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WANG Yanping, LIU Yongling, MAO Xinyan, CHI Yutao, JIANG Wensheng. Long-term variation of storm surge-associated waves in the Bohai Sea[J]. HaiyangYuHuZhao, 2019, 37(6): 1868-1878

Long-term variation of storm surge-associated waves in the Bohai Sea

WANG Yanping1,2, LIU Yongling1,2, MAO Xinyan1,2, CHI Yutao1,2, JIANG Wensheng1,3
1 Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China;
2 College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;
3 Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao 266100, China
When investigating the long-term variation of wave characteristics as associated with storm surges in the Bohai Sea, the Simulating Waves Nearshore (SWAN) model and ADvanced CIRCulation (ADCIRC) model were coupled to simulate 32 storm surges between 1985 and 2014. This simulation was validated by reproducing three actual wave processes, showing that the simulated significant wave height (SWH) and mean wave period agreed well with the actual measurements. In addition, the long-term variations in SWH, patterns in SWH extremes along the Bohai Sea coast, the 100-year return period SWH extreme distribution, and waves conditional probability distribution were calculated and analyzed. We find that the trend of SWH extremes in most of the coastal stations was negative, among which the largest trend was -0.03 m/a in the western part of Liaodong Bay. From the 100-year return period of the SWH distribution calculated in the Gumbel method, we find that the SWH extremes associated with storm surges decreased gradually from the center of the Bohai Sea to the coast. In addition, the joint probability of wave and surge for the entire Bohai Sea in 100-year return period was determined by the Gumbel logistic method. We therefore, assuming a minimum surge of one meter across the entire Bohai Sea, obtained the spatial SWH distribution. The conclusions of this study are significant for offshore and coastal engineering design.
Key words:    significant wave height (SWH)|storm surge|long-term variation|coupled models|Bohai Sea   
Received: 2018-09-22   Revised: 2019-04-19
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