井水位的“记忆”滞后效应

THE EFFECT OF "MEMORY" LAG OF WELL LEVEL

观测资料表明，井水位对信息响应存在“记忆”滞后现象，它与一般的位相滞后不同。在鲁29并现场试验也证明了井水位对井口空气压力变化的响应存在“记忆”滞后现象。利用水平层状承压含水层模式，从理论上解释了井水位对井口空气压力变化响应的“记忆”滞后现象，认为这种现象与水井含水层的导水系数有关，含水层导水系数越小，这种现象越明显。用一般多元回归方法无法较好地扣除井水位中“记忆”滞后影响，作者给出了一种可以扣除这种影响的新方法。利用此方法处理了鲁03并观测资料，求出该井水位固体潮系数为1．8mm／10-8，水位对固体潮滞后时间1．53h；气压系数6．4mm／hPa，滞后时间1．50h。用新方法改正后的水位中误差明显减小，改正效果较好。

It is shown from the observational data that of 'memory' lagin response to the information of well level. It is different from general phase lag- Theon-the-spot experiment in the well Lu-29 is also shown the phenomenon of 'memory' lagin water level response to the change of air pressure- Using a model of the pressuredaquifer with horizontal layers, the phenomenon of 'memory'lag in water level response tothe change of air pressure is theoretically explained- It is considered that the phenomenonis related to the transmissibility in the well aquifer. The lower the transmissibility of theaquifer is, the more obvious phenomenon of 'memory' lag will be. It is difficult to removethe influence of 'memory' lag in the well water level by using the general multipleregression. In this paper, a new method to remove this influence is proposed. Theobservation data in the well Lu-03 are processed by using this method, and the resultshows that the tidal coefficient of the well water level is 1. 8 mm/1O-8, the lag time of thewell water level to the earth tide is 1. 53 h, the barometric coefficient is 6- 4 mm/hPa andlag time is 1. 5O h. The standard deviation of the water level corrected by the new methodevidently decreases- The corrected result is better.