|覃超1; 郑粉莉1,2; 徐锡蒙1; 何煦1
势，而细沟水流宽度逐渐减小; 20°坡度下细沟宽度和深度的增加速率分别是15°坡度下的1. 7 倍和1. 3 倍; 同20°坡度相
比， 15°坡度条件下的细沟水流的宽度增加了1. 7% ～13. 1%，而2 个试验坡度下的细沟水流深度无明显差异。
Accurate measurements of rill geometry and flow parameters provide theoretical basis for
erosion processes on hillslopes． Ｒill width and depth are basic rill morphological characteristics． Ｒill flow
width and depth are the foundation for calculating hydraulic and hydrodynamic parameters． A soil box
( 2. 0 m long，0. 3 m wide and 0. 5 m deep) was subjected to a 140 s movable-bed scouring test under a
surface inflow rate of 1 L /min with slope gradients of 15° and 20°． Based on photogrammetry，point cloud
and high-precision DEMs of the soil bed at different times were extracted． Measurements of rill depth and
width，and rill flow depth and width were made． Variation trends of rill morphology and rill flow
characteristics were analyzed and differences between photogrammetry and other measurement methods
were discussed． The results showed that rill width and rill flow width could be measured directly from
perpendicularly shot photographs after proportional scale calibration． Based on interpolation principal，
dynamic variations of rill depth and rill flow depth could be measured． With increasing slope length，rill
depth was increased while rill flow depth showed no significant trend． Ｒill width was increased and then
decreased while rill flow width was decreased gradually along the soil bed． Increasing rates of rill widthsand depths with slope gradient of 20° were 1. 7 and 1. 3 times as those with slope gradient of 15°． Ｒill flow
widths in different cross-sections with slope gradient of 15° were 1. 7% ～ 13. 1% larger than those with
slope gradient of 20°，while rill flow depths showed little difference between these two slope gradients． Ｒill
depths and rill flow depths obtained by manual measurements with a steel ruler were 3. 3% ～ 5. 1% and
91. 0% ～178. 5% higher than those obtained by photogrammetry． Compared with traditional methods and
3D laser scanning technique，photogrammetry had speed，resolution and non-contact advantages and it can
also overcome rill wall shield and prevent the occurrence of point cloud“black holes”.
覃超,郑粉莉,徐锡蒙,等. 基于立体摄影技术的细沟与细沟水流参数测量[J]. 农业机械学报,2016,47(11):150-156.
覃超,et al."基于立体摄影技术的细沟与细沟水流参数测量".农业机械学报 47.11(2016):150-156.
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