Author(s)

D.S. Speers, P.A. Mackinnon, D.M. Moore & J.R. MacDonald

Abstract

Measurements of dissolved oxygen in an impounded stratified estuary D. S. Speers', P.A. Mackinnon', D.M. Moore^ & J.R. MacDonald* ^School of Civil Engineering, The Queen's University of Belfast, Northern Ireland. r^ ^^ White Young Green pic., Belfast, Northern Ireland ^ Laganside Corporation, Belfast, Northern Ireland Abstract Like many impounded stratified estuaries, the Lagan (in Belfast, Northern Ireland) suffers water quality problems from time to time. These problems date back to 1937, when the first weir was constructed to allow navigation within the estuary. With the replacement of the original weir in 1994 by the Lagan Weir, a half tide-barrage, water quality issues were addressed. Provision was made for flushing of saline water that would otherwise become trapped at the base of the barrage, and artificial aeration facilities were installed with the intention of improving dissolved oxygen in the upper reaches. Despite these measures, the semi-tidal natu

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