Temporal trend calculation of di (drought index) and comparison of two methods of IDW and KRG as important spatial analysis tools
Paper Details
Temporal trend calculation of di (drought index) and comparison of two methods of IDW and KRG as important spatial analysis tools
Abstract
Drought is one of the main natural causes of agricultural, economic and environmental damage. The objective of this study is to provide a comparative spatial analysis by using IDW and KRG methods in Taleghan Watershed in Iran with the view to identifying trends and onset of drought. Data-set is collected from 8 climatology station within the watershed from 1967 to 2008. After testing and if needed normalizing the data, they transformed to the DIP software for calculating the DI. In the second stage we used data in GS+ for assessing the spatial variability of DI Geostatic calculations. To increase certainty, we used cross validation and t-student test to make better decision in choosing best manner for mapping. As results of test, KRG had the highest accuracy compared to the others in making spatial maps. The lack of rain and abnormally dry weather that has happened in 1976 and 1988 was the same and the watershed has been exposed only in extremely dry condition. In addition, for wet period we observed a reverse condition i.e. the area and severity of wet in 2005 is weaker than 1994. In the map of 1994 we can see the extremely wet class in all parts of the watershed, while in the second peak year of wet period, there are moderate, severe and extreme conditions. We can indicate that KRG method for mapping the spatial distribution of climate condition by using the DI can end in a better map than that of IDW method.
Bhuiyan C, Kogan, F N. 2008. Monsoon dynamics and vegetative drought patterns in the Luni basin under rain-shadow zone. Int. Journal of Remote Sensing 31(12), 181-188.
Burton I. Kates R, White G. 1978. The Environment as Hazard. New York, Oxford University, 240pp.
Coughlan MJ. 1987. Monitoring drought in Australia. In Planning for drought: Toward a reduction of societal. Vestview Press, Australia, 11– 27.
Gibbs WJ, Maher JV. 1967. Rainfall deciles as drought indicators. Bulletin of Bureau of Meteorology, Melburne, Australia, No. 48.
Hennessy KR, Fawcett D, Kirono F, Mpelasoka D, Jones J, Bathols P, Whetton M, Stafford Smith M, Howden C. 2008. An assessment of the impact of climate change on the nature and frequency of exceptional climatic events. Available from http://www.appslabs.com.au/salinity.htm.
Kim TW, Valdes JB, Aparicio J. 2002. Frequency and spatial chracteristics of droughts in the Conchos river basin, Mexico. Water International Journal 27(3), 420–430.
Keyantash J, Dracup JA. 2002. The quantification of drought: An evaluation of drought indices. Bull. Amer. Meteor. Soc. 83, 1167–1180.
McMahon TA. 1986. River and Reservoir Yield. Water Resources Publications. Commonwealth of Australia, 56 pp.
Mihaela M, I Mares, C Mares. 2009. Climate Variability of Drought Indices in Romania. Rev. Roum. Geophysiqe, 67–76.
Smakhtin, DA Hughes. 2004. Review, automated estimation and analyses of drought indices in South Asia. International Water Management Institute, 83 pp.
Stahl K. 2001. Hydrological drought a study across Europe. Albert-Ludwigs Universität Freiburg. Freiburg, p. 129.
Wilhite DA, MH Glantz. 1985. Understanding the Drought Phenomenon: The Role of Definitions. Water International Journal 10(3), 111–120.
Wilhite DA. 1993. Drought Assessment, Management and Planning. Theory and Case Studies. Natural Resource Management and Policy Series. Kluwer Publication, 293pp.
Vander S, G Briffa, KR, Jones, PD Osborne. 2006. Summer moisture variability across Europe. Journal of Climate 19, 2818–2834.
Zhao M, Running. 2010. Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009. Science Journal 329, 940-943.
Maryam Rashidfar, Hassan Ahmadi, Gholamreza Zehtabian (2014), Temporal trend calculation of di (drought index) and comparison of two methods of IDW and KRG as important spatial analysis tools; JBES, V5, N1, July, P385-395
https://innspub.net/temporal-trend-calculation-of-di-drought-index-and-comparison-of-two-methods-of-idw-and-krg-as-important-spatial-analysis-tools/
Copyright © 2014
By Authors and International
Network for Natural Sciences
(INNSPUB) https://innspub.net
This article is published under the terms of the
Creative Commons Attribution License 4.0