Dissolved-oxygen/suspended-solids concentration relationships in the upperHumber Estuary

Results of dissolved-oxygen concentration from continuous monitors at one l ocation on the (Yorkshire) tidal Ouse and two locations on the tidal Trent have revealed a strong dependence upon the concentration of suspended sedim ent. High concentrations of sediment lead to a lowering in dissolved-oxygen levels. A comparison of this effect between the two rivers reveals lower d issolved-oxygen concentrations in the River Ouse than in the River Trent fo r a given concentration of suspended sediment, which is partly due to a dif ference in the quality and quantity of pollutant discharges into the Ouse c ompared with the Trent, Because the concentration of suspended solids at a given location is known to be dependent upon the fresh-water flow and the t idal range, it is concluded that the dissolved-oxygen concentration is also strongly dependent upon conditions of fresh-water flow and tidal range for these two tidal rivers.