摘要
通过风洞实验,研究了土工格室、石方格、不同盖度植被3种不同沙障的防沙机理,分析了各种沙障下的风速廓线、风速流场及风沙流结构特征,比较了3种不同沙障的防沙效果。结果表明:植被具有显著的防风作用,随着盖度的增加其防风作用逐渐增强,同时,风速的变化还与植株的茂密程度有关。对于石方格沙障,由于构成石方格的石块不规则,计算结果与总体变化规律有一定差异。总的来讲,植被沙障的防护效果远较土工格室和石方格沙障为优,对于低风速地区,采用土工格室和石方格沙障治沙是有效的,而对于高风速地区,只能采用植被沙障防护才有良好效果。相比较土工格室和石方格沙障,石方格沙障的防护效率又略优于土工格室。
By wind tunnel test, the sand preventing mechanism of geo-grid cell sand-barrier, stone-checker sand-barrier and vegetation sand-barrier are studied. The wind velocity profile, wind velocity flow field and structural features of wind sand flows are analyzed. The sand preventing effects of three different sand-barri- ers are compared. The results showed that the vegetation has prominent effect on wind prevention, and the affection enhanced gradually with the increase of the coverage. Meanwhile, the change of wind speed also related to the luxuriance degree of plants. But to stone-checker sand-barrier, because stone block composing stone-checker is irregular, the experimental result had certain differences on the general regularity. Generally speaking, the protection effect of vegetation is far superior to geocell and stone-checker. To the low wind speed, the geocell and stone-checker is effective, but to the high wind speed, the vegetation is much suitable. For stone-checker and geocell, the protective efficiency of stone-checker is slightly better than geocell.
出处
《水土保持学报》
CSCD
北大核心
2008年第6期7-12,共6页
Journal of Soil and Water Conservation
基金
西藏自治区交通厅科技项目(2005-0016)
关键词
风洞实验
土工格室沙障
石方格沙障
植被沙障
防风固沙
防护效率
wind tunnel test
geo-grid cell sand-barriers stone-checker sand-barriers vegetation sand-barriers wind-breaking and sand-fixing
protective efficiency
