NDLI: Groundwater recharge rates for regional groundwater modelling: a case study using GROWA in the Lower Rhine lignite mining area, Germany

Content Provider	Springer Nature Link
Author	Herrmann, Frank Jahnke, Christoph Jenn, Florian Kunkel, Ralf Voigt, Hans Jürgen Voigt, Jens Wendland, Frank
Copyright Year	2009
Abstract	Groundwater recharge rates calculated with the GROWA model have been applied as the recharge boundary condition for the regional groundwater model Rurscholle. This model simulates groundwater dynamics in the Pleistocene aquifers of the Lower Rhine lignite mining area (Germany). GROWA uses an area-differentiated approach to calculate recharge rates depending on runoff-relevant site characteristics, which are represented by a set of baseflow indices. The regional accuracy of the coupled groundwater and GROWA models has been checked using groundwater hydrographs as validation criteria. The results suggest that the current (unadjusted) version of GROWA underestimates the regional groundwater recharge rate by 10–20 mm/yr. The comparative analysis identified areas where recharge calculations could be improved by adjusting the baseflow indices for areas where runoff is dominated by slope, low water-logging and a low degree of sealing. Using the adjusted set of baseflow indices, the mean groundwater recharge rate of the Rurscholle region was modelled as approx. 170 mm/yr. This study highlights the benefit of using a coupled approach and being able to independently calibrate and validate groundwater recharge boundary conditions in regional groundwater models.Les taux de recharge des aquifères calculés à l’aide du modèle GROWA ont été utilisés comme condition limite de recharge pour le modèle hydrogéologique de Rurscholle. Ce modèle estime la dynamique des aquifères pléistocènes de la région carbonifère du Bas Rhin en Allemagne. GROWA utilise une approche ajustée à la zone pour calculer les taux de recharge selon les caractéristiques spécifiques d’écoulement du site qui sont représentées par un jeu d’indices du flux de base. La précision régionale de l’hydrogéologie et des modèles GROWA a été testée par l’utilisation des hydrographes souterrains comme critères de validation. Les résultats suggèrent que la version actuelle de GROWA (non ajustée) sous-estime le taux de recharge régionale de 10 – 20 mm/an. L’analyse comparative a identifié les zones où les calculs de recharge peuvent être améliorés en ajustant les indices de flux de base dans les zones où le ruissellement est contrôlé par la pente, un faible rabattement et un faible degré de colmatage. En utilisant les indices de flux de base ajustés, le taux de recharge moyen des eaux souterraines de la région de Rurscholle a été modélisé approximativement à 170 mm/an. Cette étude souligne le bénéfice de l’utilisation d’une approche couplée et capable de calibrer et valider les conditions aux limites de recharge d’un aquifère de manière indépendante dans un modèle hydrogéologique régional.Los ritmos de recarga de las aguas subterráneas calculados con el modelo GROWA han sido aplicados con una condición de contorno de recarga para el modelo regional de aguas subterráneas Rurscholle. Este modelo simula la dinámica del agua subterránea en los acuíferos del Pleistoceno de la zona minera de lignito del Rhin inferior (Alemania). El GROWA utiliza una aproximación de área diferenciada para calcular los ritmos de recarga dependientes de las características relevantes del escurrimiento superficial del sitio, que está representada por un conjunto de índices de flujo base. La precisión regional de los modelos acoplados de aguas subterráneas el GROWA ha sido comprobada usando hidrogramas de aguas subterráneas como criterio de validación. Los resultados sugieren que la versión actual de GROWA (sin ajustar) subestima el ritmo de recarga regional de las aguas subterráneas en 10 – 20 mm/año. El análisis comparativo identificó áreas donde los cálculo de la recarga pudieron ser mejorados ajustando los índices del flujo base para áreas donde el escurrimiento superficial está dominado por la pendiente, pequeños anegamientos y un bajo grado de impermeabilización. Usando el conjunto ajustado de índices de flujo base, el ritmo medio de recarga de las aguas subterráneas de la región de Rurscholle resultó modelado en aproximadamente 170 mm/año. Este estudio resalta el beneficio de usar una aproximación acoplada y la capacidad de calibrar independientemente y validar las condiciones límites de la recarga subterránea en modelos regionales de aguas subterráneas.将通过GROWA模型计算出来的地下水补给速率作为地区的边界条件用于Rurscholle区域地下水模拟中。该模型模拟了德国莱茵河下游褐煤矿区更系统含水层的地下水动力情况。GROWA利用面积微分方法来计算由一系列基流指数代表的与径流相关的场地参数所决定的补给速率。利用地下水文过程图对地下水和GROWA耦合模型的区域精度进行了证实。结果显示, 目前未调整的GROWA版本对区域地下水补给速率低估了10-20 mm/yr。对比分析识别出在径流由坡面流,低渍水和低封闭性控制的地区, 能通过基流指数校正改进补给速率的计算。经过基流指数校正后, 模型计算出Rurscholle地区地下水平均补给速率接近170 mm/yr。本文突出体现了在区域地下水模型中利用耦合方法独立校正和证实地下水补给边界条件的效果。As taxas de recarga de águas subterrâneas calculadas com o modelo GROWA têm sido aplicadas como condição de fronteira no modelo de escoamento subterrâneo regional “Rurscholle”. Este modelo simula a dinâmica das águas subterrâneas nos aquíferos plistocénicos da zona de exploração mineira de lignito do Baixo Reno (Alemanha). O GROWA utiliza uma abordagem de área diferenciada para calcular taxas de recarga que dependem das características do local que sejam relevantes para a escorrência superficial e que são representadas por um conjunto de índices de escoamento de base. Verificou-se a precisão regional do modelo acoplado de escoamento subterrâneo e do GROWA, utilizando hidrogramas de águas subterrânea como critérios de validação. Os resultados sugerem que a versão actual (não ajustada) do GROWA subestima a taxa de recarga regional das águas subterrâneas em 10 – 20 mm/ano. Através da análise comparativa identificaram-se as áreas onde os cálculos de recarga podiam ser melhorados, ajustando os índices de escoamento de base em áreas onde a escorrência superficial é dominada pelo declive e por um baixo grau de impermeabilização e alagamento. Utilizando o conjunto de índices de escoamento de base ajustados, a taxa média de recarga das águas subterrâneas na região de Rurscholle foi modelada em aproximadamente 170 mm/ano. Este estudo realça a vantagem de utilizar uma abordagem acoplada e de conseguir calibrar e validar de forma independente as condições de fronteira referentes à recarga de águas subterrâneas em modelos regionais.
Starting Page	2049
Ending Page	2060
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	17
Issue Number	8
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2009-06-21
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater recharge/water budget Mining Numerical modeling GROWA Germany Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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