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"""generate_recession_tables.py
Generate ZSA and ZRFC recession tables (storm demand vs. chainage) based on
Nielsen et al. (1992) for lidar-derived beach profiles.
Reads:
Profiles 1 to 12 2019 DEM.xlsx
Writes:
recession_results_zsa.csv
recession_results_zrfc.csv
D Howe
d.howe@wrl.unsw.edu.au
2022-05-06
"""
import os
import re
import json
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from nielsen import Gridder, BeachProfile
BEACH = 'Roches Beach'
COLUMNS = ['Chainage', 'Easting', 'Northing', 'Elevation'] # Workbook headers
VOLUME = 200 # Storm demand volume for plotting (m^3/m)
FIGURE_DIR = 'png' # Save profile plots here
# Define block and profile IDs
with open('settings.json', 'r') as f:
DATA = json.loads(f.read())
print('.', end='', flush=True) # Show progress
# Load data
xlsx_path = 'Profiles 1 to 12 2019 DEM.xlsx'
workbook = pd.ExcelFile(xlsx_path)
sheets = [s for s in workbook.sheet_names if s[0].isdigit()][::-1]
# Create output dataframs
zsa = pd.DataFrame(index=[[], [], []])
zrfc = pd.DataFrame(index=[[], [], []])
zsa.index = zsa.index.set_names(['beach', 'block', 'profile'])
zrfc.index = zrfc.index.set_names(['beach', 'block', 'profile'])
for s in sheets:
print('.', end='', flush=True) # Show progress
# Get block and profile IDs
block = DATA[s].pop('block')
profile = DATA[s].pop('profile')
# Get additional keyword arguments for Nielsen calculations
kwargs = DATA[s]
# Read current sheet in workbook
df = workbook.parse(s, names=COLUMNS)
# Extract profile coordinates
g = Gridder(chainage=df['Chainage'],
elevation=df['Elevation'],
easting=df['Easting'],
northing=df['Northing'],
**kwargs)
# Update recession tables
zsa.loc[(BEACH, block, profile), g.volume] = g.chainage['zsa']
zrfc.loc[(BEACH, block, profile), g.volume] = g.chainage['zrfc']
# Plot profiles
fig, ax = plt.subplots(1, 1, figsize=(12, 4))
p = BeachProfile(df['Chainage'], df['Elevation'])
p.plot(v=VOLUME, ax=ax, title=f'Roches Beach, P{s}')
ax.spines['top'].set_visible(False)
ax.spines['right'].set_visible(False)
png_path = os.path.join(FIGURE_DIR, f'P{s}')
plt.savefig(png_path, bbox_inches='tight', dpi=300)
# Write tables
zsa.to_csv('recession_results_zsa.csv', float_format='%0.3f')
zrfc.to_csv('recession_results_zrfc.csv', float_format='%0.3f')
print('\nFinished.')

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{
"1": {
"block": 1,
"profile": 1,
"z_swash": 2
},
"2": {
"block": 2,
"profile": 1,
"z_swash": 2
},
"3": {
"block": 3,
"profile": 1,
"z_swash": 2
},
"4s": {
"block": 4,
"profile": 1,
"z_swash": 2
},
"4": {
"block": 4,
"profile": 2,
"z_swash": 2
},
"4n": {
"block": 4,
"profile": 3,
"z_swash": 2
},
"5": {
"block": 5,
"profile": 1,
"z_swash": 2
},
"6": {
"block": 6,
"profile": 1,
"z_swash": 2
},
"7": {
"block": 7,
"profile": 1,
"z_swash": 2
},
"8": {
"block": 8,
"profile": 1,
"z_swash": 2
},
"9": {
"block": 9,
"profile": 1,
"z_swash": 2
},
"10": {
"block": 10,
"profile": 1,
"z_swash": 2
},
"11": {
"block": 11,
"profile": 1,
"z_swash": 2
},
"12": {
"block": 12,
"profile": 1,
"z_swash": 2
}
}
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