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利用1988—2009年济南泉域8个地下水位动态观测点不同时段观测资料及1998—2009年降水数据,采用连续小波变换、交叉小波变换方法对济南泉域地下水位动态的多时间尺度特征、相互关系及其对降水的响应进行了分析。结果表明:①济南泉域地下水位动态存在显著的0.82～1.16 a的主振荡周期,低频部分仅在部分年份存在1.95～3.09 a的振荡周期;②含水岩组富水性对地下水位动态存在影响,研究区主径流方向上弱富水性地段地下水位动态时滞较强富水性地段长,强富水性地段4个观测孔地下水位波动时序基本一致;③地下水位动态对降水的响应滞后明显,为73.06～134.42 d,总体表现为地下水径流路径越长,响应越滞后;④基于地下水位动态与基于降水—地下水位动态交叉小波变换得到的观测点对水位动态的滞后时间多数一致,同一径流路径上局部点对滞后时间之和与全局点对有很好的对应关系。交叉小波分析可定量评价泉域地下水位动态及其与降水的相关关系。
Based on the observation data of dynamic observation points of eight groundwater levels in Jinan spring from 1988 to 2009 and the precipitation data from 1998 to 2009, the multi-time scale features of groundwater level dynamics in Jinan spring were studied by using continuous wavelet transform and cross-wavelet transform. The relationship and its response to precipitation were analyzed. The results show that: (1) There is a significant main oscillation period of 0.82-1.16 a in groundwater level of Jinan spring basin, and an oscillation period of 1.95-3.09 a at low frequency part only in some years; (2) Water richness of water-bearing rock mass has an influence on groundwater level dynamic, In the study area, the dynamic time-lapse of the groundwater table in the weak and water-rich sections of the main runoff is long and the fluctuation time series of the groundwater table in the four observation holes in the strong and rich water sections are basically the same. The response lag of the groundwater table to precipitation is 73.06 ~ 134.42 d, the overall performance of the groundwater runoff path is longer, the response lags behind; ④ based on the groundwater level dynamic and cross-wavelet transform based on precipitation - groundwater table dynamic cross-wavelet transform dynamic lag time most of the same runoff path on the same local The sum of lag time and global point pair has a good correspondence. Cross wavelet analysis can quantitatively evaluate the dynamic state of groundwater level and its correlation with precipitation.