Temporal Trend Calculation of DI (Drought Index) and comparison of two methods of IDW and KRG as important Spatial Analysis tools
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2014, Vol 4, Issue 7
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.
Authors and Affiliations
Maryam Rashidfar, Hassan Ahmadi, Gholamreza Zehtabian
Keywords
Related Articles
- EP ID EP37804
- DOI -
- Views 166
- Downloads 0
Modeling the diameter distribution of gymnosperm species from central karakoram national park, gilgit baltistan, and Pakistan using weibull function
This investigation focuses on modeling the tree diameter distribution using Weibull function of three gymnosperm species, i.e. Picea smithiana, Pinus wallichiana and Juniperus excelsa dominating the forests of Central...
Site suitability evaluation for ecotourism using MCDM methods and GIS: Case study- Lorestan province, Iran
On based environment, ecotourism led to preserve the environment and on based economic, ecotourism led to dynamical economic in local association by creating a labor and an income. On this base, recognize the sufficienc...
Biological properties of Eucalyptus L sps. extracts against microbial pathogens: An updated review
Plants allelopathic ingredients being non-hazardous and environmental friendly are uses as a natural substitute of pesticides. Keep in view this aspect of plants; present study aims to review published work of Eucalyptus...
Investigation of land use change detection using satellite imagery (case study in Behbahan Province hills in Iran)
Change detection using remote sensing data has been intentioned much expansive with researchers in recent years. This study aimed to investigate changes in the area of Zagros forests using satellite imagery using TM and...
An empirical assessment of value-chain analysis and competitive water quality assessment in ikot akpa nkuk community in ukanafun local government area of akwa ibom state, Nigeria
Ground and surface water samples were analyzed for physico-chemical parameters with recourse to water quality assessment in Ikot Akpa Nkuk Community and its environs, Ukanafon Local Government Area of Akwa Ibom State....