank easy by flow Amoy brush will directly led to buildings of damaged,directly effects integrated hub of normal run.At present mainly on navigation-power junction downstream scouring research on more connected downstream of the dam Bank banks of the recirculation zone of brushing less and studied mechanism is less,so the dam Bank connection backflow scour is of great theoretical and practical significance of the study.After sluiced is charge was observed through physical model test on flow characteristics and slope sediment phenomenon.By means of numerical simulation of flow velocity and flow field in the region and the turbulent kinetic energy distribution sand comparative analysis of two kinds of model test results,Bank junction reflux discuss mechanism of brushing,as well as measures to solve such problems,the main conclusion of the paper is as follows:(1)The model tests,sediment on slope in returning stability easier starting,while sediment incipient motion range mainly wing walls 20cm to 60cm,slope failure location is consistent with actual projects.(2)Analysis of mathematical model results,in the recirculation flow turbulence characteristics have an important impact on incipient.Sediment particles size and recirculation zone of turbulence kinetic energy before starting have a close relationship,turbulent kinetic energy distributions and Bank slope of scouring damage locations also have a close relationship,therefore,turbulence kinetic energy are important reasons that cause the dam Bank junction is back scouring.(3)Bank junction flow conditions of the dam and Bank slope geological conditions are an important factor affecting dam Bank junction is back scouring.Adjusting hub and downstream water depth,optimization of dam and junction coast slope ratio optimization measures such as dam Bank connection can improve the dam Bank junction flow conditions and allow the water to a smooth transition,stability of flow pattern.