摘要
采用CFD方法 ,对崇明岛瀛东村鱼塘防风林的规划进行了数值模拟分析。在二维计算流体力学模拟中,采用标准k-ε湍流模型。在固定林带宽度下分别模拟防风林3种林分高水平有叶期和无叶期状态的防风效应,分析比较了防护效果的差异。结果显示,无叶期的防护距离L_(50)为85 m,覆盖了鱼塘的65%。而有叶期可以完整保护鱼塘,防护范围内最大风速只有初始值的29.6%。若直接栽种树苗有5年左右的培育期,防护距离L_(20)可以覆盖鱼塘,L_(50)也可以达到鱼塘的35%左右,平均风速降为2.48m·s^(-1)。
Windbreak planning of Ying Tung ponds in Chongming island have been studied by computational fluid dynamics （CFD）. The standard κ-ε turbulence model was applied to carry out the two-dimensional computational fluid dynamics simulation. The protective effects of windbreak forest were simulated and compared in a fixed width, with no leaf stage and leaf stage in three levels of forest height. The results showed that no leaf stage of Protection distance L50 was 85 m, covering 65% of the fish ponds. While leaf stage can completely protect the fish pond, whose maximum wind speed within the protection zone only 29.6% of initial value. Saplings would require the cultivation period of 5 years, then the Protection distance L50 can cover fish ponds, L50 can reach about 35% of the fish ponds, the average wind speed reduced to 2.48 m·s^-1.
出处
《上海交通大学学报（农业科学版）》
2010年第3期204-208,217,共6页
Journal of Shanghai Jiaotong University(Agricultural Science)
基金
上海市科技计划项目(编号:08DZ1205901)
关键词
防风林
数值模拟
计算流体力学
疏透度
windbreaks
numerical simulation
computational fluid dynamics （CFD）
porosity
