NDLI: Water balance in the playa-lakes of an arid environment, Monegros, NE Spain

Content Provider	Springer Nature Link
Author	Castañeda, Carmen García Vera, Miguel Ángel
Copyright Year	2007
Abstract	The playa-lakes of the Monegros desert in north-east Spain are saline wetlands in an arid environment, a rare phenomenon in Europe. These extremely valuable habitats are threatened by changes associated with agricultural expansion and incorporation of new irrigated areas. An understanding of the present hydrologic regime will enable changes to be identified, particularly those brought about by flooding and pollution caused by irrigation surplus. This study sets out to show the results of applying a daily water balance in three selected playa-lakes. The balance was in two parts and consisted of: (1) the average balance for all the endorheic basin using the BALAN_11 program, and (2) the water balance in some playa-lakes, applying discharge flows obtained from the previous balance. The resulting volumes of water were converted to water depths and contrasted with reference volumes taken from field and Landsat images. The model was calibrated by applying various hypotheses of function which enabled the results to be adjusted. The proposed balance is an acceptable reproduction of field water measurements during this period, and underlines the consistency of the conceptual model. The methodology used is appropriate for understanding the playa-lakes function and for monitoring them for conservation purposes.Les playa-lakes (saladas) du désert de Monegros, situé au nord-est de l’Espagne, sont des zones humides salines en environnement aride, phénomène rare en Europe. Ces habitats inestimables sont menacés par les changements associés à l’expansion agricole et à la création de nouvelles zones irriguées. Une meilleure compréhension du régime hydrologique actuel permettra d’identifier ces changements, notamment ceux générés par les inondations et la pollution causés par le surplus d’irrigation. La présente étude expose les résultats de l’application de bilans en eau quotidiens sur trois playa-lakes sélectionnés. Les bilans étaient scindés en deux parties : (1) le bilan moyen sur l’ensemble du bassin endoréique, utilisant le programme BALAN_11, et (2) le bilan en eau dans quelques lacs asséchés, appliquant les débits de sortie obtenus par le bilan précédent. Les volumes d’eau obtenus ont été convertis en hauteurs d’eau, et mis en contraste avec les volumes de référence issus des observations sur site et des images Landsat. Plusieurs hypothèses ont été mises en œuvre pour calibrer le modèle, en ajustant au mieux les résultats. Le bilan proposé constitue une image satisfaisante des mesures de terrain sur la période considérée, et souligne la cohérence du modèle conceptuel. La méthodologie mise en œuvre est adéquate pour comprendre la fonction des playa-lakes, et pour les surveiller en vue de leur préservation.Los playa-lakes (saladas) del desierto Monegros en el nororiente de España son humedales salinos en un ambiente árido, un fenómeno raro en Europa. Estos hábitats extremadamente valiosos están amenazados por cambios asociados con expansión agrícola e incorporación de nuevas áreas de riego. Un entendimiento del ámbito hidrológico actual permitirá identificar cambios, especialmente los cambios ocasionados por inundación y contaminación ocasionados por exceso de riego. Este estudio se propone mostrar los resultados de aplicar un balance hídrico diario en tres playa-lakes seleccionados. El balance se hizo en dos partes y consistió de: (1) el balance promedio para todas las cuencas endorreicas usando el programa BALAN_11, y (2) el balance hídrico en algunos lagos de playa, aplicando flujos de descarga obtenidos en base al balance anterior. Los volúmenes resultantes de agua se convirtieron a profundidades de agua y se contrastaron con volúmenes de referencia tomados del campo y de imágenes Landsat. El modelo se calibró mediante la aplicación de varias hipótesis de función lo cual permitió que se ajustaran los resultados. El balance propuesto es una reproducción aceptable de mediciones de agua en el campo durante este periodo y remarca la consistencia del modelo conceptual. La metodología utilizada es apropiada para el entendimiento de la función de los playa-lakes y para su seguimiento con propósitos de conservación.
Starting Page	87
Ending Page	102
Page Count	16
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	1
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-11-17
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arid regions Groundwater recharge/water budget Wetlands Monegros desert Spain 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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