著者

Van Q. Doan Van Nguyen Dinh Hiroyuki Kusaka Thanh Cong Ansar Khan Du Van Toan Nguyen Dinh Duc

出版者

Meteorological Society of Japan

雑誌

SOLA (ISSN:13496476)

巻号頁・発行日

vol.15, pp.113-118, 2019 (Released:2019-05-30)

参考文献数

32

被引用文献数

5

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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 multiple-scale 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 wind-power assessment as compared to other reanalysis or QuikSCAT data with coarser spatio-temporal resolutions.

著者

Le Thi Viet HOA Shigeko HARUYAMA Nguyen Huu NHAN Tran Thanh CONG Bui Duc LONG

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:13479555)

巻号頁・発行日

vol.80, no.12, pp.663-680, 2007-10-01 (Released:2010-03-12)

参考文献数

25

被引用文献数

6 13 1

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The Mekong River Delta is one of the world's largest deltas and plays an important role in Vietnam's economic development. Studies of flood propagation over the whole delta have been rare. In 2000, due to global climate change and La Niña phenomenon, the hydrological and meteorological situations were very complicated around the world in general, and in the Mekong River basin in particular. In Mekong Delta, flood occurred early and had two peaks in which the second peak was one of the highest in the past 80 years. This flood caused water levels in the upstream Mekong River basin to become about 1 to 3m higher than the third warning level, and caused extremely severe inundation downstream. In Vietnam, this flood caused damage totaling about 5, 000 billion VN dong (about 4 million US dollars at that time), and its level was used to consider the design elevation of flood control embankments. Thus, through study of this flood is necessary to mitigate flood damage and human suffering and to contribute to policy making and create the conditions for embankment elevation design.In this paper, analysis of the main characteristics of the flood of 2000 was carried out based on the observed data since 1926. Also, simulations were conducted using hydraulic models with topographical, hydrological and meteorological data. The flood simulations using hydraulic model for Vietnamese part of delta were carried out, especially for Dong Thap Muoi and Long Xuyen quadrant to analyze (1) how the flood was distributed spatially and temporally, (2) how long each inundation depth lasted, (3) the extent of the area of the flood, and (4) the effect of flood on paddy fields in 2000. The observed data and simulated results show that this flood was extremely large and complicated, causing severe inundation with the depth of 2.5m lasting more than one month from mid-September to mid-October. Flood in August affected strongly the summer-autumn crop paddy field. The area inundated to the depth of 2.5m was more than one thousand km2.