Measurements and Synthetic Imaging of Water Surface Gravity Waves using Optical Techniques
Abstract
Remote sensing technologies are useful tools when gathering spatial and
temporal information about dynamic coastal regions. A method is proposed using
an in-situ space-time imaging technique for evaluating wave periods and
wavelengths of surface water waves in shallow urban coastal water environments.
Video imagery of shallow water waves was acquired using high definition video
cameras. Video imagery records of surface water waves using staff gauges and
simultaneously deployed targets were used to determine wave periods, wavelengths
and wave amplitudes. Time series analyses is applied to the video derived time
series. Wave energy spectrums are extracted and used to simulated synthetic images
using a gravity wave model based upon a Weibull probability distribution that
simulates the sea state. Hyperspectral imagery had been collected (Bostater and Oney, 2017) by
applying a pushbroom motion camera using a video based hyperspectral sensor that
records water surface waves. This device can be operated in a space-time recording
model. The hyperspectral imagery demonstrates how space-time imaging can be
collected of bidirectional reflectance factor (BRF). The hyperspectral measurements
of water waves demonstrate a new methodology and understanding to increase our
remote sensing of coastal water surface wave processes.