Influence of Slag Disposal Disturbance on Runoff and Sediment Yield in Mountain Meadow of Eastern Xizang
[Objective]The aims of this study are to elucidate the response of soil and water loss resulting from slag dumping engineering disturbances during railway construction,and to unveil the impact of slag accumulation and vegetation restoration on soil and water loss at a slope scale in the ecologically fragile mountain meadow region of eastern Xizang.[Methods]Four slope types such as undisturbed,mildly disturbed,severely disturbed,and disturbed then covered with soil restoration were selected.The in-situ runoff plots were established.The process of sediment production and loss on slope was monitored by artificially simulated rainfall experiment.[Results](1)The quantity of spattering on the slope increased with the intensity of disturbance,with the amount on the downhill side being approximately 1.14 to 2.67 times greater than that on the uphill side.(2)The initial flow generation time for the lightly disturbed slope,heavily disturbed slope,and covered slope reduced from 53.8％to 66.7％,34.6％to 46.7％,and 86.7％to 92.9％,respectively.(3)The flow production rates for the undisturbed slope,lightly disturbed slope,heavily disturbed slope,and covered slope ranged from 44 to 86 ml/(min·m2),104 to 147 ml/(min·m2),200 to 373 ml/(min·m2),and 46 to 95 ml/(min·m2),respectively.The sediment production rates ranged from 0.026 to 0.055 g/(min·m2),0.05 to 0.098 g/(min·m2),1.034 to 2.189 g/(min·m2),and 0.047 to 0.077 g/(min·m2),respectively.[Conclusion]The soil and water conservation capacity of the restored slope has been significantly improved in comparison to the lightly disturbed and heavily disturbed slopes.However,there still exists a disparity between the undisturbed slope and the covered slope.Therefore,additional vegetation or engineering measures need to be implemented to restore the disturbed slope effectively.
process of runoff and sedimentsoil and water lossartificial rainfall simulationalpine meadowspoil disposal engineering
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