植被缓流效果试验研究

发布时间：2018-06-30 06:51

本文选题：坡面流 + 模拟植被覆盖度　；参考：《泥沙研究》2017年02期

【摘要】：为深入研究植被减流减沙特征及对流域水土保持效益的影响,本文通过5个覆盖度,6个坡度和7个流量的组合条件下的室内放水试验,系统研究了植被对坡面水流的缓流特征。结果表明:随着植被覆盖度增加,植被对坡面水流的阻滞作用逐渐凸显,即缓流系数减小,缓流效果增强,当植被覆盖度大于4.650%时,缓流效果趋于稳定。在试验流量范围内,缓流系数随流量的增加呈现逐渐减少的趋势,而随坡度的增加略有增加。缓流系数随水深和雷诺数增加而减小,而与弗劳德数呈反C型分布。最后,建立了基于试验控制变量(植被覆盖度,流量和坡度)的缓流系数预测公式。
[Abstract]:In order to study the characteristics of vegetation flow and sediment reduction and its effect on the benefit of soil and water conservation in the watershed, this paper systematically studied the slow flow characteristics of vegetation on slope water flow through indoor discharge experiments under the combination of 5 coverage degrees, 6 slopes and 7 discharge rates. The results showed that with the increase of vegetation coverage, the blocking effect of vegetation on slope water flow was gradually prominent, that is, the slow-flow coefficient decreased, and the slow-flow effect increased. When the vegetation coverage was greater than 4.650, the slow-flow effect tended to be stable. In the range of experimental flow, the slow-flow coefficient decreases gradually with the increase of flow rate, but increases slightly with the increase of slope. The slow-flow coefficient decreases with the increase of water depth and Reynolds number, but is inversely C-shaped with Froude number. Finally, the prediction formula of slow flow coefficient is established based on experimental control variables (vegetation coverage, flow rate and slope).
【作者单位】：西北农林科技大学水利与建筑工程学院;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金资助项目(51579214;41001159) 流域水循环模拟与调控国家重点实验室开放基金(IWHR-SKL-2014) 黄土高原土壤侵蚀与旱地农业国家重点实验室主任基金(A314021402-1619)
【分类号】：S157

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