def calculate(mouth_dict, basin, load, traveltime, sumtime, avgtime, sumload):
'''
This function calculates the the sum and the average of the product of residence_time and load.
This must be an index for the travel time of the load in a river basin.
sumtime,avgtime and sumload are attributes which are in mouth_dict. They must be given as text.
'''
loadtime = ascraster.duplicategrid(traveltime)
# Calculate the travel time for the N load
loadtime.multiply(load, default_nodata_value=0.0)
# Check whether sumtime is a valid attribute of the mouth_dict dictionairy.
for key in list(mouth_dict.keys()):
try:
sumtime_riv = getattr(mouth_dict[key], sumtime)
except AttributeError:
# Make attribute in the mouth_dict dictionary
setattr(mouth_dict[key], sumtime, 0.0)
# Aggregate traveltime over the river basin.
aggregate.aggregate_grid(basin, loadtime, mouth_dict, item=sumtime)
# Calculate the average traveltime for each river basin
for key in list(mouth_dict.keys()):
try:
sumtime_riv = getattr(mouth_dict[key], sumtime)
sumload_riv = getattr(mouth_dict[key], sumload)
setattr(mouth_dict[key], avgtime, sumtime_riv / sumload_riv)
except ZeroDivisionError:
setattr(mouth_dict[key], avgtime, 0.0)
def calculate(mouth_dict, basin, load, traveltime, sumtime, avgtime, sumload):
"""
This function calculates the the sum and the average of the product of residence_time and load.
This must be an index for the travel time of the load in a river basin.
sumtime,avgtime and sumload are attributes which are in mouth_dict. They must be given as text.
"""
loadtime = ascraster.duplicategrid(traveltime)
# Calculate the travel time for the N load
loadtime.multiply(load, default_nodata_value=0.0)
# Check whether sumtime is a valid attribute of the mouth_dict dictionairy.
for key in mouth_dict.keys():
try:
sumtime_riv = getattr(mouth_dict[key], sumtime)
except AttributeError:
# Make attribute in the mouth_dict dictionary
setattr(mouth_dict[key], sumtime, 0.0)
# Aggregate traveltime over the river basin.
aggregate.aggregate_grid(basin, loadtime, mouth_dict, item=sumtime)
# Calculate the average traveltime for each river basin
for key in mouth_dict.keys():
try:
sumtime_riv = getattr(mouth_dict[key], sumtime)
sumload_riv = getattr(mouth_dict[key], sumload)
setattr(mouth_dict[key], avgtime, sumtime_riv / sumload_riv)
except ZeroDivisionError:
setattr(mouth_dict[key], avgtime, 0.0)
def calculate(params, mask, mouth_dict, lake_icell_dict, basin, discharge,
lddmap, Pload):
'''
This function calculates the retention in the grid cells.
'''
# Read in the PCGLOBWB files
water_storage_file = params.water_storage
water_storage = ascraster.Asciigrid(ascii_file=water_storage_file,\
mask=mask,numtype=float)
flooding_depth_file = params.flooding_depth
flooding_depth = ascraster.Asciigrid(ascii_file=flooding_depth_file,\
mask=mask,numtype=float)
flooding_fraction = ascraster.Asciigrid(ascii_file=params.flooding_fraction,\
mask=mask,numtype=float)
fraction_water_grid = ascraster.Asciigrid(ascii_file=params.fraction_water,\
mask=mask,numtype=float)
cellarea_grid = ascraster.Asciigrid(ascii_file=params.cellarea,\
mask=mask,numtype=float)
lakeid_grid = ascraster.Asciigrid(ascii_file=params.lakeid,\
mask=mask,numtype=int)
outlakeid_grid = ascraster.Asciigrid(ascii_file=params.outlakeid,\
mask=mask,numtype=int)
water_area_grid = ascraster.Asciigrid(ascii_file=params.water_area,\
mask=mask,numtype=int)
# Water volume flooding area
volume_flooding_grid = ascraster.duplicategrid(flooding_depth)
volume_flooding_grid.multiply(flooding_fraction, default_nodata_value=0.0)
volume_flooding_grid.multiply(cellarea_grid, default_nodata_value=0.0)
volume_flooding_grid.write_ascii_file(
os.path.join(params.outputdir, "volume_flooding_grid.asc"))
# Water volume of river.
volume_river_grid = ascraster.duplicategrid(water_storage)
volume_river_grid.write_ascii_file(
os.path.join(params.outputdir, "volume_river_grid.asc"))
