Monitoring and Deformation Analysis of Groynes Using Tls at the River Elbe

摘要: Abstract. To enter the Port of Hamburg, one Europe’s busiest ports all vessels need to navigate around 145 km along Elbe river, a tide influenced navigation channel. protect shoreline from erosion and channel waterway groynes (rigid hydraulic structures) have been built river. In past years since ca. 2001 there has large increase in damage structural integrity at parts German waterways. The reason for this was determined ever growing size container passing by inducing long periodical primary waves which such force that they erode rock structure. analyse improve resistance vessel-induced wave loads an in-situ study is carried out Juelssand, located river estuary. Over period two change geometrical structure different groyne shapes monitored automatically utilising terrestrial laser scanners mounted protective housings, each on 12 m high platform. self-contained monitoring systems perform scanning times day low tide, as structures are fully submerged tide. long-periodical also using pressure sensors groyne. correlate captured data with vessel events effects, related parameters recorded utilizing Automatic Identification System (AIS). This paper describes automated processes acquisition focusses deformation calculated current, extended new algorithms Point Cloud Library. It shows process chain raw scan files elevated station filtering point cloud, registration, calculation pointwise changes aggregation grid later correlation ship parameters. When working outdoor kinds weather conditions, equipment be robust account various cases situations. especially applicable algorithms, adaptable scenarios like wet surfaces or snow unwelcome objects ranging flotsam birds sitting At current stage research, magnitude couple decimetres observable. orientation location seaward side corresponds lower distance leaving harbour.