Flood frequency analysis of tidal data at Pelabuhan Klang, Malaysia

Abstract

Flooding will continue being an issue as long as there are group of peoples who stays nearby the shore line area with high risk factor. Thus, flood frequency analysis at this location should always be updated from time to time. This study focuses on analysis at Pelabuhan Klang area. This port is one of the most important port located in Peninsular Malaysia. It is greatly functional and there are many active activities going on there such as transferring goods between one ship to another, port throughput and the port infrastructure. This study attempts to determine magnitude of high tide at selected return period at Pelabuhan Klang. There are several distributions namely Weibull, Gumbel, Generalized Extreme Value, Generalized Pareto and Lognormal with 3 parameters. L-moment method is selected to determine estimation of parameter due to its robustness to outliers and is most commonly applied in hydrology. Based on the analysis, all five distribution is significant, however, Weibull distribution is most fitted to the annual maximum data of high tide at Pelabuhan Klang. The analysis shows that magnitude at return period of 5-, 10-, 20-, 50- and 100-years are 5.54, 5.60, 5.65, 5.71 and 5.75 m respectively. It is important to conduct the flood frequency analysis and keep it updated from time to time to prevent the occurrence of tidal flooding and reduce the impacts especially for those who lives nearby the shoreline.