| 3种沙障防风固沙效益比较的风洞实验研究 |
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| 引用本文： | 钟卫,刘涌江,杨涛.3种沙障防风固沙效益比较的风洞实验研究[J].水土保持学报,2008,22(6). |
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| 作者姓名： | 钟卫 刘涌江 杨涛 |
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| 作者单位： | 1. 西南交通大学,土木工程学院,四川,成都,610031
2. 重庆交通科研设计院,重庆,400067 |
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| 基金项目： | 西藏自治区交通厅科技项目 |
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| 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。
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| 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 Study on Effect Contrast of Wind-breaking and Sand-fixing of Three Sand-barriers |
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| ZHONG Wei,LIU Yong-jiang,YANG Tao.Wind Tunnel Test Study on Effect Contrast of Wind-breaking and Sand-fixing of Three Sand-barriers[J].Journal of Soil and Water Conservation,2008,22(6). |
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| Authors: | ZHONG Wei LIU Yong-jiang YANG Tao |
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| Institution: | ZHONG Wei1,LIU Yong-jiang2,YANG Tao1 |
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| Abstract: | 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-barriers 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. |
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| Keywords: | wind tunnel test geo-grid cell sand-barrier stone-checker sand-barrier vegetation sand-barrier wind-breaking and sand-fixing protective efficiency |
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