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The phenomenon of wastewater discharged into coastal waters can be simplified as a turbulent jet under the effect of waves and currents. Previous studies have been carried out to investigate the jet behaviors under the current only or the wave only environment. To gain obtain better understanding of the jet behaviors in a realistic situation, a series of physical experiments on the initial dilution of a vertical round jet in the wavy cross-flow environment are conducted. The diluted processes of the jet are recorded by a high-resolution camcorder and the concentration fields of the jet are measured with a peristaltic suction pumping system. When the jet is discharged into the wavy cross-flow environment, a distinctive phenomenon, namely “effluent clouds”, is observed. According to the quantitative measurements, the jet width in the wavy cross-flow environment increases more significantly than that does in the cross-flow only environment, indicating that the waves impose a positive effect on the enhancement of jet initial dilution. In order to generalize the experimental findings, a comprehensive velocity scale ua and a characteristic length scale l are introduced. Through dimensional analysis, it is found that the dimensionless centerline concentration trajectories is in proportional to 1/3 power of the dimensionless downstream distance , and the dimensionless centerline dilution is proportional to the square of the dimensionless centerline trajectory . Several empirical equations are then derived by using the Froude number of cross-flow Frc as a reference coefficient. This paper provides a better understanding and new estimations of the jet initial dilution under the combined effect of waves and cross-flow current. 相似文献
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采用粒子图像测速和平面激光诱导荧光技术对波浪环境中倾斜射流的运动和稀释特性进行了实验研究,对比分析了排放角度对射流瞬时运动形态、时均速度场和时均浓度场的影响。实验结果表明排放角度的变化对波浪环境中射流的运动形态、速度分布和混合范围等均有显著影响。当射流顺波浪方向运动时,射流主体段速度剖面呈双峰分布,达到初始浓度20%、30%、40%和50%的混合范围随排放角度增加而先增大后减小;当射流逆波浪方向运动时,射流速度剖面双峰分布不明显,相应的混合范围随排放角度增加而减小。在波浪牵引和射流卷吸的共同作用下,逆向射流的稀释效果总体上优于与垂线方向相同夹角的顺向射流。 相似文献
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莱州湾夏营站温带风暴潮预报方案编制 总被引:1,自引:1,他引:0
本文依据莱州湾夏营站1960-1987年的风暴增水资料,对夏营站的风暴增水以及诱发增水的天气形势进行了分析分类,对夏营站的温带风暴潮预报方法进行了研究,从而建立了经验相关和统计相关两类预报方案,通过对这些方案的检验,都获得了比较满意的结果。 相似文献
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厄尔尼诺现象对山东省洪涝的影响 总被引:2,自引:0,他引:2
本文利用建国后历次厄尔尼诺现象适当分型资料分别统计分析了山东省汛期旱涝特征,并对反厄尔尼诺年时,山东汛期降雨特征和影响山东的台风进行了统计分析,均得到较好的效果。利用近150年的山东省各流域洪涝灾害资料和厄尔尼诺年分型资料对山东汛期洪涝灾害与厄尔尼诺现象的关系进行了分析,其分析结果对预测山东汛期洪涝灾害趋势具有较好的参考意义。 相似文献
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本文叙述了1989年夏季山东省干旱和水资源短缺的概况。分析了1989年夏季山东严重干旱的气候背景和天气特征、并与1968年夏季山东干旱的环流特征、降水的时空分布进行了对比分析。 相似文献