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    Titre: Deterministic and probabilistic numerical modelling towards sustainable groundwater management : application to seawater intrusion in the Korba aquifer (Tunisia) / Jaouher Kerrou
    Auteur: Kerrou, Jaouher
    Editeur: Neuchâtel : Université de Neuchâtel
    Date: 2008
    Collation: 181 p. : ill.
    Note: Th. Univ. de Neuchâtel, 2008 - Existe aussi sous forme électronique
    No RERO: R004931301
    Existe sous différentes formes: Deterministic and probabilistic numerical modelling towards sustainable groundwater management
    Permalien:
    http://data.rero.ch/01-R004931301/html

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    A numerical analysis of dimensionality and heterogeneity effects on advective dispersive seawater intrusion processes

    Kerrou, Jaouher
    Renard, Philippe
    Hydrogeology Journal. - 2010/18/1/55-72
    2010
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    Titre: A numerical analysis of dimensionality and heterogeneity effects on advective dispersive seawater intrusion processes
    Auteur: Kerrou, Jaouher
    Contributeur: Renard, Philippe
    Date: 2010
    Sujet: Heterogeneity - Seawater intrusion - Monte Carlo simulations - Effective parameters - Salt-water/fresh-water relations
    Description: Two-dimensional (2D) and 3D numerical simulations of the dispersive Henry problem show that heterogeneity affects seawater intrusion differently in 2D and 3D. When the variance of a multi-Gaussian isotropic hydraulic conductivity field increases, the penetration of the saltwater wedge decreases in 2D while it increases in 3D. This is due to the combined influence of advective and dispersive processes which are affected differently by heterogeneity and problem dimensionality. First, the equivalent hydraulic conductivity controls the mean head gradient and therefore the position of the wedge. For an isotropic medium, increasing the variance increases the equivalent conductivity in 3D but not in 2D. Second, the macrodispersion controls the rotation of the saltwater wedge by affecting the magnitude of the density contrasts along the saltwater wedge. An increased dispersion due to heterogeneity leads to a decreasing density contrast and therefore a smaller penetration of the wedge. The relative magnitude of these two opposite effects depends on the degree of heterogeneity, anisotropy of the medium, and dimension. Investigating these effects in 3D is very heavy numerically; as an alternative, one can simulate 2D heterogeneous media that approximate the behaviour of the 3D ones, provided that their statistical distribution is rescaled.
    Publication en relation: Hydrogeology Journal. - 2010/18/1/55-72
    Document hôte: Hydrogeology Journal
    Identifiant: 10.1007/s10040-009-0533-0 (DOI)

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    Titre: A numerical analysis of dimensionality and heterogeneity effects on advective dispersive seawater intrusion processes = Analyse numérique des effets dimensionnels et des hétérogénéités sur les intrusions d'eau marine en milieu dispersif
    Auteur: Kerrou, Jaouher
    Contributeur: Renard, Philippe
    Sujet: Heterogeneity - Seawater intrusion - Monte Carlo simulations - Effective parameters - Salt-water/fresh-water relations
    Description: Two-dimensional (2D) and 3D numerical simulations of the dispersive Henry problem show that heterogeneity affects seawater intrusion differently in 2D and 3D. When the variance of a multi-Gaussian isotropic hydraulic conductivity field increases, the penetration of the saltwater wedge decreases in 2D while it increases in 3D. This is due to the combined influence of advective and dispersive processes which are affected differently by heterogeneity and problem dimensionality. First, the equivalent hydraulic conductivity controls the mean head gradient and therefore the position of the wedge. For an isotropic medium, increasing the variance increases the equivalent conductivity in 3D but not in 2D. Second, the macrodispersion controls the rotation of the saltwater wedge by affecting the magnitude of the density contrasts along the saltwater wedge. An increased dispersion due to heterogeneity leads to a decreasing density contrast and therefore a smaller penetration of the wedge. The relative magnitude of these two opposite effects depends on the degree of heterogeneity, anisotropy of the medium, and dimension. Investigating these effects in 3D is very heavy numerically; as an alternative, one can simulate 2D heterogeneous media that approximate the behaviour of the 3D ones, provided that their statistical distribution is rescaled
    Publication en relation: Hydrogeology Journal. - 2010/18/1/55-72
    Document hôte: Hydrogeology Journal
    Identifiant: 10.1007/s10040-009-0533-0 (DOI)

