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Journal articles on the topic 'Swash groundwater'

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Author: Grafiati
Published: 4 May 2024

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1

Delisle, Marie-Pierre, Yeulwoo Kim, and Timu Gallien. "BEACH GROUNDWATER IMPACTS ON WAVE OVERTOPPING FLOODING." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 91. http://dx.doi.org/10.9753/icce.v37.management.91.

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Coastal flooding is a growing socioeconomic and humanitarian hazard (e.g., Nicholls, 2010). Increased beach groundwater levels may inundate low-lying areas and simultaneously propagate swash impacts onto higher beach and backshore elevations. Generally, coastal flood modeling and risk assessment characterize only surface flows, neglecting beach groundwater and swash zone processes such as infiltration and porous media flow. Numerous studies have considered the effects of swash on groundwater (e.g., Gourlay, 1992). Infiltration leads to reduced wave runup (Pintado-Patino et al., 2015) and is promoted by low beach groundwater levels (Bakhtyar et al., 2011), suggesting that beach groundwater plays a critical role in infiltration/exfiltration processes. Notably, the impacts of beach groundwater on swash flows and subsequent consequences on coastal flooding have not been explored. Coastal flooding from wave overtopping is expected to occur around the maximum tide. However, recent field observations suggest maximum overtopping lags behind high tide and is in phase with maximum groundwater levels. In this study, a turbulence and depth resolving numerical model is developed to examine the interaction between beach groundwater and wave overtopping processes.
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2

Austin, Martin J., and Gerhard Masselink. "Swash–groundwater interaction on a steep gravel beach." Continental Shelf Research 26, no. 20 (December 2006): 2503–19. http://dx.doi.org/10.1016/j.csr.2006.07.031.

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3

Sous, Damien, Adrien Lambert, Vincent Rey, and Herve Michallet. "Swash–groundwater dynamics in a sandy beach laboratory experiment." Coastal Engineering 80 (October 2013): 122–36. http://dx.doi.org/10.1016/j.coastaleng.2013.05.006.

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4

Maple, Margit, Maia Coylar, Russell Detwiler, and Timu Gallien. "MODELING COASTAL WATER TABLE FLUCTUATIONS USING PFLOTRAN." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 88. http://dx.doi.org/10.9753/icce.v37.management.88.

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Coastal aquifers are highly dynamic groundwater systems. Sea level rise will cause a rise in coastal groundwater tables resulting in increased risk of shallow or emergent groundwater (Befus et al., 2020). Marine water level fluctuations cause the beach groundwater table to oscillate over a relatively large range. Understanding these oscillations is crucial, as shallow (i.e., high) water tables may impact subsurface infrastructure, mobilize sediment, and increase liquefaction risks. Although the impacts of tides and wave setup on coastal water tables have been studied (e.g., Nielsen, 1990; Housego et al, 2021), the cumulative impacts of wave runup, partially saturated flow, complex beach topography, and dual tidal forcing for bay-backed regions have not been explored. This work numerically models beach water table fluctuations which are compared to in-situ swash and beach groundwater observations at Cardiff State Beach in Encinitas, CA.
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5

MIYATAKE, Makoto, Sakura ISHIBASHI, Katsutoshi KIMURA, Masashi OCHI, Shinji SASSA, and Hajime SHIROZU. "PREDICTION OF SEDIMENT TRANSPORT IN SWASH ZONE CONSIDERING SATURATED-UNSATURATED GROUNDWATER FLOW." Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74, no. 2 (2018): I_715—I_720. http://dx.doi.org/10.2208/kaigan.74.i_715.

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6

Li, L., D. A. Barry, C. B. Pattiaratchi, and G. Masselink. "BeachWin: modelling groundwater effects on swash sediment transport and beach profile changes." Environmental Modelling & Software 17, no. 3 (January 2002): 313–20. http://dx.doi.org/10.1016/s1364-8152(01)00066-4.

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7

Sous, Damien, Lise Petitjean, Frédéric Bouchette, Vincent Rey, Samuel Meulé, Francois Sabatier, and Kévin Martins. "Field evidence of swash groundwater circulation in the microtidal rousty beach, France." Advances in Water Resources 97 (November 2016): 144–55. http://dx.doi.org/10.1016/j.advwatres.2016.09.009.