# Area water of river.
area_river_grid = ascraster.duplicategrid(cellarea_grid)
area_river_grid.multiply(fraction_water_grid, default_nodata_value=0.0)
area_river_grid.write_ascii_file(
os.path.join(params.outputdir, "area_river_grid.asc"))
# Correct river volume and area when there is a reservoir or a lake.
for icell in range(lakeid_grid.length):
id = lakeid_grid.get_data(icell, -1)
if (id > 0):
# It is a lake or reservoir
# Check whether it is a outlet of a lake or reservoir
id = outlakeid_grid.get_data(icell, -1)
if (id > 0):
# It is an outlet. So put lake properties into the gridcell
volume_river_grid.set_data(icell,
water_storage.get_data(icell, 0.0))
area_river_grid.set_data(icell,
water_area_grid.get_data(icell, 0.0))
else:
# It is not an outlet. So remove the calculated river properties.
volume_river_grid.set_data(icell, 0.0)
area_river_grid.set_data(icell, 0.0)
volume_river_grid.write_ascii_file(
os.path.join(params.outputdir, "volume_river_grid_with_lakes.asc"))
area_river_grid.write_ascii_file(
os.path.join(params.outputdir, "area_river_grid_with_lakes.asc"))
# Depth water of river in metres
depth_river_grid = ascraster.duplicategrid(volume_river_grid)
depth_river_grid.divide(area_river_grid, default_nodata_value=0.0)
depth_river_grid.write_ascii_file(
os.path.join(params.outputdir, "depth_river_grid.asc"))
# Change water_storage from m3 into km3
volume_river_grid.multiply(1.0e-9)
volume_flooding_grid.multiply(1.0e-9)
# Residence time is the volume divided by discharge.
# Water storage is in km3. Discharge is km3/yr. So residence time is in years.
residence_time_river_grid = ascraster.duplicategrid(volume_river_grid)
residence_time_flooding_grid = ascraster.duplicategrid(
volume_flooding_grid)
# Calculate residence times by dividing water_storage through discharge.
residence_time_river_grid.divide(discharge, default_nodata_value=0.0)
residence_time_flooding_grid.divide(
discharge,
default_nodata_value=0.0,
maximum=params.max_residence_time_per_cell)
# If residence times are very high (e.g in dry areas),
# set the residence time to a maximum
# Apply maximum on gridcells which are not the outlet of a reservoir or lake.
# In the flooding map there are no lakes/reservoirs
for icell in range(residence_time_river_grid.length):
resi = residence_time_river_grid.get_data(icell, -1)
if (resi > params.max_residence_time_per_cell):
# Check whether this is a outlet of a lake or reservoir
try:
outcell = lake_icell_dict[icell].outcell
if (outcell == 1):
# Outlet of a lake/reservoir
if (resi > params.max_residence_time_per_lake):
resi = params.max_residence_time_per_lake
else:
resi = params.max_residence_time_per_cell
residence_time_river_grid.set_data(icell, resi)
except KeyError:
# This is no reservoir or lake
residence_time_river_grid.set_data(
icell, params.max_residence_time_per_cell)
residence_time_river_grid.write_ascii_file(
os.path.join(params.outputdir, "residence_time_river_grid.asc"))
residence_time_flooding_grid.write_ascii_file(
os.path.join(params.outputdir, "residence_time_flooding_grid.asc"))
# Put residence time of the water body (lakes and reservoirs) in the grid.
for icell in lake_icell_dict:
if (lake_icell_dict[icell].outcell == 1):
lake_icell_dict[
icell].residence_time = residence_time_river_grid.get_data(
icell, 0.0)
# Calculate the water volume in the grid cell
volume_grid = ascraster.duplicategrid(volume_flooding_grid)
volume_grid.add(volume_river_grid, default_nodata_value=0.0)
volume_grid.write_ascii_file(
os.path.join(params.outputdir, "volume_grid.asc"))
# Calculate the average residence time with as weighing factors the volumes of the flooding - river
residence_time_grid = ascraster.duplicategrid(volume_river_grid)
residence_time_grid.multiply(residence_time_river_grid,
default_nodata_value=0.0)
temp_grid = ascraster.duplicategrid(volume_flooding_grid)
temp_grid.multiply(residence_time_flooding_grid, default_nodata_value=0.0)
residence_time_grid.add(temp_grid, default_nodata_value=0.0)
residence_time_grid.divide(volume_grid, default_nodata_value=0.0)
del temp_grid
# Write residence_time to output file:
residence_time_grid.write_ascii_file(
os.path.join(params.outputdir, "residence_time.asc"))
# Calculate the travel time of each grid cell to the river mouth
traveltime = accuflux.accutime(lddmap, residence_time_grid,
lake_icell_dict)
traveltime.write_ascii_file(
os.path.join(params.outputdir, "traveltime.asc"))
