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Information - SSS25 Multi-process transport of organic chemicals through soils (co-listed in BG & HS)
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Event Information |
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In regions with intense agriculture, losses of organic chemicals such as pesticides, hormones or antibiotics from field soils into surface water bodies and groundwater may put natural water resources at risk. For pesticides, the EU water framework directive requires a river basin management yielding good chemical status of groundwater and surface waters in Europe by the year 2015. To achieve this goal, a sustainable land use with improved soil and crop management may be required. Furthermore, in regions with vulnerable soil and site conditions with regard to solute losses, mitigation with reduced applications of pesticides and other chemicals may become necessary.
Basic research is indispensable to improve our understanding of organic chemical transport in soils. This understanding can be used as a basis to, e.g., enhance soil management, or to further enhance the security of the tiered pesticide registration procedure on EU and national levels.
Organic chemical transport through soils is complicated by multiple processes acting concurrently, such as dispersion and lateral mixing, biodegradation, preferential flow involving physical non-equilibrium, and rate-limited nonlinear sorption involving chemical non-equilibrium. Each of these processes may be rather complex in itself. Furthermore, transport processes may depend on soil properties such as texture and structure, organic matter, water saturation, temperature, pH and redox conditions, among others.
In this session, experimental and/or modeling studies analyzing multi-process organic agrochemical transport are particularly welcome. The following topics are of particular interest:
· Lab- or field-scale transport experiments reporting new findings on organic chemical transport under various conditions, e.g., dissolved or particle facilitated transport, physical and/or chemical non-equilibrium, steady-state and/or transient variably-saturated flow.
· Improving experimental designs for inverse parameter identification.
· Inverse model simulation of organic chemical transport and parameter identification
· New model developments for analyzing organic chemical transport
· The relative importance of soil properties versus organic chemical properties for transport in sandy soils versus fine-textured soils. Are sandy soils or fine textured soils with preferential flow paths the “worst case” for organic chemical losses?
· The relative importance of pathways, e.g., erosive overland flow versus leaching through the soil, for contamination of water resources.
· Management actions (e.g., grassed filter strips, soil management) to reduce organic chemical losses to groundwater and surface water.
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