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Paper Information

Title: 

MAPPING OF SEVERE DROUGHT IN FARS PROVINCE USING STANDARDIZED PRECIPITATION INDEX (SPI) IN GEOGRAPHIC INFORMATION SYSTEMS (GIS)

Type: PAPER
Author(s): PIRMORADIAN NADER,SHAMSNIA SEYED AMIR
 
 
 
Name of Seminar: HAMAYESHE MANTAGHEI KARBORD FANAVARIHAYE NOVIN DAR KESHAVARZI
Type of Seminar:  CONGRESS
Sponsor:  Islamic Azad University, Shiraz
Date:  2008Volume 1
 
 
Abstract: 

DROUGHT IS AN INSEPARABLE PART OF THE CLIMATE CHANGES WHICH MAY OCCUR IN ANY AREA AND HAS MAJOR EFFECTS. THE DESCRIPTIVE ANALYSES OF DROUGHT ARE USUALLY PRESENTED. IN THIS RESPECT CHANGING THE QUALITATIVE AND DESCRIPTIVE, MANNER OF THIS PHENOMENON INTO QUANTITATIVE AND NUMERICAL IS USED. IN THE PRESENT STUDY, THE STANDARDIZED PRECIPITATION INDEX (SPI) WAS USED TO ANALYZE THE FARS PROVINCE DROUGHT DUE TO ITS ADVANTAGES IN MONITORING THE CONDITION IN ASSOCIATION WITH CLIMATE, HYDROLOGIC AND AGRICULTURAL ASPECTS. THE SUM OF 125 STATIONS IN FARS PROVINCE AND NEIGHBORING PROVINCES WERE SELECTED REGARDING AVAILABLE LONG TERM STATISTICS, LOW STATISTICAL EFFICIENCIES AND DESIRABLE PREVALENCE WITH SHARED 30 YEARS STATISTICAL PERIOD (1972-1973 TO 2001-2002). SPI INDEX WAS CALCULATED CONSIDERING 6, 12 AND 24 MONTH TIME SCALE FOR APPOINTED STATIONS IN THIS STUDY. TO MAPPING OF SEVERE DROUGHTS GEOGRAPHIC INFORMATION SYSTEM WAS USED. IN THIS RESPECT, KRIGING MODEL WAS SELECTED AFTER EVALUATION OF INVERSE DISTANCE WEIGHTED (IDW), SPLINE AND KRIGING. DIFFERENT TESTS WERE CARRIED OUT USING KRIGING METHOD AND GEOSTATISTICS FOR THE ENVIRONMENTAL SCIENCES (GS+) SOFTWARE BASED ON THE EQUATIONS RELATED TO SEMI VARIOGRAM MODELS TO SELECT THE BEST MODEL WITH REGARD TO THE LOWEST VARIANCE ERROR AND THE BEST EFFECT DOMAIN. FINALLY, THE MAP OF DROUGHT MAPPING IN DIFFERENT TIME SCALES IN GIS WAS PROVIDED USING THE SEMI VARIOGRAM OF OPTIMUM VIEW IN KRIGING. THE RESULT OF STUDY REVEALS THE MANNER OF TIME FACTOR EFFECT AMONG TYPES DROUGHT, AS THE PROLONG OF DROUGHT DURATION AND ITS CONTINUATION, THE TWO VARIABLES OF SEVERITY AND LOCAL DOMAIN OF DROUGHT INCREASE. THE OTHER RESULTS OF THE STUDY DETERMINE THE RISKS OF DROUGHT IN VARIOUS POINTS OF FARS PROVINCE AND DIFFERENT PROVIDING AND CONSUMPTIVE WATER RESOURCES AS WELL. ALSO, THE PROCESS OF DIFFERENT SEVERE DROUGHT WAS DETERMINED IN FARS PROVINCE.

 
Keyword(s): DROUGHT, STANDARDIZED PRECIPITATION INDEX, GEOGRAPHIC INFORMATION SYSTEMS, FARS PROVINCE
 
 
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