梯田区侵蚀地形因子随DEM分辨率变化的特征分析

发布时间：2018-08-22 20:45

【摘要】：通过无人机航空摄影测量,获取高精度DEM,分析提取的坡度、坡长和LS因子,同时通过分辨率的变化,计算并分析了这些参数的变化情况。研究表明:基于无人机获取的DEM能够较好地表达梯田地形特征,梯田地形因子分布特征与地形特征吻合,大值集中于梯田过渡的陡坡处,小值集中于田面。随着分辨率的降低,非梯田区坡度整体呈现衰减趋势,坡长呈现增长趋势,LS先小幅增加,后由于坡度衰减明显,LS呈现衰减趋势,但变化幅度不大;而梯田区随着分辨率的降低,小坡度和超大坡度所占比例均减小,平均坡度降低,但坡长增加显著,因此导致LS增长较显著,在20 m分辨率下,LS因子被高估约1/3。梯田通常作为水保措施因子单独来考虑,由于分辨率对地形因子影响较大,因此梯田区的地形因子估算需要考虑分辨率的影响。
[Abstract]:The high-precision DEM is obtained by UAV aerial photogrammetry, and the slope, slope length and LS factor are analyzed. The variation of these parameters is calculated and analyzed by changing the resolution. The results show that the terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrac With the decrease of resolution, the whole slope of non-terraced field tends to attenuate, and the slope length tends to increase. LS first increases slightly, and then decreases obviously because of the slope attenuation, LS tends to attenuate, but the range of change is small. The proportion of super-large slope decreases, the average slope decreases, but the slope length increases significantly, which leads to a significant increase in LS. At 20 m resolution, the LS factor is overestimated by about 1/3. Terraces are usually considered as water and soil conservation measures alone. Because the resolution of terraces has a greater impact on the topographic factors, the terrace factor estimation needs to consider the resolution. The effect of rate.
【作者单位】：西北农林科技大学信息工程学院;西北大学城市与环境学院;西北农林科技大学水利与建筑工程学院;西北农林科技大学经济管理学院;
【基金】：国家重点研发计划项目(2017YFC0403203) 国家自然科学基金项目(41771315、41301283、41371274、41301507、61402374) 欧盟地平线2020研究与创新计划项目(ISQAPER:635750) 陕西省自然科学基础研究计划项目(2016JM6038) 西北农林科技大学基本科研业务费专项资金项目(2452015060)
【分类号】：S157

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