Cross Wavelet Analysis of Groundwater Level Regimes and Precipitation Groundwater Level Regime in Ji’nan Spring Region
Received date: 2012-04-22
Revised date: 2012-07-01
Online published: 2012-09-10
Based on observations of eight groundwater level regime observational points from 1998 to 2009 in Jinan spring region and the precipitation amount from 1988 to 2009, by adopting the methods of continuous wavelet transform, cross wavelet transform and cross phase, the paper analyzes the multipletimescale characteristics of groundwater level regime, its correlation with each other, as well as response to precipitation. Conclusions are drawn as follows: The region is of obvious 0.82~1.16 years significant oscillation periods with 1.95~3.09 years of lowfrequency oscillation occurring in some areas with no obvious highfrequency oscillation period. Observations from three dot pairs, the Tuwu villageWater Group Co, Xiaozhuang villageKuangli village, and Laoshigou villageRoyal Heights established to investigate the main runoff of the region by analyzing cross wavelet transforms of groundwater level regime and precipitationgroundwater level regime show that the water level regime of the nether observational points lag behind that of the upper ones respectively by 9.41, 11.90, 33.97 d and 5.63, 17.73, 31.87 d. Water abundance of the region is also surveyed and it is believed that water abundance has impact on timedelay characteristic of groundwater level regime and that larger figures occur in weak abundance sections while small ones in strong water abundance sections. The four observational points, the parking lot 102, Xiaozhuang village, Water Group Co, Dayu Village in strong water abundance sections show similar groundwater level fluctuations, which is resulted from basically simultaneous runoff supply or strong runoff. The groundwater level regime in Laoshigou village lags behind precipitation by 73.06 d, other observational points by 101.11~134.42 d, indicating that there is significant timedelay between groundwater level regime and precipitation, and also that the longer the groundwater runoff distance, the longer the timedelay is. Based on cross wavelet transform of groundwater level regime and precipitationgroundwater level regime, most observational points get close timedelay, despite a few different figures due to difference in precipitation data, observation time and precipitation recharge mechanism, etc. Under the same observation time in cross wavelet transform of groundwater level regime, a functional relationship is found between the total timedelay sum of part dot pairs and that of the whole dot pairs in the same runoff areas. Thus, cross wavelet can be analyzed to investigate correlation between groundwater level regime and precipitation of a region.
Qi Xiaofan , Yang Lizhi , Han Ye , Shang Hao , Xing Liting . Cross Wavelet Analysis of Groundwater Level Regimes and Precipitation Groundwater Level Regime in Ji’nan Spring Region[J]. Advances in Earth Science, 2012 , 27(9) : 969 -978 . DOI: 10.11867/j.issn.1001-8166.2012.09.0969
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