In Situ Underwater Average Flow Velocity Estimation Using a Low-cost Video Velocimeter

Author:

Lertvilai Pichaya1,Roberts Paul L.D.2,Jaffe Jules S.1

Affiliation:

1. 1 Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA

2. 2 Monterey Bay Aquarium Research Institute, Moss Landing, CA 95039, USA

Abstract

AbstractThe development of a low-cost Video Velocimeter (VIV) to estimate underwater bulk flow velocity is described. The instrument utilizes a simplified particle image correlation technique to reconstruct an average flow velocity vector from video recordings of ambient particles. The VIV uses a single camera with a set of mirrors that splits the view into two stereoscopic views, allowing estimation of the flow velocity vector. The VIV was validated in a controlled flume using ambient seawater, and subsequently field tested together with an acoustic Doppler velocimeter with both mounted close to the coastal seafloor. When used in non-turbulent flow, the instrument can estimate mean flow velocity parallel to the front face of the instrument with root-mean-squared errors of the main flow within 10% of the ±20 cm/s measurement range when compared to an ADV. The predominant feature of the VIV is that it is a cost-effective method to estimate flow velocity in complex benthic habitats where velocity parallel to the sea floor is of interest.

Publisher

American Meteorological Society

Subject

Atmospheric Science,Ocean Engineering

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