Measurements of GPS drifting buoy/float with diving mechanism staying in the target depth for the measurement of tidal flow

Abstract

We have developed a drifting float having a buoyancy adjustment mechanism that can maintain the target depth. This float is measured by the GPS position at the time of surfacing. Although GPS is not available in water, it is possible to estimate the flow rate of the target depth from the position of before and after diving. It shows the experimental results in the vicinity of the Kuma-gawa River estuary of Yatsushiro Sea.