Browsing by Author "Wijetunge, JJ"

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    Computation of nearshore wave set-up due to wind waves generated by tropical cyclones landfalling in Sri Lanka
    (IEEE, 2016-05) Marasinghe, CK; Wijetunge, JJ; Jayasekara, AGBP; Bandara, HMND; Amarasinghe, YWR
    The hazard to coastal communities from a landfalling tropical cyclone includes high winds causing damage as well as coastal flooding caused by the storm surge. Of the four physical processes that contribute to the total surge, i.e., the wind set-up, the wave set-up, the tide and the barometric effect, this paper is concerned with the contribution from the wave set-up induced by cyclone-generated waves breaking near the shore. Accordingly, a series of numerical experiments have been performed using a spectral wind wave model to examine and quantify the wave-set-up over a range of tropical cyclone wind speeds and at five coastal locations representative of the different coastal sectors of Sri Lanka. The numerical results have also been employed to test the accuracy and reliability of the wave setup estimated from three of the analytical formulae available in the literature.
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    A Deterministic Hazard Assessment for Storm Surge Induced Flooding: A Case Study
    (2015-08-03) Marasinghe, CK; Wijetunge, JJ
    Coastal flooding due to tropical cyclone generated storm surges has caused considerable damage and loss of life in the North Indian Ocean region including in Sri Lanka. This paper is concerned with a deterministic analysis of the storm surge hazard for the city of Chilaw on the west coast of Sri Lanka, as a case study. The present hazard assessment utilizes a database of historical events of tropical cyclones in the North Indian Ocean region. A statistical analysis of the past events has been carried out to identify an appropriate storm surge scenario. Numerical models comprising a parametric cyclone model and a hydrodynamic model based on shallow water equations have been employed to simulate cyclone wind velocity and pressure fields as well as coastal inundation due to the storm surges. The spatial distribution of the depth of inundation as well as maps of the hazard to population and residential buildings in the study area are presented and discussed.