2d linear structures and breach modelling in...
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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
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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
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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
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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
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2D Sluice/Bridge
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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.
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Software Demo-Linear Structures
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2D Linear Structure Results
Overtopping and Porous Flow
Opening Flow Total Flow
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2D Structure Applications Walls/Porous Walls Weirs Orifice Sluice Bridge/Culvert Flap Valve (using No Reverse flow option)
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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
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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)
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Software Demo-Breach in a Linear Structure
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Breach Results Grid View Graph View Section Pick Tool
3D View (with animation)
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Summary Can now represent structures in 2D GPU Compatible Full 2D River Model Breach modelling in a range of different dimensions