NDLI: Simulation of spatial and temporal trends in nitrate concentrations at the regional scale in the Upper Dyle basin, Belgium

Content Provider	Springer Nature Link
Author	César, E. Wildemeersch, S. Orban, Ph. Carrière, S. Brouyère, S. Dassargues, A.
Copyright Year	2014
Abstract	Models are the only tools capable of predicting the evolution of groundwater systems at a regional scale, by taking into account a large amount of information. This study presents the association of a water balance model (WetSpass) with a groundwater flow and solute transport model (SUFT3D, saturated and unsaturated flow and transport in 3D) in order to simulate the present and future groundwater quality in terms of nitrate in the Upper Dyle basin (439 km$^{2}$) Belgium. The HFEMC (hybrid finite element mixing cell) method implemented in the SUFT3D code is used to model groundwater flow and nitrate transport. Spatially distributed recharge, modelled with WetSpass, is considered for prescribing the recharge to the groundwater flow model. The feasibility of linking the WetSpass model with the finite-elements SUFT3D code is demonstrated. Time evolution and distribution of nitrate concentration are then simulated using the calibrated model. Nitrate inputs are spatially distributed according to land use. The spatial simulations and temporal trends are compared with previously published data on this aquifer and show good results.Les modèles sont les uniques outils qui, prenant en compte un grand nombre de données, permettent la prédiction de l’évolution des eaux souterraines à une échelle régionale. Cette étude présente l’association d’un modèle de bilan hydrique (WetSpass) avec un modèle de transport de flux d’eau souterraine et solutés (SUFT3D, saturated and unsaturated flow and transport in 3D) dans le but de simuler l’évolution présente et future de la qualité des eaux en termes de nitrates sur le haut bassin de la Dyle (439 km$^{2}$) en Belgique. La méthode HFEMC (hybrid finite element mixing cell) utilisée dans le code SUFT3D est adaptée pour le modèle de flux et de transport des nitrates. La recharge distribuée spatialement et modélisée par WetSpass est utilisée pour contrôler le modèle de flux. Les possibilités de lier le modèle WetSpass avec le modèle d’élément fini SUFT3D sont illustrées. L’évolution temporelle et la distribution des concentrations en nitrates peuvent ensuite être modélisées en utilisant le modèle calibré. Les entrées en nitrates sont spatialement distribuées selon l’occupation des sols. Les simulations spatiales et temporelles sont comparées aux données publiées précédemment sur cet aquifère et montrent de bons résultats.Los modelos son las únicas herramientas capaces de predecir la evolución de sistemas de agua subterránea a una escala regional, al tener en cuenta una gran cantidad de información. Este estudio presenta la asociación de un modelo de balance de agua (WetSpass) con un modelo de flujo de agua subterránea y de transporte de solutos (SUFT3D, saturated and unsaturated flow and transport in 3D) con el objeto de simular la calidad del agua subterránea presenta y futura en términos de nitratos en la cuenca Upper Dyle (439 km$^{2}$) Bélgica. El método HFEMC (hybrid finite element mixing cell) implementado en el código SUFT3D se usa para modelar el flujo de agua subterránea y el transporte de nitrato. Se considera a la recarga espacialmente distribuida, modelada con el WetSpass, para prescribir la recarga al modelo del flujo de agua subterránea. Se demuestra la factibilidad de vincular el modelo WetSpass con el código de elementos finitos SUFT3D. La evolución en el tiempo y la distribución de la concentración de nitrato son luego simulados usando el modelo calibrado. Las entradas de nitrato están espacialmente distribuidas de acuerdo al uso de la tierra. Las simulaciones de las tendencias espaciales y temporales son comparadas con los datos publicados previamente sobre este acuífero y muestra buenos resultados.在具有大量信息的情况下,模型是可预测区域尺度地下水系统演化的唯一工具。本研究展示了水平衡模型(WetSpass)与地下水流和溶质运移模型(SUFT3D,三维饱和和非饱和流及运移)的相关性,以便模拟比利时Dyle流域上游(439 km$^{2}$)硝酸盐含量方面目前和将来的地下水质。在地下水流和溶质运移模型中运行的的混成有限元混合单元方法被用于模拟地下水流和硝酸盐运移。用水平衡模型模拟的空间分布补给被认为是地下水流模型的补给。展示了水平衡模型与有限元SUFT3D代码的相结合的可能性。然后采用校正模型模拟了硝酸盐含量的时间演化和分布。硝酸盐输入是根据土地利用状况而呈空间分布。对空间模拟和时间上的趋势与过去出版的资料进行了比较,发现结果很好。Os modelos são as únicas ferramentas com capacidade de prever a evolução dos sistemas de águas subterrâneas à escala regional tomando em consideração uma grande quantidade de dados. Este estudo apresenta o acoplamento de um modelo de balanço hídrico (WetSpass) a um modelo de fluxo e transporte de solutos subterrâneos (SUFT3D, saturated and unsaturated flow and transport in 3D), a fim de simular a atual e a futura qualidade das águas subterrâneas em termos de nitratos na bacia hidrográfica do Alto Dyle (439 km$^{2}$) na Bélgica. O método HFEMC (hybrid finite element mixing cell), implementado no código SUFT3D, é usado para modelar o fluxo subterrâneo e o transporte de nitratos. Para quantificar a recarga no modelo de fluxo utiliza-se a recarga espacialmente distribuída modelada com WetSpass. Demonstra-se assim a viabilidade de acoplar o modelo WetSpass ao código SUFT3D de elementos finitos. Com base no modelo calibrado simula-se em seguida a evolução temporal e a distribuição de concentração dos nitratos. A introdução dos nitratos no modelo é espacialmente distribuída, de acordo com o uso do solo. As simulações espaciais e de tendências temporais são comparadas com dados publicados anteriormente sobre este aquífero, mostrando bons resultados.
Starting Page	1087
Ending Page	1100
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	22
Issue Number	5
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-03-28
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater modelling Nitrate WetSpass Spatially-distributed recharge Belgium 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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