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    A numerical analysis of dimensionality and heterogeneity effects on advective dispersive seawater intrusion processes

    Kerrou, Jaouher, Renard, Philippe
    Hydrogeology Journal, 2010, Vol.18(1), pp.55-72 [Revue évaluée par les pairs]
    Springer Science & Business Media B.V.
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    Titre: A numerical analysis of dimensionality and heterogeneity effects on advective dispersive seawater intrusion processes
    Auteur: Kerrou, Jaouher; Renard, Philippe
    Sujet: Heterogeneity ; Seawater intrusion ; Monte Carlo simulations ; Effective parameters ; Salt-water/fresh-water relations
    Description: Two-dimensional (2D) and 3D numerical simulations of the dispersive Henry problem show that heterogeneity affects seawater intrusion differently in 2D and 3D. When the variance of a multi-Gaussian isotropic hydraulic conductivity field increases, the penetration of the saltwater wedge decreases in 2D while it increases in 3D. This is due to the combined influence of advective and dispersive processes which are affected differently by heterogeneity and problem dimensionality. First, the equivalent hydraulic conductivity controls the mean head gradient and therefore the position of the wedge. For an isotropic medium, increasing the variance increases the equivalent conductivity in 3D but not in 2D. Second, the macrodispersion controls the rotation of the saltwater wedge by affecting the magnitude of the density contrasts along the saltwater wedge. An increased dispersion due to heterogeneity leads to a decreasing density contrast and therefore a smaller penetration of the wedge. The relative magnitude of these two opposite effects depends on the degree of heterogeneity, anisotropy of the medium, and dimension. Investigating these effects in 3D is very heavy numerically; as an alternative, one can simulate 2D heterogeneous media that approximate the behaviour of the 3D ones, provided that their statistical distribution is rescaled. Des simulations bi et tri dimensionnelles du problème de Henry relatif à la dispersion montrent que l’hétérogénéité affecte l’intrusion marine différemment en 2D et 3D. Quand la variance d’un champ de conductivité hydraulique isotrope multi-gaussien s’accoît, la pénétration du biseau salé diminue en 2D, tandis qu’elle augmente en 3D. Ceci est dû à l’influence combinée de processus advectifs et dispersifs, affectés de façon différente par l’hétérogénéité et par la dimensionnalité. Tout d’abord, la conductivité hydraulique équivalente contrôle le gradient de charge moyen et par suite la position du biseau. Dans un milieu isotrope, l’augmentation de la variance augmente la conductivité équivalente en 3D, mais pas en 2D. Deuxièmement, la macrodispersion contrôle la déviation du biseau salé en affectant l’amplitude des contrastes de densité le long du biseau. Une augmentation de la dispersion liée à l’hétérogénéité conduit à une diminution du contraste de densité et par suite à une moindre avancée du biseau. La résultante de ces deux effets antagonistes dépend des degrés d’hétérogénéité, d’anisotropie et des dimensions du milieu. La simulation numérique de ces effets en 3D est très complexe; on peut lui substituer une simulation en 2D dans un milieu hétérogène reproduisant approximativement le comportement d’un milieu 3D, à condition que leurs distributions statistiques