scholarly journals Global Research Trends and Hotspots on Submarine Groundwater Discharge (SGD): A Bibliometric Analysis

2020 ◽  
Vol 17 (3) ◽  
pp. 830 ◽  
Author(s):  
Qian Ma ◽  
Yan Zhang
Keyword(s):  
Bibliometric Analysis ◽  
Submarine Groundwater Discharge ◽  
Hydrological Cycle ◽  
Research Output ◽  
Groundwater Discharge ◽  
Research Trends ◽  
Future Research ◽  
Tracer Techniques ◽  
Submarine Groundwater ◽  
Research Hotspots

Submarine groundwater discharge (SGD), a major component of the hydrological cycle, has significant impacts on the sustainable development of the marine environment. This study aimed to examine the literature characteristics and research hotspots of SGD based on Web of Science’s citation database from 1998–2019. With systematic bibliometric analysis, insights were made into multiple aspects including research output, subject categories, journals, countries/territories, institutions, authors, and hotspots and research trends. Results showed that the current amount of publications on SGD has increased exponentially. The characteristics of multi-subject, active international and inter-institutional collaborations were identified. There were 11 core journals publishing the research on SGD, and the number of covered journals increased linearly from 1998. USA had distinct advantages in publication outputs and took the core position in international collaborations. At present, the research hotspots of SGD mainly include the following: dynamics process and estimation of SGD with hydrogeological methods, tracer techniques, geochemical process in subterranean estuary, and dissolved material inputs to coastal waters via SGD. Citation analysis implied much development space in carbon flux transported by SGD and the implement of head as groundwater tracer. These results provided an instructive perspective of the present situation and future research direction on SGD.

Estimating coastal mixing rates and submarine groundwater discharge (SGD) in Guangdong-HongKong-Macau Greater Bay Area, China using radium isotopes

2020 ◽  
Author(s):  
Xuejing Wang ◽  
Hailong Li ◽  
Chunmiao Zheng
Keyword(s):  
Diffusion Coefficient ◽  
Submarine Groundwater Discharge ◽  
Hydrological Cycle ◽  
Groundwater Discharge ◽  
Balance Model ◽  
Material Transport ◽  
Radium Isotopes ◽  
Bay Area ◽  
Submarine Groundwater ◽  
Mixing Rates

<p>As a major component of the hydrological cycle, submarine groundwater discharge (SGD) has been widely recognized as a significant source of water and an important pathway for dissolved material transport from land to ocean. Natural radium isotopes are recognized as ideal tracers for effective and efficient assessment of SGD in local scales and global scales since they are conservative chemically and widely enriched in SGD. Here we report the estimates of coastal mixing rates and SGD in Guangdong-HongKong-Macau Greater Bay Area, China using radium isotopes. The distributions of short-lived <sup>223</sup>Ra, <sup>224</sup>Ra and long-lived <sup>228</sup>Ra in seawater and coastal groundwater were investigated. Based on the horizontal distribution of short-lived Ra and a mixing model, the horizontal eddy diffusion coefficient in the region was estimated to be 230-1085 m<sup>2</sup>/s. The offshore fluxes of <sup>228</sup>Ra can be derived from their across-shelf activity gradients and the eddy horizontal diffusion coefficient. Such <sup>228</sup>Ra fluxes require a substantial volume of groundwater discharge to balance Ra removal, and thus SGD can be estimated via radium mass balance model.</p>

scholarly journals Synthesizing the Effects of Submarine Groundwater Discharge on Marine Biota

Hydrology ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 60 ◽  
Author(s):  
Alanna Lecher ◽  
Katherine Mackey
Keyword(s):  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Future Research ◽  
Marine Biota ◽  
Marine Plants ◽  
Submarine Groundwater ◽  
Ecosystem Studies ◽  
Iron Nickel ◽  
Organismal Complexity ◽  
Physical Changes

Submarine groundwater discharge (SGD) is a global and well-studied geological process by which groundwater of varying salinities enters coastal waters. SGD is known to transport bioactive solutes, including but not limited to nutrients (nitrogen, phosphorous, silica), gases (methane, carbon dioxide), and trace metals (iron, nickel, zinc). In addition, physical changes to the water column, such as changes in temperature and mixing can be caused by SGD. Therefore SGD influences both autotrophic and heterotrophic marine biota across all kingdoms of life. This paper synthesizes the current literature in which the impacts of SGD on marine biota were measured and observed by field, modeling, or laboratory studies. The review is grouped by organismal complexity: bacteria and phytoplankton, macrophytes (macroalgae and marine plants), animals, and ecosystem studies. Directions for future research about the impacts of SGD on marine life, including increasing the number of ecosystem assessment studies and including biological parameters in SGD flux studies, are also discussed.

scholarly journals Investigation of Submarine Groundwater Discharge using Thermal Satellite and Radon mapping along the East Coast of the Tamil Nadu and Pondicherry Region, India

2021 ◽  
pp. 1-18
Author(s):  
Rajesh Kanna A ◽  
Srinivasamoorthy K ◽  
Ponnumani G ◽  
Babu C ◽  
Prakash R ◽  
...  
Keyword(s):  
Submarine Groundwater Discharge ◽  
Tamil Nadu ◽  
Hydrological Cycle ◽  
Chemical Constituents ◽  
Groundwater Discharge ◽  
Thermal Infrared ◽  
Landsat 8 ◽  
Infrared Images ◽  
Thermal Infrared Images ◽  
Submarine Groundwater

Submarine groundwater discharge (SGD) demarcated as a significant component of hydrological cycle found to discharge greater volumes of terrestrial fresh and recirculated seawater to the ocean associated with chemical constituents (nutrients, metals, and organic compounds) aided by downward hydraulic gradient and sediment-water exchange. Delineating SGD is of primal significance due to the transport of nutrients and contaminants due to domestic, industrial, and agricultural practices that influence the coastal water quality, ecosystems, and geochemical cycles. An attempt has been made to demarcate the SGD using thermal infrared images and radon-222 (222Rn) isotope. Thermal infrared images processed from LANDSAT-8 data suggest prominent freshwater fluxes with higher temperature anomalies noted in Cuddalore and Nagapattinam districts, and lower temperature noted along northern and southern parts of the study area suggest saline/recirculated discharge. Groundwater samples were collected along the coastal regions to analyze Radon and Physico-chemical constituents. Radon in groundwater ranges between 127.39 Bq m-3 and 2643.41 Bq m-3 with an average of 767.80 Bq m-3. Calculated SGD fluxes range between -1.0 to 26.5 with an average of 10.32 m day-1. Comparison of the thermal infrared image with physio-chemical parameters and Radon suggest fresh, terrestrial SGD fluxes confined to the central parts of the study area and lower fluxes observed along with the northern and southern parts of the study area advocate impact due to seawater intrusion and recirculated seawater influence.

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