source: anuga_validation/okushiri_2005/create_okushiri.py @ 3895

Last change on this file since 3895 was 3895, checked in by ole, 17 years ago

Work on okushiri (smaller mesh)

File size: 5.7 KB
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1"""Create mesh and time boundary for the Okushiri island validation
2"""
3
4
5from Numeric import array, zeros, Float, allclose
6
7from anuga.pmesh.mesh import *
8from anuga.pmesh.mesh_interface import create_mesh_from_regions
9from anuga.coordinate_transforms.geo_reference import Geo_reference
10from anuga.geospatial_data import Geospatial_data
11
12import project
13
14def prepare_bathymetry(filename):
15    """Convert benchmark 2 bathymetry to NetCDF pts file.
16    This is a 'throw-away' code taylor made for files like
17    'Benchmark_2_bathymetry.txt' from the LWRU2 benchmark
18    """
19
20    print 'Creating', filename
21   
22    # Read the ascii (.txt) version of this file,
23    # make it comma separated and invert the bathymetry
24    # (Below mean sea level should be negative)
25    infile = open(filename[:-4] + '.txt')
26
27    points = []
28    attribute = []
29    for line in infile.readlines()[1:]: #Skip first line (the header)
30        fields = line.strip().split()
31
32        x = float(fields[0])
33        y = float(fields[1])
34        z = -float(fields[2]) # Bathymetry is inverted in original file
35       
36        points.append([x,y])
37        attribute.append(z)
38    infile.close()
39
40    # Convert to geospatial data and store as NetCDF
41    G = Geospatial_data(data_points=points,
42                        attributes=attribute)
43    G.export_points_file(filename)
44   
45
46
47def prepare_timeboundary(filename):
48    """Convert benchmark 2 time series to NetCDF tms file.
49    This is a 'throw-away' code taylor made for files like
50    'Benchmark_2_input.txt' from the LWRU2 benchmark
51    """
52
53    from Scientific.IO.NetCDF import NetCDFFile
54    from Numeric import array
55
56
57    print 'Creating', filename
58
59    # Read the ascii (.txt) version of this file
60    fid = open(filename[:-4] + '.txt')
61
62    # Skip first line
63    line = fid.readline()
64
65    # Read remaining lines
66    lines = fid.readlines()
67    fid.close()
68
69
70    N = len(lines)
71    T = zeros(N, Float)  #Time
72    Q = zeros(N, Float)  #Values
73
74    for i, line in enumerate(lines):
75        fields = line.split()
76
77        T[i] = float(fields[0])
78        Q[i] = float(fields[1])
79
80
81    # Create tms NetCDF file
82
83    fid = NetCDFFile(filename, 'w')
84    fid.institution = 'Geoscience Australia'
85    fid.description = 'Input wave for Benchmark 2'
86    fid.starttime = 0.0
87    fid.createDimension('number_of_timesteps', len(T))
88    fid.createVariable('time', Float, ('number_of_timesteps',))
89    fid.variables['time'][:] = T
90
91    fid.createVariable('stage', Float, ('number_of_timesteps',))
92    fid.variables['stage'][:] = Q[:]
93
94    fid.createVariable('xmomentum', Float, ('number_of_timesteps',))
95    fid.variables['xmomentum'][:] = 0.0
96
97    fid.createVariable('ymomentum', Float, ('number_of_timesteps',))
98    fid.variables['ymomentum'][:] = 0.0
99
100    fid.close()
101
102
103#-------------------------------------------------------------
104if __name__ == "__main__":
105
106
107    # Prepare bathymetry
108    prepare_bathymetry(project.bathymetry_filename)
109
110    # Prepare time boundary
111    prepare_timeboundary(project.boundary_filename)
112
113
114    #--------------------------------------------------------------------------
115    # Create the triangular mesh based on overall clipping polygon with a
116    # tagged
117    # boundary and interior regions defined in project.py along with
118    # resolutions (maximal area of per triangle) for each polygon
119    #--------------------------------------------------------------------------
120
121
122    base_resolution = 1 # Use this to coarsen or refine entire mesh.
123
124    # Basic geometry and bounding polygon
125    xleft   = 0
126    xright  = 5.448
127    ybottom = 0
128    ytop    = 3.402
129
130    point_sw = [xleft, ybottom]
131    point_se = [xright, ybottom]
132    point_nw = [xleft, ytop]   
133    point_ne = [xright, ytop]
134
135    bounding_polygon = [point_se,
136                        point_ne,
137                        point_nw,
138                        point_sw]
139   
140
141    # Localised refined area for gulleys
142    xl = 4.8
143    xr = 5.3
144    yb = 1.6
145    yt = 2.3
146    p0 = [xl, yb]
147    p1 = [xr, yb]
148    p2 = [xr, yt]
149    p3 = [xl, yt]
150   
151    gulleys = [p0, p1, p2, p3]
152   
153
154    # Island area and drawdown region
155    island_0 = [xleft + 2*(xright-xleft)/3+1.2, ytop-0.5]
156    island_1 = [xleft + 2*(xright-xleft)/3+0.5, ybottom + 2*(ytop-ybottom)/3]
157    island_2 = [xleft + (xright-xleft)/2+0.3, ybottom + 2*(ytop-ybottom)/3-0.3]
158    island_3 = [xleft + (xright-xleft)/2+0.3, ybottom + (ytop-ybottom)/3+0.3]
159    island_4 = [xleft + 2*(xright-xleft)/3+0.4, ybottom + (ytop-ybottom)/3-0.3]
160    island_5 = [xleft + 2*(xright-xleft)/3+1.2, ybottom+0.2]
161    island_6 = [xl-.01, yb]  # Keep right edge just off the gulleys
162    island_7 = [xl-.01, yt]
163 
164    island = [island_0, island_1, island_2,
165              island_3, island_4, island_5,
166              island_6, island_7]
167
168
169    # Region spanning half right hand side of domain just inside boundary
170    rhs_nw = [xleft + (xright-xleft)/3+1, ytop-0.4]
171    rhs_sw = [xleft + (xright-xleft)/3+1, ybottom+0.4]
172    rhs_se = [xright-0.1, ybottom+0.1]
173    rhs_ne = [xright-0.1, ytop-0.1]   
174
175    rhs_region = [rhs_nw, rhs_ne, rhs_se, rhs_sw]
176
177
178   
179    # Interior regions and creation of mesh
180    interior_regions = [[rhs_region, 0.0005],
181                        [gulleys, 0.00002*base_resolution],
182                        [island, 0.00007*base_resolution]] 
183
184    meshname = project.mesh_filename + '.msh'
185    m = create_mesh_from_regions(bounding_polygon,
186                                 boundary_tags={'wall': [0, 1, 3],
187                                                'wave': [2]},     
188                                 maximum_triangle_area=0.1*base_resolution,
189                                 interior_regions=interior_regions,
190                                 filename=project.mesh_filename,
191                                 use_cache=True,
192                                 verbose=True)
193
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