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Historically the Bohai Sea has not only been affected by tropical cyclones but also by extratropical cyclones and cold air, hence, the storm surges that have occurred have frequently caused severe damage (Zhao and Jiang, 2011 Feng et al., 2012a Ding and Wei, 2016).

1), which is China’s northernmost sea, covers an area of about 77 thousand km 2, is surrounded by land on three sides, and connects to the Yellow Sea through the Bohai Strait. As a coastal country, China has been endangered by storm surges for many years. Their energy is palpably destructive in coastal regions, resulting in destructive of infrastructure and great economic loss (Storch et al., 2008 Kang et al., 2016). Storm surges are anomalous rises and falls in water level caused by strong atmospheric disturbances (Feng, 1982). By establishing a system to assess the relative risks of storm surges in the Bohai Sea, it is found that Laizhou Bay is in the greatest danger. The results show that the effect of waves in surge-wave joint probabilities on the central basin of the Bohai Sea is more significant than that on the Bohai Sea coast. Moreover, the joint probabilities of surge and wave are obtained by using the Gumbel logistical model. It is found that extratropical cyclones and cold air play important roles in storm surges in the Laizhou Bay and have more influence than tropical cyclones. The return storm surge elevation in the Bohai Sea using the Gumbel method is obtained and compared with previous results. In this study, an unstructured grid wave-current coupled model was developed for the Bohai Sea, China, using the ADCIRC (ADvanced CIRCulation) and SWAN (Simulating WAves Nearshore) models to simulate 32 disastrous storm surge events from 1985 to 2014. Destructive storm surges bring large waves and unusually high surges of water to coastal areas, resulting in many human casualties and significant economic loss.

The probability of joe passing his drivers test is 0.2