MimiCIAM.jl

This is a work-in-progress respository for a Julia-Mimi implementation the CIAM model adapted from Diaz, 2016.

Preparing the Software Environment

Your first step is to install MimiCIAM.jl itself, which you can do as follows in Julia:

import Pkg; Pkg.add("MimiCIAM")

You probably also want to install the Mimi package into your julia environment, so that you can use some of the tools in there:

Pkg.add("Mimi")

Running the Model

The model uses the Mimi framework and it is highly recommended to read the Mimi documentation first to understand the code structure. The basic way to access a copy of the default MimiFAIRv2 model and explore the resuts is the following:

The basic way to access a copy of the default MimiCIAM model is the following:

using MimiCIAM
m = MimiCIAM.get_model()
run(m)

Keyword Arguments

The get_model() function has the following signature:

get_model(;
    initfile = nothing,
    fixed::Bool = true,
    t::Int = 20,
    noRetreat::Bool = false,
    allowMaintain::Bool = false,
    popinput::Int = 0)

which includes several optional keyword arguments to customize the CIAM model you wish to run:

• initfile (default = "data/batch/init.csv") : takes a path to a initilization file used to set several parameters (described below) and defaulting to
• t (default = 20): the number of timesteps to run

we do not recommend altering the following without consultation with the authors as changes from the default are experimental

• popinput (default = 0): a socioeconomic parameter that specifies the population data source such with the following options, noting that as of now 1 and 2 are temporarily disabled so 0 is the only option: 0 (default), 1 (Jones & O'Neill, 2016), or 2 (Merkens et al, 2016)
• noRetreat (default = false): a model parameter that specifies if retreat is allowed, such that if the parameter is true, segments will either protect or not adapt, but never retreat.
• fixed (default = true): a model parameter that specifies if you want to run the model as fixed (true) or flexible (false) with respect to adaptation
• allowMaintain (default = false): a model parameter that specifies if maintaining defenses is an option, such that if the parameter is true segments will have the option to maintain current defenses

Initialization File

The initfile parameter above takes a path to a file that must be specially formatted as the init.txt file at "data/batch/init.csv":

run_name,lslr,subset,ssp,ssp_simplified
base,lsl_rcp85_p50.csv,false,IIASAGDP_SSP5_v9_130219,5

This file will indicate the data to import for a given run, the bulk of this work being done in MimiCIAM.import_model_data. The file contains several parameters:

• run_name (default = base): the name of the run, can be used in labeling and results file production
• lslr (default = "lsl_rcp85_p50.csv"): the filename of the file used for lslr settings, which must be available in "data/lslr"
• subset (default = false): the list of of segment IDs to run the model for, where false indicates running all segments
• ssp (default = "IIASAGDP_SSP5_v9_130219"): the full SSP name that will provide several socioconomic parameters, see the names after "pop" and "ypcc" in "data/ssp" for options
• ssp_simplified (default = 5): the integer representing the SSP (1-5)

In order to make creation of such a file easier, we provide an (unexported) file creation function MimiCIAM.write_init_file(run_name::String, outputdir::String, init_settings::Dict) which writes the initialization file for a specificied run_name into outputdir using init_settings found in init_settings.

Note that init_settings is a Dictionary with one entry per parameter, best shown through the following example:

run_name = "ctrl+SSP5"

init_settings = Dict(
        :init_filename   => string("$run_name", "_init.csv"),
        :lslrfile        => "lsl_rcp85_p50.csv",
        :subset          => false,
        :ssp             => "IIASAGDP_SSP5_v9_130219",
        :ssp_simplified  => 5
    )

MimiCIAM.write_init_file(run_name, outputdir, init_settings)

Exploring Model Results

There are several options for exploring the results of a run model, many of which are described in the Mimi.jl documentation here. In addition, we offer some custom (unexported) functions including the following for a model m.

MimiCIAM.write_ciam(m; runname::String = "base", sumsegs::String = "seg", varnames::Bool = false, tag::Bool = false)

Write out model results to CSV file using arguments:

• m: output from get_model function
• runname (defaults to "base")
• sumsegs (defaults to "seg"): whether to sum across all segments ("global"), to region level ("rgn"), or no sums ("seg")
• varnames (defaults to false): if not false, write the passed variable names; if false get defaults from file
• tag (defaults to false): if not false, a string to add to the end of the filename, which is written out as "runname_sumsegs_rcp_tag.csv"

MimiCIAM.write_optimal_costs(m; outputdir::String = joinpath(@__DIR__,"..","output"), runname="base")

Write out optimal adaptation costs for model m with runname runname into outputdirectory outputdir.