Decrease in ecological damage of water throughput tubular transitions on spawning

Abstract

Intensive growth of traffic demands decrease in negative impact of water throughput constructions on ecology. Conditions of the correct installation of the tubular transitions made from steel corrugated elements (MCE) on spawning waterways which performance will allow to ensure ecological safety at movement of fish are defined. Recommendations about the organization of overcoming by fishes of difference and a velocity pressure when moving in MCE culverts are made. The obtained data on speed on a transit part of a water throughput construction are of interest at problem solving on easy access of fishes through culverts to up-stream and design of culverts. Results of pilot hydraulic studies of MCE pipes of round shape according to depths and speeds are presented on an outlet from a pipe for different operating modes, at existence and lack of a protective tray in a ground part of pipes with helical (HC) and a normal (NC) form of a corrugation. It is established that if 10% of cross sectional area of a corrugated pipe are occupied with stone dumping, then flow rate is reduced approximately by 10-12%. Based on results of laboratory researches and published materials, data for assessment of value of roughness coefficients of composite section of a round culvert in the form of one-point transition are provided and the targets of future researches on melioration of culverts are planned. Received results can be used at hydraulic calculations and optimization of water throughput designs in nature protection and also highway engineering.