Deltares and J-Power have been working together for more than 20 years, on improving and applying the knowledge and tools related to sediment management in rivers with reservoirs considering the river basin-wide ecosystem. Consequently, this research aims to build on the previous development of sediment transport and ecological processes and the recently implemented functionality in the Delft3D4 software. The development will be migrated and implemented in our new flexible mesh software (Delft3D-FM).
In the previous years of this collaboration, Deltares tools (Delft3D4 and real time control toolbox) have been developed to provide the real-time impact of gate operations on reservoir sediment flushing and sluicing. This helps to find an optimal solution for gate operation. These new developments have been validated in Funagira Dam (Japan), Marmot Dam (USA), Marsyangdi cascade dams system in Nepal. Several conference papers have been published to demonstrate and outreach our knowledge, tools and accomplishments. The knowledge and tool are used in other assignments that Deltares has been involved in with external partners, for example in India (Dakpathar Dam) and Laos (Mekong cascades dams). In the Netherlands, some consultants have used this approach to optimize the operation of Sea barriers. Furthermore, to improve the ecosystem services in regulated river, the fish habitat is one of the main components to be considered. Therefore, the collaboration continued to develop the habitat modelling and provide an integral tool to investigate the hydrodynamics, the morphology, the habitat modelling and provide optimal solution considering the dynamics of the system and the interlinkages between these components. The new Delft3D flexible mesh software (Delft3D-FM) is the successor of Delft3D4. The software has added values like future possibilities of modelling 1D,2D and 3D in one model domain and its flexibility in schematization and grid generation. Therefore, we are migrating our development to Delft3D-FM. This development of Delft3D-FM includes morphology, reservoir management, dam operation (RTC-tool) and ecology, and will be validated based on new data, provided by J-Power. The application and validation will consider the coupling between morphology, habitat diversity and RTC tools in complement with the development of Delft3D-FM and Delta-Shell platform. New routines will be developed that link hydro-morphological processes, dam operations (single and synchronized) and ecology. These models with new functionality and routines will be tested, validated and applied in case studies in reservoirs in Tenryuu River, Japan (owned by our collaborator J-Power).
In this research collaboration, we will optimize the reservoir operation considering the sediment management as one of the main parameters (e.g. hydropower, environmental flow and/or other water use purposes). D-RTC 2 tool will be used for optimization.
In addition, the need for a large scale synchronized operation of multiple reservoirs considering both sediment and ecology, makes it important and useful to develop more reliable 1D model using Delft3D-FM for three cascading dams (Sakuma, Akiba and Funagira). The outcome of this research is expected to be contributing to our knowledge and software development as well as their dissemination and outreach through our joint presentation and publication in conferences/journals.

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