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##############################################################################
#
# Copyright (c) 2003-2018 by The University of Queensland
# http://www.uq.edu.au
#
# Primary Business: Queensland, Australia
# Licensed under the Apache License, version 2.0
# http://www.apache.org/licenses/LICENSE-2.0
#
# Development 2012-2013 by School of Earth Sciences
# Development from 2014 by Centre for Geoscience Computing (GeoComp)
#
##############################################################################
from __future__ import print_function, division
__copyright__="""Copyright (c) 2003-2018 by The University of Queensland
http://www.uq.edu.au
Primary Business: Queensland, Australia"""
__license__="""Licensed under the Apache License, version 2.0
http://www.apache.org/licenses/LICENSE-2.0"""
__url__="https://launchpad.net/escript-finley"
from esys.escript import *
from esys.escript import unitsSI as U
from esys.escript.pdetools import Locator
try:
from esys.weipa import saveSilo
HAVE_SILO = True
except:
HAVE_SILO = False
from esys.downunder import Ricker, TTIWave, SimpleSEGYWriter
from math import ceil
import time
try:
from esys.speckley import Rectangle
HAVE_SPECKLEY=True
except ImportError:
HAVE_SPECKLEY=False
if HAVE_SPECKLEY and HAVE_SILO:
# these are the layers from the top down
layers = [ 400*U.m , 100*U.m , 1.*U.km, ]
v_P= [ 2.86* U.km/U.sec , 1.5 * U.km/U.sec, 2.86 * U.km/U.sec ]
v_S= [ 1.79 * U.km/U.sec , 0.7* U.km/U.sec, 1.8*U.km/U.sec ]
eps = [ 0. , 0.5, 0.1 ]
delta= [ 0. , 0.5 , 0. ]
tilt= [ 0. , 0. , 0. ]
rho= [ 2000 * U.kg/U.m**3 , 2000 * U.kg/U.m**3, 2000 * U.kg/U.m**3 ]
#
# other input:
#
t_end=0.008*U.sec # only this low for testing purposes
frq=10.*U.Hz # dominant frequnce in the Ricker (maximum frequence ~ 2 * frq)
sampling_interval=4*U.msec # sampling interval
ne_z=None # number of elements in vertical direction, if none it is guessed
n_out = 5 # a silo file is created every n_out's sample
absorption_zone=100*U.m # absorbtion zone to be added in horizontal direction to the area covered by receiver line
# and subtracted from the lowest layer.
# defines the receiver line
rangeRcv=800*U.m # width of the receiver line
numRcvPerLine=101 # total number of receivers
src_id=numRcvPerLine//2 # location of source in crossing array lines with in 0..numRcvInLine
lumping = True
src_dir=[0,1]
# domain dimension
width_x=rangeRcv + 4*absorption_zone
depth=sum(layers)
if ne_z is None:
ne_z=int(ceil(depth*(2*frq)/min(v_P)))
if getMPISizeWorld() > 10:
ne_z = 2*ne_z-1
ne_x=int(ceil(ne_z*width_x/depth))
#
# create receiver array
#
receiver_line=[2*absorption_zone + i * (rangeRcv//(numRcvPerLine-1)) for i in range(numRcvPerLine) ]
#
# set source location with tag "source""
#
src_tags=["source"]
src_locations = [ (receiver_line[src_id], depth)]
srcloc=(receiver_line[src_id], 0.)
#
# output
#
print("%s"%(time.asctime(),))
print("ne_x = %s"%(ne_x,))
print("ne_z = %s"%(ne_z,))
print("width = %s m"%(width_x,))
print("depth = %s m"%(depth, ))
print("absorption_zone = %s m"%(absorption_zone, ))
print("sampling interval = %s ms"%(sampling_interval/U.msec,))
print("t_end = %s sec"%(t_end,))
print("ricker dominant freqency = %s Hz"%(frq,))
print("length of receiver line = %s ms"%(rangeRcv,))
print("number of receivers = %s"%(numRcvPerLine,))
print("first receiver location = %s m"%(receiver_line[0],))
print("last receiver location = %s m"%(receiver_line[-1],))
print("source location = %s m"%(src_locations[0][0],))
print("source orientation = %s"%(src_dir,))
print("matrix lumping = %s"%(lumping,))
print("Layer\tV_p\tV_s\teps\tdelta\ttilt\trho")
for i in range(len(layers)):
print("%s\t%s\t%s\t%s\t%s\t%s\t%s"%( layers[i], v_P[i], v_S[i], eps[i], delta[i], tilt[i], rho[i]))
#
# create domain:
#
order = 5
domain=Rectangle(order, ne_x,ne_z, l0=width_x, l1=depth,
diracPoints=src_locations, diracTags=src_tags, d0=getMPISizeWorld())
#
# create the wavelet:
#
wl=Ricker(frq)
#
#======================================================================
#
# set
#
z=ReducedFunction(domain).getX()[1]
z_top=0
V_P=0
V_S=0
Delta=0
Eps=0
Tilt=0
Rho=0
z_top=depth
for l in range(len(layers)):
m=whereNonPositive(z-z_top)*wherePositive(z-(z_top-layers[l]))
V_P = V_P * (1-m) + v_P[l] * m
V_S = V_S * (1-m) + v_S[l] * m
Delta = Delta * (1-m) + delta[l]* m
Eps = Eps * (1-m) + eps[l] * m
Tilt = Tilt * (1-m) + tilt[l] * m
Rho = Rho * (1-m) + rho[l] * m
z_top-=layers[l]
sw=TTIWave(domain, V_P, V_S, wl, src_tags[0], source_vector = src_dir,
eps=Eps, delta=Delta, rho=Rho, theta=Tilt,
absorption_zone=absorption_zone, absorption_cut=1e-2, lumping=lumping)
srclog=Locator(domain, [ (r , depth) for r in receiver_line ] )
grploc=[ (x[0], 0.) for x in srclog.getX() ]
tracer_x=SimpleSEGYWriter(receiver_group=grploc, source=srcloc, sampling_interval=sampling_interval, text='x-displacement')
tracer_z=SimpleSEGYWriter(receiver_group=grploc, source=srcloc, sampling_interval=sampling_interval, text='z-displacement')
if not tracer_x.obspy_available():
print("\nWARNING: obspy not available, SEGY files will not be written\n")
elif getMPISizeWorld() > 1:
print("\nWARNING: SEGY files cannot be written with multiple processes\n")
t=0.
mkDir('output')
n=0
k_out=0
print("calculation starts @ %s"%(time.asctime(),))
while t < t_end:
t,u = sw.update(t+sampling_interval)
tracer_x.addRecord(srclog(u[0]))
tracer_z.addRecord(srclog(u[1]))
print("t=%s, src=%s: \t %s \t %s \t %s"%(t, wl.getValue(t),srclog(u[1])[0], srclog(u[1])[src_id], srclog(u[1])[-1]))
if not n_out is None and n%n_out == 0:
print("time step %s written to file %s"%(n_out, "output/u_%d.silo"%(k_out,)))
try:
saveSilo("output/u_%d.silo"%(k_out,), u=u)
except:
print("Failed saving silo file. Was escript build without Silo support?")
k_out+=1
n+=1
if tracer_x.obspy_available() and getMPISizeWorld() == 1:
tracer_x.write('output/lineX.sgy')
tracer_z.write('output/lineZ.sgy')
print("calculation completed @ %s"%(time.asctime(),))
else: # no speckley
print("The Speckley module is not available")
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