Citation: | KE Xianzhong, ZHANG Xu, ZHANG Yanpeng, LI Qinghua, XIE Xianjun, CHEN Wenfeng. Submarine groundwater discharge and its impact on mangrove habitats in Dongzhaigang Area, Northeastern Hainan Island[J]. Hydrogeology & Engineering Geology, 2025, 52(3): 43-55. doi: 10.16030/j.cnki.issn.1000-3665.202409062 |
Submarine groundwater discharge (SGD) is a significant yet often overlooked pathway for material exchange between terrestrial and marine environments, delivering freshwater and nutrients to coastal ecosystems and influencing mangrove wetland health. Salinity balance and environmental quality are key factors in maintaining healthy mangrove habitats, yet the role of SGD in shaping these conditions in Dongzhaigang Area, northeastern Hainan, remains poorly understood. Moreover, the importance of groundwater considerations in mangrove ecological protection and restoration requires further exploration. This study investigated SGD characteristics and its ecological impacts on mangrove wetlands in Dongzhaigang Area using radon isotope (²²²Rn) as a natural tracer. The spatial and temporal variations of seawater 222Rn activity and its influencing factors were analyzed. Based on the 222Rn mass-balance model, the fluxes of SGD and the associated nutrients in Dongzhaigang Area were estimated. The findings indicate that the variation in 222Rn activity is predominantly influenced by the seasonal rainfall, tidal water level fluctuation, fracture zone structure, and the nature of surface sediments. Using the 222Rn mass balance model for the region, SGD fluxes were estimated to be 8.90×105 m3/d and 6.84×105 m3/d in the wet season and dry season, respectively; SGD-driven nutrient fluxes were estimated by combining the solute concentrations in groundwater. The fluxes of phosphate, nitrite, and nitrate were estimated to be
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Location of the study area and the sampling sites
Seawater 222Rn activity variation in Dongzhaigang Area during the wet and dry seasons
Correlation of seawater 222Rn activity with environmental factors in Dongzhaigang Area
222Rn activity variation over a tidal cycle in Dongzhaigang Area
Schematic representation of the source-sink terms of the 222Rn mass balance model in Dongzhaigang Area