4/18/2023 0 Comments Correlation jmp![]() ![]() Agricultural water accounts for 76% of water resource consumption in this area, and more than 80% of agricultural irrigation water comes from groundwater. ![]() The Heilonggang region is located in the southeast of Hebei Province ( Figure 1), a part of the North China Plain, and serves as an important agricultural planting area for the nation. Although there are many studies investigating the relationship between rainfall and aquifers, seldom does research focus on areas facing severe water shortage such as the Heilonggang region, China. show that the response time of groundwater levels to rainfall during 2006–2018 extended from 80 to ~190 days in Puyang, Henan, China, and that it increases with the burial depth of groundwater. 36 days, and the relationship between groundwater depth and precipitation is largely affected by land use types, soil texture, and micro-geomorphic types. found that the time lag of groundwater depth to precipitation in the Yellow River Delta during 2006–2010 ranged from 35. Based on the cross wavelet and wavelet coherence methods, Yu and Lin found that the temporal lag from rainfall to groundwater was about 3.71–72.07 days for the Pingtung Plain in Taiwan. Instead, the wavelet transform method is an effective tool for detecting the periodicity of a nonlinear system and can provide localized intermittent periodicities. This research helps us better understand the local groundwater circulation and provide references for groundwater management.Īlthough correlation and spectral analysis have been widely used in hydrology and hydrogeology, these methods cannot describe how the frequency of a signal changes with time. The recharge ratio overestimated by the water table fluctuation method decreases from 0.32 at W2 to 0.17 at W4, suggesting that the site W2 has a good potentiality for groundwater recharge. The lags for the pumping years are 1.2~2.1 times of those during the years without pumping. The dominant time period increases from 2.1 years (upstream) to 3.7 years (downstream). The results show that the groundwater levels at W1 and W2 present a downward trend while those at W3 and W4 show an upward trend. Based on observations from four monitoring wells, the persistence and periodicities of the loose porous aquifers, and the interrelation between precipitation and groundwater levels was examined based on a number of tools including autocorrelation, cross-correlation, spectral analysis, and wavelet transform. To clarify the long-term dynamics of groundwater and its response to precipitation in the Heilonggang region, China, variation trends of the monitored groundwater were studied according to the Mann–Kendall statistics. ![]()
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