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

ALBERTO DANIEL CAPRIOLO ; OLGA EUGENIA SCARPATI

ISRN Meteorology

HINDAWI

Lugar: New York, NY 10022; Año: 2012 vol. 2012 p. 1 - 9

2090 7516

This paper studies the soil water deficit and soil water surplus from 1971 to 2010 in three drainage areas of Buenos Aires province resulting from soil water balance using soil data obtained ?in situ?. It was performed using the evapotranspitation 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. An annual threshold value of 200 mm of soil water deficit and 300 mm of soil water surplus were considered as triggers of drought and flood respectively. There were applied two classifications for the intensity of the extreme hydrologic events as mild, moderate, severe and extreme according the annual values reached by the components of soil water balance. Mann Kendall statistical test was performed and significance trends at levels 0.1 were found for drought and for two periods, one of twenty years (1991- 2010) and another for ten years (2001 ? 2010). As sample of the temporal evolution of both components and their trends, the results of the station (Junin) were deeply analyzed.