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8

Horn, Diane P. "Measurements and modelling of beach groundwater flow in the swash-zone: a review." Continental Shelf Research 26, no. 5 (April 2006): 622–52. http://dx.doi.org/10.1016/j.csr.2006.02.001.

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9

Turner, Ian L. "Monitoring groundwater dynamics in the littoral zone at seasonal, storm, tide and swash frequencies." Coastal Engineering 35, no. 1-2 (October 1998): 1–16. http://dx.doi.org/10.1016/s0378-3839(98)00023-4.

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10

Othman, Norasman, Ahmad Khairi Abd Wahab, and Mohamad Hidayat Jamal. "EFFECTS OF SEASONAL VARIATIONS ON SANDY BEACH GROUNDWATER TABLE AND SWASH ZONE SEDIMENT TRANSPORT." Coastal Engineering Proceedings 1, no. 34 (October 30, 2014): 59. http://dx.doi.org/10.9753/icce.v34.sediment.59.

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11

Ruiz de Alegria-Arzaburu, Amaia, Jon J. Williams, and Gerhard Masselink. "APPLICATION OF XBEACH TO MODEL STORM RESPONSE ON A MACROTIDAL GRAVEL BARRIER." Coastal Engineering Proceedings 1, no. 32 (January 23, 2011): 39. http://dx.doi.org/10.9753/icce.v32.sediment.39.

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The process-based XBeach numerical model has been used to simulate storm-induced morphological response on a macrotidal gravel barrier located in southwest UK. Using well-established parameterisation to define all relevant hydrodynamic, groundwater and sediment processes, the model was applied in 1D mode to simulate observed storm-induced beach profile responses. Investigations showed that the morphological response of the beach was best modelled using a total drag coefficient, CD, of 0.007, and a hydraulic conductivity, K, of 0.05ms-1. Results obtained from simulations with and without beach groundwater highlighted the need to account for groundwater effects when modelling morphological changes on gravel beaches. The model has been found unable of reproducing the formation of a berm, thus, beach recovery conditions cannot be modelled. This is mainly attributed to the fact that XBeach models long waves rather than individual waves, and thus it cannot simulate individual swash events that contribute to onshore sediment transport and berm accretion. However, the model is shown to provide good estimates of post-storm gravel beach/barrier profiles, and to define the threshold for overwash occurrence. Both attributes have utility in a range of practical coastal engineering and management applications.
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12

Fischione, Piera, Davide Pasquali, Daniele Celli, Carmine Di Nucci, and Marcello Di Risio. "Beach Drainage System: A Comprehensive Review of a Controversial Soft-Engineering Method." Journal of Marine Science and Engineering 10, no. 2 (January 22, 2022): 145. http://dx.doi.org/10.3390/jmse10020145.

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The beach drainage can be included among the soft engineering methods aimed to counteract the shoreline retreat related to the sediment redistribution along the beach profile. The idea that the groundwater table plays a role in the mobilization of the sediment grains underlies the application of the beach drainage system (BDS) as a tool able to modify the natural dynamics of groundwater table at sandy beaches. Indeed, BDS consists of a series of alongshore buried drains aimed to lower the groundwater table. Due to the drainage, the thickening of the layer of dry sand makes the solid grains less prone to be mobilized by the action of the waves at the swash zone, where interaction phenomena between the percolating and the incoming water lens take place. This tool had a troubled history. Its first applications were encouraging. Since then, controversial performances of both experimental and prototype scale experiences have been observed around the world. This paper aims to present an up-to-date full review of the studies and experiments carried out so far, in order to provide the reader with a complete perspective on its strength and weakness as well as open challenges to be faced in the near future.
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13

Turner, Ian L. "Simulating the influence of groundwater seepage on sediment transported by the sweep of the swash zone across macro-tidal beaches." Marine Geology 125, no. 1-2 (June 1995): 153–74. http://dx.doi.org/10.1016/0025-3227(95)00026-u.

