David Didier

David Didier
Université du Québec à Rimouski UQAR | uqar

PhD. Coastal hazards and geomorphology
Arctic coastal hazards and morphodynamics

About

36
Publications
10,244
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125
Citations

Publications

Publications (36)
Article
An improved understanding of the resilience capacity of salt-marsh environments, which are recognized as one of the most vulnerable yet valuable coastal morpho-sedimentary systems is important for enhancing resilience to future sea-level rise. The aim of this study is to provide a long-term (multi-centennial) context to the capacity of response of...
Poster
Full-text available
La région Arctique est particulièrement fragilisée par les changements climatiques, où le réchauffement est deux à trois fois plus élevées qu’ailleurs sur la planète. On note une diminution massive de l’étendue et de l’épaisseur de la glace de mer, ce qui prolonge la période d’eau libre de glace et qui expose les côtes aux évènements de tempêtes pr...
Article
Impacts from a changing climate, in particular sea-level rise, will be most acutely felt on small oceanic islands. A common configuration of mid-latitude islands is the sandy barrier island. Sable Island, Nova Scotia, Canada is a vegetated sand island near the shelf edge, 160 km from the nearest point of land, that is morphologically similar to a b...
Presentation
Knowledge of empirical equations relating offshore wave conditions and nearshore dynamics are essential in coastal engineering and coastal risk assessments. Swash, which is the high-frequency component of coastal water levels, has been extensively studied on ‘warm’ beaches (i.e. not affected by cryogenic processes). Several formulations have been s...
Conference Paper
Full-text available
Contrasting coastal environments are present along Canada’s northern coastline, making adaptation strategies highly site-speciEc. To better understand the response of Arctic and Subarctic coasts to increasing environmental pressure, shoreline changes in the 14 communities of Nunavik (northern Quebec, Canada) were investigated. Shoreline positions w...
Article
Empirical models of wave runup are commonly derived from open beaches, but their applicability in fetch-limited, sheltered environments are yet to be properly assessed. Based on original video-derived runup observations on 5 beaches with distinct morphodynamic states in the Estuary and Gulf of St. Lawrence (EGSL), this paper presents a runup analys...
Conference Paper
Along the Estuary and Gulf of St. Lawrence (EGSL), nearshore ice complex (NIC) influences coastal dynamics, especially on sandy coasts where it causes erosion, transport and sediment accumulation. NIC morphology evolves under various wave, tide and meteorological conditions. Impacts of climate change such as increasing winter temperature and freeze...
Article
Full-text available
Coastal management often relies on large-scale flood mapping to produce sea level rise assessments where the storm-related surge is considered as the most important hazard. Nearshore dynamics and overland flow are also key parameters in coastal flood mapping, but increase the model complexity. Avoiding flood propagation processes using a static flo...
Article
Full-text available
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 vali...
Conference Paper
Coastal hazards in Eastern Canada are mainly associated to storm conditions: storm surge and high waves generate coastline erosion and flooding. There is a critical need to develop effective tools for coastal management as sea ice reduction and sea level rise will likely impact future coastal hazards. In recent years, a simple and operational metho...
Conference Paper
While recent studies highlighted the great mobility of boulder beaches related to the impact of storm waves, numerous researches are still needed to better understand the morphodynamic of coastal boulder accumulations. This paper provides original data about storm-induced geomorphic processes and their impact on the Valahnúkur coastal barrier. Firs...
Conference Paper
Une méthodologie simple et opérationnelle permettant d’évaluer le niveau de risque associé à l’érosion et à la submersion côtière a été développée en collaboration avec le ministère de la Sécurité publique du Québec. Le développement s’est effectué sur un secteur de la MRC de La Mitis qui connait déjà des problématiques liées aux aléas côtiers (30...
