This study revealed great potential and shortcoming of offshore wind energy in Vietnam by numerical simulations with Weather Research and Forecasting (WRF) model at 10-km resolution for 10 years (2006−2015). The greatest energy potential was found in the offshore area of Phu Quy island (Binh Thuan province). The area, alone, can provide the 38.2 GW power generation capacity corresponding to the increasing renewable-energy demand by 2030 planned by the country. There is also a drawback of the wind resource, which is associated with strong multiplescale temporal variabilities. The seasonal variability associated with monsoon onsets and daily variability associated with the wind diurnal cycles were found ranging 30−50%. Meanwhile, the inter-annual variability could reach up to 10%. These variabilities must be considered when designing wind farms and grids over the region. Additionally, due to the fact that the WRF model performed climatological features of the winds well against the observations, this results indicate that it can be useful tools for windpower assessment as compared to other reanalysis or QuikSCAT data with coarser spatio-temporal resolutions.

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The basic researches on hydroacoustics in Vietnam are very limited, especially in the field of sound propagation simulation, while the world has many researches and positive application in underwater activities and marine fishery. Consequently, there is now a shortage of information to visualize the importance of sound propagation in the sea. In Vietnam, these is a growing need to secure the safety of the equipment, submarine, fishery and systematically arrange the hydroacoustic means in orher to provide and obtain the best hydroacoustic information, as well as to avoid detection of the enemy. The underwater acoustic channel has been indentified off Central Vietnam at 1260 m depth and acoustic speed is 1490 cm/s. This report presents research methods and acoustic simulation models, together with the simulation results that ensure the reliability sound through the underwater acoustic channel.