From 04a25e4dacfb615b3931984cfbca8ede3bb45024 Mon Sep 17 00:00:00 2001 From: Ranke Johannes Date: Thu, 7 Mar 2024 10:37:07 +0100 Subject: Generalise PEC_sw_drift MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit - Possibility to use FOCUS drift values (mean over width of waterbody) - Support side angles other than 90°, i.e. 45° (0° to 90°) --- docs/reference/PEC_sw_drift.html | 43 ++++++++++++++++++++++++++++++++++++--- docs/reference/Rplot001.png | Bin 14540 -> 1011 bytes 2 files changed, 40 insertions(+), 3 deletions(-) (limited to 'docs/reference') diff --git a/docs/reference/PEC_sw_drift.html b/docs/reference/PEC_sw_drift.html index b7abba7..1fe8465 100644 --- a/docs/reference/PEC_sw_drift.html +++ b/docs/reference/PEC_sw_drift.html @@ -65,6 +65,9 @@ with input via spray drift.

crop_group_focus = c("arable", "hops", "vines, late", "vines, early", "fruit, late", "fruit, early", "aerial"), distances = c(1, 5, 10, 20), + formula = c("Rautmann", "FOCUS"), + water_width = 100, + side_angle = 90, rate_units = "g/ha", PEC_units = "µg/L" ) @@ -86,13 +89,14 @@ with input via spray drift.

drift_percentages

Percentage drift values for which to calculate PECsw. -'drift_data' and 'distances' if not NULL.

+Overrides 'drift_data' and 'distances' if not NULL.

drift_data

Source of drift percentage data. If 'JKI', the drift_data_JKI -included in the package is used. If 'RF', the Rautmann formula is used, if -implemented for the crop type and number of applications

+included in the package is used. If 'RF', the Rautmann drift data are calculated +either in the original form or integrated over the width of the water body, depending +on the 'formula' argument.

crop_group_JKI
@@ -108,6 +112,21 @@ as used in drift_parameters_focus.

The distances in m for which to get PEC values

+
formula
+

By default, the original Rautmann formula is used. If you +specify "FOCUS", mean drift input over the width of the water body is +calculated as described in Chapter 5.4.5 of the FOCUS surface water guidance

+ + +
water_width
+

Width of the water body in cm

+ + +
side_angle
+

The angle of the side of the water relative to the bottom which +is assumed to be horizontal, in degrees. The SYNOPS model assumes 45 degrees here.

+ +
rate_units

Defaults to g/ha

@@ -163,6 +182,24 @@ as used in drift_parameters_focus.

#> 0.92333333 0.31666667 0.19000000 0.16000000 0.09666667 0.05000000 0.02000000 #> 0.03 % #> 0.01000000 + +# The influence of assuming a 45° angle of the sides of the waterbody and the width of the +# waterbody can be illustrated +PEC_sw_drift(100) +#> 1 m 5 m 10 m 20 m +#> 0.92333333 0.19000000 0.09666667 0.05000000 +PEC_sw_drift(100, drift_data = "RF") +#> 1 m 5 m 10 m 20 m +#> 0.91976667 0.19064473 0.09680051 0.04915079 +PEC_sw_drift(100, drift_data = "RF", formula = "FOCUS") +#> 1 m 5 m 10 m 20 m +#> 0.64246407 0.17414541 0.09235842 0.04798749 +PEC_sw_drift(100, drift_data = "RF", formula = "FOCUS", side_angle = 45) +#> 1 m 5 m 10 m 20 m +#> 0.91780582 0.24877916 0.13194060 0.06855356 +PEC_sw_drift(100, drift_data = "RF", formula = "FOCUS", side_angle = 45, water_width = 200) +#> 1 m 5 m 10 m 20 m +#> 0.30085000 0.09468652 0.05201349 0.02758547