scholarly journals Evaluation of the groundwater discharge and the spatial distribution of radium isotope in Quanwan Bay of Lake Qinghai

2019 ◽  
Vol 31 (6) ◽  
pp. 1749-1757
Author(s):  
SU Weigang ◽  
◽  
SHA Zhanjiang ◽  
KONG Fancui ◽  
WANG Qiugui ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Groundwater Discharge ◽  
Lake Qinghai ◽  
Radium Isotope

Detecting Submarine Groundwater Plumes in the Salalah Area: a Radon Tracer and Numerical Integral Plume Model Approach

2019 ◽  
Author(s):  
◽  
Hajar Al Balushi
Keyword(s):  
Spatial Distribution ◽  
Submarine Groundwater Discharge ◽  
Arid Regions ◽  
Meteoric Water ◽  
Groundwater Discharge ◽  
Sultanate Of Oman ◽  
Exploration And Exploitation ◽  
Submarine Groundwater ◽  
Hydraulic Gradients ◽  
Model Approach

The inflow of fresh or brackish groundwater into the sea is referred to as Submarine Groundwater Discharge (SGD). The SGD is enforced by a terrestrial component whichmainly depends on freshwater extraction and recharge by meteoric water and on aquifer permeability. And a marine component that is mainly controlled by the spatial distribution of outflows and water depth (hydraulic gradients between land and sea). This study is motivated by the importance of freshwater in arid regions and, in particular, by the continuous challenges posed by the exploration and exploitation of fresh water sources inthe Sultanate of Oman. Moreover, there is a lack of studies on SGD phenomena alongthe 1000 km coastline in the South of Oman. The objective of this study is to develop a method to detect SGD spots in the offshore region, autonomously, and understanding thehydrodynamics of the discharge seepage for future backtracking, quantification and coastaland groundwater management. The study area Salalah, Dhofar Governorate, South of Oman is known to have a high natural groundwater recharge during the monsoon seasonand a karstic coastal seafloor, which results in a high potential of submarine groundwater discharge spots.

Evaluation of submarine groundwater discharge into the northern Bohai Bay, China using 226Ra

2015 ◽  
Vol 16 (2) ◽  
pp. 362-368 ◽  
Author(s):  
Xuejing Wang ◽  
Hailong Li ◽  
Yan Zhang ◽  
Chaoyue Wang ◽  
Wenjing Qu ◽  
...  
Keyword(s):  
Mass Balance ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Balance Model ◽  
Return Flow ◽  
Bohai Bay ◽  
Mass Balance Model ◽  
Material Transport ◽  
Radium Isotope ◽  
Submarine Groundwater

Submarine groundwater discharge (SGD) has been widely recognized as a significant source of water and dissolved material transport from land to ocean. To quantify SGD into the northern Bohai Bay, China, naturally occurring radium isotope (226Ra) was measured in water samples collected along two transects in September 2012. Based on a tidal prism model, two different flushing times of the coastal water were determined to be 9.1 d and 11.5 d with respect to the different return flow factor (b) obtained from a physical model and a mass balance model of 226Ra and salinity, respectively. Using the derived flushing time, we developed a 226Ra mass balance model to estimate the SGD into the bay, which includes mixing, sedimentary input and SGD. The 226Ra budget indicated the 226Ra input from SGD accounted for 99% of the total tracer input to the northern Bohai Bay. We arrived at an average flux from SGD of 4.83 × 107 m3/d. The large volume of SGD confirms its importance in supplying a considerable quantity of nutrients to the bay.

scholarly journals Evaluations of spatial distribution of submarine groundwater discharge

2006 ◽  
Vol 33 (6) ◽  
Author(s):  
Makoto Taniguchi ◽  
Tomotoshi Ishitobi ◽  
Jun Shimada ◽  
Naohiko Takamoto
Keyword(s):  
Spatial Distribution ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Submarine Groundwater

scholarly journals Spatial distribution and budget for submarine groundwater discharge in Eckernförde Bay (Western Baltic Sea)

2004 ◽  
Vol 49 (1) ◽  
pp. 157-167 ◽  
Author(s):  
Michael Schlüter ◽  
Eberhard J. Sauter ◽  
Claus E. Andersen ◽  
Henning Dahlgaard ◽  
Paul R. Dando
Keyword(s):  
Spatial Distribution ◽  
Baltic Sea ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Submarine Groundwater

scholarly journals Combining passive- and active-DTS measurements to locate and quantify groundwater discharge into streams

2021 ◽  
Author(s):  
Nataline Simon ◽  
Olivier Bour ◽  
Mikaël Faucheux ◽  
Nicolas Lavenant ◽  
Hugo Le Lay ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Hydrological Cycle ◽  
Stream Water ◽  
Groundwater Discharge ◽  
Agricultural Watershed ◽  
Distributed Temperature Sensing ◽  
Groundwater Flux ◽  
Set Up ◽  
Streambed Sediments ◽  
The Impact

Abstract. FO-DTS (Fiber Optic Distributed Temperature Sensing) technology has been widely developed to quantify exchanges between groundwater and surface water during the last decade. In this study, we propose, for the first time, to combine long-term passive-DTS measurements and active-DTS measurements in order to highlight their respective potential to locate and quantify groundwater discharge into streams. On the one hand, passive-DTS measurements consist in monitoring natural temperature fluctuations to detect and localize groundwater inflows and characterize the temporal pattern of exchanges. Although easy to set up, the quantification of fluxes with this approach often remains difficult since it relies on energy balance models or on the coupling of distributed temperature measurements with additional punctual measurements. On the other hand, active-DTS methods, recently developed in hydrogeology, consist in continuously monitoring temperature changes induced by a heat source along a FO cable. Recent developments showed that this approach, although more complex to set up than passive-DTS measurements, can address the challenge of quantifying groundwater fluxes and their spatial distribution. Yet it has almost never been conducted in streambed sediments. In this study, both methods are combined by deploying FO cables in the streambed sediments of a first- and second-order stream within a small agricultural watershed. A numerical model is used to interpret passive-DTS measurements and highlight the temporal and spatial dynamic of groundwater discharge over the annual hydrological cycle. We underline the difficulties and the limitations of deploying a single FO cable to investigate groundwater discharge and show the impact of uncertainty on sediments thermal properties on the quantification of groundwater inflows. On the opposite, the active-DTS experiment allows estimating the spatial distribution of both the thermal conductivity and the groundwater flux at high resolution with very low uncertainties all along the heated section of FO cable. Our results highlight the added values of conducting active-DTS experiments, eventually combined with passive-DTS measurements, to fully investigate and characterize patterns of groundwater-stream water exchanges at the stream scale. The combination of both methods allows discussing the impact of topography and hydraulic conductivity variations on the variability of groundwater inflows in headwater catchments.

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