Author(s): Raphael Gaillard
Linked Author(s):
Keywords: No Keywords
Abstract: This paper presents two innovative cost-effective dredging techniques for managing sediment within the reservoir while respecting the operational rules (dam operation) and environmental constraints downstream of the dam due to the sediment release: NESSIE (New Environmental System for Sediment Innovative Evacuation) and LISIE (LIight Subaquatic Innovative Excavator). Both techniques relay on underwater dredging robots to remove fine sediment materials and dilute them in a controlled, continuous, and measurable way without any water and hydro-power production losses. The dredged sediment is discharged downstream of the dam while strictly complying with dilution criteria specified by the dam operator. Compared to NESSIE, LISIE is suitable for narrow reservoirs and can dredge sediment in the areas near to the dam gates or concrete constructions. Both techniques have proven their high performance in different operations.
Year: 2022