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Evaluation of design wind speeds using scale-based classification of high-intensity windstorms

Authors: Ibrahim, Ibrahim;

Evaluation of design wind speeds using scale-based classification of high-intensity windstorms

Abstract

Wind loading is a critical component of design for engineered structures. In particular, the design of spatial structures like electricity transmission line systems and long-span bridges is not only dependent on the statistics of design wind speeds, but also the nature of loading events. The locality of loading events can result in special differential loading cases across multiple spans of the structure that, in many cases, can govern the design. While the statistics of design wind speeds are widely developed and methodological, the locality (scale) of high-intensity wind events has yet to be explored in a generalized manner to be linked to design wind speeds and incorporated into the design of spatial structures. The main challenge with determining the scale of high-intensity wind events is instrumentation. Design wind speeds are historically estimated from anemometer records. Anemometer networks have sufficient temporal resolution to capture peak event velocities but lack the spatial coverage to estimate the scale of high-intensity wind events. Accordingly, the current study aims at estimating the scale of high-intensity wind events by utilizing data from weather radars. Archived radar data have the potential of estimating the scale of wind events, but such task comes with challenges related to temporal and spatial resolution of radar archives, as well as numerical issues related to the retrieval process. The study first explores the retrieval process and how it compares to design wind speeds estimated using anemometer records. After developing a relative degree of confidence in the ability of radar retrievals to estimate design wind speeds, the study proceeds to propose a Machine Learning technique that utilizes radar data to estimate the scale of high-intensity wind events based on 60-min anemometer records. The proposed technique is then applied on contiguous United States and design wind speed statistics are compared for the cases of compiled datasets, and datasets segregated based on scales of events. The results show that for the Northeast coast of the US, or for the case of return periods higher than 100 years anywhere else in contiguous US, events of the smallest classified scale were found to have higher design wind speeds than the compiled dataset. Therefore, smaller scale events need to be considered separately when dealing with spatial structures under the circumstances of high return periods, or Northeast coast of US.

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Keywords

Design Wind Speeds, Machine Learning, Wind Event Scale, Meteorology, Structural Engineering, High-intensity Wind, Radar Retrieval, Spatial Structures, 620

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green