Study On Permeability Characteristic Of Turf Slope Soil From Medium And Small Rivers

To solve water infiltration problems of turf slope soil from medium and small riversunder conditions of precipitation, the paper select Bermuda grass as slope grass to establishrunoff plot of41cm*29.5cm and conduct artificial simulated rainfall test and bicyclicinfiltration instrument test and after that the test results are analyzed theoretically.1.Cultivate common Bermuda grass turf and make slope grass reach the height of5cmby growing about1month.Bermuda grass is easy to manage, easy to survive,which makesthe management become saving time, effort, and efficient. Normal growth of Bermudagrass only needs the right amount of water according to wet and dry conditions of plantingsoil during the time.Artificial simulated rainfall test: establish grass slope test model of30°and45°slope, Select Bermuda grass turf as turf slope, cultivate common Bermudagrass turf and make slope grass reach the height of5cm and conducted infiltration testunder the conditions of different rainfall intensity.Tests show that infiltration rate of turfslope is apparently greater than that of bare soil slope,on the contrary,the ratio of the runoffand infiltration rate of turf slope is smaller than that of bare soil slope,this is because thatturf to some extent change the structure of the soil,form large aggregates shape around theroots, and large gap between aggregate provide flow unimpeded passage for seepage,whichimprove infiltration characteristics of slope soil;The ratio of runoff and infiltration rate islarge when steep is large,which is because that rainfall has a short residence time on theslope and more easily form the slope runoff under gravity;At the beginning of rainfall,rainfall intensity make almost no effect on the ratio of the runoff and infiltration rate,because rainfall completely convert to the infiltration and the runoff is zero, but the latterinfiltration rate is the same as the soil saturated hydraulic conductivity, remainingcompletely converted to rainfall runoff, The ratio runoff and infiltration rateinfiltration ratebecome large.2.Bicyclic infiltration test:Test used to simulate continuous rainfall and which causegrass slope catchment situation. Tests showed that: infiltration rate did not change much ondifferent slope; The initial infiltration rate and steady infiltration rates of turf soil arehigher than that of the bare soil slope soil, and at the same time, the cumulative infiltrationof the former is higher than the latter.