The Effects of Constructing a Barrage across the Tawe Estuary
A proposed barrage across the tidal reaches of the R. Tawe, South Wales, was modelled to simulate its effect on the environment. Both computer and physical models were prepared, tested and run for a variety of tidal and fresh water flow conditions. A comprehensive data review identified further information essential for model calibration and information. Field surveys to gather physical, chemical and biological information were performed as part of the overall study. The numerical models predicted hydrodynamic and pollutant behaviour upstream of the barrage and sedimentation effects downstream. The physical model was used for navigational effects and for identifying problems during the construction phase. The study revealed that conditions would change but not significantly deteriorate provided that certain remedial actions were taken.