2002年10月以来昌黎井水位趋势上升分析

Analysis on the tendency rising of groundwater level in Changli well since October of 2002

2002年10月昌黎井井口装置进行改造,改造之后排水口变小,引起了水位趋势上升变化。进入2003年4月以来,该井水位继续上升,无转折迹象。与往年同期比较,2002年10月以来的上升呈现上升幅度大、上升速率快的特点。由此对"改造出水装置引起水位上升"提出疑问,该井水位目前上升幅度大和上升速率快,到底是否地震异常?针对这一关键问题,做了以下分析工作:地下水储量变化对井水位升降的影响;同一观测井多个测项的对比分析;解释了井孔出水管变细引起水位上升幅度大、上升速率快的机理,认为是地震短临异常的可能性较小。

the device in the mouth That the waterspout became small after of Changli Well was reconstructed in Oct. 2002. the reconstruction caused the groundwater level rising. Since Apr. 2003, the water level keep rising, and no sign of turning. As the magnitude of rising was large, and the rate is fast compared with the same period of past years since Oct. 2002, the reconstruction caused the water level rising is questioned. About whether it is a earthquake anomaly, we have made the following analysis： the effect of variation in ground water reserves on the rising and dropping of water level; comparison in the surveying approaches of the same well. Through analysis of mechanism we concluded that the variation in water level might not be earthquake anomaly.