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TUFLOW 2D Cell Size Selection: Difference between revisions

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The following grid resolutions were used to test the impact of cell size on the assessment results and simulation time:<br>
* 10ft (3.0m) cell resolution – 5,821,533 total cell count
* 12.5ft12ft (3.7m) cell resolution – 34,725042,781960 total cell count
* 15ft (4.6m) cell resolution – 2,587,629 total cell count
* 20ft (6.1m) cell resolution – 1,455,869 total cell count
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| '''10ft (3.0m) cell size <br><br>5,821,533 total cell count<br><br> 20.3hr simulation run time'''||N/A <br><br>The histogram graphs below are calculated by subtracting <br>the peak (maximum) flood level result from the 10ft cell <br>resolution peak (maximum) flood level result <br>(shown to the right) || [[File:Mesh_Converge_Direct_Rainfall_10ft_002.png|500px]]
|-
| '''12.5ft12ft (3.8m7m) cell size<br><br>34,725042,781960 total cell count<br><br> 1315.9hr0hr simulation run time'''||[[File:Mesh_Converge_Direct_Rainfall_12ft_HIST.png|550px]] || [[File:Mesh_Converge_Direct_Rainfall_12ft_002.png|500px]]
|-
| '''15ft (4.6m) cell size<br><br>2,587,629 total cell count<br><br> 9.2hr simulation run time'''||[[File:Mesh_Converge_Direct_Rainfall_15ft_HIST.png|550px]] || [[File:Mesh_Converge_Direct_Rainfall_15ft_002.png|500px]]
|-
| '''20ft (6.1m) cell size<br><br>1,455,869 total cell count<br><br> 3.8hr9hr simulation run time'''|| [[File:Mesh_Converge_Direct_Rainfall_20ft_HIST.png|550px]] || [[File:Mesh_Converge_Direct_Rainfall_20ft_002.png|500px]]
|-
| '''30ft (9.1m) cell size<br><br>647,003 total cell count<br><br> 1.4hr3hr simulation run time'''|| [[File:Mesh_Converge_Direct_Rainfall_30ft_HIST.png|550px]] || [[File:Mesh_Converge_Direct_Rainfall_30ft_002.png|500px]]
|-
| '''50ft (15.2m) cell size<br><br>232,957 total cell count<br><br> 0.5hr simulation run time''' ||[[File:Mesh_Converge_Direct_Rainfall_50ft_HIST.png|550px]] || [[File:Mesh Converge Direct Rainfall 50ft 002.png|500px]]
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| 10ft (3.0m) || 5,821,533 || 20.3hr || Yes
|-
| 12.5ft12ft (3.8m7m) || 34,725042,781960 || 1315.9hr0hr || Yes
|-
| 15ft (4.6m) || 2,587,629 || 9.2hr || Yes
|-
| 20ft (6.1m) || 1,455,869 || 3.8hr9hr || Yes
|-
| 30ft (9.1m) || 647,003 || 1.4hr3hr || Mostly
|-
| 50ft (15.2m) || 232,957 || 0.5hr || No
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As per Test Case 1, selection of the appropriate cell resolution during a real-world project requires consideration of the intended use of the results and also how the simulation run time impacts the overall project timeline.
* Detailed integrated 1D/2D urban modelling may adopt the 15ft (4.6m) or slightly finer 12.5ft12ft (3.8m7m) cell resolution if the cumulative simulation time for all model events/scenarios does not adversely impact the project timeline. This timeframe consideration is particularly relevant in locations such as Australia where an ensemble methodology is currently replacing single event approaches as a way to address uncertainty associated with hydrologic assumptions.
* Broad-scale quick run simulation for urban flood forecasting purposes may adopt a coarser 20ft cell resolution or investigate the suitability of a 25ft cell resolution to achieve a quicker simulation turnaround time.
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