Abstract
Barometric pressure coefficient and tidal factor are used to study the porosity, the solid skeleton volume compressibility coefficient and the water volume compressibility coefficient of the Dahuichang well, Banqiao well, Huanghua well, Dadianzi well, Fengzhen well and Sanhaodi well in the northern region of North China under undrained condition. The results show that there is power function relation between the porosity and the volume compressibility coefficient(the solid skeleton and the water)in the aquifer. In the first quadrant, the solid skeleton volume compressibility coefficient of each well increases with the increase of the porosity, the volume compressibility coefficient of the water decreases with the increase of porosity. Between the volume compressibility coefficient of the solid skeleton and the water exist unary quadratic polynomial relationship, and the volume compressibility coefficient of water is larger than that of solid skeleton, the water is easier to compress. In addition, according to the step barometric pressure response function in the regression deconvolution method, the groundwater type identifying results of the six wells aquifer system are shown that there is an e based exponential function between the lag time and the step barometric pressure response function of each well water level to barometric pressure. The coefficient before the base e is positive or negative to determine the groundwater type of the well aquifer system. For confined wells, the step barometric pressure response function increases with lag time of well water level to barometric pressure, while the unconfined wells and semi-confined wells are opposite.
Highlights
The analysis of the earth tides and the barometric pressure effects, and how they relate to the aquifer parameters. such as, porosity and volume compressibility coefficient of solid skeleton or water and so on, have always been the research focus of the domestic and foreign scholars [2, 4, 6,7,8,9,10, 13, 16, 18, 22,23]
The quantitative identifying of groundwater type by the step barometric pressure response function, and what's the relationship between the step barometric pressure response function and the lag time of the well water level to the barometric pressure
For confined well (For example, Dadianzi well, Sanhaodi well and Dahuichang well ), the step barometric pressure response function of the water level to the barometric pressure is increased with the increase of lag time
Summary
The analysis of the earth tides and the barometric pressure effects, and how they relate to the aquifer parameters. such as, porosity and volume compressibility coefficient of solid skeleton or water and so on, have always been the research focus of the domestic and foreign scholars [2, 4, 6,7,8,9,10, 13, 16, 18, 22,23]. Such as, porosity and volume compressibility coefficient of solid skeleton or water and so on, have always been the research focus of the domestic and foreign scholars [2, 4, 6,7,8,9,10, 13, 16, 18, 22,23]. Under undrained condition, the quantitative relationship between barometric pressure coefficient (or tidal factor) and porosity, volume compressibility coefficient of solid skeleton (or water) are generally given. A lot of researches have been carried out on the correction of barometric pressure and earth tide component in water level by using the regression deconvolution method [15, 19,20, 11].
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