Article
Full-text available
Increasingly used shore-based video stations enable a high spatiotemporal frequency analysis of shoreline migration. Shoreline detection techniques combined with hydrodynamic conditions enable the creation of digital elevation models (DEMs). However, shoreline elevations are often estimated based on nearshore process empirical equations leading to...
Presentation
Cette synthèse les positionne dans le contexte d’une gestion de risque, synthétise les facteurs qui contraignent son fonctionnement et souligne des critères de réussite.
Presentation
Depuis les « grandes marées » de 2010, le Saint-Laurent est très médiatisé : des tempêtes à répétition ont causé des dommages sur les côtes, et plusieurs résidences ont été submergées. Théoriquement, la submersion de 2010 avait une récurrence très faible, supérieure à 100 ans. Or, à la veille de l’année 2017, des submersions extrêmes ont massivemen...
Article
Full-text available
Early warning systems (EWS) are methods implemented in natural risk management. For many decades, they have been applied to all kinds of hazards, especially water-related and geological ones, but are rarely effective. In the last few decades, the Province of Quebec was hit by many water-related hazards (ice storms, inland and coastal flooding, coas...
Article
Full-text available
Wave runup in a shore platform environment has been acquired by in situ measurements at high tide and along field debris following the December 6, 2010, flood near Rimouski (Quebec, Canada), south coast of the St. Lawrence estuary. Using offshore wave data and beach slopes, a linear empirical runup relationship has been adjusted to the study site a...
Presentation
Au Québec, aucun zonage de la submersion n’existe. Les rives du Saint-Laurent sont gérées comme celles des autres cours d’eau. L'effet des vagues et de la géomorphologie littorale sont donc omis, sous-estimant l’aléa. Pour intégrer ces composantes, deux études ont été réalisées suite à la tempête du 6 décembre 2010, à Sainte-Luce (Bas-Saint-Laurent...
Article
Full-text available
On 6 December 2010, an extra-tropical storm reached Atlantic Canada, causing coastal flooding due to high water levels being driven toward the north shore of Chaleur Bay. The extent of flooding was identified in the field along the coastline at Maria using DGPS. Using the assumption that the maximum elevation of flooded areas represents the combina...
Presentation
La méthode classique de cartographie de la submersion consiste en une analyse des récurrences de surcotes sur une série temporelle de niveaux marégraphiques. Cette méthode ne considère pas l'effet des vagues et de la géomorphologie, ce qui peut entraîner une sous-estimation des zones à risque de submersion. Afin de mieux comprendre l’effet de ces c...
Technical Report
Dans le cadre du projet Évaluation économique des répercussions des changements climatiques et analyses coûts-avantages d’options d’adaptation aux changements climatiques en zone côtière au Québec, une évaluation de certains secteurs sensibles à la submersion doit être réalisée. Dans ce travail, une partie du territoire de la municipalité de Maria...
Conference Paper
Le 6 décembre 2010, une dépression engendrait la submersion du littoral de l’estuaire et du golfe du Saint-Laurent. Il s’agissait de la conjoncture d’une pleine mer supérieure de vive eau, d’une surcote, et du wave runup, soit l’amplitude entre la limite supérieure du jet de rive et le niveau de la mer sans agitation. Après la tempête, les limites...
Poster
Full-text available
Synthetic aperture radar (SAR) data from RADARSAT-2 allows monitoring of sea ice in operational setting. To complete its mission, the Canadian Ice Service needs parameters such as ice-edge location, stage of development and ice concentration. Due to contrast variations driven by sea state and winds, such parameters can be difficult to define. In Fe...
Poster
Full-text available
Ice canoe was once a transportation mean during winter in Quebec to cross the St. Lawrence river. We used it as research tool in hardly accessible sea ice condition.

