冻融坡面土壤剥蚀率主要影响因素分析

发布时间：2018-01-04 00:31

本文关键词：冻融坡面土壤剥蚀率主要影响因素分析　出处：《水土保持研究》2016年02期 　论文类型：期刊论文

【摘要】：为确定冻融坡面影响土壤剥蚀率的主要因素,采用2个(10°,15°)坡度、2个(3L/min,9L/min)流量和4个(2cm,5cm,8cm,11cm)起始解冻深度组合进行野外冲刷试验,运用灰色关联分析、模糊贴近度分析和通径分析方法,分别分析了各因素对土壤剥蚀率的影响作用。结果表明:流量与土壤剥蚀率的灰色关联度最大,坡度次之;水流功率与土壤剥蚀率的模糊贴近度最大,流量、起始解冻深度的模糊贴近度均大于坡度;水流功率对土壤剥蚀率的决定作用最大,起始解冻深度次之,水流剪切力通过其他因素对土壤剥蚀率的间接作用最大;三种方法分析结果表明水流功率、流量、起始解冻深度、坡度是影响土壤剥蚀率的主要因素。
[Abstract]:In order to determine the main factors affecting soil erosion rate on freeze-thawing slope, the slope was 2 10 掳/ 15 掳), the flow rate was 3 L / min (9 L / min) and 4 / 2 cm ~ (-1) 5 cm ~ (-1). The initial thawing depth combination was used for field scour test, grey correlation analysis, fuzzy closeness analysis and path analysis were used. The effects of various factors on soil erosion rate were analyzed respectively. The results showed that the grey correlation degree between flow rate and soil erosion rate was the largest and the slope degree was the second. The fuzzy closeness between water power and soil erosion rate is the largest, and the fuzzy closeness of flow rate and initial thawing depth is higher than that of slope. Water power has the most important effect on soil erosion rate, followed by initial thawing depth, and flow shear force has the most indirect effect on soil erosion rate through other factors. The results of three methods showed that water power, flow rate, initial thawing depth and slope were the main factors affecting soil erosion rate.
【作者单位】：沈阳农业大学水利学院;
【基金】：国家自然科学基金(41471225) 辽宁省农业领域青年科技创新人才培养计划(2014054)
【分类号】：S157.1
【正文快照】： 坡面产沙是一个高度非线性动态过程,受到多个因素的影响作用,土壤侵蚀量与水动力学特征参数相关性显著[1]。Lyle和Smerdon[2]首次通过水槽试验,对土壤分离速率与水流剪切力间的关系进行了研究;Nearing等[3]通过变坡水槽试验发现土壤剥蚀率与水深、坡度呈对数相关关系,坡度对土

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