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2D Linear Structures and Breach Modelling in ICM
Dr Duncan Kitts
Innovyze Drainage and Flood Modelling User Day
Wednesday June 25th 2014
Floodplain Structures Increasingly modelling in 2D Structures commonly represented by:-
Mesh Zones • Ignores surcharge and headloss effects • Ignores 2 layer flow
1D Links • Lose momentum • Can introduce instabilities
Now can represent in 2D
Base Linear Structures
Line to represent structures such as walls/weirs within 2D simulations Walls (supersede existing functionality) Weirs (thin plate or broad crested) User control (user defined head-unit flow curve)
The crest can be:- Constant (height or level) Irregular
Porosity, headloss coefficient and lateral friction coefficient can be added
Flow direction can be set to be uni-directional
2D Sluice/2D Bridge Can be associated
with a 2D Base linear structure, eg a wall/weir
Flow calculated on an element face by face basis
2 Layer flow Opening Overtopping
Sluice is rectangular shape, bridge is user-defined shape
2D Sluice/Bridge
2D Sluice/Bridge Linear Structures
Flow type:- Free
• Free flow consistent in free and pressurised situations so smooth flow profile during transitions. Controlled by head difference and momentum.
Controlled • Controlled by standard weir and orifice equations. Flow calculation is based
on head difference.
Orifice • Free flow during free surface conditions and orifice flow during pressurised
conditions. Flow is only based on head difference.
Software Demo-Linear Structures
2D Linear Structure Results
Overtopping and Porous Flow
Opening Flow Total Flow
2D Structure Applications Walls/Porous Walls Weirs Orifice Sluice Bridge/Culvert Flap Valve (using No Reverse flow option)
Breach Modelling Time-Varying Geometry can be added to:-
Inline Banks (allow 1D Breach) Banklines (allow 1D-2D Breach) Base Linear Structures (allow 2D Breach)
Use Real Time Control (RTC) to vary geometry
Real Time Control Specify elevation values for particular time periods Can use RTC for several banks/linear structures or
several RTC for different points on banks/linear structure Height above datum Depth-Subtracted from specified bank level
Can decrease elevation (breach) or increase elevation (build up embankment)
Software Demo-Breach in a Linear Structure
Breach Results Grid View Graph View Section Pick Tool
3D View (with animation)
Summary Can now represent structures in 2D GPU Compatible Full 2D River Model Breach modelling in a range of different dimensions
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