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14

Rakos, Jason, Karen Gonzalez, Vivian Flaum, Dustyn Weber, and Cory Rusinek. "Detection of Pertechnetate Using Square Wave Anodic Stripping Voltammetry on Carbon Electrodes." ECS Meeting Abstracts MA2022-02, no. 58 (October 9, 2022): 2195. http://dx.doi.org/10.1149/ma2022-02582195mtgabs.

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Technetium-99 (Tc-99) is a primary fission product of U-235, U-233, and Pu-239 and is a major constituent of radioactive waste. Tc-99 is commonly found as pertechnetate (TcO4 -), an anion that does not readily adsorb to natural sediment and is extremely mobile in environmental water systems. With concerns that radioactive waste may be leaking from sub-surface storage tanks and potentially reaching groundwater, developing detection methods for TcO4 - is important. Square wave anodic stripping voltammetry (SWASV) is a simple electrochemical technique that has yet to be investigated for pertechnetate due to the high potential required to form solid TcO2. In this work, we use SWASV with a variety of carbon electrodes to determine the optimal conditions for the detection of TcO4 - in a variety of solutions including acidic, basic and neutral pH. Carbon electrodes such as glassy carbon, boron-doped diamond, and nitrogen-doped tetrahedral amorphous carbon were examined. Carbon electrodes are ideal for the detection of pertechnetate due to their robust nature, low background current, and wide windows when compared to metal electrodes. Control studies included optimization of the deposition potential and time. In addition, calibration curves were created for each solution’s optimized parameters. Several analytical figures of merit such as the sensitivity, limit of detection, and limit of quantification were determined. This work expands upon the use of carbon electrodes for trace detection of environmentally relevant analytes.
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15

Keevil, Claire E., Mike Rogerson, Daniel R. Parsons, Ramon Mercedes-Martín, Alexander T. Brasier, John J. G. Reijmer, and Anna Matthews. "The geomorphological distribution of subaqueous tufa columns in a hypersaline lake: Mono Lake, U.S.A." Journal of Sedimentary Research 92, no. 6 (June 21, 2022): 530–45. http://dx.doi.org/10.2110/jsr.2021.034.

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Abstract Understanding the flow of carbon through hyperalkaline lakes is a key means of understanding their biogeochemistry, sedimentology, and their paleoenvironmental and paleoclimatic records. Furthermore, understanding how mineral precipitation is regulated in these lakes can provide insights into how their sequestration of carbon can be managed. We report geophysical surveys of Mono Lake, California, USA, which show unanticipated geomorphological control on the recent/contemporary formation of lacustrine carbonate formations (“tufa”). Acquired shallow-penetration seismic data show a fault zone below the lake floor, but despite the regional evidence for geothermal waters rising up these fractures, we find no evidence for tufa precipitation at the surface exposure of this structure, either in the seismic data or in the swath bathymetry. However, we do find sub-lacustrine tufa columns in these data elsewhere, which is the first time these have been reported directly. We find and report on a strong link between column location and meteoric Ca supply to the lake, with the latter sourced either through surface runoff or groundwater. For example, a region close to a creek inlet has more frequent and larger tufa bodies, which grow at a wider depth range than another region far from an inlet but close to the fault. This demonstrates the importance of meteoric water ingress in regulating carbonate mineral formation in these basins, and raises the possibility that management of water within the catchment could be a means to enhance carbon capture in natural and artificial hyperalkaline lakes.
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16

Zhang, Yonghong, Hongan Wu, Mingju Li, Yonghui Kang, and Zhong Lu. "Investigating Ground Subsidence and the Causes over the Whole Jiangsu Province, China Using Sentinel-1 SAR Data." Remote Sensing 13, no. 2 (January 7, 2021): 179. http://dx.doi.org/10.3390/rs13020179.