# Aggregate traveltime over the river basin.
aggregate.aggregate_grid(basin,
traveltime,
mouth_dict,
item="sum_traveltime")
# Calculate the average traveltime for each river basin
for key in list(mouth_dict.keys()):
try:
mouth_dict[key].avg_traveltime = mouth_dict[
key].sum_traveltime / mouth_dict[key].number_of_cells
except ZeroDivisionError:
mouth_dict[key].avg_traveltime = 0.0
except AttributeError:
pass
# Calculate the hydraulic load (Hl = depth/residence_time)
hydraulic_load_flooding_grid = ascraster.duplicategrid(flooding_depth)
hydraulic_load_flooding_grid.divide(residence_time_flooding_grid,
default_nodata_value=0.0)
hydraulic_load_river_grid = ascraster.duplicategrid(depth_river_grid)
hydraulic_load_river_grid.divide(residence_time_river_grid,
default_nodata_value=0.0)
hydraulic_load_river_grid.write_ascii_file(
os.path.join(params.outputdir, "hydraulic_load_river.asc"))
hydraulic_load_flooding_grid.write_ascii_file(
os.path.join(params.outputdir, "hydraulic_load_flooding.asc"))
# Calculate the average hydraulic load with as weighing factors the volumes of the flooding - river
hydraulic_load_grid = ascraster.duplicategrid(volume_river_grid)
hydraulic_load_grid.multiply(hydraulic_load_river_grid,
default_nodata_value=0.0)
temp_grid = ascraster.duplicategrid(volume_flooding_grid)
temp_grid.multiply(hydraulic_load_flooding_grid, default_nodata_value=0.0)
hydraulic_load_grid.add(temp_grid, default_nodata_value=0.0)
hydraulic_load_grid.divide(volume_grid, default_nodata_value=0.0)
del temp_grid
# Write hydraulic load to output file:
hydraulic_load_grid.write_ascii_file(
os.path.join(params.outputdir, "hydraulic_load.asc"))
temperature_grid = ascraster.Asciigrid(ascii_file=params.water_temperature,\
mask=mask,numtype=float)
# Read endoreic lakes
endo_lakes_grid = ascraster.Asciigrid(ascii_file=params.endo_lakes,\
mask=mask,numtype=int)
# Calculate the retention for rivers.
retention_river_grid = ascraster.duplicategrid(volume_river_grid)
for icell in range(retention_river_grid.length):
id = endo_lakes_grid.get_data(icell, 0)
if (id > 0):
# This is an endoreic lake. So the calculation
retention_river_grid.set_data(icell, 1.0)
continue
vol = volume_river_grid.get_data(icell, -1)
if (vol > 0):
temperature = temperature_grid.get_data(icell, 20.0)
hydraulic_load = hydraulic_load_river_grid.get_data(icell, 0.0)
ret = calculate_retention(params, hydraulic_load, vol, temperature)
retention_river_grid.set_data(icell, ret)
else:
retention_river_grid.set_data(icell, 0.0)
# Calculate the retention for flood planes.
retention_flooding_grid = ascraster.duplicategrid(volume_flooding_grid)
for icell in range(retention_flooding_grid.length):
vol = volume_flooding_grid.get_data(icell, -1)
if (vol > 0):
temperature = temperature_grid.get_data(icell, 20.0)
hydraulic_load = hydraulic_load_flooding_grid.get_data(icell, 0.0)
ret = calculate_retention(params, hydraulic_load, vol, temperature)
retention_flooding_grid.set_data(icell, ret)
else:
retention_flooding_grid.set_data(icell, 0.0)
# Calculate the average retention with as weighing factors the volumes of the flooding - river
retention_grid = ascraster.duplicategrid(volume_river_grid)
retention_grid.multiply(retention_river_grid, default_nodata_value=0.0)
temp_grid = ascraster.duplicategrid(volume_flooding_grid)
temp_grid.multiply(retention_flooding_grid, default_nodata_value=0.0)
retention_grid.add(temp_grid, default_nodata_value=0.0)
retention_grid.divide(water_storage, default_nodata_value=0.0)
del temp_grid
# Set the lake database
for icell in range(outlakeid_grid.length):
if (id > 0):
# It is an outlet. So put lake properties into the gridcell
# Recalculate the temperature
temp = 0.0
number_of_cells = len(lake_icell_dict[icell].cells)
for item in range(number_of_cells):
icell_lake = lake_icell_dict[icell].cells[item]
temp += temperature.get_data(icell_lake, 0.0)
