摘 要：
为研究冻融坡面径流冲刷条件下侵蚀产沙过程,采用2个坡度(10°,15°)、3个流量(3,6,9 L/min)、2个起始解冻深度(6,12 cm)组合进行野外冲刷试验,结合近景摄影测量技术分析不同解冻深度、不同坡度和不同流量条件下的产沙量,运用线性回归方程对近景摄影测量值和实测值进行拟合。结果表明:起始解冻深度和坡度相同条件下,冻融坡面的土壤侵蚀产沙量随着径流量和坡度的增大而增大;随着时间推移,产沙量越来越小。在流量和坡度相同时,随着初始解冻深度的增大,坡面产沙量也逐渐增大;在流量和解冻深度相同时,随着坡度的增大,坡面产沙量也逐渐增大。当流量、解冻深度和坡度最大时,坡面侵蚀产沙量达到最大。坡面产沙量实测值与近景摄影测量对比分析得到误差平均精度为90.67%,近景摄影测量技术可以在冻融条件下土壤侵蚀监测中应用。
译 名：
Erosion and Sediment Yield Process on Freeze-thaw Slope Based on Close Range Photogrammetry Under Runoff Scouring Conditions
作 者：
MING Xuhui;WANG Xuan;SHENG Siyuan;ZHANG Kai;LI Wanjiang;Colloege of Hydraulic Engineering, Shenyang Agricultural University;
关键词：
freeze-thaw slope;;sediment yield process;;closerange photogrammetry
摘 要：
Freezing-thawing is one of the main external forces of soil and water loss on slopes during spring thawing period. In order to study the erosion and sediment yield process under the condition of runoff scouring on frozen-thawed slopes, two slope gradients(10, 15 degrees), three flow rates(3, 6, 9 L/min) and two initial thawing depths(6, 12 cm) were used to carry out field scouring tests with close-range photography. The sediment yield under different thawing depths, slopes and discharge conditions was analyzed by measuring technique. The close-range photogrammetric measurements and measured values were fitted by linear regression equation. The results showed that under the same conditions of initial thaw depth and slope, the soil erosion and sediment yield on the freeze-thaw slope increased with the increase of flow and slope; with the passage of time, the sediment yield would be smaller and smaller. At the same flow and gradient, the sediment yield increased with the initial thaw depth. When the flow rate and thaw depth were the same, the sediment yield increased with the increase of slope. When the discharge, thaw depth and slope were the largest, the erosion and sediment yield on the slope reached the maximum. Compared with the close range photogrammetry, the average error of the measured sediment yield was 90.67%. The close range photogrammetry technology can be applied to soil erosion monitoring under freeze-thaw conditions.
