Observations of wave run-up and groundwater seepage line motions on a reflective-to-intermediate, meso-tidal beach

Vousdoukas, Michalis

doi:10.1016/j.margeo.2014.02.005

Cited by 25 publications

(30 citation statements)

References 56 publications

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“…Even without considering the wave-driven morphological change during extreme events, swash processes result in an additional contribution to the TWLs through wave run-up (Stockdon et al, 2006;Vousdoukas, 2014;Vousdoukas et al, 2012c). Despite its importance, wave run-up was not included in the present analysis since (i) its estimation requires the beach-face slope as input, information which is missing for most of the European coastline; (ii) swash-related water level fluctuations typically have periods of seconds, and thus take place at smaller temporal scales than the other TWL components.…”

Section: Towards An Improved Approach For Pan-european Coastal Flood mentioning

confidence: 99%

Developments in large-scale coastal flood hazard mapping

Vousdoukas

Voukouvalas

Mentaschi

et al. 2016

Nat. Hazards Earth Syst. Sci.

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187

157

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Abstract. Coastal flooding related to marine extreme events has severe socioeconomic impacts, and even though the latter are projected to increase under the changing climate, there is a clear deficit of information and predictive capacity related to coastal flood mapping. The present contribution reports on efforts towards a new methodology for mapping coastal flood hazard at European scale, combining (i) the contribution of waves to the total water level; (ii) improved inundation modeling; and (iii) an open, physics-based framework which can be constantly upgraded, whenever new and more accurate data become available. Four inundation approaches of gradually increasing complexity and computational costs were evaluated in terms of their applicability to large-scale coastal flooding mapping: static inundation (SM); a semidynamic method, considering the water volume discharge over the dykes (VD); the flood intensity index approach (Iw); and the model LISFLOOD-FP (LFP). A validation test performed against observed flood extents during the Xynthia storm event showed that SM and VD can lead to an overestimation of flood extents by 232 and 209 %, while Iw and LFP showed satisfactory predictive skill. Application at panEuropean scale for the present-day 100-year event confirmed that static approaches can overestimate flood extents by 56 % compared to LFP; however, Iw can deliver results of reasonable accuracy in cases when reduced computational costs are a priority. Moreover, omitting the wave contribution in the extreme total water level (TWL) can result in a ∼ 60 % underestimation of the flooded area. The present findings have implications for impact assessment studies, since combination of the estimated inundation maps with population exposure maps revealed differences in the estimated number of people affected within the 20-70 % range.

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Section: Towards An Improved Approach For Pan-european Coastal Flood mentioning

confidence: 99%

Developments in large-scale coastal flood hazard mapping

Vousdoukas

Voukouvalas

Mentaschi

et al. 2016

Nat. Hazards Earth Syst. Sci.

Self Cite

187

157

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“…Groundwater discharge in the intertidal zone seaward of the exit point also varies over time and space [ Turner and Masselink , ; Li et al ., ; Butt et al ., ; Hays and Ullman , ; Michael et al ., ; Rosenberry et al ., ]. The location of the exit point has been identified in prior work as the interface between the unsaturated and saturated beachface (hereafter referred to as the surface saturation boundary ), the area seaward of which appears as a shiny and glassy surface [ Aagaard and Holm , ; Holman et al ., ; Cartwright et al ., ; Puleo , ; Huisman et al ., ; Vousdoukas , ].…”

Section: Introductionmentioning

confidence: 99%

“…The dynamics of the surface saturation boundary have been the focus of previous field studies investigating groundwater‐surface water interactions in the swash zone. Red‐green‐blue (RGB) imaging systems have been used to identify and track the surface saturation boundary as a proxy for subaerial discharge at the time scale of individual swash events, as this technique provides continuous data collection at high spatial and temporal resolution [ Aagaard and Holm , ; Holman et al ., ; Puleo , ; Huisman et al ., ; Vousdoukas , ]. The surface saturation boundary can also be tracked manually by visual inspection of the beachface [ Cartwright et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Coupled surface‐subsurface hydrologic measurements reveal infiltration, recharge, and discharge dynamics across the swash zone of a sandy beach

