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20 juni 2016
Sensitivity within Waqua models
Edwin Spee, Deltares
Background
• Helpdesk-issue: differences in RMM due to location of RGF-file• Testbank tools: differences in array opdist• Never heard of opdist …• LDS : “It gives for each opening point the distance of the point to
the start of the opening to which it belongs.”• gives a hint: it uses differences between grid coordinates:
d = 4.435234E+05 - 4.436052+05 = -81.8• first guess: may be related to compiler options
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Location boundary points
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43.576
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Array opdist itself
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Difference due to location RGF file
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Simona2016: difference due to RGF file
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Calculation of opdist now in double precision
Difference Simona2015 – Simona2016
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Effect Fp_model on cpu time
Maas (4 cores) Kuststrook (1 core)reference 239.4 639.7Fp_model = strict 240.5 ( + 0.5 %) 646.2 ( + 1 %)
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results for double precision;single precision still to be done.
discussion
• unexpected differences found in RMM model• presentation Werner Kramer: explained by alignment data• hard to get data aligned within Simona (ibuffr 32 bit ; exe 64 bit)• problem with RMM fixed by using double precision in part of
Waqpre.• more code in double precision, gives differences between
Simona2015 and Simona2016.
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