采用相关分析法研究降雨对水位的影响

Study on Impact of Rainfall on Water Level via Correlation Analysis

地下水位动态受降雨影响显著,且由于降雨的持续时间、强度和面积的不同,由降雨引起的水位变化形态也复杂多样。为了能直观地判别降雨对水位的影响,排除水位资料中降雨的影响成分,本文采用水位月变化量与降雨月累计值作相关分析后得到的余差值,作为水位微动态研究对象。选用与降雨关系分别为显著、一般、不相关的连江江南井、泉州局一号井、福州浦东井水位进行分析,结果显示水位月变化量均表现了高值异常,异常与地震时间的对应关系有3个震前异常,2个同震异常、1个震后效应、1个无震异常。

The regime of groundwater level is significantly affected by rainfall.Different duration,intensity and area of rainfall also lead to complicated and diverse water level variation patterns.In order to intuitively distinguish the impact of rainfall on water level and exclude the rainfall impact in the water level data,this Paper uses the increment value,which is resulted from relevant analysis on the monthly water level variation and the monthly rainfall integrated value,as the object of study for water level micro-dynamic variation.The Paper analyzes the water levels of the Lianjiang Jiangnan Well,Quanzhou Seismostation Well No.1 and Fuzhou Pudong Well that are significantly related,generally related and irrelevant to the rainfall respectively,and arrives at the conclusion that,high value anomaly are found from all the monthly water level variations,including 3 pre-seismic and 2 coseismic anomalies,1 post-seismic effect,and 1 aseismic precursory anomaly.