区域尺度地貌参数及其与水土流失的关系

基于坡度均一和坡面连续2个假定,提出了综合反映区域地貌特征的区域地貌参数计算方法。由于计算区域地貌参数所采用的地面坡度可以自动提取,而且对研究单元大小没有明确要求,因此可用于地形、地貌指标相关研究的尺度转换。黄河中游多沙粗沙区区域地貌参数平均值为10.89,其中:黄土丘陵沟壑区第一副区最大,黄土丘陵沟壑区第二副区与土石山区次之,风沙区最小。区域地貌参数与沟壑密度、林草覆盖率、水土流失面积比例均呈极显著正相关,其与坡耕地面积比例、年降水量和垦殖率等参数组合,可以很好地反映水土流失特征。

It puts forward a parameter calculation method which can comprehensively reflect regional geomorphic characteristics based on 2 assumptions of steady gradient and continuous slope.It can be used for the scale conversion for relevant studies on geomorphy and topography because the used ground slope for calculated regional geomorphic parameter can be automatically extracted and no clear requirements on the size of studied unit.The mean value of geomorphic parameters of heavy and coarse sediment load area of t...