Estimation of groundwater discharge and associated chemical fluxes into Poyang Lake, China: approaches using stable isotopes (δD and δ18O) and radon

Spatiotemporal Variation of Groundwater Recharge in the Lower Reaches of the Poyang Lake Basin, China: Insights From Stable Hydrogen and Oxygen Isotopes

“…The groundwater flows from the hills and mountains to the alluvial plain across different aquifers (Figure 1a), which is consistent with the direction of elevation decline (Zhan et al., 2016). Additionally, compared with the surface water level, the groundwater table around the lake is generally higher, and groundwater is mainly discharged to surface water (Liao, Wang, Shi, Cheng, et al., 2018).…”

“…Located on the lower reaches of the Yangtze River, Poyang Lake drains into the Yangtze River via a narrow outlet in the north and influences the hydrological characteristics of the Yangtze River Basin (Lai et al., 2014). As the recharge source of lake water, groundwater in Poyang Lake Basin is an indispensable and available resource and plays an extremely important role in the development of social economy and ecology (Liao, Wang, Shi, Cheng, et al., 2018). However, the Poyang Lake Basin has suffered serious ecological environment issues in recent years, such as prolonged droughts, wetland degradation, and water eutrophication (Ye et al., 2013; Zhang et al., 2012).…”

“…Precipitation is unevenly distributed throughout the year where more than half of annual precipitation is concentrated between March and June (Zhan et al., 2016), which contributes to the inhomogeneous recharge of groundwater throughout the year (Shen et al., 2015). In addition, the aquifer types, lithology and soil thickness vary spatially in study area (Liao, Wang, Shi, Cheng, et al., 2018; Zhang et al., 1982). Therefore, the spatial and temporal variations of groundwater recharge could have distinctive characteristics in Poyang Lake Basin, which are important for the fundamental understanding of the hydrologic circulation and effective management of groundwater resources.…”

Contrasting lacustrine groundwater discharge and associated nutrient loads in different geological conditions

“…2). The mass-balance model can be expressed as (Dabrowski et al, 2020;Sun et al, 2020;Liao et al, 2018;Luo et al, 2016;Schmidtet al, 2009;Kluge et al, 2007):…”

“…Although various methods of quantifying LGD exist (Tecklenburg and Blume;Dimova et al, 2015;Lewandowski et al, 2013;Stets et al, 2010), radioactive 222 Rn tracing has been widely and effectively used in recent years (Wallace et al, 2021(Wallace et al, , 2020Dabrowski et al, 2020;Hare et al, 2017;Petermann et al, 2018;Liao et al, 2018;Luo et al, 2018Luo et al, , 2016Luo et al, , 2014Burnett et al, 2017;Dimova et al, 2015Dimova et al, , 2013Gilfedder et al, 2015;Peterson et al, 2010;Schmidt et al, 2010Schmidt et al, , 2009. 222 Rn is a subset of 226 Ra and is widely present in inland rocks and water bodies.…”