SeaweedScaleUpModel

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SeaweedScaleUpModel(
   path, cluster, seaweed_need, harvest_loss
)

Class that loads the data, calculates the scaleup and saves it into a csv

Methods:

.load_growth_timeseries

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.load_growth_timeseries(
   path, cluster
)

Loads the growth timeseries from the file

Arguments

  • path : the path to the timeseries
  • cluster : the cluster to use

Returns

None

.seaweed_growth

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.seaweed_growth(
   initial_seaweed, initial_area_built, initial_area_used,
   new_module_area_per_day, min_density, max_density, max_area,
   optimal_growth_rate, growth_rate_fraction, initial_lag,
   percent_usable_for_growth, days_to_run, verbose = False, calibration_run = False
)

Calculates the seaweed growth and creatss a dataframe of all important growth numbers

Arguments

  • initial_seaweed : The initial amount of seaweed in t
  • initial_area_built : The initial area built in km²
  • initial_area_used : The initial area used in km²
  • new_module_area_per_day : The area built per day in km²
  • min_density : The minimum density in t/km²
  • max_density : The maximum density in t/km²
  • max_area : The maximum area in km²
  • optimal_growth_rate : The optimal growth rate in %
  • growth_rate_fraction : The fraction of the growth rate (can either be scalar or list)
  • initial_lag : The initial lag in days
  • percent_usable_for_growth : The percent usable for growth in %
  • days_to_run : The number of days to run

Returns

A dataframe with all important growth numbers

.determine_average_productivity

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.determine_average_productivity(
   growth_rate_fraction, days_to_run, percent_usable_for_growth,
   optimal_growth_rate
)

Let the model run for one km² to determine the productivity per area and day and the harvest intervall

Arguments

  • growth_rate_fraction : float or list of the growth rate of seaweed
  • days_to_run : int, number of days to run the model
  • percent_usable_for_growth : float, the percentage of the module area that can be used for growth
  • optimal_growth_rate : float, the optimal growth rate of the seaweed

Returns

  • productivity : float, the average productivity per km² and day

self_shading

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.self_shading(
   density
)

Calculates how much the growth rate is reduced due to self shading. Based on the publication: Lapointe, B. E., & Ryther, J. H. (1978). Some aspects of the growth and yield of Gracilaria tikvahiae in culture. Aquaculture, 15(3), 185-193. https://doi.org/10.1016/0044-8486(78)90030-3

Arguments

  • density : the seaweed density

Returns

the growth rate fraction

calculate_seaweed_need

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.calculate_seaweed_need(
   global_pop, calories_per_person_per_day, food_waste,
   calories_per_t_seaweed_wet, seaweed_limit
)

Calculates the amount of seaweed needed to feed the population based on global population and the amount of seaweed needed per person limited by the iodine content of the seaweed

Arguments

  • global_pop (int) : Global population
  • calories_per_person_per_day (int) : Calories needed per person per day
  • food_waste (float) : Fraction of food wasted
  • calories_per_kg_seaweed (int) : Calories per t of seaweed
  • seaweed_limit (float) : how large a fraction of the food can be substituted by seaweed

Returns

  • float : amount of seaweed needed to feed the population

seaweed_farm_area_per_day

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.seaweed_farm_area_per_day(
   day
)

Estimates the area that can be built per day based on how many days have passed. This is a rough estimate based on: https://github.com/allfed/Seaweed-Scaleup-Model/blob/main/scripts/Logistic%20Growth.ipynb

Arguments

  • day : the day

Returns

the area that can be built per day

logistic_curve

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.logistic_curve(
   x, max_L, k, x0, off
)

Describes a logistic growth curve

Arguments

  • x : value to calculate
  • max_L : maximum value of the curve
  • k : the logistic growth rate
  • x0 : the sigmoid's midpoint
  • off : offset to 0

Returns float: y value corresponding to x

run_model

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.run_model(
   optimal_growth_rate, days_to_run, global_pop, calories_per_person_per_day,
   harvest_loss, food_waste, calories_per_t_seaweed_wet, food_limit, feed_limit,
   biofuel_limit, percent_usable_for_growth, scenarios, location,
   number_of_clusters
)

Run the model

Arguments

  • optimal_growth_rate (float) : the optimal growth rate
  • days_to_run (int) : the number of days to run the model
  • global_pop (int) : Global population
  • calories_per_person_per_day (int) : Calories needed per person per day
  • harvest_loss (float) : Fraction of harvest lost
  • food_waste (float) : Fraction of food wasted
  • calories_per_kg_seaweed (int) : Calories per t of seaweed
  • food_limit (float) : how large a fraction of the food can be substituted by seaweed
  • feed_limit (float) : how large a fraction of the feed can be substituted by seaweed
  • biofuel_limit (float) : how large a fraction of the biofuel can be substituted by seaweed
  • percent_usable_for_growth (float) : how much of the harvest is usable for growth
  • scenarios (list) : list of scenarios to run
  • location (str) : location on the globe
  • number_of_clusters (int) : number of clusters

Returns

None