Use of continuous turbidity sensor in the prediction of fine sediment transport in the turbidity maximum of the Trent estuary, UK

摘要

Results from field observations using continuous monitors of turbidity and water level at Burringham, R Trent, UK, are presented, for the period 18 May to 3 December 1997. These results, together with measurements of vertical profiles of velocity and suspended solids concentration (SSC) at a nearby location enable some conclusions to be drawn relating to the response of the TM to tidal range (TR) and fresh water flow (Q{sub}f) in the tidal Trent. The temporal variation in vertical profiles of velocity and SSC means that interpretation of results from fixed continuous monitors must be carried out very carefully, owing to the high degree of suspended solids stratification at high slack water and during the first few hours of the ebb tide. SSC is a function of local bed shear stress (related to tidal range) and sediment availability, which is controlled by the antecedent Q{sub}f. A semi-empirical predictive relationship is recommended for predicting flood and ebb tide SSC, based on tidal range, for various different antecedent fresh water flow conditions.