Monitoring of a near-bed turbid layer

To monitor the movement of a near-bed turbid layer it is necessary to know the thickness, density, speed and direction of movement within precise limits. It is also desirable to know how the layer moves in relation to the water column above. To meet these requirements, an instrument has been developed at HR. It was tested in the tidal reaches of the Bristol River Avon and results from the study have established the existence of such a turbid layer and indicated that its direction of flow is dependent on other factors in addition to water movement in the column above.