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Sediment dynamics in Rangoon river, Myanmar.

B W Nelson1

  • 1Department of Environmental Sciences, University of Virginia, Charlottesville 22903, USA. bwn@virginia.edu

The Science of the Total Environment
|March 22, 2001
PubMed
Summary
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Seasonal changes in freshwater flow and tides significantly impact Rangoon River

Area of Science:

  • Environmental Science
  • Oceanography
  • Sedimentology

Background:

  • Rangoon River experiences significant seasonal variations in freshwater discharge and tidal amplitudes (2-5 m).
  • Fine-grained sediment transport is a critical factor in estuarine dynamics.

Purpose of the Study:

  • To investigate the influence of seasonal variations on fine-grained sediment behavior in the Rangoon River.
  • To understand the mechanisms of sediment transport driven by freshwater discharge and tidal influences.

Main Methods:

  • Analysis of sediment concentrations under varying freshwater discharge and tidal conditions.
  • Observation of sediment layering and fluid mud formation.
  • Measurement of current speeds and salinity.

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Main Results:

  • Monsoon season: Low sediment concentrations (<1 g/l) result in seaward flow.
  • Dry season: High salinity (20%) and sediment concentrations (up to 6 g/l) lead to landward sediment advection.
  • Tidal effects: Neap tides show low near-surface concentrations and 'fluid mud' layers; high current speeds (>0.6 m/s) prevent 'fluid mud' formation and increase water column sediment load (6-8 g/l).
  • Layered suspensions form during decelerating tides and disperse with accelerating flow.

Conclusions:

  • Seasonal variations in riverine and tidal forces are key drivers of fine-grained sediment dynamics in the Rangoon River.
  • The interplay between freshwater discharge, salinity, and tidal currents dictates sediment transport patterns, including landward and seaward advection and the formation of distinct sediment layers.
  • Understanding these processes is crucial for managing estuarine environments and coastal sedimentation.