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IAHR course on reservoir sedimentation

IAHR course on reservoir sedimentation

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SESSION 2 – Delft3D-FM and D-RTC.

A basic two-dimensional (2D) depth-averaged modelling of reservoiroperation and sediment transportusing Delft3D-FM coupled with D-RTC

The Delft3D Flexible Mesh Suite (Delft3D FM 1D, 2D, 1D2D and 3D) can simulate detailed flows, waves, sediment transport, morphology and water quality, and is capable of handling the interactions between these processes. The flow module of this system provides the hydrodynamic basis for other modules such as morphology, water quality, ecology etc. The model is able to be run in two-dimensional (2D) mode, which corresponds to solving the depth-averaged equations. The 2D version of the morphological model can be used to compute details of hydrodynamic and morphological behaviour of the river reaches, particularly with interventions like weirs, dams and barrage. As the model incorporates also complex time-dependent multi-dimensional phenomena, assessment is also possible at the small and intermediate spatial scales. 

The important hydraulic structures are barrages, weirs and dams including their operation. Both one- and two-dimensional models are coupled with Real-Time Control (D-RTC) tool. D-RTC is capable to link the gate operation with the required water levels at the reservoir. This means that providing input of one of them (gate opening, or reservoir water level based on operation rules) enables the model to compute and/or control the other component. The Deflt3D- FM model coupled with D-RTC can also be used for a system of multiple dams with synchronized operation. 

Within the scope of this short session, participants will be able to familiarize themselves with the setting up and running a reservoir model with dam operation. 

We will also try to incorporate sediment transport and morphological processes in the modelling exercise (if time allows). This session will provide the participants an idea about how a process-based model can be applied to carry out simulations and analysis of reservoir operation and sediment transport processes. Such a process-based model can also be applied to determine the inputs for RESCON 2 in more precise manner. The Deflt3D-FM software will be provided to the participants to be installed on their computers before the session. Also, a handout with the modelling steps for a hands-on exercise will be provided.

The course is organized by the IAHR Working Group on Reservoir Sedimentation