# Take average over the cells.
temperature_cell = temp / float(number_of_cells)
ret_cell = retention_river_grid.get_data(icell, 0.0)
setattr(lake_icell_dict[icell], "retention", ret_cell)
setattr(lake_icell_dict[icell], "fraction_water", -99)
setattr(lake_icell_dict[icell], "temperature", temperature_cell)
accuPload = P_accuflux(params, mask, lake_icell_dict, lddmap, Pload,
retention_grid)
return residence_time_grid, traveltime, retention_grid, accuPload, hydraulic_load_grid
def calculate(params, mask, mouth_dict, basin):
"""
Calculates the area of each grass and arable land use cell.
It returns two ascraster object with the area grass and area arable land in ha
"""
# Read grass files
gras1 = ascraster.Asciigrid(ascii_file=params.pgrass, mask=mask, numtype=float)
if params.ldebug:
print params.pgrass + " has been read."
gras2 = ascraster.Asciigrid(ascii_file=params.igrass, mask=mask, numtype=float)
if params.ldebug:
print params.igrass + " has been read."
# Read crop files
crop1 = ascraster.Asciigrid(ascii_file=params.cropmixp, mask=mask, numtype=float)
if params.ldebug:
print params.cropmixp + " has been read."
crop2 = ascraster.Asciigrid(ascii_file=params.croppasp, mask=mask, numtype=float)
if params.ldebug:
print params.croppasp + " has been read."
# Read land area
landarea = ascraster.Asciigrid(ascii_file=params.landarea, mask=mask, numtype=float)
if params.ldebug:
print params.landarea + " has been read."
# Aggregate landarea on river basin scale
aggregate.aggregate_grid(basin, landarea, mouth_dict, item="landarea")
# Make a copy (alias not a deepcopy) of the return values
area_grass = gras1
area_crop = crop1
area_natural = landarea
# Calculate the total grass and crop land in ha. Because the LU file are in percentage, and the
# landarea is in km2, the product of (crop1_cell+crop2_cell) * landarea_cell is then in ha.
for icell in range(crop1.length):
crop1_cell = crop1.get_data(icell, 0.0)
crop2_cell = crop2.get_data(icell, 0.0)
gras1_cell = gras1.get_data(icell, 0.0)
gras2_cell = gras2.get_data(icell, 0.0)
landarea_cell = landarea.get_data(icell, 0.0)
# Put result in crop1 and gras1
crop_area = landarea_cell * (crop1_cell + crop2_cell)
gras_area = landarea_cell * (gras1_cell + gras2_cell)
if (crop_area + gras_area) - (100.0 * landarea_cell) > params.epsilon:
print "Crop and grass area is too large: ", crop_area + gras_area, 100.0 * landarea_cell, (
crop_area + gras_area
) - (100.0 * landarea_cell)
try:
fac = (100 * landarea_cell) / (crop_area + gras_area)
except ZeroDivisionError:
fac = 0.0
crop_area *= fac
gras_area *= fac
nat_area = max(0.0, (100.0 * landarea_cell) - crop_area - gras_area)
# Put result in the maps in km2 (factor 0.01)
area_crop.set_data(icell, 0.01 * crop_area)
area_grass.set_data(icell, 0.01 * gras_area)
area_natural.set_data(icell, 0.01 * nat_area)
# Aggregate landarea on river basin scale
aggregate.aggregate_grid(basin, area_crop, mouth_dict, item="croparea")
aggregate.aggregate_grid(basin, area_grass, mouth_dict, item="grasarea")
aggregate.aggregate_grid(basin, area_natural, mouth_dict, item="natarea")
# Calculate the number of cells in a region/basin
one = ascraster.duplicategrid(landarea)
# Set all cells to one.
one.add_values(one.length * [1.0])
aggregate.aggregate_grid(basin, one, mouth_dict, item="number_of_cells")
# Delete the grid objects which are used anymore
del crop1
del crop2
del gras1
del gras2
del landarea
del one
return area_grass, area_crop, area_natural
def calculate_subgrid_retention(params,mask,mouth_dict,basin,lake_icell_dict,load,\
water_body,pnet,vf):
'''
The subgrid retention is based on Wollheim (2006, GBC). This method is based on the stream order.
