红壤坡面细沟侵蚀参数提取研究

The Extraction of Rill Erosion Parameters on Red Soil Slope

为研究自然降雨条件下南方红壤区坡面细沟侵蚀形态,应用无人机摄影测量技术与计算机数字图像处理相结合的方法,提取了江西水土保持生态科技园内自然降雨条件下3个不同野外裸露小区坡面细沟形态参数并进行分析。结果表明:坡面细沟在中坡位的分布密度最大,其次是下坡位,最后是上坡位;细沟宽度随着坡长增加大致呈现两头宽中间窄的类U形;细沟深度随坡长的增大大致呈现先增大后减小的趋势;细沟宽深比大致随坡长的增加而减小,在接近坡底处达到最小值。

In order to study the rill erosion pattern of red soil region in the south of China under the conditions of natural rainfall,the paper extracted and analyzed the morphological parameters of three soil exposed sloping plots in the eco-scientific zone of soil and water conservation in Jiangxi province by using the combination of UAV photogrammetry technology and computer digital image processing. The outcomes show that a) the distribution density of rills on the middle slope is the maximum,then is the downhill and the last is the uphill;b) with the increase of slope length,the rill width presents a U-like shape,which is wide at both ends and narrow in the middle;c) the rill depth increases first and then decreases with the increase of slope length and;d) the width-depth ratio of rill decreases with the increase of slope length and reaches to the minimum value as near the bottom of the slope.