ASPECTS OF DROUGHTS CHARACTERIZATION THE CRIȘURILOR PLAIN WITH STANDARDIZED PRECIPITATION INDEX (SPI) CALCULATED WITH THE HELP OF GAMMA AND LOG NORMAL FUNCTIONS
Journal Title: Natural Resources and Sustainable Development - Year 2016, Vol 6, Issue 1
Abstract
Present case study has as objectives analysis of the possibilities of agricultural drought monitoring from the center of Crișurilor Plain, using SPI values, calculatedwith Log normal and Gamma functions, highlighting the differences between the two types of values (SPI Log and SPI Gamma) and assessing conditions indicated for the use each tooth these functions with the help of correlations on the yields performed by the main crops in the area. The influence of the two probabilistic functions on the values of SPI was studied using an experimental device consisting of three durations of drought: long (12 months) medium (6 months) and short (1 month) and 3 different lengths of periods with recordings of precipitations from Oradea, Bihor: 66 (1946-2012), 44 (1968-2012) and 22 agricultural years (1990-2012). SPI Log normal and SPI Gamma values used to analyze agricultural droughts are different, Log normal function leading to lower values than those obtained with the Gamma function, in the negative values, exaggerates the intensity of droughts. SPI Log normal values may be used to analyze agricultural droughts from Crișurilor Plain, when the interval of records is short (22 years) and durations of droughts long (agricultural year) or medium (cold season and warm season) when the differences between SPI Log normal and SPI Gamma are acceptable.
Authors and Affiliations
Nicu Cornel Sabău, Radu Brejea
Keywords
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