论文部分内容阅读
对中国东北地区侵蚀产沙尺度效应的空间变化进行了探讨。基于气候、下垫面的一致性和流域的完整性,对整个研究区域进行了分区研究。结果表明,尺度效应同时受到地形、坡度、土地利用和地表覆盖物质等因素的影响,不同分区因素因素组合不同,其产沙模数随流域面积的变化趋势亦不相同,可以分为三类:(1)产沙模数随流域面积增大而增大;(2)产沙模数随流域面积的增大基本保持不变;(3)产沙模数随流域面积的增大而减小。基于各分区尺度效应,进行了不同标准面积下产沙模数图的校正,并使用空间插值方法,编制不同标准面积下产沙模数图。
The spatial variation of scale-effect of erosion and sediment in northeast China was discussed. Based on climate, underlying surface consistency and basin integrity, the study area was zoned. The results show that the scale effect is affected by topography, slope, land use and surface cover material. The combination of different zoning factors has different trend of change of sediment yield with basin area, which can be divided into three categories: (1) The model of sediment yield increases with the increase of catchment area; (2) The model of sediment yield basically remains unchanged with the increase of catchment area; (3) The model of sediment yield decreases with the increase of catchment area . Based on the scale effect of each zone, the correction of sediment yield modulus under different standard areas was carried out. The spatial pattern of sediment yield was prepared under different standard areas.