Long-term uncertainty quantification in WRF-modeled offshore wind resource off the US Atlantic coast

IF 3.6 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Wind Energy Science Pub Date : 2023-04-28 DOI:10.5194/wes-8-607-2023
Nicola Bodini, Simon Castagneri, M. Optis
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Abstract

Abstract. Uncertainty quantification of long-term modeled wind speed is essential to ensure stakeholders can best leverage wind resource numerical data sets. Offshore, this need is even stronger given the limited availability of observations of wind speed at heights relevant for wind energy purposes and the resulting heavier relative weight of numerical data sets for wind energy planning and operational projects. In this analysis, we consider the National Renewable Energy Laboratory's 21-year updated numerical offshore data set for the US East Coast and provide a methodological framework to leverage both floating lidar and near-surface buoy observations in the region to quantify uncertainty in the modeled hub-height wind resource. We first show how using a numerical ensemble to quantify the uncertainty in modeled wind speed is insufficient to fully capture the model deviation from real-world observations. Next, we train and validate a random forest to vertically extrapolate near-surface wind speed to hub height using the available short-term lidar data sets in the region. We then apply this model to vertically extrapolate the long-term near-surface buoy wind speed observations to hub height so that they can be directly compared to the long-term numerical data set. We find that the mean 21-year uncertainty in 140 m hourly average wind speed is slightly lower than 3 m s−1 (roughly 30 % of the mean observed wind speed) across the considered region. Atmospheric stability is strictly connected to the modeled wind speed uncertainty, with stable conditions associated with an uncertainty which is, on average, about 20 % larger than the overall mean uncertainty.
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WRF模拟的美国大西洋沿岸海上风电资源的长期不确定性量化
摘要长期建模风速的不确定性量化对于确保利益相关者能够最好地利用风资源数值数据集至关重要。在海上,考虑到与风能目的相关的高度风速观测的可用性有限,以及由此产生的风能规划和运营项目的数值数据集的相对权重更大,这种需求更加强烈。在这项分析中,我们考虑了美国国家可再生能源实验室21年来更新的美国东海岸海上数值数据集,并提供了一个方法框架,以利用该地区的浮动激光雷达和近表面浮标观测来量化建模的枢纽高度风资源的不确定性。我们首先展示了使用数值系综来量化建模风速的不确定性不足以完全捕捉模型与真实世界观测的偏差。接下来,我们训练并验证一个随机森林,使用该地区可用的短期激光雷达数据集,将近地表风速垂直外推到轮毂高度。然后,我们应用该模型将长期近水面浮标风速观测值垂直外推到轮毂高度,以便可以直接将其与长期数值数据集进行比较。我们发现,在140 m小时平均风速略低于3 m s−1(大约30 % 平均观测风速)。大气稳定性与建模的风速不确定性严格相关,稳定条件与平均约20的不确定性相关 % 大于总体平均不确定性。
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来源期刊
Wind Energy Science
Wind Energy Science GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY-
CiteScore
6.90
自引率
27.50%
发文量
115
审稿时长
28 weeks
期刊最新文献
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