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Numerical Study on Measures for Protecting the Go-Cong Coastlines (Vietnam) from Erosion

Authors :
Dinh Cong San
Nguyen Binh Duong
Nguyen Cong Phong
Le Xuan Tu
Damien Pham-Van-Bang
Sylvain Guillou
Kim Dan Nguyen
Source :
Water; Volume 14; Issue 23; Pages: 3850
Publication Year :
2022
Publisher :
Multidisciplinary Digital Publishing Institute, 2022.

Abstract

Every year, in the Vietnam Mekong Delta Coastal Zone (VMDCZ), erosions cause approximately 300 ha of agricultural land loss. Therefore, measures for shoreline protection are urgently needed. This paper discusses the impacts of protection measures in the Go-Cong Coastal Zone to prevent erosion/accretion processes, predicted by two numerical models, MIKE21-FM and TELEMAC-2D. Hard and soft measures have been proposed using breakwaters and sandbars, respectively. The simulations show that the erosion/accretion trends provided by both models are similar. For breakwaters, MIKE21-FM provides less accretion than TELEMAC-2D in areas extending over 300 m and 500 m from shorelines. However, for sandbars, MIKE21-FM shows higher accretion within areas extending over 500 m but less than 300 m. Sandbars cause higher accretion in a larger area, extending over 1000 m offshore. The simulation results allow us to propose two alternative measures: (1) a row of several breakwater units will be implanted at 300 m offshore. The length of each unit is 600 m, with a gap between two neighbouring units of 70 m and a crest elevation of 2.2 m above mean sea level (MSL). (2) A row of sandbar units will be posed at 500 m offshore, with a unit length of 1000 m and a gap between the two neighbouring units of 200 m. The crest elevation is fixed at MSL.

Details

Language :
English
ISSN :
20734441
Database :
OpenAIRE
Journal :
Water; Volume 14; Issue 23; Pages: 3850
Accession number :
edsair.doi.dedup.....be889baeb5f6ccce545e0e668a92c41b
Full Text :
https://doi.org/10.3390/w14233850