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Hi Tom,
My DEM has 50m grid cells, the text file has 308 columns and 280 rows. I’ve shortened my rainfall input file to 600 years which is a little bit over 5 million rows, I also did what you suggested and set the memory limit to 2, and then I was more specific with the run duration hours. I worked out 600 years was around 5,260,000 hours which I entered into the maximum run duration box and it all seems working fine now with no error messages! Thank you very much for your help! This is a bit of a daft question, but as there is no specific elevation input box, I’m assuming I put the saved elev.txt file into the DEM data file box instead of the DEM?
Thanks
Lisa
Sent: 09 July 2010 10:41
To: Lisa
Subject: RE: CAESAR Forum Registration Request
Hi Lisa,
OK, the problem is that when Caesar starts, it allocates memory to the variables – and if they are too large it will throw up an error. 1000 years = over 8million hourly data points – so this is where it may be throwing things out.
A quick Q, how large (in cells) is your DEM?
Two suggestions, try setting memory limit to 2 – this halves the size of memory occupied by the grainsize parts of the model...
Second, try running it in 250 or 500 year chunks. The elev.txt and grain.txt files outputted by the model can be used as inputs. So you can stop and start the model again etc..?
Tom
To: Thomas J Coulthard
Subject: RE: CAESAR Forum Registration Request
Hi Tom,
Thanks for my username and password! I have tried to increase the maximum run duration hours, but when I add more zeros (over 7 zeros) I get more error messages either saying ‘Exception of type System.OutOfMemoryException was thrown’ using 8-9 zeros or ‘value was either too large or too small for an Int32’ with 10 plus zeros, and the model won’t run at all. My memory limit is set to 1 (which I thought was the largest value), should it be set to a different value?
Thanks
Lisa
Sent: 08 July 2010 12:19
To: Lisa
Subject: RE: CAESAR Forum Registration Request
Hi Lisa,
I’ll mail you a username when I next log on..
In the meantime – its probably because the length of the simulation (the time in hours you put in a box for how long the sim should last) does not tally up with the length of the rainfall record... ie if its set at 10000 hours and the rain data is much longer then you will get this error and the model will stop after 10000 hours... I think (from the top of my head) this warning comes up if the rainfall file is longer than the time the simulation is set up to model.
Tom
To: Thomas J Coulthard
Subject: CAESAR Forum Registration Request
Hi Tom,
I was wondering if you could supply me with a username and password for your CAESAR forum please? I’m having a problem with inputting a large rainfall data text file. I created a 10 year rainfall record as a text file which when inputted into CAESAR works fine. I would like to run a model over a thousand years, so I repeatedly copied and pasted the same ten year record to make a 1280 year record. However, when I input this into CAESAR an error box pops up saying ‘There was some type of error loading the input data from the rain data file CAESAR may continue to function but may not be correct’. You can press ok to this and the model still runs with rainfall and simulates floods, but I’m worried the results might not be correct. Do you know what might have caused this error message and how to fix the problem? Any suggestions would be greatly appreciated.
Many thanks
Lisa |
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