Help needed

[Henry Luiz]

Hi,

thank you for letting me join. I have no experience with working QGIS.

I am seeking help if someone can create, if possible, an animated video showing flooding levels of the July 2007 floods in Loch Sport, Gippsland, Victoria.

Regards

Henry

[Emma Hain]

Hi Henry

If you are keen to do it yourself, here you go:

Crayfish plugin: https://www.lutraconsulting.co.uk/blogs/visualising-dam-breach-in-qgis

Tutorial: https://www.youtube.com/watch?v=wVXbsfIr9j0

Kind regards

Em

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[Chathrua Wickramasinghe]

HI Henry,

Are you thinking like a 3D flyover or an animation with a gradual flood increase? For the first part, you can use 3D map with a DEM and assigning a z value to your flood layer which is normally 2D. 

Cheers 

Chathura

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[Henry Luiz]

Hi Emma,

I am part of a small team that is trying to understand the impact of 2007 floods in Loch Sport Victoria Melbourne, Australia.  I understand it is sometime ago, but the Loch Sport Flood Overlay Group (LSFOG) is trying to get the local council to engineer a flood causeway. 

The LSFOG has the support of the local community and information can be found  at https://gippslandfloodoverlay.com.au/

The group has zero experience on how to do this animated time lapse flood map. I have attached a report on the flood that has some data on time and depth. 

I am not sure if this report has enough data to do this simulation.

Appreciate if you provide some guidance in this.

regards

Henry

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Regards

Henry

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[Emma Hain]

Hi Henry

I am not a specialist in this. If you need this to be undertaken, then I suggest you look for a specialist to assist, otherwise, you can find someone in your group that is willing to train themselves so you become self-sufficient. 

Alternatively, contact the Australian Water School.

Kind regards

Em

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[Neil Falconer]

Hi Henry,

While QGIS is able to model the inundated area & perform basic simulation, given the purpose of the project ie to justify a flood causeway, I would suggest that one consider using HECRAS (which is also free) A HECRAS project will permit one to accurately model the current status (using the correct river hydraulic formula) and one can then insert the proposed causeway & rerun the model to confirm the impact of the causeway.

One will need to obtain an accurate DEM, Landcover data, river bathymetry data (ideally but not too critical at this stage), Upstream river control data to establish upstream “Boundary control” & approximate river channel slope on the downstream side for the “Downstream Control”

HECRAS has great animation capabilities & I’m sure the end results would easily be able to be brought into QGIS via one of the many QGIS HECRAS plugin options.

Trust this info is helpful.

Regards

Neil

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[m...@mdgeo.au]

Hi Neil, a side question (which might or might not be yet another software that might meet Henry's needs). What about RORB, is that a contender to model the situation? (I don't know anything about flood modelling but wish to learn. I intend to teach myself RORB this year. As a physical geographer and GIS person I only know about geographical description via spatial data.) Cheers, Mark Dowling.

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