soient équivalentes. Simulaciones numéricas bidimensionales (2D) y tridimensionales (3D) del problema dispersivo de Henry muestran que la heterogeneidad afecta la intrusión de agua de mar de manera diferente en 2D y 3D. Cuando la varianza de un campo isotrópico multi- Gausiano de conductividad hidráulica se incrementa, la penetración de la cuña de agua salada decrece en 2D mientras se incrementa 3D. Esto es debido a la influencia combinada de procesos dispersivos y advectivos que se ven afectados de diferente forma por la heterogeneidad y el problema de la dimensionalidad. Primero, la conductividad hidráulica equivalente controla el gradiente hídrico medio y por lo tanto la posición de la cuña. Para un medio isotrópico, al incrementar la varianza se incrementa la conductividad equivalente en 3D pero no en 2D. Segundo, la macrodispersión controla la rotación de la cuña de agua salada afectando la magnitud de los contrastes de densidad a lo largo de la cuña de agua salada. Un incremento en la dispersión debido a la heterogeneidad conduce a un decrecimiento del contraste de la densidad y por lo tanto una menor penetración de la cuña. La magnitud relativa de estos dos efectos opuestos depende del grado de heterogeneidad, la anisotropía del medio, y la dimensión. Investigar estos efectos en 3D es numéricamente muy pesado, como una alternativa, uno puede simular un medio heterogéneo en 2D que se aproxima al comportamiento del 3D, con la condición que su distribución estadísticas sea reescalada. 弥散亨利问题的二维 (2D) 和三维 (3D) 数值模拟表明非均质性对海水入侵的影响在2D和3D条件下有所不同. 当多高斯各向同性渗透系数场的变异增加时, 盐水楔的楔入在2D条件下减弱, 在3D条件下则增强. 这是由于对流和弥散过程的综合影响, 而这两个过程又受非均质性和问题维数不同的影响. 首先, 等效渗透系数控制平均水力坡度, 因此控制着盐水楔的位置. 对于各向同性介质, 如增加变异, 则3D条件下的等效渗透系数增加, 而2D条件下则不变. 其次, 宏观弥散通过影响沿盐水楔密度差异的数量级控制着盐水楔的转动. 由于非均质性引起的弥散增加使密度差异降低, 盐水楔的楔入减弱. 这两个相反影响的相对幅度取决于非均质程度, 介质的各向异性和维数. 应用数值模拟在3D条件下查明这些影响型工作量很大, 作为替代方案, 在其统计分布重新标定的情况下, 可以通过模拟2D非均质介质来近似三维. Simulações numéricas bidimensionais (2D) e 3D do problema dispersivo de Henry mostram que a heterogeneidade afecta a intrusão marinha de forma diferente em 2D e 3D. Quando a variância multi–Gaussiana da condutividade hidráulica isotrópica aumenta, a penetração da cunha de água salina diminui em 2D, enquanto aumenta em 3D. Isto é devido à influência combinada dos processos advectivos e dispersivos, os quais são afectados de maneira diferente pela heterogeneidade e dimensão do problema. Primeiro, a condutividade hidráulica equivalente controla o gradiente médio e, por conseguinte, a posição da cunha. Para um meio isotrópico, incrementando a variância incrementa–se a condutividade equivalente em 3D, mas não em 2D. Em segundo lugar, a macro–dispersão controla a rotação da cunha de água salgada, afectando a magnitude dos contrastes de densidade ao longo da cunha salina. Uma maior dispersão devido à heterogeneidade leva a um decréscimo dos contrastes de densidade e, portanto, a uma menor penetração da cunha. A importância relativa desses dois efeitos opostos depende do grau de heterogeneidade, da anisotropia do meio, e da dimensão. Investigar esses efeitos em 3D é, do ponto de vista numérico, muito pesado, logo, como alternativa, pode simular-se um meio heterogéneo 2D que aproxime o comportamento obtido em 3D, desde que a sua distribuição estatística seja redimensionada.
    Fait partie de: Hydrogeology Journal, 2010, Vol.18(1), pp.55-72
    Identifiant: 1431-2174 (ISSN); 1435-0157 (E-ISSN); 10.1007/s10040-009-0533-0 (DOI)

