崩岗崩积体坡面糙度及其与侵蚀方式的耦合影响研究

发布时间：2018-03-14 03:57

本文选题：崩岗崩积体　切入点：侵蚀方式　出处：《农业机械学报》2017年11期 　论文类型：期刊论文

【摘要】：崩岗崩积体是崩岗的主要沙源地。基于人工模拟降雨试验及三维激光扫描技术,研究崩岗崩积体坡面侵蚀过程。研究表明:利用三维激光扫描的点云数据能定量分析降雨前后坡面水蚀特征。全坡面及各坡位均为片蚀总量大于细沟侵蚀总量,但各坡位的侵蚀强度有所差异,其细沟侵蚀强度由大到小表现为下坡、中坡、上坡,片蚀强度由大到小表现为上坡、中坡、下坡。坡面空间糙度由大到小大致呈现下坡位、中坡位、上坡位,坡面侵蚀方式可影响坡面糙度值及变化趋势,而坡面糙度亦能影响各侵蚀方式的侵蚀强度。整个降雨时段内全坡面侵蚀量最大、产沙量次之,沉积量最小,受坡面糙度变化影响,全坡面侵蚀、产沙量均呈现递减趋势。而上坡位的侵蚀、产沙量无明显变化,中、下坡位的侵蚀、产沙量呈对数减小趋势。此外,除上、下坡位沉积量间存在显著差异外,各坡位间侵蚀量、产沙量均无显著差异。
[Abstract]:The avalanche is the main sand source of the collapse. Based on the artificial simulated rainfall test and 3D laser scanning technology, The study shows that the erosion characteristics of the slope surface before and after rainfall can be quantitatively analyzed by using the point cloud data of 3D laser scanning. The total erosion amount of the whole slope and each slope is larger than that of the rill erosion. However, the erosion intensity of each slope is different, and its rill erosion intensity shows downhill from big to small, middle slope, upslope, sheet erosion intensity from large to small, middle slope, downhill. The spatial roughness of slope is roughly downhill from big to small. In the middle slope position, the upper slope position, the slope erosion mode can affect the roughness value and the change trend of the slope surface, and the slope roughness can also affect the erosion intensity of each erosion mode. The total slope erosion amount is the largest, the sediment yield is the second, and the sediment amount is the smallest during the whole rainfall period. Under the influence of roughness variation, the total slope erosion and sediment yield showed a decreasing trend. However, in the upper slope position, the sediment yield did not change obviously, but the erosion in the middle and downhill position showed a logarithmic decreasing trend. There was no significant difference in erosion and sediment yield between different slope positions.
【作者单位】：广东省生态环境技术研究所;中山大学地理科学与规划学院;广东省农业环境综合治理重点实验室;
【基金】：水利部公益性行业科研专项(201501047) 广东省自然科学基金研究团队项目(S2012030006144) 广东省科学院引进高层次领军人才专项资金项目(2060599) 省院创新平台建设专项(2016GDASPT-0105、2016GDASPT-0304) 农田重金属污染治理创新人才队伍建设项目(2016B070701015)
【分类号】：S157.1

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