08/12/2016 2:00 PM GMT+7 TP HCM
Hoi An, located in central Viet Nam, around 25 kilometres south of Danang (Figure 1), is one of the most beautiful cities of Vietnam. The old town of Hoi An is listed as a UNESCO World Heritage site. Since October 2004, this well-known tourist site is under threat by severe erosion.
Cua Dai Beach, north of the Thu Bon river mouth, has retreated by almost 200m and the river channel itself has shifted south by 250m. Several construction sites at tourist resorts were swallowed by waves, bringing work to a complete standstill.
The erosion process becomes increasingly threatening, possibly for the old town itself. Current solutions for coastal erosion are temporary and would not achieve sustainable outcomes, and might in fact do the opposite. Generally, studies remain qualitative, based on aerial and satellite images of the site.
Quantitative assessments using in-situ observations and numerical models are lacking, although they are needed in order to firmly endorse any of the proposed assumptions. This is what the present project is proposing.
The project will be to provide the large scale forcing environment of the study site (waves, tides, winds), using global solutions and produce local coupled wave-current-sediment 3D model solutions (using ROMS/CROCO) and to provide very high-resolution 2D model solutions of circulation and sediment transport for the nearshore zone and estuary (using TELEMAC2D).
These models will be used to expose the alongshore and cross-shore processes at work and test changes in sediment balance associated with changes in upstream sediment sources and various coastal protection measures. Institutes: CARE, HCMUT, WRU, VIASM, LEGOS
From 2014, CARE-Rescif projects have been conducted in Hochiminh city and surrounding provinces. One of these joint projects is “Assessment trace metals in water and sediment in Saigon basin and study on the correlation between water and sediment”
The CARE-Rescif project “Arsenic Occurrence and Contamination in Sediment and Groundwater in An Phu District, An Giang Province”
The LMD coastal area is influenced by waves, tides, changing sediment loads from the Mekong and Saigon-Dong Nai river system, and storm surges from the East and West Sea.
The automatic weather monitoring station* has been installed at the Asian Center for Water Research (CARE), HCM University of Technology – VNU (10.774551 of latitude and 106.661356 longitude). The CARE-HCMUT weather station records continuous measurement in real-time for key parameters such as: temperature, relative humidity, atmospheric pressure, wind speed/direction, global solar radiation and rainfall.