Article
Environmental Sciences
Yujeong Choi, Kyungsun Yang, Min Young Lee, Suk Hyun Youn, Moonho Son, Sang Rul Park, Tae-Hoon Kim
Summary: By studying SGD and nutrient fluxes in Ihotewoo Bay and Bangdu Bay, Jeju Island, Korea from November 2019 to July 2020, it was found that tidal pumping is the primary driving mechanism of SGD. Although the average annual SGD-driven nutrient fluxes were 24-37% lower in Bangdu Bay than in Ihotewoo Bay, massive Ulva blooms only occurred in Bangdu Bay, which can be attributed to longer residence time and continuous SGD input with high dissolved inorganic nitrogen.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Shibin Zhao, Bochao Xu, Qinzhen Yao, W. C. Burnett, M. A. Charette, Rongguo Su, Ergang Lian, Zhigang Yu
Summary: The research indicates that Subei Shoal in the Southern Yellow Sea of China may be the epicenter of the world's largest green tide outbreaks, which are linked to high submarine groundwater discharge in the area. Submarine groundwater discharge is a key feature of shallow coastal waters in this region. Nutrients derived from SGD are crucial for the growth of macroalgae and may outweigh other nutrient sources. Specific types of areas, such as sandy or muddy areas with pollution and heavy bio-irrigation, could face significant ecological challenges even with limited terrestrial runoff.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yunhai Fang, Tianyuan Zheng, Xilai Zheng, Huiyu Yang, Huan Wang, Marc Walther
Summary: Recent studies have shown that tide-induced unstable flow affects groundwater flow and salinity distribution, with unstable upper saline plume states impacting submarine groundwater discharge and seawater intrusion. The study also found that variations in physical forcing conditions lead to transitions in the stability of the upper saline plume and fluctuations in water exchange across the aquifer-sea interface.
WATER RESOURCES RESEARCH
(2021)
Article
Water Resources
Raymond D. Craddock, Gavin W. Kennedy, Rob C. Jamieson, Jonathan Keizer, Aaron A. Mohammed, Barret L. Kurylyk
Summary: This study focuses on understanding the pathways of groundwater flow and associated solute transport to the ocean in Mabou Harbour, Nova Scotia, Canada. The results show that seaward stream baseflow exceeds direct submarine groundwater discharge (SGD) in this till dominated coastal aquifer. The majority of SGD originates in the subcatchment surrounding the harbour, indicating limited intermediate or regional flow. The shorter flow paths and residence times for direct SGD may have implications for groundwater contamination in this harbour.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Ecology
Poornima Unnikrishnan, Reji Srinivas, Murugan Ramasamy, D. S. Suresh Babu
Summary: The study investigated submarine groundwater discharge and its behavior influenced by coastal geomorphology and geology. Numerical models were developed to estimate the magnitude of SGD from different catchments on the Southwest coast of India. The results showed significant differences in SGD flux between catchments, with potential implications for designing aquifer recharge options and optimum pumping quantities.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Yuxuan Hou, Jie Yang, Christopher J. Russoniello, Tianyuan Zheng, Mei-lin Wu, Xuan Yu
Summary: Shrimp aquaculture can lead to groundwater salinization and increased submarine groundwater discharge (SGD), but research on this topic is limited. In this study, a numerical simulation approach was used to assess the impacts of shrimp farm irrigation on groundwater salinization and SGD. The results showed that pond water depth had a primary control on the mass of saltwater infiltration, while farm width had a primary control on recovery rate. Both pond water salinity and depth affected fresh and saline SGD. This study highlights the previously unrecognized mechanism of aquaculture on coastal aquifer vulnerability and SGD, emphasizing the need for further research on the impact of aquaculture on coastal groundwater resources.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Xiaolong Geng, Holly A. Michael
Summary: The study highlights the significant role of three-dimensional groundwater movement in heterogeneous coastal aquifers, especially in systems with connected high-permeability geological features. Three-dimensional flowpaths and travel times are longer compared to two-dimensional in onshore areas, but shorter offshore, particularly in conduit-type models with highly preferential flow. Flowpath lengths and travel times vary greatly in three-dimensional simulations compared to two-dimensional across all heterogeneous systems.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Xuan Yu, Holly A. Michael
