Potentiel de migration des écosystèmes côtiers meubles québécois de l’estuaire et du golfe du Saint-Laurent dans le contexte de la hausse appréhendée du niveau de la mer

Bernatchez, Pascal; Quintin, Chantal

doi:10.7202/1036507ar

Cited by 6 publications

(11 citation statements)

References 46 publications

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“…According to the WW3 hindcast (1979–2010) (Bernatchez et al, ), waves offshore of Sainte‐Luce are mainly from northeast (28%) and west (23%) (Figure c). Yearly significant wave height ( H m0 ) reaches 2.1 m. On December 6, 2010, a storm occurred at high tide on the area between Rimouski and Sainte‐Flavie (Figure b).…”

Section: Methodsmentioning

confidence: 99%

Multihazard simulation for coastal flood mapping: Bathtub versus numerical modelling in an open estuary, Eastern Canada

David

Baudry

Bernatchez

et al. 2018

J Flood Risk Management

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Funding informationFonds Québécois de la recherche sur la nature et les technologies; Québec Ministry of Public Security Coastlines along the St. Lawrence Estuary and Gulf, Eastern Canada, are under increasing risk of flooding due to sea level rise and sea ice shrinking. Efficient and validated regional-scale coastal flood mapping approaches that include storm surges and waves are hence required to better prepare for the increased hazard. This paper compares and validates two different flood mapping methods: numerical flood simulations using XBeach and bathtub mapping based on total water levels, forced with multihazard scenarios of compound wave and water level events. XBeach is validated with hydrodynamic measurements. Simulations of a historical storm event are performed and validated against observed flood data over ã 25 km long coastline using multiple fit metrics. XBeach and the bathtub method correctly predict flooded areas (66 and 78%, respectively), but the latter overpredicts the flood extent by 36%. XBeach is a slightly more robust flood mapping approach with a fit of 51% against 48% for the bathtub maps. Deeper floodwater by~0.5 m is expected with the bathtub approach, and more buildings are vulnerable to a 100-year flood level. For coastal management at regional-scale, despite similar flood extents with both flood mapping approaches, results suggest that numerical simulati on with XBeach outperforms bathtub flood mapping.

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Section: Methodsmentioning

confidence: 99%

Multihazard simulation for coastal flood mapping: Bathtub versus numerical modelling in an open estuary, Eastern Canada

David

Baudry

Bernatchez

et al. 2018

J Flood Risk Management

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“…Average significant wave height (Hs) drops from 0.40 m to 0.13 m between points VB1 and VB2; whereas 99 th percentile Hs drops from 2.83 m J o u r n a l P r e -p r o o f Journal Pre-proof to 1.15 m. Results of instrumental measurements (AWAC profilers, noted AW1 and AW2 on figs. 1-II and 1-III) made in the foreshore and nearshore domains at Penouille during autumn 2010 and 2011 confirmed this attenuation of the wave towards the inner part of the bay, waves height being observed to dampen by 40 to 60 % between AW1 and AW2 (Bernatchez et al, 2013). This attenuation of wave-energy is due to the action of the subtidal bars that extensively cover the nearshore domain of the two study sites, even if this influence rapidly declines as water-level increases (Bernatchez et al, 2013).…”

Section: Local Hydrodynamic Settingsmentioning

confidence: 59%

“…1-II and 1-III) made in the foreshore and nearshore domains at Penouille during autumn 2010 and 2011 confirmed this attenuation of the wave towards the inner part of the bay, waves height being observed to dampen by 40 to 60 % between AW1 and AW2 (Bernatchez et al, 2013). This attenuation of wave-energy is due to the action of the subtidal bars that extensively cover the nearshore domain of the two study sites, even if this influence rapidly declines as water-level increases (Bernatchez et al, 2013). Despite such low wave amplitudes, which are typical of fetchlimited coasts, joint occurrences of high-water levels and short waves (i.e.…”

Section: Local Hydrodynamic Settingsmentioning

confidence: 59%

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Importance of coarse sedimentation events in the resilience of microtidal back-barrier saltmarshes to sea-level rise

et al. 2022

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“…Indeed, rigid protection keeps sand away from the coast, lowers the levels of beaches and contributes to beach erosion. Thus, while climate change increases the probability and intensity of hazards, the absorption capacity of coasts decreases and vulnerability (population exposure) increases (Bernatchez and Quintin, 2016). In this context, it is necessary to integrate the creation of buffer zones and open spaces into land-use planning to reduce the exposure of populations and infrastructures in at-risk areas (Buffin-Bélanger et al, 2015;Bernatchez and Quintin, 2016), in order to ensure the long-term resilience of Quebec's coastal municipalities.…”

Section: Hazards and Issues At Stakementioning

confidence: 99%

Quantifying Psychosocial Impacts From Coastal Hazards for Cost-Benefit Analysis in Eastern Quebec, Canada

Boyer-Villemaire¹,

Kanli²,

Ledoux³

et al. 2021

Front. Clim.

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The assessment of psychosocial impacts related to coastal hazards (erosion, submersion) has so far been mainly qualitative. As cost-benefit analysis is gaining popularity among communities to assess adaptation options in the face of increasing coastal hazards, there is a need to develop quantitative indicators to improve the inclusion of human impacts in decision-making. The project therefore aimed to suggest quantitative indicators for a cost-benefit analysis in the Lower St. Lawrence region exposed to the waters of the estuary of the St. Lawrence River in eastern Quebec, Canada. A systematic survey of five municipalities was conducted in 2019 (n = 101). In general, the prevalence of mental health impacts was the double than that of physical health (30 vs. 14%); and was higher for affected respondents: 50.0 and 23.9%, against 13.5 and 5.8% for unaffected respondents.With regards to psychosocial impacts, the main results were that affected people were 2.33 more stressed in normal times than unaffected respondents and this variation increased to 3.54 during a storm surge warning;the quality of sleep of affected respondents when a storm warning is issued was 2.39 poorer than that of unaffected respondents.With regards with economic impacts, an additional 11% in absenteeism has been observed among respondents affected;the likelihood of experiencing financial difficulties was 1.27 higher for those affected;a small subgroup of affected respondents (<10) declared a mean of 400 CAD of additional health expenses.The results show that the assistance received provides little protection against stress, or even increases it, if it is mainly financial. In addition, a high degree of social isolation and living alone increases stress in the face of hazards. Thus, social capital and psychosocial assistance act as a protective factor in reducing psychosocial impacts. The probability of financial stress, on the other hand, increases in the event of maladaptation (inefficient adaptation expenditures leading to repair costs). Overall, the importance of the impacts measured justifies further economical investigation for their inclusion in the cost-benefit analysis.

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Potentiel de migration des écosystèmes côtiers meubles québécois de l’estuaire et du golfe du Saint-Laurent dans le contexte de la hausse appréhendée du niveau de la mer

Cited by 6 publications

References 46 publications

Multihazard simulation for coastal flood mapping: Bathtub versus numerical modelling in an open estuary, Eastern Canada

Multihazard simulation for coastal flood mapping: Bathtub versus numerical modelling in an open estuary, Eastern Canada

Importance of coarse sedimentation events in the resilience of microtidal back-barrier saltmarshes to sea-level rise

Quantifying Psychosocial Impacts From Coastal Hazards for Cost-Benefit Analysis in Eastern Quebec, Canada

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