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    Status of the Korba groundwater resources (Tunisia): observations and three-dimensional modelling of seawater intrusion

    Kerrou, Jaouher, Renard, Philippe, Tarhouni, Jamila
    Hydrogeology Journal, 2010, Vol.18(5), pp.1173-1190 [Revue évaluée par les pairs]
    Springer Science & Business Media B.V.
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    Titre: Status of the Korba groundwater resources (Tunisia): observations and three-dimensional modelling of seawater intrusion
    Auteur: Kerrou, Jaouher; Renard, Philippe; Tarhouni, Jamila
    Sujet: Seawater intrusion ; Numerical modelling ; Remote sensing ; Multivariate statistics ; Tunisia
    Description: The Korba aquifer is located in the east of the Cape Bon peninsula in Tunisia. A large groundwater depression has been created in the central part of the aquifer since the 1980s, due to intense groundwater pumping for irrigation. The data collected show that the situation continues to deteriorate. Consequently, seawater is continuing to invade a large part of the aquifer. To better understand the situation and try to forecast its evolution, a three-dimensional (3D) transient density-dependent groundwater model has been developed. The model building process was difficult because of data required on groundwater discharge from thousands of unmonitored private wells. To circumvent that difficulty, indirect exhaustive information including remote sensing data and the physical parameters of the aquifer have been used in a multi-linear regression framework. The resulting 3D model shows that the aquifer is over-exploited. It also shows that after 50 years of exploitation, the time needed to turn back to the natural situation would be about 150 years if the authorities would ban all exploitation now. Such an asymmetry in the time scales required to contaminate or remediate an aquifer is an important characteristic of coastal aquifers that must be taken into account in their management. L’aquifère de Korba est localisé à l’est de la péninsule du Cap Bon en Tunisie. Une large dépression d’eau souterraine a été créée dans la partie centrale de l’aquifère depuis les années 80 à cause d’un pompage intense des eaux souterraines, utilisées pour l’irrigation. Les données collectées montrent que la situation continue à se détériorer. En conséquence, l’eau de mer continue d’envahir une grande partie de l’aquifère. Pour mieux comprendre cette situation et essayer d’estimer l’évolution de l’intrusion, un modèle hydrogéologique tridimensionnel en régime transitoire et à densité variable a été développé. La construction du modèle a été difficile à cause du manque de données sur les pompages à partir de milliers de puits privés non contrôlés. Pour résoudre cette difficulté, l’information exhaustive indirecte incluant les données d'images satellites et les paramètres physiques de l’aquifère a été utilisée dans une analyse de régression multilinéaire. Le résultat du modèle 3D montre que l’aquifère est surexploité. Il indique aussi qu’après 50 ans d’exploitation le temps nécessaire au retour à la situation naturelle serait d’environ 150 ans dans le cas où dans le cas où les autorités interdisent toute exploitation de l’aquifère. Cette asymétrie dans l’échelle de temps nécessaire pour contaminer ou améliorer un aquifère est une importante caractéristique des aquifères côtiers qui doit être prise en compte pour leur gestion. El acuífero Korba está localizado en el este de la península Cape Bon en Túnez. Una gran depresión de aguas subterráneas fue creada en la parte central del acuífero desde los años 1980, debido a un bombeo intenso de aguas subterráneas para la irrigación. Los datos colectados muestran que la situación continúa deteriorándose. Consecuentemente, el agua de mar está continuamente invadiendo una gran parte del acuífero. Para entender mejor la situación y tratar de pronosticar su evolución, se desarrolló un modelo tridimensional (3D) transitorio de aguas subterráneas dependiente de la densidad. El proceso de confección del modelo fue dificultoso debido a que los datos necesarios sobre la descarga de aguas subterráneas provienen de miles de pozos privados no monitoreados. Para salvar esta dificultad, se utilizaron la información exhaustiva indirecta que incluye datos de sensores remotos y los parámetros físicos del acuífero en un marco de regresión multi-lineal. El modelo 3D resultante muestra que el acuífero es sobreexplotado. También muestra que después de 50 años de explotación, el tiempo requerido para retornar a la situación natural sería de alrededor de 150 años si las autoridades prohibieran toda la explotación ahora. Semejante asimetría en las escalas de tiempo requeridas para contaminar o remediar un acuífero constituyen una característica importante de los acuíferos costeros que deberían ser tenidos en cuenta en su manejo. Korba含水层位于突尼斯Cape Bon半岛东部。由于1980s以来大量抽取地下水用于灌溉, 在含水层中部已形成大面积的地下水降落漏斗。收集到的资料表明形势仍持续恶化。结果, 海水继续入侵大部分含水层。为了更好地了解状况, 并尝试预测其演化, 建立了一个三维 (3D) 非稳态变密度地下水模型。模型的建立过程很困难, 因为需要从数千口的未作监测的私用井取得所需的地下水排泄量数据。为了解决这些困难, 将各种间接的信息, 包括遥感数据和含水层的物理参数纳入一个多线性回归框架中。三维模拟结果表明含水层处于超采状态。模型还显示, 在开采50后, 如果当局从现在开始全面禁止开采, 要恢复到天然状态也将需要约150年。污染和修复一个含水层的时间尺度如此不对称。这是海岸带含水层的一个重要特征, 在管理当中须作考虑。 O aquífero de Korba está localizado na parte leste da península de Cap Bon na Tunísia. Desde 1980 que foi criada uma grande depressão piezométrica na parte central do aquífero, devido a uma intensa exploração de águas subterrâneas para a agricultura. Os dados observados mostram que a situação se continua a deteriorar. Em consequência, a água do mar continua a invadir uma grande parte do aquífero. Para melhor se compreender a situação e tentar prever a sua evolução, foi desenvolvido um modelo 3-D em regime variável em função da densidade. O processo de construção do modelo foi difícil, devido à carência de dados de milhares de furos privados, não monitorizados. Para ultrapassar esta dificuldade, toda a informação indirecta, incluindo detecção remota e parâmetros físicos do aquífero, foi utilizada para um estudo de regressão inversa multi-linear. O modelo 3-D resultante mostra que o aquífero está numa situação de sobre-exploração. Mostra também que, após 50 anos de exploração, o tempo necessário para recuperação e retorno à situação natural seria de 150 anos, mesmo que as autoridades banissem toda a exploração neste mesmo momento. Tal assimetria nas escalas temporais para contaminar o aquífero e para o recuperar constitui uma das características mais importantes dos aquíferos costeiros, a qual deve ser tomada em consideração na sua gestão.
    Fait partie de: Hydrogeology Journal, 2010, Vol.18(5), pp.1173-1190
    Identifiant: 1431-2174 (ISSN); 1435-0157 (E-ISSN); 10.1007/s10040-010-0573-5 (DOI)

