Table of Contents
ISRN Meteorology
Volume 2012 (2012), Article ID 415081, 9 pages
http://dx.doi.org/10.5402/2012/415081
Research Article

Extreme Hydrologic Events in North Area of Buenos Aires Province (Argentina)

1National Research Council (CONICET), Buenos Aires Paraguay 2155, Ciudad Autonoma de Buenos Aires, C1121ABG Buenos Aires, Argentina
2Geography Department, La Plata National University, Calle 48 entre 6 y 7, 1900 La Plata, Argentina

Received 28 September 2012; Accepted 16 October 2012

Academic Editors: L.-T. Hsieh, N. A. Mazzeo, and F. Tao

Copyright © 2012 Alberto Daniel Capriolo and Olga Eugenia Scarpati. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents the soil water deficit and soil water surplus obtained from soil water balance in three drainage areas of Buenos Aires province for the period from 1971 to 2010. The soil water balance had been performed using the evapotranspiration formula of Penman-Monteith and considering the soil water constants: field capacity, soil water moisture, and soil wilting point for all the different types of soils of the region. The obtained soil water deficit and surplus are considered as triggers of extreme hydrologic events. Annual threshold values of 200 mm of soil water deficit and 300 mm of soil water surplus were considered for drought and flood, respectively. It was found that almost the 25% of the floods are severe and extreme while the 50% of droughts were of these intensities. Mann-Kendall statistical test was performed, and significance trends at level 0.1 were found for drought and for two periods, one of twenty years (1991–2010) and the other of ten years (2001–2010). As a sample of the temporal evolution of both events and their trends, the results of one locality (Junin) were deeply analyzed.