Observations Of Nutrient Release Into
Semi-enclosed Macrotidal Lagoons
Author(s)
S.B. Mitchell
Abstract
Sections of the densely populated southern and eastern English coasts are
characterised by a sequence of semi-enclosed macrotidal lagoons. Periodic
release of nutrients (nitrate/phosphate) from sewage treatment plants and
agriculture into these areas has caused concern to environmental managers in
terms of possible eutrophication problems and excessive growth of macrophytic
algae (enteromorpha/ ulva). It is therefore important to investigate the patterns of
distribution of nutrients within these lagoons in order that this effect may be
better predicted and mitigation measures undertaken. Results of nitrate and
phosphate concentrations are shown, measured both over individual tidal cycles
and over longer term deployments at Pagham Harbour, West Sussex, UK, a site
of great importance as a nature reserve and a home for several rare species of
plants and animals. In particular, the effects of fresh water-
Keywords
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