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    Stochastic forecasts of seawater intrusion towards sustainable groundwater management: application to the Korba aquifer (Tunisia)

    Kerrou, Jaouher, Renard, Philippe, Cornaton, Fabien, Perrochet, Pierre
    Hydrogeology Journal, 2013, Vol.21(2), pp.425-440 [Revue évaluée par les pairs]
    Springer Science & Business Media B.V.
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    Titre: Stochastic forecasts of seawater intrusion towards sustainable groundwater management: application to the Korba aquifer (Tunisia)
    Auteur: Kerrou, Jaouher; Renard, Philippe; Cornaton, Fabien; Perrochet, Pierre
    Sujet: Seawater intrusion ; Uncertainty ; Geostatistics ; Climate change ; Tunisia
    Description: A stochastic study of long-term forecasts of seawater intrusion with an application to the Korba aquifer (Tunisia) is presented. Firstly, a geostatistical model of the exploitation rates was constructed, based on a multi-linear regression model combining incomplete direct data and exhaustive secondary information. Then, a new method was designed and used to construct a geostatistical model of the hydraulic conductivity field by combining lithological information and data from hydraulic tests. Secondly, the effects of the uncertainties associated with the pumping rates and the hydraulic conductivity field on the 3D density-dependent transient model were analysed separately and then jointly. The forecasts of the impacts of two different management scenarios on seawater intrusion in the year 2048 were performed by means of Monte Carlo simulations, accounting for uncertainties in the input parameters as well as possible changes of the boundary conditions. Combining primary and secondary data allowed maps of pumping rates and the hydraulic conductivity field to be constructed, despite a lack of direct data. The results of the stochastic long-term forecasts showed that, most probably, the Korba aquifer will be subject to important losses in terms of regional groundwater resources. On présente ici une étude stochastique des prévisions à long terme de l’intrusion marine, avec son application à l’aquifère de Korba (Tunisie). En premier lieu, un modèle géostatistique des débits d’exploitation a été construit sur la base d’un modèle de régression multilinéaire combinant des données directes incomplètes et des informations secondaires exhaustives. Ensuite, on a élaboré et utilisé une nouvelle méthodologie de construction d’un modèle géostatistique du champ de conductivité hydraulique en combinant des données lithologiques et des données issues des tests hydrauliques. Dans un second temps, on a analysé séparément puis conjointement les effets des incertitudes associées aux débits de pompage et au champ de conductivité hydraulique sur le modèle transitoire 3D avec effet de densité. Les prévisions des impacts sur l’intrusion saline de deux scénarios différents de gestion à l’horizon 2048 ont été calculés au moyen de simulations de Monte Carlo, tenant compte à la fois de l’incertitude sur les paramètres d’entrée et de possibles changements dans les conditions aux limites. La combinaison de données principales et secondaires a permis la construction de cartes de débits d’exploitation et de champ de conductivité hydraulique malgré le manque d’information directe. Les résultats des prévisions stochastiques à long terme montrent que l’aquifère