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Simulation of regional-scale groundwater flow in the Azul River basin, Buenos Aires Province, Argentina

Authors
  • Varni, Marcelo R.1
  • Usunoff, Eduardo J.1
  • 1 Instituto de Hidrología de Llanuras, CC 178, 7300 Azul, Argentina Fax: +51-2281-432666 e-mail: [email protected], AR
Type
Published Article
Journal
Hydrogeology Journal
Publisher
Springer-Verlag
Publication Date
Apr 01, 1999
Volume
7
Issue
2
Pages
180–187
Identifiers
DOI: 10.1007/s100400050190
Source
Springer Nature
Keywords
License
Yellow

Abstract

A three-dimensional modular model (MODFLOW) was used to simulate groundwater flow in the Azul River basin, Buenos Aires Province, Argentina, in order to assess the correctness of the conceptual model of the hydrogeological system. Simulated heads satisfactorily match observed heads in the regional water-table aquifer. Model results indicate that: (1) groundwater recharge is not uniform throughout the region but is best represented by three recharge rates, decreasing downgradient, similar to the distribution of soils and geomorphological characteristics; and (2) evapotranspiration rates are larger than previous estimates, which were made by using the Thornthwaite–Mather method. Evapotranspiration rates estimated by MODFLOW agree with results of independent studies of the region. Model results closely match historical surface-flow records, thereby suggesting that the model description of the aquifer–river relationship is correct.

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