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Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation

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Spatial and temporal variations of sedimentation rate in the Timah Tasoh Water Reservoir, Perlis, Malaysia

Zullyadini Rahaman
  • HydroGeomorphology Research Group, Universiti Sains Malaysia
/ Wan Ismail
  • HydroGeomorphology Research Group, Universiti Sains Malaysia
Published Online: 2010-07-14 | DOI: https://doi.org/10.2478/v10060-008-0071-9

Spatial and temporal variations of sedimentation rate in the Timah Tasoh Water Reservoir, Perlis, Malaysia

Human activities such as logging, land conservation, road construction and other disturbances in watersheds will increase erosion rate and thus the amount of sediment transported into the river that reaches lakes, reservoirs and sea. Accelerated sedimentation rate in the reservoir can significantly reduce a reservoir's surface area, eliminating wetland area surrounding the reservoir and shallow the areas near the shore of the reservoir. A study of sedimentation rate in the Timah Tasoh water reservoir was carried out from May 2001 to April 2002 by means of sediment traps. The aim of this study is to determine the spatial and temporal pattern of sedimentation rates in the reservoir. The sediment traps were installed at five different locations in the reservoir and replaced every month. Gross sedimentation rates measured in the sediment traps vary from about an average of 1.4 kg/m2/month or 16.3 kg/m2/yr in the deepest part of the reservoir to about 79.2 kg/m2/yr (monthly average of 6.6 kg/m2/month) and 47.1 kg/m2/yr (monthly average of 3.9 kg/m2/month) near the inlet of the Pelarit River and the Tasoh River respectively. The sedimentation rate near the Pelarit River and the Tasoh River inflow is correlated with the water and suspended sediment discharge in the river, owing to its proximity to the rivers and the flooding effect, mainly during the wet season. The sedimentation rate decreases southward along the reservoir, as a result of increasing distance from the river mouth. The total suspended sediment load of the Upper Pelarit River and the Jarum River flowing into the reservoir is 11.4 × 103 ton/year and 5.41 × 103 ton//year respectively.

Analiza przestrzenna i czasowa zmienności ilości sedymentu w zbiorniku Timah Tasoh, Perlis w Malezji

Na podstawie szczegółowych łapaczkowych pomiarów terenowych przedstawiono zmiany przestrzenne i czasowe (2001-2002) ilości sedymentu w zbiorniku wodnym Timah Tasoh w Malezji. Łapaczki umieszczone w pięciu punktach zbiornika opróżniano co 5 miesięcy. Zmiany ilości sedymentu wykazano liczbowo na tle ilości dostarczanego rumowiska do zbiornika z rzek Pelarit oraz Jarum.

Keywords: reservoir sedimentation; sediment trap; sediment discharge; Timah Tasoh; Perlis

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About the article

Published Online: 2010-07-14

Published in Print: 2010-01-01

Citation Information: Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation, ISSN (Online) 2081-9617, ISSN (Print) 1898-8857, DOI: https://doi.org/10.2478/v10060-008-0071-9. Export Citation

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