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authorJohannes Ranke <jranke@uni-bremen.de>2016-09-27 23:00:48 +0200
committerJohannes Ranke <jranke@uni-bremen.de>2016-09-27 23:00:48 +0200
commit12a31f4c130c551f82232d9ef7dfb608bd52c53f (patch)
tree2525ab1ea4102a6edddbd0c2f03f4a851bf2f9c5 /pkg/R/PEC_sw_sed.R
parent0d958ab6f84b569b5437f231c56004890c4ae23b (diff)
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-# Copyright (C) 2015 Johannes Ranke
-# Contact: jranke@uni-bremen.de
-# This file is part of the R package pfm
-
-# This program is free software: you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free Software
-# Foundation, either version 3 of the License, or (at your option) any later
-# version.
-
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
-# details.
-
-# You should have received a copy of the GNU General Public License along with
-# this program. If not, see <http://www.gnu.org/licenses/>
-
-#' Calculate predicted environmental concentrations in sediment from surface
-#' water concentrations
-#'
-#' The method 'percentage' is equivalent to what is used in the CRD spreadsheet
-#' PEC calculator
-#'
-#' @param PEC_sw Numeric vector or matrix of surface water concentrations in µg/L for
-#' which the corresponding sediment concentration is to be estimated
-#' @param percentage The percentage in sediment, used for the percentage method
-#' @param method The method used for the calculation
-#' @param sediment_depth Depth of the sediment layer
-#' @param water_depth Depth of the water body in cm
-#' @param sediment_density The density of the sediment in L/kg (equivalent to
-#' g/cm3)
-#' @param PEC_sed_units The units of the estimated sediment PEC value
-#' @return The predicted concentration in sediment
-#' @export
-#' @author Johannes Ranke
-#' @examples
-#' PEC_sw_sed(PEC_sw_drift(100, distances = 1), percentage = 50)
-PEC_sw_sed <- function(PEC_sw, percentage = 100, method = "percentage",
- sediment_depth = 5, water_depth = 30,
- sediment_density = 1.3,
- PEC_sed_units = c("\u00B5g/kg", "mg/kg"))
-{
- method = match.arg(method)
- PEC_sed_units = match.arg(PEC_sed_units)
- if (method == "percentage") {
- PEC_sed = PEC_sw * (percentage/100) * (water_depth / sediment_depth) * (1 / sediment_density)
- if (PEC_sed_units == "mg/kg") PEC_sed <- PEC_sed / 1000
- }
- return(PEC_sed)
-}

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