Coast 3D : measurement errors of instruments for velocity, wave height, sand concentration and bed levels in field conditions

Field measurements of hydrodynamics, sediment dynamics and morphodynamics as perfomed during the COAST 3D campaigns at the Egmond site in 1998 and at the Teignmouth site in 1999 inevitably involve the problem of the accurancy of the measured variables. Information of the measurement errors involved can be obtained by comparing instruments based on different measurement principles under controlled conditions. In recent studies various types of instruments have been used to measure fluid velocities, wave heights and sand concentrations during experiments in wave tanks. In addition data sets from various field experiments are used to evaluate the performance of the instruments considered. In this note some results of instrument intercomparisons are presented. Furthermore, information of instrument characteristics are given.