In each cell, which is not a lake or reservoir, the subgrid retention is calculated.
Only the local situation is used. For the load only the diffuse source from this cell are used.
The runoff is used (so only local water). Also the concentration effect or temperature effect on retention is not used here.
'''
# Make the subgrid stream order properties.
# Setup the stream order river length,area and distribution and flowpath. Everything is stored in params.
define_subgrid_streamorder(params)
# Set the relation between concentration and net uptake velocity
try:
accuflux_retention.set_conc_relation_retention(params)
except AttributeError:
# This function is only for N and not for P
pass
# Make output rasters
load_grid = ascraster.duplicategrid(load)
retention = ascraster.duplicategrid(load)
# Make nodata on all cells.
retention.add_values(retention.length*[retention.nodata_value])
retentionload = ascraster.duplicategrid(retention)
# Read water temperature
temperature = ascraster.Asciigrid(ascii_file=params.water_temperature,mask=mask,numtype=float)
# Loop over all cells:
for icell in range(load_grid.length):
# Get mass flux at the cell.
load_cell = load_grid.get_data(icell)
if (load_cell == None):
# No data value
continue
if load_cell < 0.0:
print("Negative mass flow of " + str(load_cell) + " at cell: " + str(icell))
# Go to next cell.
continue
# Retention in cell
water_body_cell = water_body.get_data(icell,0)
if (water_body_cell > 0):
runoff_cell = pnet.get_data(icell,0.0)
# Check whether this cell is an outflow of a lake/reservoir
try:
loutflow = lake_icell_dict[icell].outcell
except KeyError:
# No lake or reservoir
loutflow = -1
try:
if (loutflow == -1):
# Normal cell, no lake or reservoir.
# Default temperature of 20C because then temperature has no effect.
temperature_cell = temperature.get_data(icell,20.0)
ret_cell = calculate_localretention(params,runoff_cell,vf,load_cell,temperature_cell)
else:
#TODO: local retention when it is a lake or reservoir. For example as normal retention * fr_land.
# Lake or reservoir.
ret_cell = 0.0
except OverflowError:
raise OverflowError
else:
ret_cell = 0.0
# Fill retention grid with retention value and retention load
retention.set_data(icell,ret_cell)
retentionload.set_data(icell,load_cell*ret_cell)
# Write to output files
retention.write_ascii_file(os.path.join(params.outputdir,"retention_subgrid.asc"))
retentionload.write_ascii_file(os.path.join(params.outputdir,"removed_subgridload.asc"))
# Write in mouth_dict database
aggregate.aggregate_grid(basin,retentionload,mouth_dict,item="retentionload_subgrid")
aggregate.aggregate_grid(basin,load_grid,mouth_dict,item="subgrid_load")
# Put the retention_subgrid of the river in the mouth database
for key in list(mouth_dict.keys()):
try:
mouth_dict[key].retention_subgrid = mouth_dict[key].retentionload_subgrid/mouth_dict[key].subgrid_load
except ZeroDivisionError:
mouth_dict[key].retention_subgrid = 0.0
return retentionload,retention
def calculate(params,mask,mouth_dict,lake_icell_dict,basin,discharge,lddmap):
'''
This function calculates the residence time in the grid cells.
'''
# Read in the PCGLOBWB files
water_storage_file = params.water_storage
water_storage = ascraster.Asciigrid(ascii_file=water_storage_file,\
mask=mask,numtype=float)
# Change water_storage from m3 into km3
water_storage.multiply(1.0e-9)
# Residence time is the volume divided by discharge.
# Water storage is in km3. Discharge is km3/yr. So residence time is in years.
residence_time_grid = ascraster.duplicategrid(water_storage)
# Calculate residence times by dividing water_storage through discharge.
residence_time_grid.divide(discharge,default_nodata_value = 0.0)
# If residence times are very high (e.g in dry areas),
# set the residence time to a maximum
# Apply maximum on gridcells which are not the outlet of a reservoir or lake.
for icell in xrange(residence_time_grid.length):
resi = residence_time_grid.get_data(icell,-1)
if (resi > params.max_residence_time_per_cell):
# Check whether this is a outlet of a lake or reservoir
try:
outcell = lake_icell_dict[icell].outcell
if (outcell == 1):
# Outlet of a lake/reservoir
if (resi > params.max_residence_time_per_lake):
resi = params.max_residence_time_per_lake
# Change also the dictionary value of this waterbody
lake_icell_dict[icell].residence_time = resi
else:
resi = params.max_residence_time_per_cell
residence_time_grid.set_data(icell,resi)
except KeyError:
# This is no reservoir or lake
residence_time_grid.set_data(icell,params.max_residence_time_per_cell)
