PRACTICAL APPLICATION OF MONITORING TECNOLOGY FOR DREDGED SEDIMENT DISPOSAL SITES USING UAV

Abstract

 Mizushima Port is facing the problem of a lack of a disposal site for dredged sediment due to the deepening of the channel, and in order to extend the life of the disposal site and increase its receiving capacity, construction has been carried out to reduce the volume of dredged sediment through consolidation settlement. At that time, in order to formulate an appropriate construction plan from dredging to soil disposal, we attempted to accurately understand the state of volume reduction through UAV surveying using a green laser that is not easily absorbed by water. Specifically, we investigated a method that enables high-precision surveying without installing adjustment points as instructed in previous manuals. We also investigated the characteristics of the green laser in terms of bottom quality, water quality, and transparency, which are unique to sediment disposal sites, and investigated methods to improve sounding ability. We have developed a monitoring method using UAV surveying by increasing the accuracy by introducing the PPK post-processing kinematic method and improving the sounding ability by expanding the laser divergence angle.