Numerical Modeling of the Storm Surge of NANAUK and ASHOOBA Tropical Cyclones in the Makran Coasts

Tropical cyclone storm surge is one of the key parameters in the design of coastal structures and shoreline management plans. Therefore, the storm surge of the Nanauk and Ashooba tropical cyclone has been investigated on the Makran coasts. In this study, in addition to the analysis of the global sea level monitoring station data, the effects of boundary conditions and wind field accuracy of reanalysis, parametric and WRF model data have been investigated in storm surge modeling. Analysis of water level observations shows that the maximum storm surge (0.38 and 0.36 m) occurred after the tropical cyclone landfall. Furthermore, the secondary effects of tropical cyclones cause the movement of the water body and storm surge for several days. Considering the Sea Surface Anomaly (SSA) as the open boundary condition has led to improved numerical model results. The storm surge results of the ERA5 and WRF wind field have appropriate accuracy in Makran coasts. The maximum value of storm surge obtained based on ERA5 wind field at Chabahar station in Nanauk and Ashooba tropical cyclone is 0.25 and 0.34 m, respectively.