Submarine Groundwater Discharge at a Mega‐Tidal Beach DOI Creative Commons

Raymond D. Craddock,

Aaron A. Mohammed, Joseph Tamborski

et al.

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(11)

Published: Nov. 1, 2024

ABSTRACT Tidally influenced groundwater systems in coastal environments represent important mixing zones of fresh and circulating seawater, manifesting as submarine discharge (SGD). Water circulation induced by tidal pumping enhances the exchange chemicals between aquifers waters thereby influences biogeochemistry zones. Here, we report results an SGD field study conducted at a steep, mega‐tidal sand gravel beach along Canadian coast Bay Fundy, region with world's highest tides (semi‐diurnal ranges exceeding 10 m). Several physical geochemical measurement techniques were employed to document spatiotemporal variability. was directly sampled from seepage meters installed over multiple cycles two summer campaigns. rates estimated tracer mass balances for radon (August 2020) radium isotopes (July 2021) cycles. averaged estimates ranged 12 87 cm d −1 , average 42 while tracing yielded tidally rate 86 . 23 43 shoreline 6 71 offshore, depending on residence times. Radionuclide analyses meter suggest that time seawater through aquifer is less than 1 day. measurements settings are rare, combination steep slopes, highly permeable sediments high range drive very diffusive SGD. Salinity gradients intertidal zone demonstrate primarily comprised circulated negligible groundwater. Although freshwater proportion relatively low, large volumetric total can still contribute amounts terrestrially derived remineralized nutrients waters.

Language: Английский

Saltwater Intrusion Into a Confined Island Aquifer Driven by Erosion, Changing Recharge, Sea‐Level Rise, and Coastal Flooding DOI Creative Commons

Steve Stanic,

Nicole K. LeRoux, Anner Paldor

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(1)

Published: Jan. 1, 2024

Abstract Aquifers on small islands are at risk of salinization due to low elevations and limited adaptive capacity, present risks will be exacerbated by climate change. Most studies addressing small‐island saltwater intrusion (SWI) have focused homogeneous sandy one or two hydraulic disturbances. We herein investigate SWI dynamics in a layered, confined island aquifer response multiple environmental perturbations related change, with considered tandem. Our field modeling work is based an that provides the drinking water supply for Indigenous community Atlantic Canada. Observation well data electrical resistivity profiles were used calibrate numerical model (HydroGeoSphere) coupled groundwater flow salt transport. The calibrated was simulate impacts change including sea‐level rise (SLR), storm surge overtopping, changing recharge, erosion. Simulated conditions resilient surges because confining layer prevented deeper leaching. However, reduced recharge erosion resulted wedge migration 170 110 m, respectively when individually, up 295 m (i.e., into wellfield) together. Despite conditions, SLR 55 as pressures not sufficient resist movement. This first study harness integrated, surface‐subsurface hydrologic assess effects coastal other hydroclimatic stressors aquifers, highlighting can drive extensive critical resources.

Language: Английский

Citations

9
Interrelated Coastal Flooding, Erosion, and Groundwater Salinization on a Barrier Island During Hurricane Fiona DOI Creative Commons
Julia A. Cantelon, Nicole K. LeRoux, Ryan P. Mulligan

et al.

Journal of Geophysical Research Earth Surface, Journal Year: 2024, Volume and Issue: 129(4)

Published: April 1, 2024

Abstract Coastal flooding transforms barrier island morphology and rapidly salinizes freshwater lenses that support populations ecosystems. Climate change is expected to increase coastal flood risks, understanding future vulnerability requires erosion salinization processes their feedbacks. This study investigates how groundwater salinity distributions on Hog Island, Prince Edward Canada, responded high water levels during post‐tropical storm Fiona (24 September 2022), the costliest hurricane make landfall in Canadian history. Island was monitored with drone‐based LiDAR, beach dynamics were investigated frequency‐domain electromagnetic geophysics surveys monitoring wells. Comparing pre‐storm post‐disturbance data revealed dune scarping thinned ocean‐side foredune by 12.3 m average reduced total volume 12%. Beach electrical conductivity increased up 2 19 mS cm −1 , respectively, lens lost under eroded foredune. Measurements 9 months after early‐stage recovery of foredune; however, prolonged recovery, only 1%. Without a stable foredune, landward extent recurring limited flushing aquifer recovery. Results indicate rapid from extreme storms shifts boundaries, formerly resources, limits These findings emphasize importance often‐overlooked interconnections between flooding, erosion, effectively manage resources an age environmental change.

Language: Английский

Citations

5
Impacts of groundwater dynamics around a macro-tidal river on agricultural soil salinity DOI Creative Commons
Hayden A. Tackley, Barret L. Kurylyk, Craig B. Lake

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 927, P. 172344 - 172344

Published: April 10, 2024

Estuaries are vulnerable to oceanic and atmospheric climate change. Much of the research investigating change impacts on estuaries is focused saltwater intrusion within surface water due drought rising sea levels, with implications for ecosystems humans. Groundwater soil near may also be influenced, as estuary salinity hydraulic head changes can impact soils aquifers not previously at risk salinization. This study was conducted address knowledge gaps related present future groundwater distribution in a system connected macro-tidal estuary. The studied experiences tidal bore its connection Bay Fundy Nova Scotia, Canada. A parcel agricultural land adjacent selected assess response episodic fluctuations levels salinity. monitoring electromagnetic surveys were map patterns. numerical model flow solute transport informed by field data used investigate how varying droughts sea-level rise could Results showed that, contrast salt wedges observed along marine coasts, saline existed plume immediately around Model simulations that short-term had an insignificant However, permanent increases caused increased volume 86 %, or additional ∼11 m horizontally ∼ 4.5 vertically. Our results suggest river this setting would result widespread salinization porewater soils, but more extensive experienced permeable estuarine zones. Findings inform management decisions regions exposed future.

