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Jeudi 5 Avril - Coastal erosion of the Mekong delta: from processes to countermeasures

Par SEMSOU Dernière modification 21/03/2018 10:37
Quand ? Le 05/04/2018,
de 14:00 à 15:00
Où ? salle Lyot
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Patrick Marchesiello

LEGOS

 

Title: Coastal erosion of the Mekong delta: from processes to countermeasures

 

Abstract: The Lower Mekong Delta Coastal Zone (LMDCZ) is emblematic of the coastal erosion problem in tropical delta regions. It has been generated by very large sedimentary fluxes reaching the ocean, but modulated also by waves and currents, which, in combination, redistribute the river intake to the southwest. This process has formed the southern tip of Vietnam for the last 3500 years. But now, in addition to natural forces, the LMDCZ is affected by local human activity, including reduction of river fluxes due to damming and sand mining, and reduction of protective coastal mangroves in favor of agriculture and aquaculture. Relative sea level rise is also a major challenge, although global warming is a minor factor in the current situation when compared with land subsidence due to groundwater extraction. Here, we present the findings of a European-Vietnamese project with the dual objectives of: 1) better assessing the hierarchy of causality for observed erosion patterns; and 2) proposing engineering solutions at two specific sites. A discussion on various aspects of coastal science is proposed based on questions that emerged from the project, e.g., what are the paradigms needed for understanding coastal erosion and protection measures in delta coastal zones? How do we handle the gap between science and civil engineering as researchers, particularly at IRD?


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