Summary: Numerical models of variable-density groundwater flow and salt transport are crucial for predicting salinity distributions in coastal aquifers and estimating submarine groundwater discharge. The study found that the scale of representation of heterogeneity significantly impacts salinity distributions and flow paths, and simulated density distributions control both the rate and direction of subsurface saltwater circulation.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Environmental
K. H. Cheng, Xin Luo, Jiu Jimmy Jiao, Shengchao Yu
Summary: Storm events can stimulate the growth of subsurface E. coli and accelerate their exports into coastal waters. The findings are important for preventing coastal water pollution and managing coastal safety during extreme weather events.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Geosciences, Multidisciplinary
Yi Liu, Yurong Song, Jiu Jimmy Jiao
Summary: Coastal ocean acidification is a global problem due to climate change, and the study reveals a close relationship between submarine groundwater discharge (SGD) and coastal ocean acidification in Hong Kong's coastal waters. The direct influence of SGD on seawater pH decline is evaluated for the first time, and the results show that SGD contributes significantly to seawater pH variation through direct input of carbonate species. In addition, SGD also affects seawater pH through nutrient loadings. Understanding and managing groundwater is crucial in mitigating coastal ocean acidification.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Tybaud Goyetche, Linda Luquot, Jesus Carrera, Laura Martinez-Perez, Albert Folch
Summary: In coastal aquifers, seawater intrusion and submarine groundwater discharge are two opposing processes that require characterization and quantification to assess the quality and composition of the water. This study proposes a methodology using principal component analysis to identify water sources and reactions, and quantify mixing ratios and the extent of chemical reactions. The research highlights the importance of cation exchange and its impact on other reactions, as well as the spatial distribution of reactions in the aquifer.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Wei Wen Wong, Ian Cartwright, Seng Chee Poh, Perran Cook
Summary: The study utilized stable and radiogenic isotopes along with nitrogen concentrations to evaluate nitrogen sources and cycling processes in Port Phillip Bay, Australia, highlighting the importance of terrestrial-coastal interactions and submarine groundwater discharge as significant pathways of nitrogen inputs. The high nitrogen concentrations were attributed to nitrified sewage effluent, atmospheric deposition, and groundwater and sewage inputs. More efforts are needed to quantify the relative contributions of multiple nitrogen input pathways in future research.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Civil
Maxime Savatier, Carlos Rocha
Summary: Studies have shown that different marine tracer-based methods can lead to large discrepancies in estimating submarine groundwater discharge, while Estuarine dynamic model based on transect data may provide more accurate results.
JOURNAL OF HYDROLOGY
(2021)
Article
Multidisciplinary Sciences
Kyeong-Tae Lee, Hye-Mi Lee, Thatchaneshkanth Subramaniam, Hyun-Sung Yang, Sang Rul Park, Chang-Keun Kang, Shashank Keshavmurthy, Kwang-Sik Choi
Summary: This study investigated the distribution of Alveopora japonica and other benthic communities in shallow subtidal areas around Jeju Island. The results showed that A. japonica colonies were most abundant at Bukchon site, while canopy-forming brown algae dominated at Seongsan site and non-geniculate coralline algae dominated at Shinheung site. This study provides important baseline information for understanding climate change related changes in benthic communities.
Article
Environmental Sciences
Kai Xiao, Peng Zhang, Isaac R. Santos, Jun-Jian Wang, Zhenyang Li, Xuejing Wang, Ying-Hui Wang, Meiqing Lu, Licong Zhang, Hailong Li
Summary: Dissolved organic matter (DOM) in highly productive intertidal mangroves plays a significant role as a carbon and nutrient source in the coastal ocean. The influence of groundwater flow on DOM properties and fluxes remains poorly understood. This study highlights the importance of tidal hydrology in controlling groundwater DOM characteristics.
WATER RESOURCES RESEARCH
(2023)