Sub-Grid Sampling and Quadtree
TUFLOW’s recent implementation of Sub-Grid Sampling and Quadtree grid refinement produces quality results without the need for a small cell size throughout the entire TUFLOW grid. 12d Model 15 includes both of these features, so I caught up with Chris Huxley from TUFLOW and our very own Rob Graham to discuss the detail behind these improvements and how they have been implemented into 12d Model.
Chris is a principal engineer for TUFLOW with over 17 years’ experience in the field of flood/stormwater modelling and floodplain management. He is currently a senior member of the TUFLOW hydraulic modelling software development team. He is also an Adjunct Lecturer at Central Queensland University where he teaches hydraulic modelling. Prior to his current role in the software development and teaching sectors, Chris worked in consulting and successfully carried out and managed numerous catchment-wide riverine and stormwater flood studies and floodplain risk management investigations throughout Queensland and New South Wales, as well as in California, USA.
Rob Graham, for those who don’t know him, is our resident Water Resources Engineer, with over 20 years of experience here at 12d and over 30 years’ in the hydraulic and hydrological modelling field industry. Commencing with physical hydraulic modelling and river surveys, Rob’s projects moved focus onto numerical modelling for flood and hydro-electric studies. In 1985 he began developing hydraulic models with close linkages to data terrain modelling software. Today he leads the integration of TUFLOW inside 12d Model.
The session was a very interesting one. Chris ran us through two new features in TUFLOW: Sub-grid topography sampling and Qudtree mesh refinement. He discussed the implications of these on modelling. Rob then showed us how these work inside 12d Model 15. We also looked at a short Quadtree SGS video produced by 12d of the Sheffield Water Quality Project, to see an example of Sub-Grid Sampling and Quadtree used to analyse flow through a water quality structure.
–Lisa Stewart