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Projects

Projects (5)
Project
The goal of this PhD research project is to detect, classify, and understand the optical characteristics of Arctic nearshore waters as well as potential implications of variability for productivity in these regions.
Project
ENG: The Arctic region is particularly vulnerable to climate change, where air temperatures are warming two to three times more than elsewhere on the planet. Arctic coasts and coastal communities will be more vulnerable to erosion and flooding due to the decrease in sea ice extent, combined with the warming and thawing of permafrost. Arctic coasts are therefore increasingly exposed to spring and autumn storms, but the morphogenic effect of these storms on the coastline is poorly understood. In Canada, few studies have been conducted on coastal dynamics in this region, while it is experiencing growth in industrial development and maritime traffic, increasing the anthropogenic pressure on exposed areas. This project will therefore create a new database on coastal evolution in Nunavut to study the morphodynamics of the low-lying coasts of the Canadian Arctic Archipelago (CAA) and to measure the impact of cryospheric processes on coastal dynamics. The specific objectives are (1) to assess the effect of sea ice cover reduction on the historical evolution of the CAA coasts; (2) to quantify the multi-scale spatio-temporal variability of the coastlines to establish an optimal methodological framework for understanding coastal dynamics and; (3) to analyse the impact of meteorological and cryospheric conditions on Arctic beaches. The satellite remote sensing approach is supported by coastal monitoring using video imagery in the villages of Kugluktuk and Ikaluktutiak (Cambridge Bay) in order to perform high temporal frequency monitoring of the morphodynamics of selected sites. These in situ observations will allow the validation of coastline and shoreline extraction methods using optical satellite imagery (Landsat-8, Sentinel-2) at the scale of the CAA in order to help decision-makers implement adequate adaptation measures for the Arctic. FR: La région Arctique est particulièrement fragilisée par les changements climatiques, où le réchauffement des températures de l’air est deux à trois fois plus élevé qu’ailleurs sur la planète. Les côtes arctiques et communautés côtières seront plus vulnérables à l’érosion et la submersion en raison de la diminution de l’étendue de glace de mer, combinée au réchauffement et au dégel du pergélisol. Les côtes de l’Arctique sont donc de plus en plus exposées aux tempêtes printanières et automnales, mais l’effet morphogène de ces tempêtes sur le littoral est mal connu. Au Canada, peu d’études ont été menées sur la dynamique côtière dans cette région alors qu’elle connait une croissance dans son développement industriel ainsi que dans son trafic maritime, augmentant la pression anthropique sur les zones exposées. Ce projet procédera donc à créer une nouvelle base de données sur l’évolution côtière au Nunavut afin d’étudier la morphodynamique des côtes basses meubles de l’archipel arctique canadien (AAC) et de mesurer l’incidence des processus cryosphérique sur la dynamique côtière. Les objectifs spécifiques sont (1) d’évaluer l’effet de la réduction du couvert de glace de mer sur l’évolution historique des côtes basses meubles de l’AAC; (2) de quantifier la variabilité spatio-temporelle multi-échelle des littoraux pour établir un cadre méthodologique optimal à la compréhension de la dynamique côtière et; (3) d’analyser l’incidence des conditions météo-marines et cryosphériques sur les plages arctiques. L’approche par télédétection satellitaire est appuyée par une surveillance du littoral par imagerie vidéo dans les villages de Kugluktuk et de Ikaluktutiak (Cambridge Bay) afin d’effectuer un suivi à haute fréquence temporelle de la morphodynamique des sites sélectionnés. Ces observations in situ permettront la validation de méthodes d’extraction du trait de côte et de la ligne de rivage par imagerie satellitaire optique (Landsat-8, Sentinel-2) à l’échelle de l’AAC afin d’aider les décideurs à mettre en place des mesures d’adaptations adéquates pour l’Arctique.
Project
The maritime region of Quebec includes one of the largest estuarine system in the world characterized by seasonally ice-infested waters, connected to the North Atlantic through the Gulf of St. Lawrence. During extreme events (i.e. concomitant high waves and storm surge), these environments are vulnerable to coastal hazards such erosion and coastal flooding. In order to support coastal risk management and adaptation strategies in a context of sea level rise and spatial reduction in sea ice cover, the Research Chair in Coastal Geoscience (LDGIZC) implemented the MoDesCo project. It aims to assess the future geographic distribution of flood-erosion events along the Estuary and Gulf of St. Lawrence (EGSL) (present-2100).