de Korba subira très probablement d’importantes pertes des ressources en eaux souterraines. Se presenta un estudio estocástico a largo plazo de pronóstico de la intrusión de agua de mar con una aplicación al acuífero de Korba (Túnez). En primer lugar, se construyó un modelo geoestadístico de los caudales de explotación, basado en un modelo de regresión multi linear combinando datos directos incompletos y información secundaria exhaustiva. Luego, se diseñó y usó un método para construir un nuevo modelo geoestadístico del campo de conductividad hidráulica combinando información litológica y datos de ensayos de bombeo. En segundo lugar, se analizaron separada y conjuntamente, los efectos de las incertezas asociadas con los caudales de bombeo y el campo de conductividad hidráulica en un modelo transitorio tridimensional dependiente de la densidad. Se realizaron pronósticos de los impactos de dos escenarios diferentes de gestión sobre la intrusión de agua de mar en el año 2048 por medio de simulaciones de Monte Carlo, teniendo en cuenta las incertezas en los parámetros de entrada así como posibles cambios de las condiciones de borde. La combinación de datos primarios y secundarios permitió construir mapas de los caudales de bombeo y de los campos de conductividad hidráulica, a pesar de una falta de datos directos. Los resultados de los pronósticos estocásticos a largo plazo mostraron que, muy probablemente, el acuífero de Korba estará sujeto a pérdidas importantes en términos de los recursos regionales de agua subterránea. 本文研究了对海水入侵的长期预测随机模型在Korba含水层(突尼斯)的应用。首先,本文在结合了不完全的直接资料和详尽的次级资料的多线性回归模型的基础上,建立了开采率的地质统计模型。然后,文中设计了一种新方法,通过与岩性资料和水力试验得到数据相结合来建立渗透系数场的地质统计模型。第二,文中单独并联合分析了与抽水率、在密度有关的3D传导模型中的渗透系数场有关的不确定性的影响。利用蒙特卡罗模拟,本文预测了到2048年时两种不同的管理情景对海水入侵的影响,解释了输入参数的不确定性和边界条件可能发生的变化。虽然缺乏直接资料,通过综合考虑主要资料和次级资料,文中建立了抽水率和渗透系数场图。随机长期预测的结果显示,就区域地下水资源而言,Korba含水层的水量很有可能会大幅度减少。 É apresentado um estudo estocástico de previsões a longo prazo de intrusão marinha com aplicação ao aquífero Korba (Tunísia). Em primeiro lugar foi construído um modelo geoestatístico das taxas de extração, baseado num modelo de regressão multi-linear que combina dados diretos incompletos com informação secundária exaustiva. Depois, foi desenvolvido e utilizado um novo método para construir um modelo geoestatístico do campo de condutividade hidráulica, através da combinação de informação litológica com dados de ensaios hidráulicos. Em segundo lugar, foram analisados, separadamente e depois conjuntamente, os efeitos das incertezas associadas às taxas de bombagem e ao campo de condutividade hidráulica no modelo 3-D transitório dependente da densidade. Foram realizadas as previsões dos impactes de dois cenários distintos de gestão na intrusão marinha no ano de 2048, através de simulações de Monte Carlo, tendo em conta as incertezas nos parâmetros de entrada, assim como eventuais alterações das condições de fronteira. Não obstante a escassez de dados diretos, a combinação de dados primários e secundários permitiu construir mapas de taxas de bombagem e do campo da condutividade hidráulica. Os resultados das previsões estocásticas a longo prazo mostraram que, muito provavelmente, o aquífero Korba vai estar sujeito a perdas importantes em termos de recursos hídricos subterrâneos regionais.
    Fait partie de: Hydrogeology Journal, 2013, Vol.21(2), pp.425-440
    Identifiant: 1431-2174 (ISSN); 1435-0157 (E-ISSN); 10.1007/s10040-012-0911-x (DOI)

