A review of model applications for structured soils: b) Pesticide transport

Köhne, J. Maximilian; Köhne, Sigrid; Šimůnek, Jirka

doi:10.1016/j.jconhyd.2008.10.003

Cited by 179 publications

(122 citation statements)

References 139 publications

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“…Os principais processos relacionados ao comportamento ambiental de agrotóxicos são a lixiviação, escoamento superficial, volatilização, sorção e degradação (Köhne et al, 2009). A degradação é relevante para atenuação dos níveis de resíduos de um agrotóxico no solo e se refere ao seu processo de transformação em moléculas menores, de forma biótica ou abiótica tornando-os, na maioria dos casos, moléculas menos tóxicas (Oliveira & Brighenti, 2011).…”

Section: Introductionunclassified

Persistência de endossulfam e seu metabólito sulfato de endossulfam em condições de campo e laboratório

Júnior

Franco

Moraes

2013

Rev. bras. eng. agríc. ambient.

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RESUMOObjetivou-se, neste trabalho, avaliar a persistência e a lixiviação de endossulfam no campo e sua degradação e formação do metabólito sulfato de endossulfam em condições de laboratório. Visando ao experimento da persistência e à lixiviação no campo, amostras de solo até a profundidade de 100 cm foram coletadas aos 0, 41, 74 e 125 dias após aplicação. Em laboratório amostras de solo nas profundidades de 0-30 e 50-70 cm foram incubadas a 30 ± 2 °C e 80% da capacidade de campo e os resíduos de endossulfam e sulfato de endossulfam foram quantificados em função do tempo para ajuste dos modelos de cinética de primeira ordem e do modelo bifásico. Observou-se, no campo, que o endossulfam não lixiviou para menos de 10 cm de profundidade e houve uma rápida dissipação resultando em uma quantidade remanescente no perfil do solo (100 cm) inferior a 1% da dose aplicada aos 41 dias após a aplicação. Em laboratório os valores de TD 50 para o endossulfam variaram de 17 a 26 dias e para o sulfato de endossulfam de 26 a 59 dias. O modelo de degradação bifásico mostrou-se superior ao de cinética de primeira ordem para descrever a degradação do endossulfam em laboratório. Palavras-chave: degradação, meia-vida, lixiviação, dissipaçãoPersistence of endosulfan and its metabolite endosulfan sulfate under field and laboratory conditions ABSTRACT This study aimed to evaluate endosulfan leaching and persistence in the field as well as its degradation and formation of the metabolite endosulfan sulfate under laboratory conditions. For the persistence experiment and leaching in the field, soil samples until 100 cm depth were collected at 0, 41, 74, and 125 days after application. In the laboratory, soil samples of 0-30 cm and 50-70 cm depth were incubated at 30 ± 2 ºC and 80% field capacity and endosulfan residues were quantified as a function of time for adjusting the first order kinetics and biphasic models. In the field, it was observed that endosulfan did not leach beyond 10 cm depth and there was a rapid dissipation resulting in a quantity in the soil profile (100 cm) less than 1% of the applied dose at 41 days after application. In laboratory TD 50 values for endosulfan ranged from 17 to 26 days and endosulfan sulfate 26-59 days. The biphasic decay model was superior to the first-order kinetics to describe the degradation of endosulfan in the laboratory.

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Section: Introductionunclassified

Persistência de endossulfam e seu metabólito sulfato de endossulfam em condições de campo e laboratório

Júnior

Franco

Moraes

2013

Rev. bras. eng. agríc. ambient.

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“…Leaching and long term fate of non-conservative solutes such as pesticides and pharmaceutics is even far more difficult to predict as sorption behaviour and degradation processes come into play (Köhne et al, 2009b). Gärdenäs et al (2006) compared four different approaches to simulate long term soil water flows and pesticide transport at a tile drained field site in southern Sweden.…”

Section: Introductionmentioning

confidence: 99%

A novel explicit approach to model bromide and pesticide transport in connected soil structures

Klaus

Zehe

2011

Hydrol. Earth Syst. Sci.

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Abstract. The present study tests whether an explicit treatment of worm burrows and tile drains as connected structures is feasible for simulating water flow, bromide and pesticide transport in structured heterogeneous soils at hillslope scale. The essence is to represent worm burrows as morphologically connected paths of low flow resistance in a hillslope model. A recent Monte Carlo study (Klaus and Zehe, 2010, Hydrological Processes, 24, p. 1595-1609 revealed that this approach allowed successful reproduction of tile drain event discharge recorded during an irrigation experiment at a tile drained field site. However, several "hillslope architectures" that were all consistent with the available extensive data base allowed a good reproduction of tile drain flow response. Our second objective was thus to find out whether this "equifinality" in spatial model setups may be reduced when including bromide tracer data in the model falsification process. We thus simulated transport of bromide for the 13 spatial model setups that performed best with respect to reproduce tile drain event discharge, without any further calibration. All model setups allowed a very good prediction of the temporal dynamics of cumulated bromide leaching into the tile drain, while only four of them matched the accumulated water balance and accumulated bromide loss into the tile drain. The number of behavioural model architectures could thus be reduced to four. One of those setups was used for simulating transport of Isoproturon, using different parameter combinations to characterise adsorption according to the Footprint data base. Simulations could, however, only reproduce the observed leaching behaviour, when we allowed for retardation coefficients that were very close to one.

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“…The drawback of these approaches is that neither the exchange length nor the leakage parameter are 15 observable, and depend on model grid size and on event characteristics (Köhne et al, 2009a). …”

Section: Macropore-matrix-interactionmentioning

confidence: 99%

Ecohydrological particle model based on representative domains

Jackisch¹,

Zehe²

2017

Preprint

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Abstract. Non-uniform infiltration and subsurface flow in structured soils is observed in most natural settings. It arises from imperfect lateral mixing of fast advective flow in structures and diffusive flow in the soil matrix and remains one of the most challenging topics with respect to match observation and modelling of water and solutes at the plot scale.This study extends the fundamental introduction of a space-domain random walk of water particles as alternative approach to the Richards equation for diffusive flow (Zehe and Jackisch, 2016) to a stochastic-physical model framework simulating 5 soil water flow in a representative, structured soil domain. The central objective of the proposed model is the simulation of non-uniform flow fingerprints in different ecohydrological settings and antecedent states by making maximum use of field observables for parameterisation. Avoiding non-observable parameters for macropore-matrix exchange, an energy-balance approach to govern film flow in representative flow paths is employed. We present the echoRD model (ecohydrological particle model based on representative domains) and a series of application test cases. 10The model proves as a powerful alternative to existing dual-domain models, driven on experimental data and with selfcontrolled, dynamic macropore-matrix exchange from the topologically semi-explicitly defined structures.

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A review of model applications for structured soils: b) Pesticide transport

Cited by 179 publications

References 139 publications

Persistência de endossulfam e seu metabólito sulfato de endossulfam em condições de campo e laboratório

Persistência de endossulfam e seu metabólito sulfato de endossulfam em condições de campo e laboratório

A novel explicit approach to model bromide and pesticide transport in connected soil structures

Ecohydrological particle model based on representative domains

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