Flow dynamics in the Long Xuyen Quadrangle under the impacts o f full-dyke systems and sea level rise

• Main Authors: Van Pham Dang Trí, Nguyen, Hieu Trung, Nguyen, Thanh Tuu
• Format: Article
• Language: English
• Published: ĐHQGHN 2017
• Subjects: One dimensional (ID ) hydrodynamics model; Flow dynamics; full-dyke systems; HEC-RAS; Long Xuyen Quadrangle.
• Online Access: http://repository.vnu.edu.vn/handle/VNU_123/56582
• Institution: Vietnam National University, Hanoi

A one-dimensional (ID ) hydrodynamic model for the river network o f the Long Xuyen Quadrangle, Vieứiamese Mekong Delta, was developed in HEC-RAS based on; (i) Available data o f river network and cross-sections deployed in the ISIS-ID hydrodynamics model for the whole Mekong Delta (including the Vietnamese and Cambodia parts); and, (ii) Field-based data to update ứie existing river network and iull-dyke systems. Developed scenarios included: (i) Scenario 1: The measured geom eừic data in 2000 (no dykes constructed), and upsưeam discharge and sea level measured m 2000; (ii) Scenario 2: The developed flill-dyke systems, and upstream discharge and sea level measured in 2000; and, (iii) Scenario 3: The geometry and upsfream discharge remained similar to Scenario 2 while the sea level was supposed to be 30 cm greater than that in 2000 (in both the East and W est Sea). B y comparing Scenario 1 and 2, possible impacts o f the full-dyke systems to the area could be examined while by comparing Scenario 2 and 3, impacts o f sea level rise would be evaluated in ứie context o f ứie deployed full-dyke systems.