Effect of translate speed of typhoon on wind waves
- PDF / 2,596,540 Bytes
- 18 Pages / 439.37 x 666.142 pts Page_size
- 17 Downloads / 201 Views
Effect of translate speed of typhoon on wind waves Naoto Inagaki1 · Tomoya Shibayama1 · Miguel Esteban1 · Tomoyuki Takabatake1 Received: 9 April 2020 / Accepted: 21 September 2020 © Springer Nature B.V. 2020
Abstract Quantitative assessments on the effect of translate speed of typhoons on wind waves were carried out. A WRF-SWAN coupled model that used observed meteorological data was applied to eight different typhoons in the vicinity of Shiono-Misaki, on the pacific side of Honshu Island, Japan. The authors proposed a new methodology to modify the translate speed and wind field of tropical cyclones using an empirical model in which the gross wind speed is expressed as the summation of two different types of wind generation. Two different trends of the relationship between the significant wave height ( Hs ) and translate speed ( V ) were found, describing the most dominant parameter. Typhoons with a modest intensity and size (for the case of Japan) generally showed a positive correlation between the change in the maximum Hs and V , which means translation wind speed was the dominant parameter. In contrast, stronger typhoons were less sensitive to the change in V and could maintain high waves even when almost stationary. With reference to the results, it is important to raise awareness of the future problems that could be caused by large storms that stall for prolonged periods of time. Keywords WRF · SWAN · Slow-moving tropical cyclones · Wind waves · Prolonged hazards
* Naoto Inagaki [email protected] Tomoya Shibayama [email protected] Miguel Esteban [email protected] Tomoyuki Takabatake [email protected] 1
Department of Civil and Environmental Engineering, Waseda University, 3‑4‑1, Okubo, Shinjuku‑ku, Tokyo 169‑8555, Japan
13
Vol.:(0123456789)
Natural Hazards
1 Introduction It has been hypothesized that climate change might in the future change the intensity and patterns of tropical cyclones (TCs) worldwide (e.g., Emanuel 2013; Knutson and Tuleya 2004; Knutson et al. 2010), with some researchers claiming to have evidence that such changes have already started to be felt. Statistical analysis of past TC intensity by Kossin (2018a, b) indicates that their translate speed, V , has slowed down globally by 10% between 1949 and 2016. Numerical research conducted by Yamaguchi et al. (2020) suggests that the V of typhoons in the vicinity of Japan could decrease on average by 10% under future climate based on the RCP 8.5 scenario. According to such work, the Japanese archipelago would be under the influence of TCs for a longer time than at present, and hence, such changes in V could result in more extreme future disasters (e.g., Kossin 2018a, b; Wang et al. 2018; Emanuel 2017; van Oldenborgh et al. 2017). In fact, slowmoving large TCs have recently caused devastating damage to coastal communities. Hurricane Harvey, which struck the USA in 2018, stalled near the Texas coastline for four days, exposing it to prolonged heavy rainfall, storm surges, and local tornadoes, w
Data Loading...
