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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。
Aiming at the specific dilute oxygen zone formed by the released gas in water, the gas concentrations in six different atmospheric stability grades (A ~ F) were simulated and analyzed by MATLAB and Gaussian plume models. The corresponding isoconcentration curves and surfaces , Gives the atmospheric stability of the formation of the specific area of the law of dilute oxygen. The results show that the geometric height of continuous point source is 0, the height of lift is approximate to 0, and the effective source height is approximately 0. At the same position of the downwind distance at the same position with the sea surface, the atmospheric stability level corresponding to low to high gas concentration Followed by A ~ F; contour curve coverage area, the concentration of surface coverage area from small to large corresponds to the degree of atmospheric stability, followed by A ~ F. It can be seen that as the stability of the atmosphere increases, the residence time of the gas increases, the concentration increases, and the tendency of diffusion close to the sea surface is obvious, which is in favor of the formation and maintenance of a more dilute oxygen zone with an effective radius.