BATHYMETRIC SURVEY FOR THE DREDGING OF SAN BARTHOLOMEW RIVER IN AKUKUTORU LOCAL GOVERNMENT AREA OF RIVERS STATE, NIGERIA
K.U. Orisakwe1, Aliyu A.2 and Sarkinzango I.3
1,2&3Department of Surveying and Geoinformatics
Modibbo Adama University of Technology Yola, Adamawa State, Nigeria
E-mail: aminu.aliyu48@yahoo.com
Abstract:
Data acquisitions started by using the designed map obtained from Shell Petroleum Development Company (SPDC). Controls used along the pipeline right-of-way were established and confirmed using the Leica 406 Total Station and Leica NA42 Automatic Level instruments. Traversing and Profile levelling were done also along the existing pipeline route. Data processing and analysis were carried out via the AutoCAD 2007 and Hypack Survey Navigation Software. Levelling data was reduced to Nembe Lowest Low Water Level (NLLWL) and elevation below NLLWL was obtained and plotted in AutoCAD 2007. Trimble SPS 361 Global Positioning System (GPS) receiver was interfaced with SyQuest Bathy 500 multi-frequency Echo Sounder and used for the pre and post bathymetric survey. The Hypack Navigation Survey Software was used to process the bathymetric data. As a result dredged quantities volume was obtained as 367165 cubic metres (m3) together with the profile of river bed and depth of dredging. The process of online dredging system using the GPS and the Dredge Pack Presentation System (DTPS) software was used to guide the suction dredger system.