Study on the characteristics of runoff and sediment yielding and hydrodynamic parameters on the construction roads of transmission and transformation project
[Objective]The scattered distribution of power transmission and transformation construction roads,with a high degree of mechanization and high difficulty in soil erosion control,have become typical geomorphic units of engineering soil erosion,po-sing a serious threat to the ecological environment.[Methods]Select two typical construction roads,including soil hardening and soil disturbance,as the research objects,and uses the original slope as control.Conducting a study on the characteristics of run-off,sediment,and hydrodynamic parameters of construction roads under different discharge flow conditions through field water erosion tests,and quantify the critical values of erosion dynamics for different construction roads.[Results]The result showed:(1)The cumulative runoff volume and sediment yield amount of the soil hardening and soil disturbance slope surfaces,which caused by construction disturbance,increased by 9.66%～141.56%and 123.77%～1822.39%,respectively,compared to the original slope surface.The stable runoff rate and sediment yield rate increased by 1.28～1.30 times and 2.39～3.00 times,respectively.They showed a significant linear relationship(R2>0.90)between the sediment with runoff on the construction road and the original slope.The stable sediment yield rate on the hardened soil slope was 25.34%higher than that on the disturbed soil slope,but the difference in stable runoff rate was only 2.17%.(2)The stable runoff rates and sediment yield rates change from soil hardening<soil disturbance to soil disturbance<soil hardening,as the discharge flow reaches 15 L/min.There were criti-cal values for the runoff and sediment production characteristics of the two types of power transmission and transformation con-struction roads.(3)The stable flow velocity of soil hardening and soil disturbance slopes increased by 59.95%and 39.77%compared to the original slope,respectively,while the critical runoff shear force decreased by 86.66%and 75.87%,and the critical runoff power decreased by 68.29%and 34.85%,respectively.The runoff power could be better used as a characteriza-tion parameter for erosion compared to the runoff shear force.[Conclusion]The research result provide scientific guidance for revealing the internal mechanism of road erosion during power transmission and transformation construction,as well as for subsequent ecological restoration.It is also necessary to consider the catchment conditions when designing soil and water conser-vation measures for different construction roads.
construction roads of transmission and transformation projectrunoff and sediment yieldinghydrodynamicrunoff-sediment relationshipinfluence factor
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