Influence of atmospheric stability on formation of artificial anoxic area over sea surface
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摘要: 针对水中释放气体形成的特定稀氧区, 利用MATLAB和高斯烟羽模型模拟分析了6种大气稳定度等级(A~F)下不同位置的气体浓度变化情况, 绘制了相应的等浓度曲线和曲面, 给出了大气稳定度对稀氧区形成的具体影响规律。分析结果表明: 连续点源的几何高度为0, 抬升高度近似为0, 有效源高度近似为0;在同一下风向距离处与海面同一位置处, 气体浓度从低到高对应的大气稳定度等级依次为A~F; 等浓度曲线覆盖面积、等浓度曲面覆盖区域从小到大对应的大气稳定度等级依次为A~F。可见, 随着大气稳定度的提高, 气体的停留时间增加, 浓度升高, 贴近海面扩散的趋势明显, 有利于有效半径更大稀氧区的形成和维持。Abstract: Aiming at the formation of specified anoxic area by gas release in water, MATLAB and Gaussian plume model were used to simulate and analyze the change of gas concentrations at different locations under six atmospheric stability classes(A-F), and the corresponding isoconcentration curve and surface were drawn.The specific influence law of atmospheric stability on anoxic area formation was given. Analysis result shows that the geometric height of continuous point source is 0, the rising height is approximately 0, and the effective source height is approximately 0.The corresponding atmospheric stability classes of gas concentrations from low to high at the same downwind distance and the same sea surface location are A-F successively.The corresponding atmospheric stability classes of areas covered by isoconcentration curves and regions covered by isoconcentration surfaces are A-F successively.With the increase of atmospheric stability, the residence time and concentration of gas increase.So the tendency of diffusion close to sea surface is obvious, which is beneficial to the formation and maintenance of anoxic area with larger effective radius.
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图 4 大气稳定度等级为D时的等浓度曲线
Figure 4. Isoconcentration curves of atmospheric stability class D
图 5 六种大气稳定度等级下的等浓度曲线
Figure 5. Isoconcentration curves of six atmospheric stability classes
图 6 六种大气稳定度等级下的等浓度曲面
Figure 6. Isoconcentration surfaces of six atmospheric stability classes
图 7 六种大气稳定度等级下的等浓度曲面
Figure 7. Isoconcentration surface of each atmospheric stability class
表 1 Pasquill-Gifford模型的大气稳定度等级
Table 1. Atmospheric stability classes of Pasquill-Gifford model
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表 2 农村条件下Pasquill-Gifford模型的扩散系数方程
Table 2. Diffusion coefficient equations of Pasquill-Gifford model under rural condition
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