ESTIMATION OF SEDIMENT ACCUMULATION RATE AT DIFFERENT SEASON IN JURU RIVER AND PERAI RIVER (PERAI INDUSTRIAL AREA, PENANG, MALAYSIA)
Two sediments cores were collected from each Juru River and Perai River at the Penang’s Perai Industrial Area during two different seasons and analyzed using nuclear techniques, with the purpose to evaluate the sediment accumulation rates at the study area. Radioactivities of 137Cs, 210Pb and 226Ra activity profiles were determined for each core by using gamma spectrometry system. However, due to the complexity of the excess 210Pb activity profiles obtained, it was not possible to obtain an age model from them. Nonetheless, preliminary apparent sediment accumulation rates were estimated, and were found to range between 0.94 – 4.91 cm/y and 1.79 – 4.83 cm/y for Juru and Perai River, respectively. As expected, the deposition rates were higher during rainy period where the value at Juru River almost five folds, and at Perai River, it was 2.5 times higher than that of the dry season. The highest sedimentation rate recorded was in the core collected at the Juru River (SP 03) during the rainy season.