# Put residence time of the water body (lakes and reservoirs) in the grid.
for icell in lake_icell_dict:
if (lake_icell_dict[icell].outcell == 1):
residence_time_grid.set_data(icell,lake_icell_dict[icell].residence_time)
# Write residence_time to output file:
residence_time_grid.write_ascii_file(os.path.join(params.outputdir,"residence_time.asc"))
# Calculate the travel time of each grid cell to the river mouth
traveltime = accuflux.accutime(lddmap,residence_time_grid,lake_icell_dict)
traveltime.write_ascii_file(os.path.join(params.outputdir,"traveltime.asc"))
# Aggregate traveltime over the river basin.
aggregate.aggregate_grid(basin,traveltime,mouth_dict,item="sum_traveltime")
# Calculate the average traveltime for each river basin
for key in mouth_dict.keys():
try:
mouth_dict[key].avg_traveltime = mouth_dict[key].sum_traveltime/mouth_dict[key].number_of_cells
except ZeroDivisionError:
mouth_dict[key].avg_traveltime = 0.0
except AttributeError:
pass
return residence_time_grid,traveltime
def calculate(params, mask, mouth_dict, basin):
'''
Calculates the area of each grass and arable land use cell.
It returns two ascraster object with the area grass and area arable land in ha
'''
# Read grass files
gras1 = ascraster.Asciigrid(ascii_file=params.pgrass,
mask=mask,
numtype=float)
if params.ldebug: print(params.pgrass + " has been read.")
gras2 = ascraster.Asciigrid(ascii_file=params.igrass,
mask=mask,
numtype=float)
if params.ldebug: print(params.igrass + " has been read.")
# Read crop files
crop1 = ascraster.Asciigrid(ascii_file=params.cropmixp,
mask=mask,
numtype=float)
if params.ldebug: print(params.cropmixp + " has been read.")
crop2 = ascraster.Asciigrid(ascii_file=params.croppasp,
mask=mask,
numtype=float)
if params.ldebug: print(params.croppasp + " has been read.")
# Read land area
landarea = ascraster.Asciigrid(ascii_file=params.landarea,
mask=mask,
numtype=float)
if params.ldebug: print(params.landarea + " has been read.")
# Aggregate landarea on river basin scale
aggregate.aggregate_grid(basin, landarea, mouth_dict, item="landarea")
# Make a copy (alias not a deepcopy) of the return values
area_grass = gras1
area_crop = crop1
area_natural = landarea
# Calculate the total grass and crop land in ha. Because the LU file are in percentage, and the
# landarea is in km2, the product of (crop1_cell+crop2_cell) * landarea_cell is then in ha.
for icell in range(crop1.length):
crop1_cell = crop1.get_data(icell, 0.0)
crop2_cell = crop2.get_data(icell, 0.0)
gras1_cell = gras1.get_data(icell, 0.0)
gras2_cell = gras2.get_data(icell, 0.0)
landarea_cell = landarea.get_data(icell, 0.0)
# Put result in crop1 and gras1
crop_area = landarea_cell * (crop1_cell + crop2_cell)
gras_area = landarea_cell * (gras1_cell + gras2_cell)
if ((crop_area + gras_area) - (100.0 * landarea_cell) > 1.):
print("Crop and grass area is too large: ", crop_area + gras_area,
100. * landarea_cell,
(crop_area + gras_area) - (100.0 * landarea_cell))
try:
fac = (100 * landarea_cell) / (crop_area + gras_area)
except ZeroDivisionError:
fac = 0.0
crop_area *= fac
gras_area *= fac
nat_area = max(0.0, (100.0 * landarea_cell) - crop_area - gras_area)
# Put result in the maps in km2 (factor 0.01)
area_crop.set_data(icell, 0.01 * crop_area)
area_grass.set_data(icell, 0.01 * gras_area)
area_natural.set_data(icell, 0.01 * nat_area)
# Aggregate landarea on river basin scale
aggregate.aggregate_grid(basin, area_crop, mouth_dict, item="croparea")
aggregate.aggregate_grid(basin, area_grass, mouth_dict, item="grasarea")
aggregate.aggregate_grid(basin, area_natural, mouth_dict, item="natarea")
# Calculate the number of cells in a region/basin
one = ascraster.duplicategrid(landarea)
# Set all cells to one.
one.add_values(one.length * [1.0])
aggregate.aggregate_grid(basin, one, mouth_dict, item="number_of_cells")
# Delete the grid objects which are used anymore
del crop1
del crop2
del gras1
del gras2
del landarea
del one
return area_grass, area_crop, area_natural
def calculate(params,mask,mouth_dict,lake_icell_dict,basin,discharge,lddmap):
'''
This function calculates the residence time in the grid cells.
