Study On Hydraulic Characteristics Of The New Type Ecological Revetment Structure

Revetment engineering is to protect the soil bank slope against damage from water scouring and stability of river regime is an important waterway regulation engineering measures,at the same time,the area of the zone is the interaction between land and sea borders,is land ecological system and river ecological system of energy,material and information exchange is an important place.In bank protection technology of the future more considering the harmonious development of social economy and ecological environment,using ecological engineering technology riverbank protection for revetment engineering development new trend.Ecological revetment in addition to the basic function of revetment engineering,also played the beautify the environment,enhance the capacity of water self-purification,the role of protecting the integrity of the ecosystem.Therefore,put forward a new eco-type revetment structure and the constant flow under the action of revetment structure before and after the flow in the vicinity of the bank slope revetment structure and turbulence characteristics,for the management of river bank slope and protection is of great importance.Central public welfare scientific research institutes,this paper special fund project"new eco-type revetment engineering structure research",put forward two new eco-type revetment structure and the design ideas and design parameters,and through the sink,a generalized model test research for eco-type revetment structure hydraulic characteristics near the bank,and theoretically reveals the mechanism of water and sediment dynamics of river bank slope erosion destruction.The main research results are as follows:?Original information collection,analysis of the current trend of the development of the inland waterway revetment engineering technology at home and abroad,including traditional revetment engineering technology and the research situation of the ecological revetment engineering technology,and figure out its applied conditions,materials and types structure;?Analysis of the middle and lower reaches of the Yangtze river and water features,the morphological characteristics of the typical bank slope of nut reefs block revetment and diamond reefs block revetment,and it is concluded that two kinds of ecological revetment structure and the design parameters,structure physical model and flow model test parameters;?In consideration of ecological function,economic rationality of reefs block and the degree of construction difficulty,according to the fish swimming grams of flow velocity,water dynamics simulation software Fluent is used to calculate flow field around reefs block,find two fish reef block arrangement spacing,determine the arrangement of ecological revetment structure;?The analysis of the bank protection mechanism of ecological revetment structure,and a flume model tests for the ecological revetment structure near the bank slope under the condition of water flow structure and turbulence characteristics.Overall,the proposed two new ecological revetment structure on the effects of a whole area water level;Of slope slot near the boundary flow reduction effect is good,produce the phenomenon such as flow,turbulent flow,consume more energy,reduce bank slope pulsation kinetic energy obviously,at the same time section shear force distribution,again confirm revetment block bottom protection effect on promoting sedimentation;Nut revetment blocks of impingement slowing effect better than the diamond revetment blocks.