Assessments of sedimentation problem for river catchment management in Terengganu River, Malaysia

Noorjima, Abd Wahab and Mohd Khairul Amri, Kamarudin and Hafizan, Juahir and Roslan, Umar and Azizah, Endut (2016) Assessments of sedimentation problem for river catchment management in Terengganu River, Malaysia. In: Challenges in Environmental Science & Engineering, 06-10 Nov 2016, Kaohsiung, Taiwan.

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Abstract

Terengganu River experienced deterioration in water quality, resulting from the sedimentation, anthropogenic, geomorphology problems and unsustainable development management around the river basin. This study was implemented to prove the sedimentation problem especially the formation of total suspended solid (TSS) and the bed sediment grains size in this areas. The technique of analysis of primary data obtained which determine according with the procedure of Gerald & Kenneth and the phi (ϕ) value in this study using the scale Udden - Wentworth which included median, mean, standard deviation, skewness, and kurtosis. As a result, the highest TSS up to 67.2 mg/L (Wet Season) and 128.2 mg/L (Dry Season) which is categorized under the class II and class III respectively, based on the National Water Quality Standard (NWQS). The size of sediment falls between phi -0.1 to phi -1.0 which classified as rough and very rough especially around the stations which near the sand mining area activities. This study also presented the application of selected chemometric techniques such as Agglomerative Hierarchical Clustering (AHC). The AHC enabled to group 19 monitoring sites into a few groups of sedimentation problem factors (industry and urban socioeconomic, sand mining activities, agricultural activity and urban/domestic sewage). For overall, the contributors of sedimentation problems are from unsustainable land use such as sand mining activities which effectively trapping the bed sediments, backflow that carries out high sediments, as well as sedimentation produced due to the river bank erosion.

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