赵各庄井水位水温演化特征及其成因分析

平谷赵各庄井深200 m, 观测含水层为182 m以下的全井段, 是浅层冷水和深层热水的混合水。 受开采及降雨影响, 水位、 水温长趋势及年动态具有同步协调性变化, 地下水开采使井筒内冷水比例变小, 水位下降, 水温上升; 降雨渗入补给使流入观测井筒内冷水占比例变大, 水位上升, 水温下降, 但雨季结束, 井筒内冷水流入量变少, 井水温逐渐回升。 气压和固体潮使井筒与含水层间有水流运动, 水位出现周期性波动, 从而改变井筒内冷热水比例, 引起水温周期性变化的次生效应, 两者有短期同步协调变化。 不同种干扰因素造成了不同周期的变化影响, 在排除干扰, 提取地震异常信息时, 应选用不同方法及取样周期进行分析。

Evolution Characteristics of Water Level and Water Tem- perature in Zhao Gezhuang Well and Their Cause Analysis

The depth of Zhao Gezhuang well is 200 m. The observation aquifer is located in 182—200 m, which is a mixture of shallow cold water and deep hot water. Under the influence of mining and rainfall, the water level and water temperature have synchronous coordination changes in the long trend and annual variation. Due to groundwater exploitation, the ratio of cold water in the shaft reduces, the water level of the well decreases, and the water temperature raises. The rainfall infiltration recharge makes the cold water in wellbore increase, water level rise and water temperature drop. However, at the end of the rainy season, the inflow of cold water into the shaft decreases, and the water temperature rises gradually. The air pressure and the solid tide cause the diurnal variation of water movement between the wellbore and the aquifer, so that well water level has periodic fluctuation. This changes of the ratio of cold and hot water in the wellbore and causes the secondary effect of water temperature's periodic fluctuation. Both of them show synchronous and coordinated changes in diurnal variation. Different kind of interference factors causes different periodic change. It is necessary to choose different method and sampling period in order to eliminate the disturbance and extract the information of seismic anomaly.