MOE Key Laboratory of Groundwater Circulation & Environment Evolution and School of Water Resources and Environment, China University of Geosciences-Beijing, Beijing 100083, China.
MOE Key Laboratory of Groundwater Circulation & Environment Evolution and School of Water Resources and Environment, China University of Geosciences-Beijing, Beijing 100083, China.
Mar Pollut Bull. 2023 Jul;192:115092. doi: 10.1016/j.marpolbul.2023.115092. Epub 2023 Jun 6.
In this study, geochemical tracers (radium isotopes) and heavy metals (Pb, Zn, Cd, Cr and As) were analyzed to derive the submarine groundwater discharge (SGD) and associated metal fluxes during four seasons in an urbanized bay (Daya Bay, China). Results showed that Pb and Zn were the main pollutants in bay water. SGD was found to exhibit an obvious seasonal trend (autumn > summer > spring > winter). Such seasonal patterns may be related to the hydraulic gradient between groundwater level and sea level, storm surges and tidal range. SGD was a dominant source of marine metal elements, contributing 19 %-51 % of the total inputs of metals into Daya Bay. The bay water was classified as slight pollution to heavy pollution, which could be linked to SGD-derived metal fluxes. This study provides a better understanding of the important role that SGD plays in metal budgets and ecological environments of coastal waters.
本研究采用镭同位素和重金属（Pb、Zn、Cd、Cr 和 As）等地球化学示踪剂，分析了城市化海湾（中国大亚湾）四季的地下海水排泄（SGD）及其相关金属通量。结果表明，Pb 和 Zn 是海湾水中的主要污染物。SGD 表现出明显的季节性趋势（秋季>夏季>春季>冬季）。这种季节性模式可能与地下水位与海平面之间的水力梯度、风暴潮和潮差有关。SGD 是海洋金属元素的主要来源，占大亚湾金属总输入量的 19%-51%。湾水被归类为轻度污染到重度污染，这可能与 SGD 引起的金属通量有关。本研究更好地了解了 SGD 在沿海水域金属收支和生态环境中的重要作用。
