Measurement of Wave Near-Bed Velocity and Bottom Shear Stress by Ferrofluids

作者：Musumeci Rosaria Ester^*; Marletta Vincenzo; Ando Bruno; Baglio Salvatore; Foti Enrico

来源：IEEE Transactions on Instrumentation and Measurement, 2015, 64(5): 1232-1239.

DOI：10.1109/TIM.2014.2359521

• Bed velocity
• bottom shear stress
• ferrofluid
• inductive readout
• sediments
• waves

A novel direct measurement strategy of wave near-bed velocity and bottom shear stress based on the use of ferrofluids is presented. The proposed methodology is aimed at overcoming some of the limits of state-of-the-art instruments, for use in presence of both surface waves and sediments. An inductive readout strategy is proposed to sense displacements of the ferrofluid spike over the inductive circuit due to the flow. Experimental tests have been performed in a wave tank both in hydrostatic conditions and in the presence of regular linear waves corresponding to deep and intermediate water depth cases. Obtained results indicate the applicability of the proposed strategy also in the presence of suspended load (either moderate or intense) and of a moderate bed load transport.

• 出版日期2015-5