The pollutant behavior in ground air and its effects on surface air

地面空气污染发生在地理污染场地，例如废物处置场地。大气压力波动引起的地面空气中气体污染物的传输为了弄清垃圾处理场地下污染物的传输，弄清地面空气流量波动与大气压力之间的关系是很有意义的。作为分析流动的手段，在各包气带布置了由地下水位监测井和特氟龙管组成的污染观测系统，监测地面空气压力和气态污染物运移，并设置了监测仪器、地面空气流量计、地面气压与大气压力差计、气压计和温度计。因此，由大气抽水引起的地面气流进、出、出现象具有短周期周期和长周期周期，如台风等。前者称为陆地呼吸，后者称为陆地深呼吸。一般认为，在低气压下，地下流量增加。此外，我们还可以看出，流量只在低压的下降趋势中增加，在上升趋势中停止。气态污染物的输送只有在低压的下降趋势下才会发生。这份报告是这项研究的第一阶段，将有助于分析来自地下的气体污染物的行为。

Ground air pollution occurs on geo-pollution sites, e.g. waste disposal sites. Transport of gaseous pollutant in ground air induced by ground air flows with atmospheric pressure fluctuation.In order to clarify the transport of pollutant from subsurface in waste disposal sites, it is useful to clear the relationships between the fluctuations of ground air flows and atmospheric pressure previously. As the way to analyze the flows we arranged the pollution observation system consisting of observation wells for the monitoring of ground water table and teflon tubes in each vadose zone for the monitoring of ground air pressure and transport of gaseous pollutant and also set the monitoring apparatus, flow meter of ground air, meter of pressure difference between ground air pressure and atmospheric pressure, barometer and thermometer. As a result, the phenomenon of ground air flow, inflow-outflow, induced by atmospheric pumping, and, has the cycle of short period and the cycle of long period, e.g. typhoon. The former cycle and the later are respectively called the breathing and the deep breathing of land.It was generally recognized that the flows from subsurface increase under low pressure. Furthermore, we could show that the flows increase only in the down trend of the low pressure and stop in the up. The transport of gaseous pollutant will occurs only under the down trend of the low pressure. This report is first stage of the study that will contribute to analyze the behavior of the gaseous pollutant from subsurface.