'''
# Read water storage of rivers and lakes/reservoirs.
water_storage = ascraster.Asciigrid(ascii_file=params.water_storage,\
mask=mask,numtype=float)
# Read rivers and lakes/reservoirs areas as fraction of the cellarea.
fraction_waterbody_grid = ascraster.Asciigrid(ascii_file=params.fraction_water,\
mask=mask,numtype=float)
# Read water depth of flooding areas.
flooding_depth = ascraster.Asciigrid(ascii_file=params.flooding_depth,\
mask=mask,numtype=float)
# Read flooding areas as fraction of the cellarea.
flooding_fraction = ascraster.Asciigrid(ascii_file=params.flooding_fraction,\
mask=mask,numtype=float)
# Read the cellarea
cellarea_grid = ascraster.Asciigrid(ascii_file=params.cellarea,\
mask=mask,numtype=float)
# Read lake/reservoir id
lakeid_grid = ascraster.Asciigrid(ascii_file=params.lakeid,\
mask=mask,numtype=int)
# Read outlet cell of lake/reservoir id. Only outlet cell is filled.
outlakeid_grid = ascraster.Asciigrid(ascii_file=params.outlakeid,\
mask=mask,numtype=int)
# Read area of lakes/reservoirs.
waterbody_area_grid = ascraster.Asciigrid(ascii_file=params.water_area,\
mask=mask,numtype=int)
# Water volume flooding area in m3
volume_flooding_grid = ascraster.duplicategrid(flooding_depth)
volume_flooding_grid.multiply(flooding_fraction,default_nodata_value = -1.0)
volume_flooding_grid.multiply(cellarea_grid,default_nodata_value = -1.0)
# Water volume of waterbody (river,lakes or reservoir) in m3 as left over of water_storage minus flooding volume.
volume_waterbody_grid = ascraster.duplicategrid(water_storage)
volume_waterbody_grid.substract(volume_flooding_grid,default_nodata_value = -1.0)
# Area water of river in m2.
area_waterbody_grid = ascraster.duplicategrid(cellarea_grid)
area_waterbody_grid.multiply(fraction_waterbody_grid,default_nodata_value = -1.0)
# Correct river volume and area when there is a reservoir or a lake.
for icell in range(lakeid_grid.length):
id = lakeid_grid.get_data(icell,-1)
if (id > 0):
# It is a lake or reservoir
# Check whether it is a outlet of a lake or reservoir
id_lake = outlakeid_grid.get_data(icell,-1)
if (id_lake > 0):
# It is an outlet. So put lake properties into the gridcell
volume_waterbody_grid.set_data(icell,water_storage.get_data(icell,0.0))
area_waterbody_grid.set_data(icell,waterbody_area_grid.get_data(icell,0.0))
else:
# It is not an outlet. So remove the calculated river properties.
volume_waterbody_grid.set_data(icell,0.0)
area_waterbody_grid.set_data(icell,0.0)
#volume_waterbody_grid.write_ascii_file(os.path.join(params.outputdir,"volume_waterbody_grid_negative.asc"))
# Correct all the volumes which are negative.
for icell in range(volume_waterbody_grid.length):
if (volume_waterbody_grid.get_data(icell,1.0) < 0.0):
