| 坡面流水力学参数对团聚体剥蚀程度的定量影响 |
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| 引用本文： | 王军光,李朝霞,蔡崇法,王玉华,张国彪,马仁明.坡面流水力学参数对团聚体剥蚀程度的定量影响[J].水科学进展,2012,23(4):502-508. |
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| 作者姓名： | 王军光 李朝霞 蔡崇法 王玉华 张国彪 马仁明 |
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| 作者单位： | 1.华中农业大学水土保持研究中心, 湖北武汉 430070; |
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| 基金项目： | 国家自然科学基金资助项目(40930529;41001164)~~ |
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| 摘 要： | 土壤团聚体作为径流搬运过程中的基本结构单元,其在径流运移中的剥蚀破坏影响着坡面径流入渗状况、泥沙含量及地表侵蚀过程的强度。利用变坡试验水槽,在不同流量(0.4~1.2 L/s)和坡度(8.8%~46.6%)范围内,详细分析了流量、坡度、径流水深和阻力系数对鄂南两种典型母质发育红壤团聚体剥蚀破坏的定量影响。研究结果表明,流量和坡度对两种母质发育红壤团聚体的剥蚀影响都是极显著的,坡度对两种红壤团聚体的剥蚀破坏影响均大于流量;不同流量和坡度组合下的团聚体剥蚀破坏变化规律不同,利用流量和坡度的幂函数可以准确地预测团聚体剥蚀程度;在两种水力学参数之间,团聚体剥蚀程度随着径流水深的增加而降低,随着阻力系数的变大剥蚀程度增加。
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| 关 键 词： | 坡面流 水力学参数 径流水深 阻力系数 团聚体 |
| 收稿时间： | 2011-08-15 |
Quantitative effects of hydro-dynamic parameters on abrasion extent aggregates by overland flow |
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| WANG Jun-guang
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LI Zhao-xia
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CAI Chong-fa
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WANG Yu-hua
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ZHANG Guo-biao
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MA Ren-ming.Quantitative effects of hydro-dynamic parameters on abrasion extent aggregates by overland flow[J].Advances in Water Science,2012,23(4):502-508. |
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| Authors: | WANG Jun-guang LI Zhao-xia CAI Chong-fa WANG Yu-hua ZHANG Guo-biao MA Ren-ming |
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| Affiliation: | 1.Research Center of Water and Soil Conservation, Huazhong Agricultural University, Wuhan 430070, China;2.Yichang Fuqiang Engineering Company Limited, Zigui 443611, China |
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| Abstract: | The aggregate is the fundamental structural unit of a soil.The destruction of a soil aggregate that is transported by overland flow may significantly affect the surface runoff and permeability of soils,sediment content and the general erosion intensity.Experiments were performed in a hydraulic flume with varying slope in flow discharge(0.4-1.2 L/s) and slope gradient(8.8%-46.6%) to investigate the quantitative effects of discharge,slope,flow depth and friction factor on the abrasion extent of red soil aggregates from two parent materials.The results indicated that the effect of discharge and slope on red soil aggregates abrasion extent from two parent materials were both significant,and the effect of slope were greater than discharge.The change regularities of aggregates abrasion extent were not the same at the different combination of discharge and slope.The results of this study suggested that the power function of the discharge and slope was the best equation for predicting the aggregates abrasion extent.The aggregates abrasion extent was decreasing with increasing flow depth and they were increasing with increasing friction factor. |
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| Keywords: | overland flow hydro-dynamic parameters flow depth friction factor aggregate |
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