Evaluation of Temperature Profiling and Seepage Meter Methods for Quantifying Submarine Groundwater Discharge to Coastal Lagoons: Impacts of Saltwater Intrusion and the Associated Thermal Regime

Tirado-Conde, Joel; Engesgaard, Peter; Karan, Sachin; Müller, Sascha; Duque, Carlos

doi:10.3390/w11081648

Cited by 26 publications

(17 citation statements)

References 37 publications

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“…The majority of the contributions [3,5,[8][9][10][11][15][16][17][19][20][21][22][23] focus on the interactions between rivers or streams and groundwater. Three studies [6,13,14] investigate the interactions between lakes and groundwater, while two studies [4,18] deal with the exchange between groundwater and oceanic water. Two additional contributions [7,12] show the relevance of groundwater exchange processes in wetlands.…”

Section: Overview Of the Special Issue Contributionsmentioning

confidence: 99%

“…Despite SGD having been studied much more intensively than LGD, there are still many knowledge gaps that need to be addressed, and there is still a need to develop appropriate measurement methods for SGD. Tirado-Conde et al [18] compare the results of traditional seepage meter measurements with several analytical approaches of vertical sediment temperature profiles in a lagoon in Denmark. Duque et al [4] applied stable isotopes of water to delineate flow paths and the origin of water in a coastal aquifer.…”

Section: Groundwater-ocean Interactionsmentioning

confidence: 99%

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Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Lewandowski

Meinikmann

Krause

2020

Water

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The interactions of groundwater with surface waters such as streams, lakes, wetlands, or oceans are relevant for a wide range of reasons—for example, drinking water resources may rely on hydrologic fluxes between groundwater and surface water. However, nutrients and pollutants can also be transported across the interface and experience transformation, enrichment, or retention along the flow paths and cause impacts on the interconnected receptor systems. To maintain drinking water resources and ecosystem health, a mechanistic understanding of the underlying processes controlling the spatial patterns and temporal dynamics of groundwater–surface water interactions is crucial. This Special Issue provides an overview of current research advances and innovative approaches in the broad field of groundwater–surface water interactions. The 20 research articles and 1 communication of this Special Issue cover a wide range of thematic scopes, scales, and experimental and modelling methods across different disciplines (hydrology, aquatic ecology, biogeochemistry, environmental pollution) collaborating in research on groundwater–surface water interactions. The collection of research papers in this Special Issue also allows the identification of current knowledge gaps and reveals the challenges in establishing standardized measurement, observation, and assessment approaches. With regards to its relevance for environmental and water management and protection, the impact of groundwater–surface water interactions is still not fully understood and is often underestimated, which is not only due to a lack of awareness but also a lack of knowledge and experience regarding appropriate measurement and analysis approaches. This lack of knowledge exchange from research into management practice suggests that more efforts are needed to disseminate scientific results and methods to practitioners and policy makers.

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Section: Overview Of the Special Issue Contributionsmentioning

confidence: 99%

Section: Groundwater-ocean Interactionsmentioning

confidence: 99%

Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Lewandowski

Meinikmann

Krause

2020

Water

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“…However, the groundwater flow with the associated nutrient input to the lagoon has not been researched. Previous groundwater-related research focused exclusively on the physical processes that determine the flow of groundwater to the lagoon [22,37], and the development of methodologies to help quantify water fluxes [38,45].…”

