NDLI: A conceptual and numerical model for groundwater management: a case study on a coastal aquifer in southern Tuscany, Italy

Content Provider	Springer Nature Link
Author	Barazzuoli, Piero cchi, Monica Rigati, Roberto Salleolini, Massimo
Copyright Year	2008
Abstract	Ongoing hydrogeological research aims to develop a correct management model for the Plio-Pleistocene multi-aquifer system of the Albegna River coastal plain (southern Tuscany, Italy); overexploitation of this aquifer for irrigation and tourism has caused seawater intrusion. The conceptual model is based on field and laboratory data collected during the 1995–2003 period. Meteoric infiltration and flows from the adjoining carbonate aquifer recharge the aquifer. Natural outflow occurs through a diffuse flow into the sea and river; artificial outflow occurs through intensive extraction of groundwater from wells. Water exchanges in the aquifer occur naturally (leakage, closing of aquitard) and artificially (multiscreened wells). The aquifer was represented by a three-dimensional finite element model using the FEFLOW numerical code. The model was calibrated for steady-state and transient conditions by matching computed and measured piezometric levels (February 1995–February 1996). The model helped establish that seawater intrusion is essentially due to withdrawals near the coast during the irrigation season and that it occurs above all in the Osa-Albegna sector, as well as along the river that at times feeds the aquifer. The effects of hypothetical aquifer exploitation were assessed in terms of water budget and hydraulic head evolution.Une étude hydrogéologique en cours a pour but de développer un modèle approprié de gestion pour le système aquifère multiple du Plio-Pléistocène de la plaine côtière de l’Albegna River (Toscane méridionale, Italie); la surexploitation de cet aquifère pour l’irrigation et le tourisme a entraîné l’intrusion d’eau de mer. Le modèle conceptuel est basé sur des données de terrain et de laboratoire collectées pendant la période 1995–2003. L’infiltration météorique et les écoulements de l’aquifère carbonaté contigu rechargent l’aquifère. L’écoulement naturel résulte d’un écoulement diffus dans la mer et la rivière, l’écoulement artificiel résulte d’une extraction intensive d’eau souterraine par des puits. Les échanges d’eau dans l’aquifère se produisent naturellement (drainance, fermeture d’aquitard) et artificiellement (puits à crépines multiples). L’aquifère a été représenté par un modèle 3D à éléments finis utilisant le code numérique FEFLOW. Le modèle a été calibré pour des conditions permanentes et transitoires en comparant les niveaux piézométriques calculés et mesurés (Février 1995–Février 1996). Le modèle a permis d’établir que l’intrusion d’eau de mer est due essentiellement aux prélèvements près de la côte pendant la saison d’irrigation et qu’elle se manifeste surtout dans le secteur Osa-Albegna, de même que le long de la rivière qui alimente parfois l’aquifère. Les effets d’une exploitation hypothétique de l’aquifère ont été évalués en terme de budget d’eau et d’évolution de la piézométrie.Las investigaciones hidrogeológicas en marcha tienen por objetivo el desarrollo de un modelo de gestión apropiado del sistema acuífero múltiple Plio-Pleistoceno de la planicie costera del Río Albegna (sur de Toscana, Italia), donde la sobre-explotación del acuífero para riego y turismo ha causado intrusión marina. El modelo conceptual se sustenta en datos de campo y de laboratorio compilados en el período 1995–2003. La recarga del acuífero se produce por infiltración de agua de lluvia y aportes del acuífero carbonático contiguo. La descarga natural ocurre en la forma de flujo difuso hacia el mao y el río, en tanto que la descarga artificial se produce por bombeo intensivo de aguas subterráneas. Los intercambios de agua en el acuífero tienen lugar por efectos naturales (drenaje, cierre de acuitardos), y artificiales (pozos con rejillas filtrantes múltiples). El acuífero se representó con un modelo tridimensional de elementos finitos usando el código numérico FEFLOW. El modelo se calibró para condiciones estacionarias y transitorias mediante la comparación de niveles piezométricos calculados y medidos (Febrero 1995–Febrero 1996). El modelo sirvió para demostrar que la intrusión marina se debe a extracciones de agua subterránea cerca de la costa durante la época de riego, y que ocurre principalmente en el sector de Osa-Albegna y a lo largo del río que en ciertos períodos recarga el acuífero. El efecto de la hipotética explotación del acuífero se evaluó por medio del balance de agua y la evolución de los niveles del agua subterránea.由于灌溉及旅游业的发展, 意大利托斯卡纳南部上新世/更新世含水层组过量开采, 已经引起了海水入侵。进行中的水文地质研究的目的是建立该含水层组的优化管理模型。概念模型以1995至2003年间的野外和实验室数据为依据。该含水层靠降雨入渗以及相邻的碳酸盐含水层补给, 以扩散流的形式天然排泄入海洋和河流, 或通过井孔的大流量抽水人工排泄。含水层间存在天然 (越流、半透水层天窗) 或人工 (多层取水的井孔) 水量交换。本文采用FEFLOW数值模拟软件建立了含水层的三维有限元模型, 并采用1995年2月至1996年2月的观测数据对模型进行了稳态和非稳态条件下的拟合。模拟结果表明, 海水入侵基本上是由海岸带抽水灌溉引起的, 首先发生于Osa-Albegna地区以及补给地下水的河流沿岸。依据水均衡原则和水位变化情况, 评价了不同的地下水开发模式的效果。A investigação hidrogeológica em curso pretende desenvolver um modelo correcto de gestão para o sistema multi-aquífero Plio-Plistocénico da planície costeira do Rio Albegna (sul de Toscana, Itália); a sobreexploração deste aquífero para efeitos de rega e turismo tem provocado intrusão salina. O modelo conceptual baseia-se em dados de campo e laboratoriais recolhidos durante o período de 1995–2003. A recarga do aquífero provém da infiltração de águas meteóricas e das entradas laterais do aquífero carbonatado adjacente. Descargas naturais ocorrem por escoamento difuso para o mar e para o rio, enquanto a exploração intensiva de águas subterrâneas constitui uma descarga artificial. Trocas de água no aquífero ocorrem naturalmente (perdas, ausência do aquitardo) e por via artificial (furos com filtros múltiplos). O aquífero foi representado por um modelo 3D de elementos finitos, usando o código numérico FEFLOW. O modelo foi calibrado para as condições de regime permanente e transitório, comparando níveis piezométricos calculados com valores observados (Fevereiro 1995–Fevereiro 1996). O modelo serviu para confirmar que a intrusão salina é provocada essencialmente pelas extracções de água junto à linha costeira durante a época de rega, e que ocorre principalmente no sector de Osa-Albegna, bem como ao longo do rio que em certas alturas alimenta o aquífero. Os efeitos de cenários hipotéticos de exploração do aquífero foram avaliados em termos do balanço hídrico e da evolução dos potenciais hidráulicos.
Starting Page	1557
Ending Page	1576
Page Count	20
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	8
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2008-07-01
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater modeling Coastal aquifer Salinization Water budget Italy 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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