#' model bacteria generation from coyotes
#'
#' This function is the bacteria source-model Coyote. The model
#' generates input for HSPF. The specific outputs from this source model
#' are loads from the beaver to land and directly to the stream
#' The load to the land is in the form of load/acre for forest
#' PLS in a sub-watershed that the source-model contributes to and
#' the hourly load to the stream in the form of a MUTSIN file. The
#' input for the model is from an ASCII text file. Use the text below
#' as a template for the input file. The symbol used for comments in
#' the input file is "***". The definitions for the symbols used in
#' the template are: YYYY is four-digit year, MM two-digit month,
#' DD is the two-digit day, ## is an integer, #.# is a floating point
#' number, and #.#E+## is a number in scientific notation
#' @param chr.file.input is the input file for the model
#' @export
wildlife.Coyote <- function(chr.file.input) {
## read input files
df.input <- utils::read.delim(chr.file.input, sep=":",
comment.char="*", stringsAsFactors=FALSE,
header=FALSE)
names(df.input) <- c("parameter","value")
##
## set values for variables
## get sub watershed number
chr.sub <- gsub("([^0-9]){1, }", "" , df.input[df.input$parameter == "Watershed", "value"])
## land use information
lu.pasture.area <- as.numeric(df.input$value[
df.input$parameter == "Pasture Area in Watershed (ac)"])
lu.forest.area <- as.numeric(df.input$value[
df.input$parameter == "Forest Area in Watershed (ac)"])
lu.RAOCUT.area <- as.numeric(df.input$value[
df.input$parameter == "Residential/Agricultural Operration Area/Commercial/Urban/Transportation (ac)"])
## coyote habitat set to all PLS area
lu.habitatarea <- lu.pasture.area + lu.forest.area + lu.RAOCUT.area
## animal information
## population densities
amn.density <- as.numeric(df.input$value[
df.input$parameter == "Animal Density (animal/ac)"])
## percent of time defecating in or around streams
amn.percentstream <- as.numeric(df.input$value[
df.input$parameter == "Percent of animals in and around streams"]) / 100
## all landuse has stream access for Coyotes
## bacteria production per animal
amn.bac.prod <- as.numeric(df.input$value[
df.input$parameter == "Bacteria Production of animal per day (orgs/day)"])
amn.SQLIM.factor <- as.numeric(df.input$value[
df.input$parameter == "SQOLIM multiplcation factor"])
##
### Calculations
### Populations
pop.total <- lu.habitatarea * amn.density
pop.pasture <- lu.pasture.area * amn.density
pop.forest <- lu.forest.area * amn.density
pop.RAOCUT <- lu.RAOCUT.area * amn.density
pop.on.land <- (1-amn.percentstream) * pop.total
pop.on.land.pasture <- (1-amn.percentstream) * pop.pasture
pop.on.land.forest <- (1-amn.percentstream) * pop.forest
pop.on.land.RAOCUT <- (1-amn.percentstream) * pop.RAOCUT
pop.in.stream <- amn.percentstream * pop.total
### bacteria loads
bac.total <- pop.total * amn.bac.prod
bac.on.land <- amn.bac.prod * pop.on.land
bac.on.land.pasture <- amn.bac.prod * pop.on.land.pasture
bac.on.land.forest <- amn.bac.prod * pop.on.land.forest
bac.on.land.RAOCUT <- amn.bac.prod * pop.on.land.RAOCUT
bac.in.stream <- amn.bac.prod * pop.in.stream
### accum values
accum.pasture <- 0
accum.forest <- 0
accum.RAOCUT <- 0
if(lu.pasture.area > 0) {
accum.pasture <- bac.on.land.pasture / lu.pasture.area
}
if(lu.forest.area > 0) {
accum.forest <- bac.on.land.forest / lu.forest.area
}
if(lu.RAOCUT.area > 0) {
accum.RAOCUT <- bac.on.land.RAOCUT / lu.RAOCUT.area
}
##
## Assemble output data frame
df.output <- data.frame(
sub = chr.sub,
Month=format(as.POSIXct(paste0("1967-",1:12,"-01")), format = "%b"),
pop.total=pop.total,
pop.on.land=pop.on.land,
pop.in.stream=pop.in.stream,
Bacteria.total=bac.total,
Bacteria.on.land=bac.on.land,
Bacteria.direct.to.stream=bac.in.stream,
Accum.pasture=accum.pasture,
Accum.forest=accum.forest,
Accum.RAOCUT=accum.RAOCUT,
Lim.pasture=amn.SQLIM.factor * accum.pasture,
Lim.forest=amn.SQLIM.factor * accum.forest,
Lim.RAOCUT=amn.SQLIM.factor * accum.RAOCUT,
stringsAsFactors=FALSE)
##
### return results
return(df.output)
}
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