Comparison Of Field Observation With Water Tank Experiment On Air Pollution Concentration In Kathmandu Valley
Comparison Of Field Observation With Water Tank Experiment On Air Pollution Concentration In Kathmandu Valley
复制标题
加德满都谷地空气污染浓度现场观测与水箱实验比较
DOI：
10.2495/air020491
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
B. Sapkota
中科院分区：
文献类型：
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作者：
A. Kondo;M. Shrestha;A. Kaga;Y. Inoue;B. Sapkota
加德满都谷地冬季的空气污染浓度比夏季高，这是因为加德满都谷地形成的逆温层对空气污染浓度有很强的影响。通过水槽实验和数值计算模拟了这一机理。在实验开始时进行热分层，并以12分钟的时间改变水箱底部的温度。在坡底温度维持在高温的同时，坡面产生上升气流和B4-mrd对流。当坡底温度维持在较低温度时，坡面产生下沉气流，形成逆温层。计算出的污染浓度与实测值在定性上一致。
The air pollution concentration in the winter season of Katmandu valley is very high compared with summer season, because the air pollution concentration was strongly influenced by the inversion layer that is formed at Katmandu valley. This mechanism was simulated by a water tank experiment and by numerical calculation. Thermal stratification was made at the start of the experiment, and the temperature on the bottom of water tank was changed with the period of 12 minute. The updraft wind on the slope and B4-mrd convection occurred while the bottom temperature was maintained in high temperature. The downdraft wind on the slope occurred and the inversion layer was formed while the bottom temperature was maintained in low temperature. The calculated pollution concentration was qualitatively agreed with the field observation in ~atmandu valley.