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为深入揭示植被覆盖下坡面流阻力的内在规律,在考虑植被段前壅高和段后水深的基础上,系统研究了植被茎秆覆盖度为32.32%时6个坡度和12个流量组合下坡面流的流动特性。结果表明:在植被茎秆覆盖度为32.32%条件下,当坡度小于6°时,坡度对平均流速影响与流量相当,而坡度大于6°时,坡度对流速的影响甚微;试验过程中,壅水区水深与平均水深均随着流量增加而增大,而尾水深则略有波动;植被阻力系数随雷诺数的增加而增大,而随弗汝徳数的增加而减小,这是植被的粘滞阻力和压差阻力相互作用的结果。该成果为进一步研究植被覆盖下坡面流水动力学特性提供理论依据,进而对水土流失治理及生态修复均具有一定的指导意义。
In order to reveal the inherent law of slope flow resistance under the vegetation cover, based on the consideration of the height of the vegetation and the depth of the water after the drainage, the vegetation coverage of the stem was 32.32% and the combination of 6 slopes and 12 flows Flow characteristics of slope flow. The results showed that when the slope coverage was 32.32%, the effect of slope on the average velocity was similar to that on the slope when the slope was less than 6 °. But when the slope was greater than 6 °, the slope had little effect on the velocity. During the experiment, The water depth and average water depth of the swale increased with the increase of flow rate, but the tail water depth slightly fluctuated. The coefficient of vegetation resistance increased with the increase of Reynolds number and decreased with the increase of Froude number The result of the interaction between the viscous resistance and the differential pressure resistance of vegetation. The results provide theoretical basis for further study of hydrodynamic characteristics of slopes under vegetation cover, and thus have some guiding significance for soil erosion control and ecological restoration.