Sea Technology • June 2022 • Page 14

3D Bathymetry via USV USV with Multibeam Echosounder for Shanghai Bridge Survey By Taxiya Wang T he Donghai Bridge, located in Shanghai, China, is a key component of the Shanghai International Ship-ping Center’s deepwater port infrastructure. Conducting underwater surveys of the bridge piers’ conditions for maintenance purposes is an operational chal-lenge. The bottom of the bridge piers is immersed in water and can be eroded by the action of sand and gravel. Hydrodynamic scour caused by rapid water ow can create scour holes and compromise the integ-rity of the structure. To determine whether piers need to be protected by additional riprap, the precise sediment Donghai Bridge, Shanghai. (Inset) The CHCNAV APACHE6 USV surveying the Donghai Bridge piers. 14 ST | June 2022 www.sea-technology.com