Ho Chi Minh Ville, des inondations à la submersion…

Vachaud, G.; Gratiot, Nicolas; Ngoc, Tien Dung Tran

doi:10.4000/echogeo.19473

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…What's more, given its amphibious character marked above all by the presence of the river in a context of gradual return of rains in the Sahel [60][61][62], the risk of fluvial overflow exacerbated by soil subsidence and a rise in the river's water level induced by the gradual return of rains is obvious. The same observation is made by [63,64], who show that the city of Ho Chi Minh in Vietnam is subject to fluvial flooding due to the subsidence of the topography and the increased flow of the Saigon River.Our results are in line with those produced by [65,66], in the Mekong delta in Vietnam, in Spain in the Seville river by [67] ; [68] in Poland in the Chechło river; [69] in Hungary and [44] in the Ganges-Brahmaputra-Meghna delta and [70] in the Fraser River delta. Today, many factors are indexed by the scientific community as being the cause of subsidence.…”

Section: Discussionsupporting

confidence: 71%

“…Heavy infrastructure can be a trigger for topographic subsidence [83], especially in loose structures. According to [64], the weight of buildings leads to mechanical settlement of soils, which amplifies the subsidence trend. On an 2.15 Km stretch of the Langue de Barbarie, a protective dike was under construction over the time sequence chosen to track topographical subsidence.…”

Section: Discussionmentioning

confidence: 99%

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The Potential Impact of Rising Sea Levels and Subsidence on Coastal Flooding Along the Northern Coast of Saint-Louis, Senegal

CISSE,

BREMPONG,

ALMAR

et al. 2024

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In today's context of rising sea levels and subsiding land topography, coastal flooding is a major concern for coastal areas, both nationally, regionally, and internationally. A detailed understanding of these two phenomena is a prerequisite for effective coastal flood management. The main objective of the present study is to contribute to the understanding of the impact of subsidence and sea-level rise on coastal flooding in Saint-Louis, and in particular the Langue de Barbarie, by producing a vulnerability map of submerged surfaces. To this end, the Synthetic Aperture Radar (SAR) interferometry technique is used to process a time series of Sentinel-1 images and estimate land subsidence in the Saint-Louis and Langue de Barbarie area. Interferometric SAR (InSAR) measurements are merged with RCP 2.6 sea-level rise scenarios to identify predicted flooded areas and provide a flood vulnerability map. At the Langue de Barbarie, topographic subsidence is estimated at between -6.4 and -0.4mm/year. In this study, we show that local land subsidence may increase vulnerability to flooding caused by sea-level rise based on 2100 projections. This may represent an increase in the flood zone in the study area. Based on the RCP 2.6 scenario and the subsidence rates obtained, a significant part of the St. Louis coastline and city would be subject to coastal and fluvial flooding for the years 2040 and 2100. For these dates, 29 to and 36 Km2 of the studied area would be occupied by water. Given this situation, research in Saint-Louis needs to focus on adaptation scenarios to coastal risks, to protect coastal communities and safeguard the city's historical heritage.

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

The Potential Impact of Rising Sea Levels and Subsidence on Coastal Flooding Along the Northern Coast of Saint-Louis, Senegal

CISSE,

BREMPONG,

ALMAR

et al. 2024

Preprint

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Assessing typhoon-induced compound flood drivers: a case study in Ho Chi Minh City, Vietnam

Rodrigues do Amaral,

Gratiot,

Pellarin

et al. 2023

Nat. Hazards Earth Syst. Sci.

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Abstract. We investigate the most severe rainfall event ever experienced in Ho Chi Minh City (HCMC), Vietnam. It occurred on 25 November 2018 when Typhoon (TY) Usagi directly hit HCMC. During this event, there was more than 300 mm of rainfall over 24 h which led to flooding and considerable material damage. We propose an in-depth study of TY-induced, compound flood drivers at a short timescale by focusing on the days before and after the event. We use a set of data analysis and signal processing tools to characterize and quantify both coastal and inland effects on the hydrosystem. We found that TY Usagi made landfall without forming a significant storm surge. The extreme rainfall does not translate into immediate river discharge but presents a 16 h time lag between peak precipitation and peak residual discharge. Nevertheless, increased river water levels can be seen at both urban and upstream stations with a similar time lag. At the upstream river station, residual discharge represents 1.5 % of available rainwater, and evidence of upstream widespread flooding was found. At the urban river station, we assess the potential surface runoff during the event to be 8.9 % of the upstream residual discharge. However, a time lag in peak river water level and peak rainfall was found and attributed to the combination of high tide and impervious streets which prevented the evacuation of rainwater and resulted in street flooding of up to 0.8 m. Overall, it was found that despite not having a significant storm surge, the coastal tidal forcing is the predominant compound flood driver even during severe, heavy rainfall with tidal fluctuations in river water level and respective discharge much larger than the residuals.

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Ho Chi Minh Ville, des inondations à la submersion…

Cited by 2 publications

References 14 publications

The Potential Impact of Rising Sea Levels and Subsidence on Coastal Flooding Along the Northern Coast of Saint-Louis, Senegal

The Potential Impact of Rising Sea Levels and Subsidence on Coastal Flooding Along the Northern Coast of Saint-Louis, Senegal

Assessing typhoon-induced compound flood drivers: a case study in Ho Chi Minh City, Vietnam

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