Hydrodynamic Characteristics Of Plant Flexible Dam Based On Experiment

Hydrodynamic characteristics and some preliminary theories ofgully flow with plant flexible dam are studies based on physical model in thispaper. Firstly, the problems of flow with plant are systematically concluded .According to variations of two-dimensional flow after planted flexible dam,four districts along longitude are divided : inlet district, backwater district, plantdam district and recovery district, so as to more directly understand main reasonof sediment retention of plant flexible dam. Flow boundary factors such asbottom slope, roughness and plant factors such as length and density of dam areanalyzed to find how these factors effluence on the effect of sedimentretention of plant dam. Then better type of plant dam is selected based oncomparison of different type of dam. Resistant formula of plant dam accordingto the actual flow though dam are deduced and formulas about backwater lengthbefore plant dam and reasonable dam space are also deduced which are testifiedby experiment results. Finally, mathematical model of two-dimensional flowthrough vegetation are established.