Long-Term Variation of the Wave Power Density in the South China Sea Over the Past 28 Years

Shaobo Yang,Lintong Xi,Xingfei Li,Chongwei Zheng,Hongyu Li,Zegui Deng,Chao Zhan,Jucheng Zhuang

doi:10.1109/access.2020.2982853

Abstract

Based on 28 years of hindcast data, this paper describes in detail the long-term variation trend of wave power density in the South China Sea. WAVEWATCH-III (WW3), the third generation wave computing model, which plays an important role in wave prediction. WW3 was used for inverse calculation of wave parameters, with spatial resolution of $0.25^{\circ }\times 0.25^{\circ }$ and time resolution of 6h. The validity of the data was verified by three typhoon processes and the significant wave height data of the satellite altimeter in 2010. According to 28-year(1990–2017) hindcast data set, the author respectively mapped the South China Sea mean monthly, seasonal, annual wave power density (WPD) and the change trend diagram, including the long-term trend of WPD Mann-Kendall (MK) test, come the following conclusions: (1) Influencing the area WPD change trend of the dominant increasing season is winter (DJF), in which season average growth of WPD is about 1kW/m, and the largest waters is closed to 3kW/m. (2)The dominant growing month for WPD is in December, by compared with the before and next month in the largest growing sea area, it shows an increase and decrease trend of 10kW/m and 20kW/m respectively. (3)MK test results indicate that the long-term change of WPD keep on an increasing trend, but it is not significant, among which WPD had an increased mutation in 2000. (4)The dominant sea area is around Luzon Strait-Taiwan Strait- D.S Islands (116°E, 21°N). The average growth of WPD among these area in 28 years are about 0.15–0.25(kW/m)/yr.

Highlights

Sustainable development of human beings in the Marine environment requires long-term data with ocean parameters such as waves
THE DISCUSSION FOR THE DOMINANT SEASONS AND REGION ABOUT wave power density (WPD) CHANGE TREND IN THE SOUTH CHINA SEA According to the monthly WPD distribution in 28 years (Fig.4) and long-term seasonal distribution of WPD change trend (Fig.7), it was noticeable that winter (DJF) is the season with the largest WPD distribution and the most significant growth change among the four seasons
It is believed that the dominant sea area of long-term wave power density in the South China Sea is located between the D.S Islands of China, the Luzon Strait and the Taiwan Strait of China

Summary

Introduction

Sustainable development of human beings in the Marine environment requires long-term data with ocean parameters such as waves. Effective long-term coastal and offshore wind, wave data of Marine have important reference meaning for engineering application and management, such as design and. The associate editor coordinating the review of this manuscript and approving it for publication was Shuaihu Li. construction in coastal area, protection and management of the harbor, Marine engineering planning and implementation of tourism development in the coastal area and offshore islands, coastal neighborhoods affordability assessment and risk analysis of the disaster, and the wind and wave energy utilization feasibility analysis. S. Yang et al.: Long-Term Variation of the Wave Power Density in the South China Sea Over the Past 28 Years ocean engineering effectively. Based on the previous summary methods, WW3, which is one of the most widely used numerical models in the world and as the third generation numerical model, is selected in this paper to compute hindcast wave parameters

Discussion

Conclusion