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Surf zone water quality in liverpool bay england



Surf zone water quality in liverpool bay england



Estuarine and Coastal Marine Science 4(4): 427-442



The results of a continuous investigation into seasonal and long term changes in surf zone water quality on the foreshores around Liverpool Bay [England] are reported for the period 1971-1974 inclusive. Five sites along the Lancashire coast were sampled at approximately monthly intervals throughout this period. Five supplementary coastal stations in Cumbria, Cheshire and North Wales were sampled for 24 mo. during 1972-1974 and 3 estuarine sites in Lancashire were sampled for 21 mo. during 1971-1972. Samples were taken at low water from just below the low water mark. Local interference from outfalls near the sampling sites was detected and allowed for by coliform determinations on each sample. A fairly predictable seasonal pattern was detected in most of the variables measured. During the summer the salinity and pH were higher and dissolved inorganic N concentrations very much lower than in winter. Dissolved reactive phosphate was too heavily buffered by the large amounts of suspended matter to show much seasonal variation. The water remained more or less saturated with dissolved O2. During the winter higher levels of coliforms were detected suggesting that die-off rates increased with increasing temperature. The Mersey appeared to exert a strong influence on the salinity and inorganic N and P concentrations of Liverpool Bay coastal water. Steep gradients were detected along the Lancashire and North Wales coasts towards the estuary. Only P and N showed any significant long-term changes. Phosphate concentration tended on average to increase over the 4 yr period at most stations. The average rate of increase along the Lancashire coast was about 17% per annum.sbd.very similar to that detected in other European coastal waters. The winter maximum nitrate concentration remained relatively constant during the period 1971-1973, but the maximum concentraton in 1974 was substantially higher than in the 3 previous years at most stations. If these increases prove to be a permanent feature of the area, excessive eutrophication probably soon will occur in the Bay. Monthly sampling at the 5 Lancashire coastal sites will continue indefinitely.

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