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    Titre: Status of the Korba groundwater resources (Tunisia): observations and three-dimensional modelling of seawater intrusion = Statut des ressources en eau souterraine à Korba (Tunisie): observations et modélisation tridimensionnelle de l'intrusion d'eau de mer
    Auteur: Kerrou, Jaouher
    Contributeur: Renard, Philippe; Tarhouni, Jamila
    Sujet: Seawater intrusion - Numerical modelling - Remote sensing - Multivariate statistics - Tunisia
    Description: The Korba aquifer is located in the east of the Cape Bon peninsula in Tunisia. A large groundwater depression has been created in the central part of the aquifer since the 1980s, due to intense groundwater pumping for irrigation. The data collected show that the situation continues to deteriorate. Consequently, seawater is continuing to invade a large part of the aquifer. To better understand the situation and try to forecast its evolution, a three-dimensional (3D) transient density-dependent groundwater model has been developed. The model building process was difficult because of data required on groundwater discharge from thousands of unmonitored private wells. To circumvent that difficulty, indirect exhaustive information including remote sensing data and the physical parameters of the aquifer have been used in a multi-linear regression framework. The resulting 3D model shows that the aquifer is over-exploited. It also shows that after 50 years of exploitation, the time needed to turn back to the natural situation would be about 150 years if the authorities would ban all exploitation now. Such an asymmetry in the time scales required to contaminate or remediate an aquifer is an important characteristic of coastal aquifers that must be taken into account in their management
    Publication en relation: Hydrogeology Journal. - 2010/18/5/1173-1190
    Document hôte: Hydrogeology Journal
    Identifiant: 10.1007/s10040-010-0573-5 (DOI)

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    Status of the Korba groundwater resources (Tunisia): observations and three-dimensional modelling of seawater intrusion

    Kerrou, Jaouher
    Renard, Philippe, Tarhouni, Jamila
    Hydrogeology Journal. - 2010/18/5/1173-1190
    2010
    Disponible
    Plus…
    Aucune localisation rattachée
    Titre: Status of the Korba groundwater resources (Tunisia): observations and three-dimensional modelling of seawater intrusion
    Auteur: Kerrou, Jaouher
    Contributeur: Renard, Philippe; Tarhouni, Jamila
    Date: 2010
    Sujet: Seawater intrusion - Numerical modelling - Remote sensing - Multivariate statistics - Tunisia
    Description: The Korba aquifer is located in the east of the Cape Bon peninsula in Tunisia. A large groundwater depression has been created in the central part of the aquifer since the 1980s, due to intense groundwater pumping for irrigation. The data collected show that the situation continues to deteriorate. Consequently, seawater is continuing to invade a large part of the aquifer. To better understand the situation and try to forecast its evolution, a three-dimensional (3D) transient density-dependent groundwater model has been developed. The model building process was difficult because of data required on groundwater discharge from thousands of unmonitored private wells. To circumvent that difficulty, indirect exhaustive information including remote sensing data and the physical parameters of the aquifer have been used in a multi-linear regression framework. The resulting 3D model shows that the aquifer is over-exploited. It also shows that after 50 years of exploitation, the time needed to turn back to the natural situation would be about 150 years if the authorities would ban all exploitation now. Such an asymmetry in the time scales required to contaminate or remediate an aquifer is an important characteristic of coastal aquifers that must be taken into account in their management.
    Publication en relation: Hydrogeology Journal. - 2010/18/5/1173-1190
    Document hôte: Hydrogeology Journal
    Identifiant: 10.1007/s10040-010-0573-5 (DOI)

    • Article
    Sélectionner

    Status of the Korba groundwater resources (Tunisia): observations and three-dimensional modelling of seawater intrusion

