Abstract
Abstract. Marginal erosions in reservoirs of hydroelectric plants have caused economic and environmental problems concerning hydroelectric power generation, reduction of productive areas and devaluing land parcels. The real extension and dynamics of these erosion processes are not well known for Brazilian reservoirs. To objectively assess these problems Unesp (Univ Estadual Paulista) and Duke Energy are developing a joint project which aims at the monitoring the progression of some erosive processes and understanding the causes and the dynamics of this phenomenon. Mobile LASER scanning was considered the most suitable alternative for the challenges established in the project requirements. A MDL DynaScan Mobile LASER M150 scanner was selected which uses RTK for real time positioning integrated to an IMU, enabling instantaneous generation of georeferenced point clouds. Two different reservoirs were choose for monitoring: Chavantes (storage plant) and Rosana (run-of-river plant), both in the Paranapanema River, border of São Paulo and Paraná States, Brazil. The monitoring areas are scanned quarterly and analysed with base on the point cloud, meshes, contours and cross sections. Cross sections are used to visualize and compute the rate and the dynamics of erosion. Some examples and quantitative results are presented along with an analysis of the proposed technique. Some recommendations to improve the field work and latter data processing are also introduced.
Highlights
Marginal erosions in reservoirs of hydroelectric plants have caused economic and environmental problems concerning hydroelectric power generation, reduction of productive areas and devaluing land parcels
Monitoring activities are scheduled to occur quarterly. These monitoring activities were defined in order to obtain information on the study areas at different stages of the operational conditions of the reservoirs, which levels vary throughout the year
The nominal accuracy of the hardware is around 5 cm which is suitable for the target application, but the actual achieved accuracy has to be assessed either with fixed reference objects or comparing the point clouds acquired in different epochs
Summary
Marginal erosions in reservoirs of hydroelectric plants have caused economic and environmental problems concerning hydroelectric power generation, reduction of productive areas and devaluing land parcels. The real extension and dynamics of these erosion processes are not well known for Brazilian reservoirs To objectively assess these problems Unesp (Univ Estadual Paulista) and Duke Energy are developing a joint project which focuses on monitoring the progression of some erosive processes and to understand the causes and the dynamics of this phenomenon. Monitoring coastal areas and fluvial processes are critical tasks to which several techniques have been used, from aerial photographs, orbital images, land surveying, terrestrial photogrammetry and, more recently Terrestrial and Mobile Laser Scanning These new technologies are advantageous because of its high accuracy and time of response. In this case laser scanning and imaging are performed from a boat moving along a river course and are used to enlarge the coverage of terrestrial scanning
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
