In this study, the WRF (Weather Research and Forecasting) model was used to simulate and investigate diurnal and annual variations of wind speed and wind power density over Southern Vietnam at 2‐km horizontal resolution for two years (2016 and 2017). The model initial and boundary conditions are from the National Centers for Environmental Prediction (NCEP) Final Analyses (FNL). Observation data for two years at 20 m height at Bac Lieu station were used for model bias correction and investigating diurnal and annual variation of wind speeds. The results show that the WRF model overestimates wind speeds. After bias correction, the model reasonably well simulates wind speeds over the research area. Wind speed and wind power density show much higher values at levels of 50–200 m above ground levels than near ground (20 m) level and significantly higher near the coastal regions than inland. Wind speed has significant annual and diurnal cycles. Both annual and diurnal cycles of wind speeds were well simulated by the model. Wind speed is much stronger during daytime than at nighttime. Low-level wind speed reaches the maximum at about 14 LT to 15 LT when the vertical momentum mixing is highly active. Wind speeds over the eastern coastal region of Southern Vietnam are much stronger in winter than in summer due to two main reasons, including (1) stronger large-scale wind speed in winter than in summer and (2) funnel effect creating a local maximum wind speed over the nearshore ocean which then transports high-momentum air inland in winter.

中文翻译：

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巴克列乌地区风速和风功率密度的观测与模拟

在这项研究中，WRF（天气研究和预报）模型用于模拟和研究越南南部2公里水平分辨率的风速和风能密度在两年内（2016年和2017年）的日变化和年变化。模型的初始条件和边界条件来自国家环境预测中心（NCEP）的最终分析（FNL）。使用Bac Lieu站高度为20 m的两年的观测数据进行模型偏差校正，并调查风速的日变化和年变化。结果表明，WRF模型高估了风速。经过偏差校正后，该模型可以很好地模拟研究区域内的风速。在高于地面的50-200 m处，风速和风能密度的值要比接近地面（20 m）的值高得多，而在沿海地区则要比内陆的要高得多。风速具有重要的年度和昼夜周期。该模型很好地模拟了风速的年循环和日循环。与白天相比，白天的风速要强得多。当垂直动量混合非常活跃时，低水平风速达到最大值（约14 LT至15 LT）。越南南部东部沿海地区的风速冬季要比夏季强得多，主要有两个原因，其中包括：（1）冬季的大型风速要比夏季强；（2）漏斗效应产生了局部最大风速加快近海的航行速度，然后在冬季将高动量的空气输送到内陆。