基于RUSLE的北洛河上游流域侵蚀产沙模拟研究

发布时间：2018-03-05 02:38

本文选题：土壤通用流失方程　切入点：泥沙输移分布模型　出处：《水土保持学报》2017年04期 　论文类型：期刊论文

【摘要】：以RS、GIS和RUSLE模型结合SEDD模型,分析了退耕还林前后北洛河上游流域1990年、2000年和2010年土壤侵蚀强度和产沙量的时空变化特征。结果表明:3个时期年平均土壤侵蚀模数分别为18189.72,7 408.93,2 857.76t/(km~2·a),年均输沙模数分别为14 093.31,5 997.65,2 394.37t/(km~2·a),均呈减小趋势。3个时期的土壤侵蚀量在地形上的分布表现出趋同性,即高程上均在1 475~1 575m内平均侵蚀模数和侵蚀量表现出最大值。随着坡度增加,平均侵蚀模数增加,流域内75%以上的侵蚀量均来自于坡度15°区域。3个时期平均侵蚀模数均遵循阳坡半阳坡半阴坡阴坡的规律。研究为该区域生态环境建设效益评价及水土资源合理利用提供有益信息。
[Abstract]:The SEDD model is combined with RSGIs and RUSLE model. The temporal and spatial variation characteristics of soil erosion intensity and sediment yield in the upper reaches of North Luohe River before and after returning farmland to forestry on 1990, 2000 and 2010 were analyzed. The results showed that the average annual soil erosion modulus was 18189.72 / 7 408.93 / 7 857.76 t / s / m ~ (2) / a / a, and the average annual sediment transport modulus was 18189.72 / 77.76 t / m / a, respectively. The distribution of soil erosion in the three periods was similar to that of topographic distribution, which was 14 093.31 / 5997.65t / 2 394.37 t / s / m ~ 2 路a ~ (-1), respectively, and showed a decreasing trend, and the distribution of soil erosion in the three periods showed a similar trend. That is to say, the average erosion modulus and erosion amount show the maximum value in the height of 1475m, and with the increase of slope, the average erosion modulus increases. The erosion amount above 75% in the basin all come from the slope area of 15 掳. The average erosion modulus of the three periods all follow the law of the sun-slope and the half-sun-slope and the shady slope. The study is to evaluate the benefit of the ecological environment construction and the reasonable benefit of the soil and water resources in the region. To provide useful information.
【作者单位】：西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金项目(41230852,41440012,41101265) 黄土高原土壤侵蚀与旱地农业国家重点实验室专项(A314021403-C2)
【分类号】：S157.1

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