#print "Negative waterbody volume: ", volume_waterbody_grid.get_data(icell),\
# flooding_depth.get_data(icell),flooding_fraction.get_data(icell),\
# cellarea_grid.get_data(icell),water_storage.get_data(icell),fraction_waterbody_grid.get_data(icell)
# When this happenes, we assume that the flooding is not correct. So the waterbody volume is equal to the water storage.
# Water volume flooding is zero.
volume_waterbody_grid.set_data(icell,water_storage.get_data(icell,0.0))
volume_flooding_grid.set_data(icell,0.0)
# Write volume in m3 and area in m2 to outputfile
volume_waterbody_grid.write_ascii_file(os.path.join(params.outputdir,"volume_waterbody_grid.asc"))
volume_flooding_grid.write_ascii_file(os.path.join(params.outputdir,"volume_flooding_grid.asc"))
area_waterbody_grid.write_ascii_file(os.path.join(params.outputdir,"area_waterbody_grid.asc"))
# Depth water of river in metres
depth_waterbody_grid = ascraster.duplicategrid(volume_waterbody_grid)
depth_waterbody_grid.divide(area_waterbody_grid,default_nodata_value = -1.0)
depth_waterbody_grid.write_ascii_file(os.path.join(params.outputdir,"depth_waterbody_grid.asc"))
# Calculate the water volume in m3 in the grid cell
volume_grid = ascraster.duplicategrid(volume_flooding_grid)
volume_grid.add(volume_waterbody_grid,default_nodata_value = -1.0)
volume_grid.write_ascii_file(os.path.join(params.outputdir,"volume_grid.asc"))
# Change water_storage from m3 into km3
volume_waterbody_grid.multiply(1.0e-9)
volume_flooding_grid.multiply(1.0e-9)
volume_grid.multiply(1.0e-9)
# Residence time is the volume divided by discharge.
# Calculate the residence time as volume water body divided by corrected discharge
# Corrected discharge is the discharge minus the water volume of the flooded area.
# If residence times are very high (e.g in dry areas),
# set the residence time to a maximum
# Apply maximum on gridcells which are not the outlet of a reservoir or lake.
residence_time_grid = ascraster.duplicategrid(volume_flooding_grid)
for icell in range(residence_time_grid.length):
# Check whether it is a lake/reservoir
id = lakeid_grid.get_data(icell,-1)
if (id > 0):
# It is a lake or reservoir
# Check whether it is a outlet of a lake or reservoir
id_lake = outlakeid_grid.get_data(icell,-1)
if (id_lake > 0):
try:
resi = lake_icell_dict[icell].residence_time
# It is an outlet. So put lake properties into the gridcell
if (lake_icell_dict[icell].residence_time > params.max_residence_time_per_lake):
# Change also the dictionary value of this waterbody
lake_icell_dict[icell].residence_time = params.max_residence_time_per_lake
resi = params.max_residence_time_per_lake
except KeyError:
print(id , " has no residence time")
resi = 0.0
else:
# Lake or reservoir but no outflow cell
resi = 0.0
residence_time_grid.set_data(icell,resi)
else:
# This is no reservoir or lake
dis = discharge.get_data(icell,0.0)
volume_flooded = volume_flooding_grid.get_data(icell,0.0)
volume_waterbody = volume_waterbody_grid.get_data(icell,0.0)
discharge_corrected = dis - volume_flooded
if (dis <= 0.0):
resi = 0.0
elif (discharge_corrected > volume_waterbody or volume_flooded <= 0.0):
# Here we assume that there is enough water to feed the channel.
resi = volume_waterbody/discharge_corrected
else:
# There is not enough water to feed the channel.
# Now we take an volume weighed average of both residence times.
volume_total = volume_waterbody + volume_flooded
if (volume_total > 0.0):
try:
frac_flooded = volume_flooded/volume_total
resi_flooded = frac_flooded * volume_flooded/dis
except ZeroDivisionError:
frac_flooded = 0.0
resi_flooded = 0.0
try:
frac_waterbody = volume_waterbody/volume_total
resi_waterbody = frac_waterbody * volume_waterbody/dis
except ZeroDivisionError:
frac_waterbody = 0.0
resi_waterbody = 0.0
resi = resi_flooded + resi_waterbody
else:
resi = 0.0
resi = min(resi,params.max_residence_time_per_cell)
residence_time_grid.set_data(icell,resi)
# Write residence_time to output file:
residence_time_grid.write_ascii_file(os.path.join(params.outputdir,"residence_time.asc"))
# Calculate the travel time of each grid cell to the river mouth
traveltime = accuflux.accutime(lddmap,residence_time_grid,lake_icell_dict)
traveltime.write_ascii_file(os.path.join(params.outputdir,"traveltime.asc"))
# Aggregate traveltime over the river basin.
aggregate.aggregate_grid(basin,traveltime,mouth_dict,item="sum_traveltime")
# Calculate the average traveltime for each river basin
for key in list(mouth_dict.keys()):
try:
mouth_dict[key].avg_traveltime = mouth_dict[key].sum_traveltime/mouth_dict[key].number_of_cells
except ZeroDivisionError:
mouth_dict[key].avg_traveltime = 0.0
except AttributeError:
pass
return residence_time_grid,traveltime