An Integrated Hydrodynamic Approach to River, Sewer and Overland Flow Modelling presented by Andrew Walker Innovyze Ltd

Modeling is now a pre-requisite to understanding the impact of Urban Development Government Directives dictate that Utilities and Cities now strictly control and closely manage their drainage networks.

The ability to simultaneously represent all flow paths is a necessity for integrated studies Requirement : To model “all sources” of flooding. Solution : Fully Integrated Catchment Analysis.

Fully integrated 1D and 2D simulation of above- and below-ground drainage networks in one powerful package To succeed, the software needs to combine these advanced modelling requirements in a single application with one Simulation engine.

The 1D Engine Requirements Free surface and pressurized flows Flows not following predetermined directions Backwater effects Small depth situations Dry initial conditions Looped networks Pipes, culverts and non-prismatic channels Ancillary structures, including bridges

The 1D Engine Solution Solves the full dynamic equations of gradually varied flow (St. Venant equations) A four-point implicit finite difference scheme Non-linear Newton-Raphson iteration and an adaptive time-stepping algorithm Convergence to within a relative tolerance of 1% before proceeding to the next timestep Solution method is unconditionally stable, so there is no limit on the magnitude of the time-step to ensure stability

The 2D Engine Requirements Suitable for surface flood flows Fits around complex urban geometry Efficient run-times Simple to couple with existing 1D models InfoWorks 2D/3D slide   In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

The 2D Engine Solution Finite volume Conservation of mass and momentum Unstructured triangular mesh Gudunov scheme – Riemann solver Semi-implicit, dual time-stepping Runge-Kutta (predictor-corrector) Shock capturing InfoWorks 2D/3D slide   In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

The 2D Mesh Generation Floodplain in rural area Simple structured mesh 2D Hydraulics Complex geometry in urban area Detailed unstructured mesh

2D Linkages with 1D Model

2D Linkages with 1D Model

2D Engine Results InfoWorks 2D/3D slide   In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

Calculate overland flow path and likely property inundation 2D Engine Results InfoWorks 2D/3D slide   In the future we will supply a version of InfoWorks with full 2D and 3D hydrodynamic flow, using the SULIS engine. And this model will include simulation of waterquality and sediment.

River Flooding and Bridge Inundation 2D Engine Results River reaches Bridges Radial sluices Flood mapping

The ability to simultaneously represent all flow paths is a necessity for integrated studies

1D and 2D Integrated Results Case Study - Calculate cause of property flooding – stormwater or river flooding? 1D and 2D Integrated Results

An Integrated Hydrodynamic Approach to River, Sewer and Overland Flow Modelling

An Integrated Hydrodynamic Approach to River, Sewer and Overland Flow Modelling presented by Andrew Walker Innovyze Ltd