NDLI: Modeling the impact of groundwater harvesting on the hydro-salinity of a saline catchment in southeastern Australia

Content Provider	Springer Nature Link
Author	Khan, Shahbaz Asghar, Muhammad Nadeem Rana, Tariq
Copyright Year	2007
Abstract	Recharge to a saline, unconfined shallow-water-table aquifer is normally considered as an irrecoverable loss of water, but such thinking could be reviewed empirically. The use of an appropriate groundwater harvesting system does not only provide an opportunity to recover this lost water, but can also help in catchment salinity management and improvement. Agricultural-based land-drainage systems such as those that use serial biological concentration (SBC) of salts, provide examples of such harvesting methods. The impact of groundwater harvesting has been assessed on the hydro-salinity of a saline catchment in southeastern Australia through modeling. For both the below average rainfall and very wet years, the “do nothing” scenario resulted in increasing salinization in the catchment. However, after introducing a SBC system, groundwater salinity showed a decreasing trend while hydraulic heads tended to stabilize around the depth of subsurface collector wells. However, for a successful groundwater harvesting system, proper understanding of the groundwater flows and salt mobilization associated with a catchment is necessary. The outcomes of this modelling study have the potential to address similar issues (salinization) and/or needs (water harvesting) existing elsewhere in the world, particularly in semi-arid regions.La recharge d’un aquifère salin phréatique libre est habituellement vue comme une perte irrémédiable d’eau, cependant, une telle approche pourrait être réexaminée empiriquement. L’utilisation d’un système adapté de collecte de l’eau souterraine ne permet pas seulement de récupérer cette eau perdue, mais peut également aider à améliorer la gestion de la salinité du bassin versant. Les systèmes agricoles de drainage des sols, comme ceux qui utilisent la concentration biologique en série des sels (SBC en anglais), sont des exemples de méthodes de collecte. L’impact de la collecte de l’eau souterraine a été évaluée, grâce à la modélisation, pour l’hydro-salinité d’un bassin salin dans le sud-est de l’Australie. Le scénario « consistant à ne rien faire » a conduit à une augmentation de la salinité dans le bassin versant, aussi bien pour des années très humides que pour des années avec des précipitations inférieures à la moyenne. Cependant, après l’introduction d’un système SBC, une tendance décroissante de la salinité de l’eau souterraine a été observée alors que les niveaux piézomètriques se stabilisaient environ au niveau de la profondeur des collecteurs. Néanmoins, pour que le système de collecte de l’eau souterraine soit efficace, il est nécessaire de bien connaître les processus d’écoulements de l’eau souterraine et de mobilisation des sels associés à un bassin versant. Les résultats de cette étude de modélisation peuvent s’appliquer à des problèmes (salinisation) et/ou des besoins (collecte d’eau) similaires partout dans le monde et en particulier dans les régions semi-arides.La recarga de un acuífero libre salinizado con niveles poco profundos se considera normalmente como una pérdida irrecuperable de agua, pero esta idea puede ser revisada empíricamente. La utilización de un sistema adecuado para la recogida de estas aguas subterráneas no solamente constituye una oportunidad para recuperar este agua perdida, sino que también puede ayudar en el manejo de la salinidad y su mejora. Los sistemas de drenaje de los suelos agrícolas, como los que usan progresivas concentraciones biológicas de sales dan ejemplos de estos métodos de toma. Se ha valorado mediante modelización el impacto de la recogida de agua subterránea en la salinidad del agua de una cuenca salina en el sureste de Australia. Para años con lluvias por debajo de la media y años muy húmedos, el escenario de “no hacer nada” dio lugar a un incremento de la salinización en la cuenca. Sin embargo, después de introducir un sistema SBC, la salinidad del agua subterránea mostró una tendencia descendente mientras que los niveles tendieron a estabilizarse alrededor de la profundidad de la superficie de los pozos colectores. Sin embargo, para un sistema de recogida de aguas subterráneas eficiente, es necesario conocer de forma apropiada el sistema de flujo de las aguas subterráneas y la movilización de las sales asociadas en la cuenca. Las consecuencias de este estudio de modelización tienen el potencial para abordar temas similares (salinización) y/o necesidades (recogida de agua) existentes en cualquier parte del mundo, especialmente en regiones semiáridas.
Starting Page	713
Ending Page	726
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-09
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater harvesting Groundwater recharge/water budget Salinization Catchment management Australia 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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