This paper studied the tsunami risk of Qidong County, China. By analyzing the historical earthquake and tsunami data, the potential tsunami sources and parameters that may affect Qidong County are determined, including 8 regional tsunami sources and 14 long-distance tsunamis. The numerical calculation of potential tsunami sources were carried out by using COMCOT model. This model can simulate the whole process of tsunami wave, including tsunami generation, propagation and inundation. Okada model is used to generate tsunami wave. According to the calculation results, the tsunami inundation is analyzed. Tsunami risk is determined according to the relationship between tsunami hazard, vulnerability and risk. In this paper, the effects of wave amplitude and wave current on nearshore are analyzed. From the analysis results, when a major tsunami occurs, the coast of Qidong County will be affected by the potential tsunami disaster. When the river gate is open, the tsunami inundation occurs. The tsunami sources that can cause tsunami disaster on Qidong County mainly come from Guam, Ogasawara, the Nankai Trough and Philippine Trench scenarios. The assessment results can provide scientific reference for local tsunami disaster prevention and reduction. It is suggested that the government should formulate a special emergency plan for tsunami disaster, build disaster shelters in the inundated areas and plan evacuation routes.
Tsunami disaster is one of the most serious marine disasters in the world. Many coastal countries around the world have suffered tsunami disaster. After the Indian Ocean tsunami in 2004, governments and international organizations all over the world have promoted tsunami disaster prevention and reduction research. As an important part, tsunami risk assessment is regarded as the primary task of tsunami disaster prevention and mitigation (Wang and Liu, 2006; Ioualen et al., 2007).
Since the beginning of the 21st century, the global earthquakes have been active, and major tsunami disasters have shown a high incidence (Hou et al., 2020). A magnitude 9.0 Earthquake in eastern Japan in 2011 triggered a huge tsunami, resulting in the death of more than 27000 people in Japan (Wei et al., 2013). The impact of the nuclear accident caused by the tsunami on the marine environment is immeasurable. This tsunami event had a certain impact on China's coastal areas such as Zhejiang and Fujian province. According to the records and analysis of the ocean observation network, the tsunami caused maximum tsunami amplitude of 10-60 cm along the coasts of Jiangsu, Zhejiang, Fujian provinces. Several scholars have studied the tsunami risk around China (Liu et al., 2007; Hou et al. 2020; Sun et al., 2013; Zhao et al., 2013; Li et al., 2016).
