Variabilities in Johor river discharge

Abstract

River discharge is the volume of water which flows through a river channel within a specific time. Discharges are normally used by the hydrologist in order to measure variability of a flow. The aim of this study is to compare the variability of different period of hydrological time series discharge among the eight rivers in the State of Johor. We also aim to identify the high and low variabilities of river discharge using Wavelet Analysis. Our main data source is the daily river discharge series from 1st January 1980 to 31st December 2008 for eight gauging stations in Sungai Johor, Sungai Sayong, Sungai Lenik, Sungai Bekok, Sungai Kahang, Sungai Lenggor, Sungai Muar and Sungai Segamat. The results show that the variability exist in this study as we compared the daily data between the years through time series plot. The temporal variability is determined using different period of hydrological time series i.e. daily and half month. We also demonstrated Wavelet Analysis using half month data for Sungai Sayong and Sungai Muar. Finally, we identified the high and low variabilities for the eight rivers in Johor. The result obtained shows that high variabilities occur in shorter period compared to low variabilities.