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| 非恒定流对浅沟侵蚀产沙及水动力参数的影响 | |
| 引用本文： | 李宏伟,王文龙,车小力,郭军权.非恒定流对浅沟侵蚀产沙及水动力参数的影响[J].中国水土保持科学,2011,9(6):14-21. |
| 作者姓名： | 李宏伟 王文龙 车小力 郭军权 |
| 作者单位： | 1. 西北农林科技大学资源环境学院,712100,陕西杨凌 2. 西北农林科技大学资源环境学院,712100,陕西杨凌;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,712100,陕西杨凌 3. 延安职业技术学院,716000,陕西延安 |
| 基金项目： | 国家自然科学基金“黄土丘陵区坡面浅沟侵蚀过程及预报模型研究”(40471080); 黄土高原土壤侵蚀与旱地农业国家重点实验室专项经费“全坡面土壤侵蚀过程及其防治研究”(10502-Z5-3) |
| 摘 要： | 浅沟侵蚀是黄土高原独特的侵蚀类型,在坡面侵蚀中占有重要的地位。关于浅沟侵蚀的研究,以往多采用恒定流量进行冲刷试验,而在实际中流量是变化的,有关非恒定流的浅沟侵蚀实验尚未见报道。采用野外放水冲刷试验,定量分析10～15、15～20、20～25 L/min 3个非恒定流的放水流量级和10、15、20 L/min 3个恒定流量的放水流量级对14°坡耕地坡面浅沟侵蚀产沙及其水动力参数的影响。结果表明:恒定流量级的流速、雷诺数、弗劳德数、剪切力、水流功率和径流含沙量分别较变流量后的非恒定流小6.64%～13.44%、2.73%～8.26%、6.15%～49.59%、0.27%～10.27%、4.27%～15.77%和2.02%～19.36%;恒定流的阻力系数则较与其相对应的非恒定流增大23.45%～43.41%。 |
| 关 键 词： | 浅沟侵蚀 非恒定流 产沙 水动力参数 |
Effects of non-state discharge on ephemeral gully erosion sediment and hydraulic parameters |
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| Li Hongwei,Wang Wenlong,Che Xiaoli,Guo Junquan.Effects of non-state discharge on ephemeral gully erosion sediment and hydraulic parameters[J].Science of Soil and Water Conservation,2011,9(6):14-21. | |
| Authors: | Li Hongwei Wang Wenlong Che Xiaoli Guo Junquan |
| Institution: | Li Hongwei1,Wang Wenlong1,2,Che Xiaoli1,Guo Junquan3(1.College of Resources and Environment,Northwest A&F University,712100,Yangling,Shaanxi,2.China National Lab.of Soil Erosion and Dryland Agriculture on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,3.Yan'an Vocational and Technical College,716000,Yan'an,Shaanxi:China) |
| Abstract: | The ephemeral gully erosion occupies an important position in the loess plateau erosion.The previous studies on ephemeral gully erosion always do scour experiment under constant flow rate condition.However,under practical conditions,the flow is changing.Few studies are conducted on non-state water flow.We analyzed the effects of non-state discharge on ephemeral gully erosion sediment and hydraulic parameters on plow land of the slope of 14°.Three non-state water flow rates（10-15,15-20,20-25 L/min） and three constant water flow rates（10,15 and 20L/min） were designed in the experiment.Results indicated that compared to the non-state discharge,flow velocity and Reynolds number,Froude number and Shear force,stream power and runoff sediment rate of the constant water flow decreased by 6.64%-13.44%,2.73%-8.26%,6.15%-49.59%,0.27%-10.27%,4.27%-15.77% and 2.02%-19.36% respectively;and the Daycy-weisbach coefficient increased by 23.45%-43.41%. |
| Keywords: | ephemeral gully erosion non-state discharge sediment yield hydrodynamic parameters |
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