Numerical Simulation of Kyarr Tropical Cyclone Waves in Makran Coastlines

Kyarr Tropical Cyclone was formed on October 2019 in the Arabian Sea and affected Makran coastlines in Oman Sea. Some small rock armored breakwaters were damaged consequently though they were designed to withstand similar cyclones. The aim of the present study is to numerically simulate Kyarr cyclone and investigate the characteristics of the induced waves on Makran coastlines. The design assumptions are then compared to the simulation results. 

 In this simulation, DHI-MIKE software has been used and the Persian Gulf, Oman Sea and some parts of the Arabian Sea up to the five-degree north line are modeled. The two-dimensional wind and pressure field are reproduced to simulate storm conditions based on parametric models.

According to the simulation results, waves with characteristic heights of up to 3 meters and peak periods of up to 16 seconds are formed near ports in shallow areas of Makran coastlines, which led to damage to some of small rock armored breakwaters. 

Kyarr cyclone simulation results show that the induced waves near ports in shallow areas of Makran coastlines had significant heights consistent with the assumptions used in the design of coastal breakwaters but in terms of wave length, longer periods were observed which led to increased run-up, overtopping and consequent damage to the rock armored structures.