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change_friction_operator.py
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change_friction_operator.py
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"""
Erosion operators
"""
from __future__ import print_function
__author__="steve"
__date__ ="$09/03/2012 4:46:39 PM$"
from anuga import Domain
from anuga import Quantity
import numpy as num
import anuga.utilities.log as log
from anuga.geometry.polygon import inside_polygon
from anuga.operators.base_operator import Operator
from anuga.fit_interpolate.interpolate import Modeltime_too_early, \
Modeltime_too_late
from anuga import indent
class Erosion_operator(Operator):
"""
Simple erosion operator in a region (careful to maintain continuitiy of elevation)
indices: None == all triangles, Empty list [] no triangles
rate can be a function of time.
"""
def __init__(self,
domain,
threshold= 0.0,
indices=None,
description = None,
label = None,
logging = False,
verbose = False):
Operator.__init__(self, domain, description, label, logging, verbose)
#------------------------------------------
# Local variables
#------------------------------------------
self.threshold = threshold
self.indices = indices
def __call__(self):
"""
Apply rate to those triangles defined in indices
indices == [], then don't apply anywhere
indices is None, then apply everywhere
otherwise apply for the specific indices
"""
if self.indices is []:
return
#elevation = self.get_elevation()
# if self.verbose is True:
# log.critical('Bed of %s at time = %.2f = %f'
# % (self.quantity_name, domain.get_time(), elevation))
#if self.indices is None:
# self.elev_c[:] = elevation
#else:
# self.elev_c[self.indices] = elevation
t = self.get_time()
dt = self.get_timestep()
self.elev_v = self.domain.quantities['elevation'].vertex_values
self.stage_v = self.domain.quantities['stage'].vertex_values
# Need to store water heights before change to ensure
# no water lost or produced
height_c = self.stage_c - self.elev_c
#--------------------------------------------
# Here we do the actual erosion
#--------------------------------------------
if self.indices is None:
self.elev_v[:] = self.elev_v + 0.0
else:
self.elev_v[self.indices] -= 0.1*dt
# FIXME SR: At present need to ensure the elevation is continuous
# In future with discontinuous bed we will not need to do this.
self.domain.quantities['elevation'].smooth_vertex_values()
self.domain.quantities['elevation'].interpolate()
#self.elev_c = self.domain.quantities['elevation'].centroid_values
# # Fix up water conservation
self.stage_c[:] = self.elev_c + height_c
# self.domain.distribute_to_vertices_and_edges()
print('time in erosion ',self.get_time(), dt)
def parallel_safe(self):
"""Operator is applied independently on each cell and
so is parallel safe.
"""
return False
def statistics(self):
message = self.label + ': Erosion_operator'
message = message + ' on triangles '+ str(self.indices)
return message
def timestepping_statistics(self):
message = indent + self.label + ': Erosion_operator'
return 'test'
#===============================================================================
# Specific Erosion Operator for circular region.
#===============================================================================
class Circular_erosion_operator(Erosion_operator):
"""
Erosion over a circular region
"""
def __init__(self, domain,
threshold=0.0,
center=None,
radius=None,
verbose=False):
assert center is not None
assert radius is not None
# Determine indices in update region
N = domain.get_number_of_triangles()
points = domain.get_centroid_coordinates(absolute=True)
indices = []
c = center
r = radius
self.center = center
self.radius = radius
intersect = False
for k in range(N):
x, y = points[k,:] # Centroid
if ((x-c[0])**2+(y-c[1])**2) < r**2:
intersect = True
indices.append(k)
msg = 'No centroids intersect circle center'+str(center)+' radius '+str(radius)
assert intersect, msg
# It is possible that circle doesn't intersect with mesh (as can happen
# for parallel runs
Erosion_operator.__init__(self,
domain,
threshold,
indices=indices,
verbose=verbose)
#===============================================================================
# Specific Bed Operators for polygonal region.
#===============================================================================
class Polygonal_erosion_operator(Erosion_operator):
"""
Erosion over a ploygon
"""
def __init__(self, domain,
threshold=0.0,
polygon=None,
verbose=False):
# Determine indices in update region
N = domain.get_number_of_triangles()
points = domain.get_centroid_coordinates(absolute=True)
indices = inside_polygon(points, polygon)
self.polygon = polygon
# It is possible that circle doesn't intersect with mesh (as can happen
# for parallel runs
Erosion_operator.__init__(self,
domain,
threshold=threshold,
indices=indices,
verbose=verbose)