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Interferometric synthetic aperture radar (InSAR) mapping of localized ground surface deformation has become an important tool to manage subsidence-related geohazards. However, monitoring land surface deformation using InSAR at high spatial resolution over a large region is still a formidable task. In this paper, we report a research on investigating ground subsidence and the causes over the entire 107, 200 km2 province of Jiangsu, China, using time-series InSAR. The Sentinel-1 Interferometric Wide-swath (IW) images of 6 frames are used to map ground subsidence over the whole province for the period 2016–2018. We present processing methodology in detail, with emphasis on the three-level co-registration scheme of S-1 data, retrieval of mean subsidence velocity (MSV) and subsidence time series, and mosaicking of multiple frames of results. The MSV and subsidence time series are generated for 9,276,214 selected coherent pixels (CPs) over the Jiangsu territory. Using 688 leveling measurements in evaluation, the derived MSV map of Jiangsu province shows an accuracy of 3.9 mm/year. Moreover, subsidence causes of the province are analyzed based on InSAR-derived subsidence characteristics, historical optical images, and field-work findings. Main factors accounting for the observed subsidence include: underground mining, groundwater withdrawal, soil consolidations of marine reclamation, and land-use transition from agricultural (paddy) to industrial land. This research demonstrates not only the capability of S-1 data in mapping ground deformation over wide areas in coastal and heavily vegetated region of China, but also the potential of inferring valuable knowledge from InSAR-derived results.
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17

Delisle, Marie‐Pierre C., Timu W. Gallien, and Yeulwoo Kim. "A numerical study of dam‐break driven swash and beach groundwater interactions." Journal of Geophysical Research: Oceans, August 21, 2023. http://dx.doi.org/10.1029/2022jc019615.

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AbstractThe dynamic interaction between swash and beach groundwater is fundamental to understanding wave runup and sediment transport processes. A numerical model that simultaneously resolves free surface and porous media flow for a variably saturated subsurface is presented. The novel numerical model, SedOlaFlow, is developed by merging the existing two‐phase, Eulerian sediment transport model, SedWaveFoam, with the surface wave solver, olaFlow. SedOlaFlow is validated with large wave flume surface and subsurface data for dam‐break driven swash over permeable gravel and sand beaches. Sediment size significantly impacts the swash‐groundwater relationship through infiltration/exfiltration and subsurface processes which modulate runup. Model results demonstrate that vertical infiltration into the upper unsaturated beach leads to a delayed groundwater table response to swash in the sand beach. Pressure fluctuations in the sand beach are not directly indicative of the swash depth or groundwater table and exfiltration may occur even when the swash depth is non‐zero. Groundwater circulation induced by a single swash event is non‐uniform and highly dynamic in the variably saturated vadose zone. Elevated ambient groundwater levels generally increase swash extent and duration. These findings establish the existence of a bi‐directional relationship between swash and groundwater flows and have significant implications on the effects of sea level rise on coastal flooding.
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18

Geng, Xiaolong, James W. Heiss, Holly A. Michael, Michel C. Boufadel, and Kenneth Lee. "Groundwater Flow and Moisture Dynamics in the Swash Zone: Effects of Heterogeneous Hydraulic Conductivity and Capillarity." Water Resources Research 56, no. 11 (November 2020). http://dx.doi.org/10.1029/2020wr028401.

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19

Tajima, Satoshi, Jiaqi Liu, and Tomochika Tokunaga. "Mechanisms of non‐fresh groundwater presence at water tables in highly permeable coastal aquifers." Groundwater, December 22, 2023. http://dx.doi.org/10.1111/gwat.13383.

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AbstractCoastal aquifers with high hydraulic conductivities on the order of 10‐2 m s‐1 have unconventional salinity distributions with the presence of non‐fresh groundwater at the water table over a wide swath near the coast. This study aims to unravel the mechanisms underlying the phenomenon via numerical simulations for variably saturated, density‐driven flow and solute transport in porous media. The simulation results indicate that the existence of non‐fresh groundwater at the water table is attributed to the upward mass flux in the saturated zone near the coast, which transports solute from deeper groundwater toward the water table. With high hydraulic conductivity, the upward mass flux becomes prominent at shallower elevations because of the high Darcy flux and the shallow saline groundwater. The upward mass flux has two main drivers, upward advection by the upward flow component and transverse dispersion by the seaward flow component. The advective mass flux dominates over the transverse dispersion in the deep part of the saturated zone where only groundwater with seawater salinity exists. In contrast, the transverse dispersion becomes more pronounced than the upward advection in the shallow saturated zone just beneath the water table and in the unsaturated zone immediately above the water table. Our findings help interpret the unconventional salinity distributions observed and elucidate the unique dynamics of groundwater flow and solute transport in highly permeable coastal aquifers.This article is protected by copyright. All rights reserved.
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20

Baskakov, A. I., A. A. Komarov, M. S. Mikhailov, N. D. Luchkovsky, and B. Odsuren. "UAV-BASED TWO-POSITION GROUND PENETRATING RADAR FOR OPERATIONAL MONITORING OF SUBSURFACE WATER RESOURCES." Journal of Radio Electronics 2023, no. 7 (July 2023). http://dx.doi.org/10.30898/1684-1719.2023.7.7.

