Shoreline change of the Mekong River delta along the southern part of the South China Sea coast using satellite image analysis (1973-2014) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Géomorphologie : relief, processus, environnement Année : 2016

Shoreline change of the Mekong River delta along the southern part of the South China Sea coast using satellite image analysis (1973-2014)

Résumé

The Mekong River delta is the world's third largest delta, consequence of a favourable morphosedimentary setting, high sediment supply and rapid growth during the Holocene. Analysis of Landsat satellite images from 1973 to 2014 shows that nearly 70% of the 160km - long South China Sea shoreline of the delta has strongly eroded. This trend represents a reversal of the massive, long-term Holocene progradation that characterized this part of the delta. Erosion and land loss along the South China Sea coast are not related to lobe switching, but more likely to decreasing river sediment supply and variations in patterns of sediment storage in the delta that appear to be due to human-induced modifications. These include fluvial sediment trapping by dams, enhanced subsidence due to massive groundwater abstraction, and riverbed aggregate extractions. Shoreline erosion is further exacerbated by the replacement of protective mangroves by shrimp farms. This erosion constitutes an additional hazard to the future integrity of a mega-delta already considered particularly vulnerable to subsidence, and to future large-capacity dams.
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Dates et versions

hal-01758961 , version 1 (05-04-2018)

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Manon Besset, Edward J. Anthony, Guillaume Brunier, Philippe Dussouillez. Shoreline change of the Mekong River delta along the southern part of the South China Sea coast using satellite image analysis (1973-2014). Géomorphologie : relief, processus, environnement, 2016, 22 (2), pp.137-146. ⟨10.4000/geomorphologie.11336⟩. ⟨hal-01758961⟩
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