贵港市近3年来地下水位动态变化特征

Dynamic variation characteristics of groundwater level in Guigang City in recent three years

通过八塘、港城、大汶和铜鼓滩4个地下河地下水监测站点的数据,揭示贵港市近3年来地下水位变化特征。八塘地下河水位常年保持较为稳定的特征,水位常年保持在47 m左右,变化幅度不明显;港城地下河水位仅在2020年12月前后出现明显的下降,其余时间较为稳定;大汶地下河水位出现周期性变化特征,在1月份前后呈现了全年的低值,高值则呈现在每年的6、7月份;铜鼓滩地下河水位呈现明显的周期性变化特征,变化幅度大,特征性明显。根据4个站点的特征规律,通过岩性、气候、地表径流和人为因素等,探讨地下水位变化的主要制约条件,揭示近年来贵港市地下水位变化的主要受控因素。

Based on the data of four groundwater monitoring stations including Batang, Gangcheng, Dawen and Tonggutan underground rivers, the variation characteristics of groundwater level in Guigang City in recent three years are demonstrated. The groundwater level at Batang is relatively stable and maintains at about 47m throughout the year without obvious change range. The groundwater level at Gangcheng decreased significantly before and after December of 2020 and remained stable for the rest of time. The groundwater level of Dawen underground river changes periodically, showing the lowest value around January and the highest value in June and July. The groundwater level of Tonggutan underground river shows obvious periodic variation characteristics with large variation range. Based on the characteristics and rules of the four sites, the main restrictive factors of groundwater level change are discussed in respects of lithology, climate, surface runoff and human factors. Main control factors of groundwater level change in Guigang City in recent years are revealed.