sim_daily_from_annual: Daily Weather Generator Conditioned on Simulated Annual...

In HydrosystemsGroup/Weather-Generator: Daily weather generator for performing a climate stress test.

Description

Given a timeseries of simulated annual precipitation, simulate daily weather using the KNN and Markov Chain method.

Usage

sim_daily_from_annual(prcp_yr, obs_day, obs_prcp_yr, start_month = 10,
  include_leap_days = FALSE, n_knn_annual = 100, dry_wet_threshold = 0.3,
  wet_extreme_quantile_threshold = 0.8, adjust_annual_precip = TRUE,
  annual_precip_adjust_limits = c(0.9, 1.1), dry_spell_changes = 1,
  wet_spell_changes = 1, prcp_mean_changes = 1, prcp_cv_changes = 1,
  temp_mean_changes = 0)

Arguments

prcp_yr	simulated annual precipitation as zoo object
obs_day	observed daily weather as multi-column zoo object
obs_prcp_yr	observed annual precipitation as numeric vector
start_month	first month of the water year
include_leap_days	boolean flag to include leap days (default=FALSE)
n_knn_annual	number of years used for annual KNN sampling
dry_wet_threshold	threshold precipitation amount for dry/wet states
wet_extreme_quantile_threshold	threshold quantile for wet/extreme states
adjust_annual_precip	flag to adjust simulated daily precip to match simulated annual precip
annual_precip_adjust_limits	range of maximum annual precip adjustment factors
dry_spell_changes	adjustment factor(s) for dry spell durations (single value, or vector of length 12 for monthly)
wet_spell_changes	adjustment factor(s) for wet spell durations (single value, or vector of length 12 for monthly)
prcp_mean_changes	adjustment factor(s) for mean precip (single value, or vector of length 12 for monthly)
prcp_cv_changes	adjustment factor(s) for precip CV (single value, or vector of length 12 for monthly)
temp_mean_changes	adjustment factor(s) for mean temp (single value, or vector of length 12 for monthly)

Value

a named list containing:

obs	the historical observation dataset used to train the simulation
state_thresholds	monthly precipitation thresholds for defining Markov states based on the historical dataset
transition_matrices	monthly transition matrices based on the historical dataset
state_equilibria	monthly state equilibria probabilities
out	a data frame of the simulated daily weather

HydrosystemsGroup/Weather-Generator documentation built on May 8, 2019, 8:34 a.m.