SunLive – Dovi: impact of severe wind damage studied

On the weekend of February 13, former Tropical Cyclone Dovi swept across New Zealand from west to east, leaving a wake of severe damage

Most of the damage was caused by extreme wind speeds in parts of the North Island.

Gusts reached up to 130 km/h in Marlborough and 120 km/h in Taranaki, Wellington and Waikato.

“Nevertheless, rainfall totals during the storm’s most intense 24 hours reached 121mm at Wellington Airport, 99mm at Ngawi and 92mm at Kaikoura and Farewell Spit,” a spokesman for the agency said. team CLIMsystems, an organization that published a detailed blog on the impact of ex-tropical cyclone Dovi and the risks associated with possible future extreme weather events.

“The extreme weather event had a significant social and economic impact. In some cases, this event forced people to leave their homes while damaged trees were felled, leaving a significant financial burden that insurance did not cover. “

The CLIMsystems team says tree failure can cause a range of unforeseen problems by damaging water, transport and electrical infrastructure.

“Ambiguous regulation tree can also create significant confusion when assessing liability. Examples of major infrastructure that have been disrupted include power line outages that left approximately 50,000 people without power and the cancellation of at least 100 Air New Zealand flights.

“In the City of Hamilton, the cost of cleaning up fallen trees and streetlights, with over 700 calls and 1,500 service requests, was estimated to be over $1 million.”

Scientific and social information is evaluated by CLIMsystems from various sources to elucidate the extent of the storm’s impact.

“The historical evolution of wind gusts is analyzed from the 1980s to 2021, which revealed an increasing signal of gusts over 70 km/h.

“Real-time satellite imagery and wind gust speeds of former Tropical Cyclone Dovi were also assessed, displaying the dispersion of Dovi as its tailwinds hit New Zealand.

“Finally, future models of extreme wind speeds are provided for the Waikato, Auckland and Wellington regions up to 2090 using the latest CMIP6 data.”

According to CLIMsystems, the results highlight the random nature of extreme winds and, therefore, the value of making more careful adaptation decisions based on the worst-case scenario.

“These extreme weather events are expected to increase in frequency and intensity with climate change. The implementation of effective mitigation and adaptation strategies is essential to reduce the social, economic and environmental impact. These strategies should lead to a tangible climate action that can mitigate the economic cost, physical destruction and social disruption of these events.”

CLIMsystems’ comprehensive blog highlights the importance of risk management, adopting mitigation measures such as planting appropriate native trees for carbon sequestration and adaptation measures such as using construction materials. resilient construction and the removal of potential hazards.

The blog is available at:—-impacts-and-possible-future-cyclone-related-risks -4-4-2022

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