diff options
Diffstat (limited to 'R')
| -rw-r--r-- | R/PEC_sw_exposit_runoff.R | 105 |
1 files changed, 90 insertions, 15 deletions
diff --git a/R/PEC_sw_exposit_runoff.R b/R/PEC_sw_exposit_runoff.R index 733f621..a9cbf07 100644 --- a/R/PEC_sw_exposit_runoff.R +++ b/R/PEC_sw_exposit_runoff.R @@ -12,8 +12,8 @@ #' \item{bound}{The percentage of the applied substance transferred to an #' adjacent water body bound to eroding particles} #' } -#' @source Excel 3.01 spreadsheet available from -#' \url{https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3} +#' @source Excel 3.02 spreadsheet available from +#' \url{https://www.bvl.bund.de/EN/04_PlantProtectionProducts/03_Applicants/04_AuthorisationProcedure/08_Environment/ppp_environment_node.html} #' @export perc_runoff_exposit #' @examples #' print(perc_runoff_exposit) @@ -39,13 +39,13 @@ rownames(perc_runoff_exposit) <- Koc_classes #' \item{dissolved}{The reduction percentage for the dissolved phase} #' \item{bound}{The reduction percentage for the particulate phase} #' } -#' @source Excel 3.01 spreadsheet available from -#' \url{https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3} +#' @source Excel 3.02 spreadsheet available from +#' \url{https://www.bvl.bund.de/EN/04_PlantProtectionProducts/03_Applicants/04_AuthorisationProcedure/08_Environment/ppp_environment_node.html} #' @export #' @examples #' print(perc_runoff_reduction_exposit) perc_runoff_reduction_exposit <- list( - "3.01" = data.frame( + "3.02" = data.frame( dissolved = c(0, 40, 60, 80), bound = c(0, 40, 85, 95), row.names = c("No buffer", paste(c(5, 10, 20), "m"))), @@ -57,16 +57,18 @@ perc_runoff_reduction_exposit <- list( #' Calculate PEC surface water due to runoff and erosion as in Exposit 3 #' -#' This is a reimplementation of the calculation described in the Exposit 3.01 spreadsheet file, -#' in the worksheet "Konzept Runoff". Calculation of sediment PEC values is not implemented. +#' This is a reimplementation of the calculation described in the Exposit 3.02 spreadsheet file, +#' in the worksheet "Konzept Runoff". #' #' @param rate The application rate in g/ha +#' @param interception The fraction intercepted by the crop #' @param Koc The sorption coefficient to soil organic carbon #' @param DT50 The soil half-life in days #' @param t_runoff The time between application and the runoff event, where degradation occurs, in days #' @param exposit_reduction_version The version of the reduction factors to be used #' @param V_ditch The volume of the ditch is assumed to be 1 m * 100 m * 30 cm = 30 m3 #' @param V_event The unreduced runoff volume, equivalent to 10 mm precipitation on 1 ha +#' @param dilution The dilution factor #' @return A list containing the following components #' \describe{ #' \item{perc_runoff}{The runoff percentages for dissolved and bound substance} @@ -75,17 +77,17 @@ perc_runoff_reduction_exposit <- list( #' for the different distances. If the rate was given in g/ha, the PECsw are in microg/L.} #' } #' @export -#' @source Excel 3.01 spreadsheet available from +#' @source Excel 3.02 spreadsheet available from #' \url{https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3} #' @seealso \code{\link{perc_runoff_exposit}} for runoff loss percentages and \code{\link{perc_runoff_reduction_exposit}} for runoff reduction percentages used #' @examples -#' PEC_sw_exposit_runoff(500, 150) -PEC_sw_exposit_runoff <- function(rate, Koc, DT50 = Inf, t_runoff = 3, - exposit_reduction_version = c("3.01", "2.0"), - V_ditch = 30, V_event = 100) +#' PEC_sw_exposit_runoff(500, Koc = 150) +PEC_sw_exposit_runoff <- function(rate, interception = 0, Koc, DT50 = Inf, t_runoff = 3, + exposit_reduction_version = c("3.02", "2.0"), + V_ditch = 30, V_event = 100, dilution = 2) { k_deg <- log(2)/DT50 - input <- rate * 1 * exp(-k_deg * t_runoff) # assumes 1 ha treated area + input <- rate * (1 - interception) * 1 * exp(-k_deg * t_runoff) # assumes 1 ha treated area if (length(Koc) > 1) stop("Only one compound at a time supported") @@ -96,8 +98,8 @@ PEC_sw_exposit_runoff <- function(rate, Koc, DT50 = Inf, t_runoff = 3, transfer_runoff <- 1 - reduction_runoff V_runoff <- V_event * (1 - reduction_runoff[["dissolved"]]) # m3 - V_ditch_runoff <- V_ditch + V_runoff - V_flowing_ditch_runoff <- 2 * V_ditch_runoff + V_flowing_ditch_runoff <- dilution * (V_ditch + V_runoff) + f_runoff_exposit <- function(Koc) { Koc_breaks <- c(perc_runoff_exposit$Koc_lower_bound, Inf) Koc_classes <- as.character(cut(Koc, Koc_breaks, labels = rownames(perc_runoff_exposit))) @@ -118,3 +120,76 @@ PEC_sw_exposit_runoff <- function(rate, Koc, DT50 = Inf, t_runoff = 3, PEC_sw_runoff = PEC_sw_runoff) return(result) } + +#' Calculate PEC surface water due to drainage as in Exposit 3 +#' +#' This is a reimplementation of the calculation described in the Exposit 3.02 spreadsheet file, +#' in the worksheet "Konzept Drainage". Although there are four groups of +#' compounds ("Gefährdungsgruppen"), only one distinction is made in the +#' calculations, between compounds with low mobility (group 1) and compounds +#' with modest to high mobility (groups 2, 3 and 4). In this implementation, +#' the group is derived only from the Koc, if not given explicitly. For +#' details, see the discussion of the function arguments below. +#' +#' @param rate The application rate in g/ha +#' @param interception The fraction intercepted by the crop +#' @param Koc The sorption coefficient to soil organic carbon used to determine the mobility. A trigger +#' value of 550 L/kg is used in order to decide if Koc >> 500. +#' @param mobility Overrides what is determined from the Koc. +#' @param DT50 The soil half-life in days +#' @param t_drainage The time between application and the drainage event, where degradation occurs, in days +#' @param V_ditch The volume of the ditch is assumed to be 1 m * 100 m * 30 cm = 30 m3 +#' @param V_drainage The drainage volume, equivalent to 1 mm precipitation on 1 ha for spring/summer or 10 mm for +#' autumn/winter/early spring. +#' @param dilution The dilution factor +#' @return A list containing the following components +#' \describe{ +#' \item{perc_runoff}{The runoff percentages for dissolved and bound substance} +#' \item{runoff}{A matrix containing dissolved and bound input for the different distances} +#' \item{PEC_sw_runoff}{A matrix containing PEC values for dissolved and bound substance +#' for the different distances. If the rate was given in g/ha, the PECsw are in microg/L.} +#' } +#' @export +#' @source Excel 3.02 spreadsheet available from +#' \url{https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3} +#' @seealso \code{\link{perc_runoff_exposit}} for runoff loss percentages and \code{\link{perc_runoff_reduction_exposit}} for runoff reduction percentages used +#' @examples +#' PEC_sw_exposit_drainage(500, Koc = 150) +PEC_sw_exposit_drainage <- function(rate, interception = 0, Koc = NA, mobility = c(NA, "low", "high"), DT50 = Inf, t_drainage = 3, + V_ditch = 30, V_drainage = c(spring = 10, autumn = 100), dilution = 2) +{ + # Rückstand zum Zeitpunkt des Niederschlagsereignisses (residue at the time of the drainage event) + k_deg <- log(2)/DT50 + residue <- rate * (1 - interception) * 1 * exp(-k_deg * t_drainage) # assumes 1 ha treated area + + mobility <- match.arg(mobility) + if (is.na(mobility)) { + if (is.na(Koc)) stop("Koc is needed if the mobility is not specified") + else { + if (Koc > 550) mobility = "low" + else mobility = "high" + } + } + + V_ditch_drainage <- V_ditch + V_drainage + V_flowing_ditch_drainage <- dilution * V_ditch_drainage + + # Gesamtaustrag (total fraction of the residue drained) + if (mobility == "low") { + f_drainage_total <- c(spring = 0.01 * 1e-2, + autumn = 0.05 * 1e-2) + } else { + f_drainage_total <- c(spring = 0.2 * 1e-2, + autumn = 1.0 * 1e-2) + } + + f_peak = c(spring = 0.125, autumn = 0.25) # Stoßbelastung (fraction drained at event) + + PEC_sw_drainage <- 1000 * residue * f_drainage_total * f_peak / V_flowing_ditch_drainage + + result <- list( + perc_drainage_total = 100 * f_drainage_total, + perc_peak = 100 * f_peak, + PEC_sw_drainage = PEC_sw_drainage) + return(result) +} |