Calibration (under increasing complexity)
Posted: January 10, 2014 Filed under: Uncategorized Leave a comment
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Against the background of the 2km x 30Ha Levisham hydraulic analysis – here – the table below lists 2D models run to assess the productivity of finite element meshes derived from assembled point clouds of increasing complexity. Denser point clouds are tested towards a productivity goal of 30,000 CFD nodes solved in real time x 3 (ie: a 15 minute time-series fed to a 500ha x 20node/ha floodplain & solved to 1% convergence in 5 minutes) .
References: OS map here, relief map here, and animation here
Model | km x Ha | In-Flow | Tributaries | Out-Flow | Graphics |
pk2a1 | 12 x 160 | 3 @ 67.0 | none | Q=0.07H^1.8 | Here |
pk2a4 | |||||
pk2b6 | |||||
pk2b7 |
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Column Heading Legend
- Model filename: ‘pk’=pickering; ‘2’=12km reach; ‘a,b’=configuration; ‘1’=build
- Footprint: River length (km) and ‘Q-T200’ wet area (ha)
- In-flow discharge characteristics: m3/s x water surface level aod
- Tributary discharge inflow (m3/s)
- Out-flow discharge relationship : H=stage; k & m parameters of flume equation Q = kH^m
- Graphic: Click for illustrations relating to hydraulic models
Models
a. Steady Flow; Main channel only; Vee discharge in; Flume discharge out
pk2a1 4000 node point cloud budget; elevation data resampled from various sources; Productivity goal = 24hr hydrograph in 50mins @ 3% convergence tolerance; vee-form bed; build 1 canalises the flow to test boundary flumes; tributaries and friction features excluded; TIN points from ‘risk’ buffer GIS lines below;
- River centreline resampled @ 16m to 760 nodes; elevation from smoothed radar minus 3m
- Tributary centrelines resampled @ 16m; elevation also from smoothed radar minus 3m
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Flumes : Inflow (North, Levisham) and outflow (South, Ropery Br) built relative to first & last c/line points and outwith the boundary of terrain elements
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LR (LeftRight) banklines; buffer=4m; excluded from this CFD mesh
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LR bermlines; buffer=8m; resampled @ 16m to 1520 nodes; elev=radar+3
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LR Q24lines; buffer=24m; resampled @ 32m to 760 nodes; elev=radar+3
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LR Q40lines; buffer=40m; resampled @ 64m to 276 nodes; elev=radar+3
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LR Q100lines; buffer=50m; resampled @ 50m to 380 nodes; elev=radar
File structure for River 2D terrain TIN and CFD Mesh | |
For TIN (.bed) file in R2D
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For CFD (.msh) file in R2D
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Location Map
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