Author(s): Naoki Fujimura; Ryota Saito; Michio Sanjou
Linked Author(s): Michio Sanjou
Keywords: Boat-type float; Free-surface velocity; Riverine and coastal survey
Abstract: The present study develops a safety survey system for measuring free-surface velocity in riverine and coastal areas. The new system is a boat-type float with a Global Positioning System (GPS) receiver, which can safely and quickly monitor a river. This float navigates automatically to the target point on a free surface. After which, it runs freely downstream, detecting the time-series of self-position with a centimeter-order accuracy using the realtime kinetic GPS method. It also measures the local water depth using an ultrasonic sensor during the drifting downstream. The same works are repeatedly conducted on all survey lines to evaluate the discharge through a target cross-section.
Year: 2024