NDLI: Influence of model conceptualisation on one-dimensional recharge quantification: Uley South, South Australia

Content Provider	Springer Nature Link
Author	Ordens, Carlos M. Post, Vincent E. A. Werner, Adrian D. Hutson, John L.
Copyright Year	2014
Abstract	Model conceptualisation is a key source of uncertainty in one-dimensional recharge modelling. The effects of different conceptualisations on transient recharge predictions for the semi-arid Uley South Basin, South Australia, were investigated. One-dimensional unsaturated zone modelling was used to quantify the effect of variations of (1) lithological complexity of the unsaturated zone, and (2) representation of preferential flow pathways. The simulations considered ranges of water-table depths, vegetation characteristics, and top soil thicknesses representative for the study area. Complex lithological profiles were more sensitive to the selected vegetation characteristics and water-table depth. Scenarios considering runoff infiltration into, and preferential flow through sinkholes resulted in higher and faster recharge rates. A comparison of modelled and field-based recharge estimates indicated that: (1) the model simulated plausible recharge rates, (2) only the models with preferential flow correctly reproduced the timing of recharge, and (3) preferential flow is probably redistributed in the unsaturated zone rather than passing to the water table directly. Because different but equally plausible conceptual models produce widely varying recharge rates, field-based recharge estimates are essential to constrain the modelling results.La conception du modèle est la source principale d’incertitude dans la modélisation de la recharge unidimensionnelle. Les conséquences de conceptions différentes sur la prédiction de la recharge transitoire dans le semi aride Uley South Basin, South Australia, sont examinées. Un modèle unidimensionnel de la zone non saturée a été utilisé pour évaluer les effets des variations de (1) la complexité lithologique de la zone non saturée et (2) de la représentation des voies d’écoulement préférentiel. Les simulations prennent en compte des gammes de profondeurs de la surface libre de la nappe, des caractéristiques de la végétation et des épaisseurs de sol superficiel représentatives de la zone d’étude. Les profils lithologiques complexes sont plus sensibles aux caractéristiques de la végétation considérée et à la profondeur de la surface libre de la nappe. Les scénarios considérant la perte d’eau par infiltration directe et à travers des chenaux préférentiels conduisent à des taux de recharge plus élevés et plus rapides. La comparaison des évaluations de la recharge d’après le modèle et d’après le terrain indique que: (1) le modèle simule des taux de recharge plausibles, (2) seuls les modèles à écoulement préférentiel reproduisent correctement l’évolution de la recharge dans le temps (3) le flux préférentiel transite plutôt par la zone non saturée que par les zones d’écoulement direct vers la surface de la nappe. Parce que des modèles différents, mais également plausibles, conduisent à des ratios de recharge largement variables, les évaluations de la recharge sur le terrain sont essentielles pour caler le modèle utilisé.La conceptualización de los modelos es una fuente clave de incerteza en la modelación de la recarga unidimensional. Se investigaron los efectos de diferentes conceptualizaciones en las predicciones de la recarga transitoria para la cuenca semiárida de Uley South, Australia del Sur. Se usó la modelización unidimensional de la zona no saturada para cuantificar los efectos de las variaciones de (1) la complejidad litológica de la zona no saturada, y (2) la representación de trayectorias preferenciales de flujos. Las simulaciones consideraron intervalos de profundidades del nivel freático, las características de la vegetación, y el espesor de la capa de suelo representativa para el área de estudio. Los perfiles litológicos complejos fueron más sensibles a las características de la vegetación seleccionada y a la profundidad del nivel freático. Los escenarios que consideran la infiltración y el flujo preferencial a través de los sumideros resultaron en mayores y más rápidos ritmos de recarga. Una comparación de la recarga estimada a partir del modelado y de datos de campo indicaron que: (1) el modelo simulaba ritmos de recarga razonables, (2) sólo los modelos con flujo preferencial reprodujeron correctamente el tiempo de recarga, y (3) el flujo preferencial está probablemente redistribuido en la zona no saturada en lugar de pasar directamente al nivel freático. Debido a que diferentes, pero igualmente razonables modelos conceptuales, producen una amplia variación de los ritmos de recarga, las estimaciones de la recarga provenientes de datos de campo son esenciales para restringir los resultados de la modelación.模型概念化是一维补给模拟中的一个关键不确定源。调查了南澳大利亚半干旱Uley South盆地不同概念化对瞬时补给预测的影响。采用一维非饱和带模拟对非饱和带岩性复杂性的变化影响和优先流的表现变化影响进行了量化。模拟考虑了研究区有代表性的水位深度的范围、植被特征和表层土壤厚度。复杂的岩性剖面对选择的植被特征和水位深度更敏感。考虑径流渗入落水洞及优先流通过落水洞的方案导致更高和更快的补给量。模拟的和基于室外的补给估算比较显示:(1)模型模拟了似乎可信的补给量;(2)只有优先流模型正确地重现了补给时间的选择;(3)优先流可能在非饱和带被重新分配,而不是直接流到水位。由于不同的但同样似乎可信的概念模型得到变化相当大的补给量,因此,基于室外的补给估算对约束模拟结果必不可少。A concetualização do modelo é uma das principais fontes de incerteza na modelação da recarga unidimensional. Foram investigados os efeitos de diferentes concetualizações sobre as previsões da recarga variável para a Bacia semiárida de Uley South, no sul da Austrália. A modelação unidimensional da zona não saturada foi usada para quantificar o efeito das variações da (1) complexidade litológica da zona não saturada, e (2) representação de caminhos preferenciais de fluxo. As simulações consideraram os intervalos de profundidade do nível freático, as caraterísticas da vegetação e as espessuras do solo superficial representativas para a área de estudo. Perfis litológicos complexos foram mais sensíveis às caraterísticas da vegetação selecionadas e à profundidade do nível freático. Os cenários considerando infiltração do escoamento e fluxo preferencial através de sumidouros resultaram em taxas de recarga maiores e mais rápidas. A comparação entre as estimativas de recarga do modelo e as baseadas em dados de campo indica que: (1) o modelo simulou taxas de recarga plausíveis, (2) só os modelos com fluxo preferencial reproduziram corretamente os tempos de recarga, e (3) o fluxo preferencial é provavelmente redistribuído na zona não saturada, em vez de passar diretamente para a zona freática. Uma vez que modelos concetuais diferentes, mas igualmente plausíveis, produzem taxas de recarga amplamente variáveis, a estimativas da recarga com base em dados de campo são essenciais para restringir os resultados da modelação.
Starting Page	795
Ending Page	805
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	22
Issue Number	4
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-18
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater recharge Unsaturated zone modelling Conceptual models Preferential flow Australia Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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