Surge and coastal inundation study of September 2014 storm in Giresun, Black Sea

2016
Aydın, Deniz Can
In Turkey, due to the fact that the Black Sea coast is vulnerable to storms and coastal hazards, further comprehensive studies for storm surge and consequent coastal inundation are necessary. The aim of this study is to investigate wave formation under storm conditions and analyze coastal flooding in Giresun during the storm event occurred between 23-26 September 2014. For this purpose numerical studies are carried out in two phases. In phase 1, coupled ADCIRC+SWAN model is used for examining wave generation and in phase 2, wave parameters obtained from these runs are used to investigate coastal flooding. In phase 1, sensitivity of the coupled model is investigated by altering the shared information among circulation and wave models. It is observed that preventing water elevation and current information passing from ADCIRC to SWAN leads to decreased wave heights and among them, current information is found to be more effective. Moreover disregarding wave effects result in negligible difference in water elevations which is attributed to relatively low wind speeds. At Giresun cape, significant wave heights obtained from ADCIRC+SWAN simulations range between 4.5m and 7.5m with peak periods around 11.25s. In phase 2, shallow water numerical model NAMI-DANCE is used. Coastal inundation and flow depths are computed for three selected wave heights. Maximum inundated area is computed to be close to 0.095km2. Major inundation is computed at Giresun cape, its west and east, and also at the breakwater and harbor. The results are compared with observations and fairly well agreement is obtained. 
Citation Formats
D. C. Aydın, “Surge and coastal inundation study of September 2014 storm in Giresun, Black Sea,” M.S. - Master of Science, Middle East Technical University, 2016.