scholarly journals Temporal changes and impacts of submarine fresh groundwater discharge to the coastal environment: A decadal case study in Toyama Bay, Japan

2013 ◽  
Vol 118 (5) ◽  
pp. 2610-2622 ◽  
Author(s):  
Mariko Hatta ◽  
Jing Zhang
Keyword(s):  
Groundwater Discharge ◽  
Temporal Changes ◽  
Coastal Environment ◽  
Fresh Groundwater ◽  
Toyama Bay

Current Magnitude and Mechanisms of Groundwater Discharge in the Arctic: Case Study from Alaska

2015 ◽  
Vol 49 (20) ◽  
pp. 12036-12043 ◽  
Author(s):  
Natasha T. Dimova ◽  
Adina Paytan ◽  
John D. Kessler ◽  
Katy J. Sparrow ◽  
Fenix Garcia-Tigreros Kodovska ◽  
...  
Keyword(s):  
Groundwater Discharge ◽  
The Arctic ◽  
Current Magnitude

Submarine groundwater discharge (SGD) in the springs of Sahlenburg tidal flat, Germany: a geochemical approach. 

2021 ◽  
Author(s):  
Roger Carvalho da Silva ◽  
Hannelore Waska ◽  
Kai Schwalfenberg ◽  
Thorsten Dittmar
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Tidal Flat ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Fresh Groundwater ◽  
Large Reservoir ◽  
Flat Area ◽  
Submarine Groundwater ◽  
Groundwater Springs

<p>Submarine groundwater discharge (SGD) is an important connection between fresh groundwater and the marine ecosystem. The scientific interest in SGD has grown considerably during the last decades due to the recognition of SGD in coastal environments as a significant source of nutrients and pollutants.  The Sahlenburg area (Northern Germany) is known by its highly permeable sediments and high rainfall precipitation that produces a large reservoir of groundwater.  Such characteristics are essential for industry, agriculture and drinking water supply with a large regional importance. In addition, this groundwater discharges in the form of highly productive springs directly into the adjacent tidal flats, with so far unknown effects on the local biogeochemistry.  The aim of this study was to characterize the spatial distribution of salinity, fluorescence dissolved organic matter (FDOM), dissolved organic matter (DOC) and total dissolved nitrogen (TDN) of the springs of Sahlenburg tidal flat area in Cuxhaven, Germany. We hypothesize that the SGD composition is changing on its way through the tidal flat due to biogeochemical factors. This may affect the composition of the water in the final part of the pathway with more influence of seawater. Porewater springs were sampled in February 2019 during low tide in three different types of locations in the tidal flat area: nearshore where the springs are located close to the vegetated shoreline (salt marsh), offshore approximately 70 meters from the vegetation and in the middle from both locations. In addition, porewater from a nearby sandy beach (around 500 meters away from the area of spring sampling), and surface samples from a nearby lake and seawater, were obtained. Salinity and FDOM were measured in situ, and DOC and TDN in the laboratory.  The preliminary data showed low average values for salinity in all springs (0.2-1.4), as well as in beach porewater, indicating strong influence of fresh groundwater in the whole area. When comparing the three spring location types, the lowest salinities were found offshore, and the highest nearshore. This difference could be due to the size of the springs, since nearshore springs usually were smaller when compared to offshore springs. Furthermore, depressions in the tidal flat relief close to nearshore springs favored seawater retention in pools during low tide. Additionally, we found higher average values for DOC and FDOM in the nearshore when compared with the other spring areas, but lower compared to the lake, beach porewater and seawater. The average values for TDN (272-452 µmol L<sup>-1</sup>) in the groundwater springs were higher when compared to all other sample types (beach porewater, seawater, and lake water) in this study. These values suggest an anthropogenic input (e.g., agriculture influence) in the surrounding watershed and might stimulate primary productivity in the tidal flat. We conclude that groundwater springs in Sahlenburg tidal flat differ locally in their biogeochemistry due to different residence times, heterogeneity of sediment layers, and size of the springs.</p><p> </p>

scholarly journals Case study of temporal changes in maternal dietary intake and the association with breast milk mineral contents

2020 ◽  
Vol 89 ◽  
pp. 103468 ◽  
Author(s):  
Seok Shin Tan ◽  
Geok Lin Khor ◽  
Eline Stoutjesdijk ◽  
Kock Wai Tony Ng ◽  
Ilse Khouw ◽  
...  
Keyword(s):  
Breast Milk ◽  
Dietary Intake ◽  
Temporal Changes ◽  
Mineral Contents ◽  
Maternal Dietary Intake

Effect of subsurface dams on saltwater intrusion and fresh groundwater discharge

2019 ◽  
Vol 576 ◽  
pp. 508-519 ◽  
Author(s):  
Qinpeng Chang ◽  
Tianyuan Zheng ◽  
Xilai Zheng ◽  
Bo Zhang ◽  
Qiguo Sun ◽  
...  
Keyword(s):  
Saltwater Intrusion ◽  
Groundwater Discharge ◽  
Fresh Groundwater
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