Section: Study Areamentioning

confidence: 99%

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Duque

Jessen

Tirado-Conde

et al. 2019

Water

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Submarine groundwater discharge (SGD)—including terrestrial freshwater, density-driven flow at the saltwater–freshwater interface, and benthic exchange—can deliver nutrients to coastal areas, generating a negative effect in the quality of marine water bodies. It is recognized that water stable isotopes (18O and 2H) can be helpful tracers to identify different flow paths and origins of water. Here, we show that they can be also applied when assessing sources of nutrients to coastal areas. A field site near a lagoon (Ringkøbing Fjord, Denmark) has been monitored at a metric scale to test if stable isotopes of water can be used to achieve a better understanding of the hydrochemical processes taking place in coastal aquifers, where there is a transition from freshwater to saltwater. Results show that 18O and 2H differentiate the coastal aquifer into three zones: Freshwater, shallow, and deep saline zones, which corresponded well with zones having distinct concentrations of inorganic phosphorous. The explanation is associated with three mechanisms: (1) Differences in sediment composition, (2) chemical reactions triggered by mixing of different type of fluxes, and (3) biochemical and diffusive processes in the lagoon bed. The different behaviors of nutrients in Ringkøbing Fjord need to be considered in water quality management. PO4 underneath the lagoon exceeds the groundwater concentration inland, thus demonstrating an intra-lagoon origin, while NO3, higher inland due to anthropogenic activity, is denitrified in the study area before reaching the lagoon.

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“…Steady-state, T-z methods have been utilized in a wide range of applications, including aquifer-scale estimates of vertical groundwater flow (Bense & Kooi, 2004;Cartwright, 1970;Ferguson, Woodbury, & Matile, 2003;Kurylyk et al, 2017) and submarine groundwater discharge Tirado-Conde, Engesgaard, Karan, Muller, & Duque, 2019). However, T-z methods are most widely used to estimate groundwater discharge to inland surface water bodies (e.g., Anibas et al, 2009;Anibas, Buis, Verhoeven, Meire, & Batelaan, 2011;Caissie et al, 2014;Kurylyk et al, 2017;Schmidt et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Quantitative guidance for efficient vertical flow measurements at the sediment–water interface using temperature–depth profiles

Irvine

Kurylyk

Briggs

2019

Hydrological Processes

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Upward discharge to surface water bodies can be quantified using analytical models based on temperature-depth (T-z) profiles. The use of sediment T-z profiles is attractive as discharge estimates can be obtained using point-in-time data that are collected inexpensively and rapidly. Previous studies have identified that T-z methods can only be applied at times of the year when there is significant difference between the streambed-water interface and deeper sediment temperatures (e.g., winter and summer). However, surface water temperatures also vary diurnally, and the influence of these variations on discharge estimates from T-z methods is poorly understood.For this study, synthetic T-z profiles were generated numerically using measured streambed interface temperature data to assess the influence of diurnal temperature variations on discharge estimation and provide insight into the suitable application of T-z methods. Results show that the time of day of data collection can have a substantial influence on vertical flux estimates using T-z methods. For low groundwater discharge fluxes (e.g., 0.1 m d −1 ), daily transience in streambed temperatures led to relatively large errors in estimated flow magnitude and direction. For higher discharge fluxes (1.5 m d −1 ), the influence of transient streambed temperatures on discharge estimates was strongly reduced. Discharge estimates from point-in-time T-z profiles were most accurate when the uppermost point in the T-z profile was near the bed interface daily mean (two time periods daily). Where temperature time series data are available, daily averaged T-z profiles can produce accurate discharge estimates across a wide range of discharge rates. Seasonality in shallow groundwater temperature generally had a negligible influence on vertical flow estimates. These findings can be used to plan field campaigns and provide guidance on the optimal applicationof T-z methods to quantify vertical groundwater discharge to surface water bodies. K E Y W O R D Sanalytical solutions, gaining stream, groundwater discharge, groundwater, surface water exchange, heat as a groundwater tracer, hyporheic flow, river-aquifer interactions, streambed mapping

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Evaluation of Temperature Profiling and Seepage Meter Methods for Quantifying Submarine Groundwater Discharge to Coastal Lagoons: Impacts of Saltwater Intrusion and the Associated Thermal Regime

Cited by 26 publications

References 37 publications

Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Application of Stable Isotopes of Water to Study Coupled Submarine Groundwater Discharge and Nutrient Delivery

Quantitative guidance for efficient vertical flow measurements at the sediment–water interface using temperature–depth profiles

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