What is it about?
Winds blowing over the ocean generate waves that grow with time. Until they reach a significant height, where they a part of the highest 1/3 of the waves, there is a noticeable time delay between waves and winds that generated them. In this work, we take advantage of this time delay to model a neural network that can predict, by running a time series backwards, the wind speed that generated significant wave height. We compare the method to other wind speed estimation techniques and try filling the gap in wind speed generated by a storm in Placenta Bay, Newfoundland and Labrador, Canada.
Photo by Girma Nigusse on Unsplash
Why is it important?
Wind speed estimation from significant wave height has been studied for decades, and have been used in hindcasting studies and remote sensing applications. The proposed method achieved a high level of correlation between true and estimated wind speeds if compared to other estimation techniques, as well as a good correlation with other local wind speed measurements when trying to estimate wind speeds within a measurement gap during a storm. This shows that the proposed method is robust enough to estimate wind speeds in both high and low sea states.
Read the Original
This page is a summary of: An Improved Estimation and Gap-Filling Technique for Sea Surface Wind Speeds Using NARX Neural Networks, Journal of Atmospheric and Oceanic Technology, July 2018, American Meteorological Society, DOI: 10.1175/jtech-d-18-0001.1.
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