Experimental Study On Sediment Carrying Capacity Of Flow On Brown Soil Slope

The main reason for soil erosion is that the sediment carrying capacity of flow increases with the change of environmental factors.Under the action of sediment carrying capacity,soil slides.Therefore,it is of great significance and role to explore the relationship between flow sediment carrying capacity of brown soil and relevant influencing factors,to control sediment carrying capacity in areas where brown soil is widely distributed and to predict soil erosion in time.In order to determine the relationship between flow sediment carrying capacity and its main factors on slopes,brown soil was taken as the research object in this study.Three slopes(3°,6°,9°),four flows(0.35 L/s,0.45 L/s,0.55 L/s,0.65 L/s)were used to carry out flume scouring tests.The main factors affecting flow sediment carrying capacity were determined by grey correlation analysis and fuzzy pasting schedule.Stepwise regression analysis is used to determine the relationship between sediment carrying capacity and its influencing factors.The main results obtained are as follows:(1)Characteristic of sediment carrying capacity changing with time: The initial time of sediment carrying capacity of flow has a great relationship with slope and discharge.The longer the slope is,the longer the sediment carrying capacity of flow is,and the longer the sediment carrying capacity of flow is,the more complex the relationship between sediment carrying capacity of flow and discharge is.The sediment carrying capacity shows an increasing trend in the test time interval,but there are certain fluctuations.(2)The grey correlation degree of discharge,slope,velocity,Reynolds number,Froude number,drag coefficient,flow shear stress,unit stream power,stream power and sediment carrying capacity is calculated.It is concluded that the grey correlation degree of velocity and sediment carrying capacity is the largest,and the influence degree of other influencing factors on sediment carrying capacity is as follows: velocity>Froude numberdischarge> flow shear stress >stream power>unit stream power > slope >Reynolds number>drag coefficient.(3)Based on the analysis of discharge,slope,velocity,Reynolds number,Froude number,drag coefficient,flow shear stress,unit stream power,stream power and sediment carrying capacity,the influence degree of influence factors on sediment carrying capacity is as follows: velocity > Froude number >stream power > unit stream power > flow shear stress> discharge > slope >Reynolds number >drag coefficient.(4)According to the results of grey correlation analysis and fuzzy closeness analysis,discharge,slope,velocity,Froude number,flow shear stress,unit stream power and streampower are determined as the influencing factors of sediment carrying capacity in this study.The prediction equation of sediment carrying capacity based on velocity,flow shear stress and unit stream power is determined by stepwise analysis method.(5)The velocity,flow shear stress and unit stream power are analyzed by path analysis.The order of influencing factors of sediment carrying capacity was obtained as follows:velocity > unit stream power > flow shear stress.Finally,combined with grey correlation analysis,fuzzy proximity analysis,stepwise regression and path analysis,the optimal model prediction equation is determined as follows:Tc=263.488+604.965V+1173.386P-7.978?(R~2=0.986)...