Comparison of the Methods of Barometric Efficiency Estimation by Water Level:An Application to Gaoda Well in Yunnan
On the basis of the data of barometric pressure and water level in Gaoda Well in Yunnan from February 1,2019 to July 28,2020,we calculated the well's barometric-efficiency values with the Clark method,the Rahi method,the regression deconvolution method,and the Acworth method,and compared the calculated values from these four methods,so as to study the principles and difference of these four methods.The barometric-efficiency values were 0.4395,0.4968,0.6174 and 0.6654 respectively,and the average is 0.5548.The calculation of the Clark method and the Rahi method is simple and convenient,but the effect of time lag is neglected by these two methods.The variation of the barometric-efficiency values with lag time can be obtained by the regression deconvo-lution method,but this method is highly susceptible to the influence of signals like precipitation and evapotranspi-ration.The Acworth method takes into account the earth tide signal and avoids the interference of precipitation and evapotranspiration signals,but it is only applicable to confined and semi-confined aquifers.Finally,according to the characteristics and applicability of the four methods,we proposed suggestions for the selection of different meth-ods of calculating the barometric efficiency under different conditions.
barometric pressurewell-water levelbarometric efficiencyGaoda Well in Yunnan