Heiss

Puleo

Ullman

et al. 2015

Water Resources Research

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Swash‐groundwater interactions affect the biogeochemistry of beach aquifers and the transport of solutes and sediment across the beachface. Improved understanding of the complex, coupled dynamics of surface and subsurface flow processes in the swash zone is required to better estimate chemical fluxes to the sea and predict the morphological evolution of beaches. Simultaneous high‐frequency measurements of saturation, water table elevation, and the cross‐shore locations of runup and the boundary between the saturated and unsaturated beachface (surface saturation boundary) were collected on a sandy beach to link groundwater flow dynamics with swash zone forcing. Saturation and lysimeter measurements showed the dynamic response of subsurface saturation to swash events and permitted estimation of infiltration rates. Surface and subsurface observations revealed a decoupling of the surface saturation boundary and the intersection between the water table and the beachface. Surface measurements alone were insufficient to delineate the infiltration and discharge zones, which moved independently of the surface saturation boundary. Results show for the first time the motion and areal extent of infiltration and recharge zones, and constrain the maximum size of the subaerial discharge zone over swash and tidal time scales. The width of the infiltration zone was controlled by swash processes, and subaerial discharge was controlled primarily by tidal processes. These dynamics reveal the tightly coupled nature of surface and subsurface processes over multiple time scales, with implications for sediment transport and fluid and solute fluxes through the hydrologically and biogeochemically active intertidal zone of sandy beaches.

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“…Estudos recentes (VOUSDOUKAS et al, 2014b;HUGHES et al, 2014) empregaram sistemas de vídeo imageamento para o conhecimento da morfodinâmica praial através da análise espectral do espraiamento máximo.…”

Section: Sistema De Monitoramento Por Vídeo Imagensunclassified

“…Além de determinar a faixa referente a linha de costa, o espraiamento é uma importante região para pesquisas relacionadas aos processos costeiros, gerenciamento e obras no ambiente praial (VOUSDOUKAS et al, 2012c). Assim, estudos realizados na última década (MUEHE, 2001;ELFRINK & BALDOCK, 2002) utilizaram o comportamento do máximo do espraiamento (runup), para estabelecer critérios relacionados aos limites da zona non aedifi candi na elaboração de projetos para orlas.…”

Section: Introductionunclassified

Aspectos Sobre O Estado Da Arte De Estudos Da Zona De Espraiamento

Vicente

Pereira

2017

Rev. Bras. Geomorfol.

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Resumo:Dentro do ambiente praial, a zona de espraiamento pode ser considerada como o sub-região mais dinâmico da zona costeira. Muito disso se deve ao fato do espraiamento representar as respostas dos processos hidrodinâmicos externos ocorridos em regiões anteriores a este subambiente (zona de arrebentação e surfe). Assim, o clima de ondas e a amplitude da maré são variáveis indispensáveis nos estudos que tem buscado cada vez mais a quantifi cação destes fenômenos. Os métodos utilizados nestes estudos acompanham a evolução tecnológica dos dias atuais empregando desde de ferramentas de medição in situ, sinais acústicos, sensoriamento remoto, e outros que utilizam técnicas sofi sticadas de lasers e scanners. Com isso, é possível a obtenção de uma gama de dados sufi cientes para que sejam aplicadas abordagens multidisciplinares com enfoque nos processos físicos da interpretação dos resultados. São considerados processos como o transporte de sedimentos e suas implicações, infi ltração/exfi ltração de água na face praial, assim como a saturação, a infl uência da declividade observada no perfi l praial, componentes e feições morfológicas são focalizados nestes estudos. Desse modo, foi comprovado que a depender do estágio praial, determinado movimento no ciclo do espraiamento irá infl uenciar de maneira mais direta a evolução morfológica, como também o desenvolvimento de feições características. Todos estes resultados buscam compreender a relação existente entre a evolução de um determinado processo e as variações dentro da zona de espraiamento. Com a avaliação dos estudos, observa-se a importância desta faixa para o desenvolvimento morfológico da região subaérea praial, uma vez que esta faixa determina toda variação que ocorrerá no perfi l. Os trabalhos também direcionam novos rumos para as pesquisas relacionadas ao espraiamento, sendo necessárias abordagens cada vez mais precisas e detalhadas deste ambiente,

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Observations of wave run-up and groundwater seepage line motions on a reflective-to-intermediate, meso-tidal beach

Cited by 25 publications

References 56 publications

Developments in large-scale coastal flood hazard mapping

Developments in large-scale coastal flood hazard mapping

Coupled surface‐subsurface hydrologic measurements reveal infiltration, recharge, and discharge dynamics across the swash zone of a sandy beach

Aspectos Sobre O Estado Da Arte De Estudos Da Zona De Espraiamento

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