    Kerrou, Jaouher
    Renard, Philippe, Tarhouni, Jamila
    Hydrogeology Journal. - 2010/18/5/1173-1190
    2010
    Disponible
    Plus…
    Aucune localisation rattachée
    Titre: Status of the Korba groundwater resources (Tunisia): observations and three-dimensional modelling of seawater intrusion
    Auteur: Kerrou, Jaouher
    Contributeur: Renard, Philippe; Tarhouni, Jamila
    Date: 2010
    Sujet: Seawater intrusion - Numerical modelling - Remote sensing - Multivariate statistics - Tunisia
    Description: The Korba aquifer is located in the east of the Cape Bon peninsula in Tunisia. A large groundwater depression has been created in the central part of the aquifer since the 1980s, due to intense groundwater pumping for irrigation. The data collected show that the situation continues to deteriorate. Consequently, seawater is continuing to invade a large part of the aquifer. To better understand the situation and try to forecast its evolution, a three-dimensional (3D) transient density-dependent groundwater model has been developed. The model building process was difficult because of data required on groundwater discharge from thousands of unmonitored private wells. To circumvent that difficulty, indirect exhaustive information including remote sensing data and the physical parameters of the aquifer have been used in a multi-linear regression framework. The resulting 3D model shows that the aquifer is over-exploited. It also shows that after 50 years of exploitation, the time needed to turn back to the natural situation would be about 150 years if the authorities would ban all exploitation now. Such an asymmetry in the time scales required to contaminate or remediate an aquifer is an important characteristic of coastal aquifers that must be taken into account in their management.
    Publication en relation: Hydrogeology Journal. - 2010/18/5/1173-1190
    Document hôte: Hydrogeology Journal
    Identifiant: 10.1007/s10040-010-0573-5 (DOI)

    • Article
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    Issues in characterizing heterogeneity and connectivity in non-multiGaussian media

    Kerrou, Jaouher
    Renard, Philippe, Hendricks Franssen, Harrie-Jan, Lunatic, Ivan
    Advances in Water Resources. - 2008/31/1/147-159
    2008
    Disponible
    Plus…
    Aucune localisation rattachée
    Titre: Issues in characterizing heterogeneity and connectivity in non-multiGaussian media
    Auteur: Kerrou, Jaouher
    Contributeur: Renard, Philippe; Hendricks Franssen, Harrie-Jan; Lunatic, Ivan
    Date: 2008
    Sujet: aquifer characterization - inverse - kriging - stochastic simulations - uncertainty - well-capture zones - connectivity - multiple-point statistics
    Description: The performances of kriging, stochastic simulations and sequential self-calibration inversion are assessed when characterizing a non-multiGaussian synthetic 2D braided channel aquifer. The comparison is based on a series of criteria such as the reproduction of the original reference transmissivity or head fields, but also in terms of accuracy of flow and transport (capture zone) forecasts when the flow conditions are modified. We observe that the errors remain large even for a dense data network. In addition some unexpected behaviours are observed when large transmissivity datasets are used. In particular, we observe an increase of the bias with the number of transmissivity data and an increasing uncertainty with the number of head data. This is interpreted as a consequence of the use of an inadequate multiGaussian stochastic model that is not able to reproduce the connectivity of the original field.The performances of kriging, stochastic simulations and sequential self-calibration inversion are assessed when characterizing a non-multiGaussian synthetic 2D braided channel aquifer. The comparison is based on a series of criteria such as the reproduction of the original reference transmissivity or head fields, but also in terms of accuracy of flow and transport (capture zone) forecasts when the flow conditions are modified. We observe that the errors remain large even for a dense data network. In addition some unexpected behaviours are observed when large transmissivity datasets are used. In particular, we observe an increase of the bias with the number of transmissivity data and an increasing uncertainty with the number of head data. This is interpreted as a consequence of the use of an inadequate multiGaussian stochastic model that is not able to reproduce the connectivity of the original field.
    Publication en relation: Advances in Water Resources. - 2008/31/1/147-159
    Document hôte: Advances in Water Resources
    Identifiant: 10.1016/j.advwatres.2007.07.002 (DOI)