维尼迪科夫调和分析对大甸子井水位潮汐因子和相位的气象影响研究

利用维尼迪柯夫潮汐调和分析方法计算内蒙古大甸子井水位原始资料和剔除气压、降雨资料后的潮汐因子和相位。结果显示,两种情况下得到的潮汐因子和相位具有较好的一致性,说明采用维尼迪柯夫潮汐调和分析方法得到的结果基本不受降水、气压等因素的影响。这对于缺少气压和降水等辅助观测的水位观测资料,使用原始资料进行维尼迪科夫潮汐调和分析,可获取比较可靠的潮汐因子和相位参数。

Meteorological Influence of Venedikov Harmonic Analysis Method on Tidal Factor and Phase of the Dadianzi Well Water Level

The water level response sensitivity to crustal dynamic process has been proved by the tide water level effect, air pressure effect, and seismic wave records.A series of observation and experiments is conducted to provide the physical basis of reliability for earthquake prediction according to groundwater dynamics.When the mechanical state and external observation environment medium remained constant, changes in the physical properties of the crust medium reveal change in the tidal waves.Therefore, accurate determination of the variation characteristics of tidal water wells may eliminate the importance of tidal factors in the work of earthquake prediction to improve measurement efficiency and also eliminate the utilization of measurement data.Tidal harmonic analysis is an effective method for evaluating the intrinsic quality of well data, which is vital for improving the quality of monitoring data analysis.In this method, digital filtering is used to analyze changes in water level observation data to objectively evaluate the well observation data.Groundwater level in wells is affected by the solid Earth tide, barometric pressure, fault creep, and seismic waves and is thus sensitive to crustal dynamic process.In this study, hourly data was obtained in Dadianzi well, Chifeng, Inner Mongolia, for 156 months from May 2001 to April 2014.The Venedikov tidal harmonic analysis method was used to calculate the tide factor and phase of water level raw data.After eliminating air pressure, rainfall data recorded by the well in Dadianzi were analyzed.The results indicate that tensile stress increased well porosity before the medium-strong earthquakes, which led to this seismic activity.In addition, two cases of wave phase in strong earthquakes are mainly related to phase lag, and the phase of wave interference is eliminated after obvious lag.The M2 wave tide factor and phase in the two cases are very close, which indicated that by using Venedikov tidal harmonic analysis method can reduce the influence of precipitation and the pressure of non-body strain factors on well water level tidal observations to a great extent, which can ensure the reliability and stability of this observation.We obtained good consistency and determined the relevance between tidal factors and phase lag by adopting the Venedikov tidal harmonic analysis method.For well points lacking supplementary observation of barometric pressure and precipitation, we can obtain more reliable parameters such as tidal factor and phase lag by adopting this method to analyze the original data directly.