NDLI: Impact of peatland drainage and restoration on esker groundwater resources: modeling future scenarios for management

Content Provider	Springer Nature Link
Author	Rossi, Pekka M. Ala aho, Pertti Doherty, John Kløve, Bjørn
Copyright Year	2014
Abstract	Esker aquifers are common groundwater bodies in Europe. Management of these aquifers should take account of the sustainability of groundwater-dependent ecosystems and land use in an integrated way. An unconfined esker aquifer in northern Finland was modelled with MODFLOW to determine how groundwater resources are impacted by the surrounding peatland drainage scheme and to simulate scenarios for possible drainage restoration. The impacts of groundwater abstraction and climate change were also simulated. A calibration-constrained Monte Carlo method was used to provide information on the uncertainties associated with model predictions. The results suggest that peatland drainage in the vicinity of eskers can have a significant role in lowering the water table, even though climate variability may mask these impacts. Drainage restoration by filling the ditches might have positive impacts on the aquifer water levels. Comparison of water-table changes caused by peatland drainage with the changes brought by water abstraction and climate variability helped to quantify impacts of different land-use scenarios and facilitated discussion with the local stakeholders. Based on this study, more attention should be devoted to peatland drainage schemes in integrated groundwater management of esker aquifers.Les aquifères au sein des eskers sont des masses d’eau souterraine communes en Europe. La gestion de ces aquifères doit tenir compte de la durabilité des écosystèmes tributaires des eaux souterraines et de l’utilisation des terres de manière intégrée. Un aquifère libre au sein d’esker dans le nord de la Finlande a été modélisé avec MODFLOW afin de déterminer comme les ressources en eau souterraine sont impactées par les modalités de drainage des tourbières environnantes et pour simuler des scénarios de restauration possible de drainage. Les impacts de prélèvement des eaux souterraines et du changement climatique ont également été simulés. La méthode de calibration Monte Carlo a été utilisée pour fournir une information sur les incertitudes associées aux prévisions du modèle. Les résultats suggèrent que le drainage des tourbières dans le voisinage des eskers peut avoir un rôle significatif sur l’abaissement du niveau phréatique, même si la variabilité climatique peut masquer ces impacts. La restauration du drainage en comblant des fossés peut avoir des impacts positifs sur les niveaux piézométriques de l’aquifère. La comparaison des modifications des niveaux piézométriques causés par le drainage des tourbières avec les modifications induites par les prélèvements en eau souterraine et la variabilité climatique a aidé à quantifier les impacts des différents scénarios d’utilisation des terres et a facilité la discussion avec les parties prenantes locales. A partir de cette étude, plus d’attention devrait être accordée aux modalités de drainage des tourbières dans la gestion intégrée des eaux souterraines des aquifères d’esker.Los acuíferos en esker son cuerpos comunes de agua subterránea en Europa. El manejo de estos acuíferos debe tener en cuenta la sostenibilidad de los ecosistemas que dependen del agua subterránea y del uso de la tierra de una forma integrada. Se modeló un acuífero esker no confinado en el norte de Finlandia con MODFLOW para determinar como los recursos de agua subterránea son impactados el esquema de drenaje de una turbera circundante y para simular escenarios para una posible restauración del drenaje. También se simularon los impactos de la extracción de agua subterránea y del cambio climático. Se utilizó el método Monte Carlo restringido por el calibrado para proveer información sobre las incertidumbres asociadas con las predicciones del modelo. Los resultados sugieren que el drenaje de turberas en la vecindad de los eskers puede tener un rol significativo en el descenso del nivel freático, aun cuando la variabilidad climática pueda enmascarar estos impactos. La restauración del drenaje mediante el relleno de las zanjas podría tener impactos positivos sobre los niveles de agua del acuífero. La comparación de los cambios en el nivel freático causado por el drenaje de las turberas con los cambios acarreados por la extracción del agua y la variabilidad del clima ayudaron para cuantificar los impactos de diferentes escenarios de uso de la tierra y facilitaron la discusión con los actores locales. Basado en este estudio, se debe dedicar más atención a los esquemas de drenaje de las turberas en un manejo integrado del agua subterránea de los acuíferos eskers.蛇形丘含水层是欧洲常见的地下水体。这些含水层的管理应该综合考虑依赖地下水的生态系统的可持续性和土地利用。采用MODFLOW模拟了芬兰北部一个非承压蛇形丘含水层,以确定地下水资源是怎样受到周围泥炭地排水方案影响的,并模拟了可能排水恢复的各种方案。同时还模拟了地下水抽取和气候变化的影响。采用校准约束的蒙特卡洛法提供了与模型预测相关的不确定性方面的信息。结果表明,蛇形丘附近的泥炭地排水在降低水位中具有重要作用,尽管气候变异可能掩饰着这些影响。通过填充壕沟使排水恢复可能对含水层水位有积极影响。泥炭地排水造成的水位变化与抽水及气候变异导致的变化对比有助于定量不同土地利用方案的影响,促进与当地利益相关人之间的探讨。在本研究的基础上,应该更加注重蛇形丘含水层综合管理中的泥炭地排水。Os aquíferos esker são massas de água subterrânea comuns na Europa. A gestão destes aquíferos deve ter em conta, de forma integrada, a sustentabilidade dos ecossistemas dependentes de água subterrânea e o uso do solo. Um aquífero esker não confinado no norte da Finlândia foi modelado com o MODFLOW para determinar como os recursos hídricos subterrâneos são afetados na envolvência de um sistema de drenagem de turfeiras e para simular cenários para uma possível restauração da drenagem. Os impactes da captação de águas subterrâneas e de alterações climáticas também foram simulados. O método de Monte Carlo com restrições de calibração foi utilizado para fornecer informações sobre as incertezas associadas às previsões do modelo. Os resultados sugerem que a drenagem das turfeiras na vizinhança de eskers pode ter um papel significativo no rebaixamento do nível freático, apesar da variabilidade climática poder encobrir esses impactes. A restauração da drenagem através do preenchimento das valas pode ter impactes positivos sobre os níveis da água no aquífero. A comparação das variações do nível freático causadas por drenagem de turfeiras com as variações resultantes da captação de água e da variabilidade climática ajudou a quantificar os impactes de diferentes cenários de uso do solo e facilitou a discussão com os atores locais interessados. Com base neste estudo, conclui-se que se deve dedicar mais atenção aos sistemas de drenagem de turfeiras na gestão integrada das águas subterrâneas em aquíferos esker.
Starting Page	1131
Ending Page	1145
Page Count	15
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	2014-03-19
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater management Numerical modeling Wetlands Uncertainty analysis Finland 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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