Title of the talk: Transport and fate of herbicides in cropped lysimeters considering different model setups in the vadose zone
Understanding transport and fate processes in the subsurface are of fundamental importance to identify leaching potentials of, e.g., herbicides to groundwater resources. Combining observations and mathematical modelling is often the only way to improve process understanding and obtaining information on involved processes and their rates. In our study case, four herbicides were applied over a period of 4.5 years on two lysimeters located in Wielenbach, Germany, and monitored in lysimeter drainage. First, we characterized flow within the lysimeters by using stable water isotopes and two unsaturated flow models. Building up on these findings, one model was extended for describing reactive transport of the herbicides and investigating the contribution of different processes on chemical fate. Results show higher influence of immobile water and preferential flow on herbicide leaching.
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