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This paper considers the implementation of a two-position ground penetrating radar (GPR) located on board unmanned aerial vehicles (UAVs) and designed for the operational search for groundwater in arid and desert regions of Mongolia, which is an extremely urgent task. With the help of synthesizing the GPR antenna aperture on the UAV, a significant increase in information content is achieved compared to existing GPRs, since it becomes possible to obtain a panoramic radar image of the subsurface layers of the probed medium with the required resolution with a sufficiently wide swath. On the other hand, the necessary efficiency (required, for example, when monitoring vast desert areas) can only be achieved with a sufficiently wide field of view created on the basis of the two-position sounding principle, where the emitting and receiving signals are formed and processed on UAVs of different or equal heights flying with the same speed and spaced orthogonally to the direction of their movement, which makes it possible to use quasi-mirror reflection. In this case, the swath will be noticeably larger than in the case of nadir sounding. In a condensed form, the article considers the following issues: the model of a subsurface aquifer, the geometry of a two-position GPR in the quasi-mirror sounding mode, up to the features of synthesizing the aperture (Doppler narrowing of the radiation pattern) of the receiving antenna, resolution, the required potential of a two-position GPR for reliable detection of an aquifer subsurface horizon, accuracy measurements of its depth, as well as the need for experimental work to test the theoretical provisions.
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21

Cojean, Adeline N. Y., Katrina Kremer, Maciej Bartosiewicz, Stefano C. Fabbri, Moritz F. Lehmann, and Stefanie B. Wirth. "Morphology, Formation, and Activity of Three Different Pockmark Systems in Peri-Alpine Lake Thun, Switzerland." Frontiers in Water 3 (August 4, 2021). http://dx.doi.org/10.3389/frwa.2021.666641.

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Pockmarks are crater-like depressions formed by upward fluid flow (gas and/or liquid) through the unconsolidated sediment column on the floor of oceans and lakes. While pockmarks are well described in the marine realm, they have essentially been overlooked in lacustrine settings, likely due to a lack in economic interest to apply high-resolution hydroacoustic techniques in lakes. A swath-bathymetry survey on Lake Thun, Switzerland, revealed the existence of three pockmark systems. One pockmark (110 m in diameter) was discovered near a big karst system at Beatenberg at a water depth of ~217 m. Its activity is probably associated with episodic groundwater seepage induced by earthquakes, floods and snowmelt. At another site, Daerligen, we detected at ~60 m water depth the presence of multiple smaller pockmarks (~1.5 to 10 m in diameter) that seem to be active, continuously liberating CH4 gas by bubble ebullition. The CH4 displayed a biogenic carbon isotopic signature, however, the exact origin of the gas remains unknown. The third site, Tannmoos (~35 m water depth), comprises two large pockmarks (20–43 m in diameter) connected to a karst system in gypsum-carrying bedrock. One of these pockmarks is constituted of several unit pockmarks (e.g., sub-pockmarks; 0.3 to 0.8 m in diameter). While strong evidence is still lacking, we suggest that groundwater discharge occasionally occurs through these unit pockmarks during periods of intense precipitation. Hence, this study reveals the existence of three pockmark systems of variable morphology and mechanisms of formation within the same lake, reflecting different hydrological and biogeochemical regimes. Moreover, it underscores the potential importance of pockmarks in influencing hydrological and CH4 budgets in lakes. Clearly more work on quantifying seasonal fluxes of groundwater and CH4 release via lacustrine pockmarks is required, and it needs to be seen whether the observations made in Lake Thun are universal and apply also to many other lacustrine environments worldwide.
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