摘要
在 7m/s、15m/s和 2 0m/s的实验风速下 ,对不同浓度土壤凝结剂处理的沙障模型进行风洞吹蚀实验。实验结果表明 :抗风蚀强度以 4 0 %浓度处理最强 ,2 0 %最弱 ,但 30 %浓度防风蚀效果较为实用。在乌兰布和沙漠东北缘绿洲边缘的流动沙丘 ,采用较为适用的 30 %浓度的土壤凝结剂进行 1m× 1m ,1 5m× 1 5m ,2m× 2m等 3种不同规格沙障喷洒实验 ,通过对风速、粗糙度、风沙流结构特征值 ,以及沙障的蚀积状况进行调查 ,其结果表明 ,各种规格的沙障中 ,1m× 1m的沙障性能最好 ,1 5m× 1 5m次之 ,2m× 2m最差。沙丘不同部位沙障的抗蚀力不同 。
The wind erosion characteristics of soil coagulant sand barrier with different concentration treatments were measured under wind tunnel test in the testing wind velocity of 7 0?m/s,15 0?m/s and 20?m/s. The results showed that the strongest wind erosion resistance was sand fixing sampling of 40% concentration treatment, and the 20% sampling treatment was worst, but 30% treatment sampling was more practical. The soil coagulant sand barriers, which consisted of 1×1?m,1 5×1 5?m and 2×2?m etc., with 30% concentration spraying was built on shifting sand dune at brim of oasis in northeast of Wulanbuhe desert. Based on the investigation of wind velocity, roughness, structure value ( λ ) of wind sand current, erosion and deposit conditions of sand barrier, the results showed that the best ability of deposition and erosion resistance of sand barrier was 1×1?m scale, 1 5×1 5?m was worse, and 2×2?m was the worst. The ability of erosion resistance of barrier at different parts of sand dune was different. The erosion rate and erosion degree were strongest in windward slope of dune.
出处
《中国水土保持科学》
CSCD
2004年第2期45-49,61,共6页
Science of Soil and Water Conservation
基金
国家自然科学基金项目 (30 0 70 6 0 0 )
"十五"科技攻关项目"沙区农田草地土壤风蚀防治技术研究"
国家自然科学基金项目 (30 36 0 0 88)
关键词
土壤凝结剂沙障
防风固沙实验
风沙流结构
蚀积状况
soil coagulant sand barrier
wind tunnel test
Wulanbuhe desert
structure of wind sand current
erosion deposition conditions
