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Gas emission is affected by many factors. Effects of atmospheric pressure on coal mine gas emission have become a rising concern. Basing on the gas emission at Y485 fully mechanized working face of Tangshan mine and atmospheric pressure, the paper had carried out online monitoring with sensors for 20 days continuously. Calculating the average values of atmospheric pressure and the expectation values of return air gas concentration of each hour on every monitoring date according to monitoring data, affection laws of atmospheric pressure to gas emission at fully mechanized working face were studied combining the weather and temperature of monitoring dates. It pointed out that the atmospheric pressure declines along with the rising of temperature and the gas emission at fully mechanized working face could be restrained if the atmospheric pressure rises, otherwise it could be promoted to release, the affection of variation of atmospheric pressure to gas emission was 0.0575%/hPa on cloudy day, and was 0.0446%/hPa on sunny day, and it was predicted that the peak time of gas emission at fully mechanized working face was from 12 o’clock to 16 o’clock according to the data processing results. [ABSTRACT FROM AUTHOR]

Abstract: Coastal wetlands are important land resources in Tangshan, including natural wetlands and artificial wetlands. Spatial form of wetlands is zonal distribution, contours approximately paralleling with the coastlines. The formation is controlled by the favorable weather conditions and good hydrogeological conditions, such as the rapid subsidence of ground caused by Neotectonics, abundant precipitation system and dense surface water. The formation and development of coastal wetlands in Tangshan is the response record to research coupling relationship among neotectonic movement - climate evolution - environmental changes. [Copyright &y& Elsevier]