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Two‐Decadal Variability of Lacustrine Groundwater Discharge: Coupled Controls From Weather and Hydrologic Changes
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Two‐Decadal Variability of Lacustrine Groundwater Discharge: Coupled Controls From Weather and Hydrologic Changes
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Journal Article
Two‐Decadal Variability of Lacustrine Groundwater Discharge: Coupled Controls From Weather and Hydrologic Changes
2024
Overview
Lacustrine groundwater discharge (LGD) is a vital water and solute source for lakes. However, the understanding of the long‐term temporal variability of LGD remains limited owing to insufficient insights into driving mechanisms, such as climatic and hydrologic changes. In this study, we examined the oxbow lake group in the central Yangtze River (YR) and assessed the LGD rates from 2000 to 2022 using 222Rn combined with meteorological and hydrological data. The findings revealed that groundwater was recharged during the wet season and discharged to the lakes during the dry season. We established a mathematical model to link the LGD rates to the meteorological and hydrological factors of the lakes, which accounted for 98.70% of the LGD rate variance. Using a predictive model combined with meteorological and hydrological data to assess the LGD rate over the past two decades, it was found that in wet years with higher precipitation and higher average YR water levels, the LGD rate was higher. The gradual increase in precipitation during the rising water and wet seasons, along with a slow rise in the YR water levels, will cause the LGD rate to exhibit a slightly increasing trend with fluctuations in the future. This study proposed an innovative approach to investigate the long‐term temporal variation in LGD and identify the weather and hydrological influences on LGD. Plain Language Summary Lacustrine groundwater discharge (LGD) is an important water and substance source for lakes. However, long‐term temporal variability of LGD is poorly understood due to limited knowledge of driving mechanisms such as climatic and hydrologic change. In this study, we focused on the oxbow lake group within central Yangtze River, and estimated LGD rates from 2000 to 2022 with meteorological and hydrological data. A mathematical model is established to correlate the LGD rates with meteorological and hydrological factors of the lakes. The simulated LGD rates in 2000–2022 show that the years with higher precipitation and higher water levels in the Yangtze River correspond to larger LGD rates. Additionally, future prediction suggests continuously increasing LGD rates. This study introduces an innovative approach to explore LGD's long‐term temporal variability and identifies the regulation of weather and hydrology on LGD. Key Points A great relationship (R2 = 0.987) between Lacustrine groundwater discharge (LGD) rates and meteorology and hydrology is established Meteorology and hydrology jointly regulate two‐decadal variability of LGD, with higher LGD during wet years and lower LGD during dry years LGD rates will exhibit a slightly increasing trend with fluctuations in the future under climatic and hydrologic changes
