Print Email Facebook Twitter Vertical structure of the flow due to waves and currents - Laser-doppler flow measurements for waves following or opposing a current Title Vertical structure of the flow due to waves and currents - Laser-doppler flow measurements for waves following or opposing a current Author Klopman, G. Corporate name Deltares Project Kustgenese Date 1994-02-01 Abstract Changes in the mean horizontal-velocity profile in combined wave-current motion, outside the bottom boundary-layer, are essential for the correct prediction of cross-shore sediment transport outside the surf zone and the transport of dissolved matter, e.g. Klopman (1992). To be able to verify mathematical and numerical models (see Klopman, 1992) experimental data is needed. This is especially the case with the vertical structure of the wave and turbulence Reynolds stresses where data is lacking. For this reason, a laboratory experiment was conducted to study the flow kinematics under combined wave-current motion, for waves propagating in the current direction and for waves opposing the current. The wave-current facility in which the tests have been carried out is equipped with two computer-controlled wave boards, one generating waves and the other absorbing waves. Both wave boards have active wave-absorption systems which eliminate spurious waves. A constant discharge was provided by a flow-circulation circuit. Special care was taken in the design of the inflow and outflow structures, in order to introduce the current smoothly into the channel and to minimize unwanted reflections of the waves at the inflow and outflow. Flow velocities were measured in one vertical cross-section of the channel, with two laserDoppler velocimetry (LDV) systems, mounted at a fixed distance above each other. Water surface elevations were measured with six resistance-type wave-height meters, and the discharge was measured with an electro-magnetic flow (EMF) meter. Tests were performed with mono-chromatic, bi-chromatic and random waves without current, following the current and opposing the current. Also a test series was performed for a steady current without waves. Subject waveswave-current interactionreynolds stressesboundary layer Classification TLJ6000 To reference this document use: http://resolver.tudelft.nl/uuid:181f5c9c-f66f-4103-abe6-c4633137e351 Publisher Deltares (WL) Source WL report H840-30, part II, for Rijkswaterstaat, Part of collection Hydraulic Engineering Reports Document type report Rights © 1994 Deltares Files PDF Klopman_1994_-_H0840_30_2.pdf 14.16 MB Close viewer /islandora/object/uuid:181f5c9c-f66f-4103-abe6-c4633137e351/datastream/OBJ/view