Language: Английский

Citations

5
Tidal signal propagation in coastal aquifers considering semi-permeable boundaries and partial penetration effects DOI
Fu-Kuo Huang, Ying‐Fan Lin,

Grace S. Wang

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132657 - 132657

Published: Jan. 1, 2025

Language: Английский

Citations

0
Saline sediment deposition in estuarine floodplains exacerbates vertical saltwater intrusion DOI Creative Commons
Hayden A. Tackley, Craig B. Lake, Danika van Proosdij

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133116 - 133116

Published: March 1, 2025

Language: Английский

Citations

0
Decision-making and ecosystem service dimensions of managed dyke realignment in the complex coastal landscapes of the Bay of Fundy DOI Creative Commons
Lara Cornejo-Denman, Elson Ian Nyl Ebreo Galang, Kate Sherren

et al.

Ocean & Coastal Management, Journal Year: 2025, Volume and Issue: 266, P. 107683 - 107683

Published: April 14, 2025

Language: Английский

Citations

0
Modeling the water use associated with energy consumption changes on saltwater intrusion in the Pearl River estuary, China DOI
Yilin Chen,

Zhihao Xu,

Dong Qian

et al.

Applied Energy, Journal Year: 2024, Volume and Issue: 372, P. 123755 - 123755

Published: June 25, 2024

Language: Английский

Citations

1
A novel subsurface adjustable dam for preventing active seawater intrusion in coastal aquifers DOI Creative Commons

Qinpeng Chang,

Chenchen Gao,

Xilai Zheng

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: July 11, 2024

Subsurface physical barriers are widely used to prevent seawater intrusion in the world. After construction of barriers, residual saltwater is trapped upstream barriers. Traditional including cutoff walls and subsurface dams, fixed structure fail prohibiting active intrusion. In this work, a novel adjustable dam, composed dam bodies sluice gates, was designed store groundwater flexibly according seasonal variations precipitation. We set three-dimensional field-scale numerical simulations compare control effects walls, dams. The results revealed that traditional could mitigate velocity but were inadequate completely preventing process. Furthermore, although temporarily alleviate during wet periods, wedge would subsequently invade next dry periods. Thus, salt mass aquifer scenarios exhibited gradual annual increase. contrast, demonstrated ability remove saltwater. During characterized by low precipitation recharge, gates closed obstruct path Conversely, periods with abundant precipitation, opened, facilitating removal flexible adjustment mechanism dams resulted decrease both length entire aquifer. These findings underscore efficacy as measure for simultaneously eliminating

Language: Английский

Citations

1
Physical and chemical characterization of remote coastal aquifers and submarine groundwater discharge from a glacierized watershed DOI Creative Commons
Aeon Russo, Jordan Jenckes, David F. Boutt

et al.

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(7)

Published: July 1, 2024

Abstract Coastal aquifers play an important role in marine ecosystems by providing high fluxes of nutrients and solutes via submarine groundwater discharge pathways. The physical chemical characterization these dynamic systems is foundational to understanding the extent magnitude hydrogeologic processes their subsequent contributions environment. We describe a km‐scale experimental field site located glaciofluvial delta entering Kachemak Bay, Alaska. Our applies geophysical (ERT HVSR), (grain size analyses, slug tests tidal response analyses) geochemical (major ions stable water isotopes) methods complexity coastal proglacial environments currently experiencing rapid transformations. techniques revealed thick (20–84 m) sediments dominated sands gravels delineated zones freshwater, brackish saltwater at both low tides within subterranean estuary. Estimates hydraulic conductivities multiple approaches ranged from 2 250 m d −1 , with means across four same order magnitude. Tidal analyses highlighted aquifer strong connection sea as evidenced clear spring‐ neap‐tidal signals proximal piezometric hydrograph. Geochemical sampling groundwaters substantially enriched compared river samples limited variability seasons. A between Wosnesenski River adjacent was also observed, concentrated recharge corridor during meltwater season. This combination provides basis for conceptual model Gulf Alaska upscaled mean daily yield freshwater subsurface. findings are critical numerical simulations flow, pumping reactions transport understudied environments. approach may be applied low‐cost, large‐scale investigations areas particularly useful remote sites where access mobility challenging.

Language: Английский

Citations

1
Reimagining nature‐based coastal adaptation: A nested framework DOI Creative Commons
Kate Sherren, H. M. Tuihedur Rahman,

Patricia Manuel

et al.

Journal of Flood Risk Management, Journal Year: 2024, Volume and Issue: 17(4)

Published: July 29, 2024

Abstract Nature‐based coastal adaptation is a subset of nature‐based solutions that has to this point focused on the materiality managing risks: what our protections are made or where we put things in way harm. In collaborative interdisciplinary work, have been reimagining start with first principles: how think about coast and makes good life. approach shared sense possible, also known as social imaginary, needs shifting before any physical material. This paper presents new nested framework for thinking using five words starting R: Reimagine, Reserve, Relocate, Restore, Reinforce. We use option managed dyke realignment Bay Fundy agricultural dykelands illustrate utility practice but assert its more generic applicability.

Language: Английский

Citations

1