Code underlying the publication: Simulating event based pesticide transport with runoff and erosion, OpenLISEM-pesticide v.1

This repository contains the code and secondary data used to initialize and calibrate OpenLISEM-pesticide v1. The related article presents a novel pesticide transport model extension for the OpenLISEM runoff and erosion model. The model was designed to simulate dissolved and particulate phase transport of pesticides during rainfall-runoff events from agricultural fields. We conceptualized pesticide transport during runoff with a mixing-layer, including soil-water partitioning of the pesticides in the soil, mass transfer from the mixing layer to the runoff water and runoff or infiltration transport. Entrainment and deposition of soil particles drive the transport of sorbed pesticides. The model was tested on two rainfall-runoff events with observed data in a small agricultural catchment in South-Limburg, the Netherlands. The model could, after calibration, simulate the transported loads and concentrations of metobromuron and glyphosate adequately. A sensitivity analysis showed that pesticide transport was mainly influenced by the initial field concentrations and the soil-water partitioning. To obtain accurate simulations of pesticide contents, correct simulation of runoff and erosion is a prerequisite.