Issue with 1.9g using spatially variable mannings

[Tom]

Hi Everyone,

Chris Skinner has picked up an issue when using the spatially variable mannings (n) where different model runs were giving different results when using same parameters.

This is due to mannings being a global variable, but this leads to issues within the loops calcualting water fluxes when implemented in parallel. Its readily solved and I'll either post up an update of 1.9g or a new version (I prefer an update rather than new version at this moment in time to keep it simple) - but be aware if you use these options. 

All the best,

Tom

[Eleanor Pearson]

Good Morning Tom, 

I'm currently using Caesar-Lisflood 1.9g on an artificial test catchment to gain an understanding on how each parameter works before using it on a real catchment. I've found that this issue with the spatial distribution of Manning's is causing differences in my results, I was just wondering when the update will be ready? 

Many thanks, 

Eleanor Pearson

[Tom Coulthard]

Hi Eleanor – its actually a pretty quick fix – its just a bit of a pain updating the pages on sourceforge and the various other files there. If you need it urgently give me a direct email and I can send you a corrected .exe

Tom

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[Nichols Gutiérrez]

Hi Tom, 

I wonder if you could send me a fix version that you mentioned above. I already working with manning values too.

Regards, 

Nichols Gutierrez

[Tom Coulthard]

Hi Nicholas – try this link:

https://1drv.ms/u/s!AhKYMIYk2hJ9pP09sOyQwtTQSsXogg

 

Let me know if it works or doesn’t!

[Nichols Gutiérrez]

Hi Tom,

I work with it now, I wondering to tell you next result soon

Respectfully, 

Nichols 

[Raphaël]

Hi Tom

I'm working with the source code of the model. 

Could you put the source code online with the corrected error or explain how to correct the error (if it is an easy error to solve)?

Many thanks, 

Raphaël

[Tom Coulthard]

Sure. Can it wait until Monday - I’m on fieldwork at the moment. 

[Tom Coulthard]

Hi Raphael: see attached.

Tom

[Raphaël]

Hi everyone,

I made some comparisons between the corrected and uncorrected versions of the model for the Mannings variable.

The differences are surprisingly very large with a sediment production 25 times lower with the corrected version of the model.  

But it seems that this aspect did require correction since for the uncorrected version of the model, the use of a spatially distributed mannings produces fluxes that are not always included in the range of fluxes produced with uniform mannings values corresponding to the extremes of the distributed file. Fortunately, this is the case with the corrected version of the model. 

So there was indeed a problem at that level. Thank you Chris and Tom !

All the best,

Raphaël

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[Tom Coulthard]

Good! Glad it’s working OK!!

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