Current measurement technology for near-shore waters

This paper summarises recent experiences (in SCAWVEX and elsewhere) in meas uring near-shore currents, together with subsequent techniques of data anal yses. In situ instrumentation described includes: mechanical rotors, electr omagnetic and ADCP (Acoustic Doppler Current Profiler) deployed on sea bed frames, in towed mode, and mooring lines. Surface observations from the: Oc ean Surface Current Radar (OSCR) H.F. radar system are also included. Deplo yments are in estuaries, along open coasts and in tidal straits-all involvi ng strongly tidal regimes around the UK coasts. The characteristics, includ ing specific capabilities and limitations of each instrument are listed. Sy noptic comparisons are used to illustrate those components such as the dept h mean principal tidal constituents: which show good agreement and to highl ight other components, e.g., vertical profiles of residuals, most sensitive to the system adopted. A coordinate system suitable fur analysing net flux es in shallow estuary with large tides is described. Associated aspects, wh ich impact on planning current meter deployments, are outlined. (C) 1999 El sevier Science B.V. All rights reserved.