source: anuga_work/development/convergence_okushiri_2008/README.txt @ 6409

Last change on this file since 6409 was 5720, checked in by Leharne, 17 years ago

Updates to okushiri convergence study

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1ANUGA CONVERGENCE STUDY USING TRUE-SCALE VERSION OF THE
2OKUSHIRI ISLAND TSUNAMI WAVETANK EXPERIMENT
3
4This directory currently contains code to scale-up to true scale, the 1:400
5wave tank simulation of the 1993 Okushiri island tsunami as described at
6the Third International Conference on Long Wave Runup:
7http://www.cee.cornell.edu/longwave/index.cfm?page=benchmark&problem=2.
8
9The "up-scaled" files are then used for conducting a convergence study
10in ANUGA.
11
12Data files available in this directory are
13
14okushiri_truescale_bathymetry.txt:
15  The true-scale digital elevation model
16
17okushiri_truescale_input.txt:
18  The true-scale timeseries applied at the western boundary   
19
20okushiri_output_truescale_ch5-7-9.txt:
21  Experimental data measured at three gauge locations in the original wavetank experiment
22  which has been up-scaled to true-scale
23
24
25The ANUGA scripts to run are
26
27project_truescale.py:
28  This script contains project filenames and is called in the create and run scripts below.
29
30create_okushiri_truescale.py:
31  This script will convert the text files to native
32  ANUGA netcdf formats and also create a suitable triangular mesh.
33 
34run_okushiri_truescale.py:
35  This script will run a numerical simulation based on the the bathymetry
36  and the given boundary condition and store the model output in an ANUGA
37  sww file which can be viewed using animate, or further interrogated by ANUGA.
38     
39compare_timeseries.py
40  This script will extract timeseries from the sww file and plot them
41  together with the experimental data provided. Numerical similarity
42  measures will also be computed.
43 
44get_timeseries.py
45  This script extracts timeseries from the sww file and writes them to individual
46  csv files for each gauge location.
47
48export_results.py
49  This script extracts a number of variables from the sww file (for eg stage,
50  depth, momentum) in three regions at three different but fixed regular grid
51  resolutions (at either discrete time indices or maximised over the whole
52  simulation).
53
54Methodology for true-scale transformation:
55
56Positions (ie bathymetry, polygon definitions, gauge locations) were derived by
57carrying out a scalar multiplication of all x, y, z values in the original files by 400.
58
59Input waveform: Truescale input wave with period T' is assumed to have a wavelength
60and amplitude 400 times the original 1:400 waveform. Given the relationship:
61
62T = wavelength / sqrt (g * h)
63
64Then T' = 400 * wavelength / sqrt (g * 400 * h)
65           = 20 * wavelength / sqrt (g * h)
66           = 20 * T
67
68Therefore, time (s) is multiplied by 20 and water surface (m) (ie amplitude) is multiplied by 400.
69
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