USE OF &lt;sup&gt;137&lt;/sup&gt;CS ACTIVITY TO INVESTIGATE SEDIMENT MOVEMENT AND TRANSPORT MODELING IN RIVER COASTAL ENVIRONMENT

Marjorie Marjorie

doi:10.3844/ajessp.2012.417.423

Abstract

Conflicts between human and environment always triggered to sedimentation and erosion problems within the coastal areas, Therefore understanding sediment transport processes in a river estuary and coastal waters was important when studying sediment transport and mobility within the river coastal environment. This article aims to investigate the sediment transport and mobility of the Kemaman River estuary, Terengganu Malaysia. In this article, it was demonstrated that anthropogenic activities within a watershed, such as agriculture and urbanization affected the sediment yield from the watershed. Over four months observation (November 2008-February 2009), the delivery of suspended sediment from the Kemaman River to the Kemaman Estuary had increased by about 25%. Based on the in-situ measurement of 137Cs activity, the measure activity ranged between 5638-22421 cpm for backshore while for foreshore was between 2655-13354 cpm. The mean values for backshore and foreshore were 15153 and 6261 cpm respectively with suspended sediment concentration, recorded from 17 November to 10 February was between 110.5-218.8 mg L-1. Using flow and suspended sediment discharge data provided by the Drainage and Irrigation Department (DID) revealed were possible increasing trend in suspended sediment discharge and concentration, particularly during the monsoon season. Temporal analysis indicates that the trend of sediment yield was increased during the monsoon season resulting over sediment supply adjacent to the river mouth and causing difficulty for fisherman to navigate the boats. In a broader context, this study can underscores the need to address the anthropogenic impacts and flood monsoon on sediment yield in the Kemaman-Chendor estuary system.

Highlights

Understanding sediment transport processes in a river estuary and coastal waters is important when studying sediment transport and mobility within the river coastal environment
The pattern shows higher 137Cs activity in the backshore zone compared with foreshore
It is believed to happen due to 137Cs is strongly adsorbed on fine sands and silts

Summary

Introduction

Understanding sediment transport processes in a river estuary and coastal waters is important when studying sediment transport and mobility within the river coastal environment. Sediment mobility and its subsequent coastal erosion across the river estuary is one of a major concern around the world (He and Walling, 1996; Kamarudin et al 2009; Toriman et al 2009). It is well documented that most of the sediment sources are transported from the river itself and waves actioned through the seabed, beach and cliff erosions (Komar, 1998; Nielsen, 1992). The volumes of sediment yields from rivers are varied from 541, 000 t/km2/y (Yangtse River), 120, 000 t/km2/y (Mississippi River) to 92, 000 t/km2/y (Kelantan River) Both sources generally provide sufficient sediment supply to develop a beach profile along the coastal shoreline. How do the sediment mobilized, where the sediment goes and how far the sediment travels are of the interesting subjects focused among the hydrogeomorphologists, geologists and oceanographers

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Conclusion