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Acta Oceanologica Sinica

, Volume 36, Issue 5, pp 57–66 | Cite as

Prediction of salinity intrusion in the sheltered estuary of Terengganu River in Malaysia using 1-D empirical intrusion model

  • Hin Lee Lee
  • Fredolin Tangang
  • Jacqueline Isabella Gisen
  • Saim Suratman
Article

Abstract

Generally one dimensional (1-D) empirical salinity intrusion model is limited to natural alluvial estuary. However, this study attempts to investigate its ability to model a sheltered alluvial estuary of the Terengganu River in Malaysia. The constructed breakwater at the mouth of the river shelters the estuary from direct influence of the open sea. The salinity density along the estuary was collected during the wet and dry seasons for scenarios before and after the constructed breakwater. Moreover, the freshwater discharges, tidal elevations and bathymetry data were also measured as model inputs. A good fit was demonstrated between simulated and observed variables, namely salinity distribution and intrusion length for both scenarios. Thus, the results show that 1-D empirical salinity model can be utilized for sheltered estuarine condition at the Terengganu Estuary, but with an appropriate determination of an initial point. Furthermore, it was observed that the salinity intrusion in the study area is largely dependent on the freshwater discharge rather than tidal elevation fluctuations. The scale of the salinity intrusion length in the study area is proportional to the river discharge of the–1/2 power. It was appeared that the two lines of the 1-D empirical salinity model and discharge power based equation fitted well to each other, with the average predicted minimum freshwater discharge of 150 m3/s is going to be required to maintain acceptable salinity levels during high water slack (HWS) near the water intake station, which is located at 10.63 km from river mouth.

Key words

salinity intrusion sheltered estuary freshwater discharge geometric characteristic empirical model 

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Notes

Acknowledgements

The authors thank Zelina Zaiton Ibrahim and Mahendran Shitan from UPM for their guidance during the data collection campaign. The authors also thank the members of the Research Centre for Coastal Management, National Hydraulic Research Institute of Malaysia, for their help with the data collection.

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Copyright information

© The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Hin Lee Lee
    • 1
    • 2
  • Fredolin Tangang
    • 1
  • Jacqueline Isabella Gisen
    • 3
  • Saim Suratman
    • 2
  1. 1.Research Centre for Tropical Climate Change, Faculty of Science and TechnologyThe National University of Malaysia, UKMBangiMalaysia
  2. 2.Research Centre for Water Quality and Environment, National Hydraulic Research Institute of MalaysiaMinistry of Natural Resources and EnvironmentSeri KembanganMalaysia
  3. 3.Centre for Earth Resources Research and Management, Faculty of Civil Engineering and Earth ResourcesThe Universiti Malaysia PahangPahangMalaysia

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