Winter Air Pollution Mechanism of Katmandu Valley by Water Tank Experiment
Winter Air Pollution Mechanism of Katmandu Valley by Water Tank Experiment
复制标题
通过水箱实验研究加德满都谷地冬季空气污染机理
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Kaga
中科院分区：
文献类型：
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作者：
M. Shrestha;A. Kaga
由于加德满都河谷逆温层的形成，冬季大气污染物浓度高于夏季。通过水槽实验和数值计算对该机理进行了模拟。实验开始时进行了热分层，并根据加德满都河谷的温度场，以12 min为周期改变河谷模型的表面温度。白天出现上升气流和伯纳德对流，夜间出现下沉气流和逆温层。水槽实验得到的流场和温度场与数值计算结果定性一致。
The air pollution concentration in winter season is found higher than summer season due to the formation of inversion layer in Kathmandu valley. This mechanism was simulated by water tank experiment and numerical calculation. Thermal stratification was made at the beginning of the experiment and the surface temperature of valley model was changed with the period of 12 minute matching the field temperature of Kathmandu valley. The updraft wind and Bernard convection occurred during the daytime and downdraft wind and inversion layer were realized during nighttime. The flow field and temperature obtained in water tank experiment and numerical calculation qualitatively agreed.