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Advances in Earth Science  2012, Vol. 27 Issue (9): 969-978    DOI: 10.11867/j.issn.1001-8166.2012.09.0969
Articles     
Cross Wavelet Analysis of Groundwater Level Regimes and Precipitation Groundwater Level Regime in Ji’nan Spring Region
Qi Xiaofan1, Yang Lizhi1, Han Ye1, Shang Hao1, Xing Liting2
1.Shandong Institute of Geological Survey, Ji’nan 250013, China;2. School of Resources and Environment, University of Ji’nan, Ji’nan 250022, China
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Abstract  

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 multipletimescale 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 lowfrequency oscillation occurring in some areas with no obvious highfrequency oscillation period. Observations from three dot pairs, the Tuwu villageWater Group Co, Xiaozhuang villageKuangli village, and Laoshigou villageRoyal Heights established to investigate the main runoff of the region by analyzing cross wavelet transforms of groundwater level regime and precipitationgroundwater 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 timedelay 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 timedelay between groundwater level regime and precipitation, and also that the longer the groundwater runoff distance, the longer the timedelay is. Based on cross wavelet transform of groundwater level regime and precipitationgroundwater level regime, most observational points get close timedelay, 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 timedelay 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.

Key words:  Groundwater level regime      Precipitation      Cross phase      Cross wavelet transform      Ji’nan spring region.     
Received:  22 April 2012      Published:  10 September 2012
P641.74  
  N93  
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Qi Xiaofan
Yang Lizhi
Han Ye
Shang Hao
Xing Liting

Cite this article: 

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. Advances in Earth Science, 2012, 27(9): 969-978.

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http://www.adearth.ac.cn/EN/10.11867/j.issn.1001-8166.2012.09.0969     OR     http://www.adearth.ac.cn/EN/Y2012/V27/I9/969

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