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Research Paper | June 1, 2014

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Index of drought and wet years using the percentage of normal (PNPI) and Nietzsche Semnan

Sahar Ghafari, Rahim Rezaie, Esfandiar Jahantab

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J. Bio. Env. Sci.4(6), 124-130, June 2014

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Abstract

Hazards such as drought, which is affecting all aspects of life and the environment, so understanding the sources and across different environments, can be an important step in resource management. In this study the province’s rainfall, annual rainfall data for stations of Semnan, Shahrood, Damqan, Garmsar and Biarjmand, for calculation of wet and dry years were used for statistical analysis. There are different indicators for quantifying drought phenomenon. Indicators used in this study measures the Percent of Normal Precipitation Index (PNPI) and Nietzsche Index . The findings lead to the precipitation and the frequency of wet years and drought conditions in the stations was studied. The overall results indicate that in both Nietzsche and PNPI all stations during the study period with normal conditions have been met. However, the frequency of occurrence in normal years Nietzsche’s approach is far more of PNPI.

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Index of drought and wet years using the percentage of normal (PNPI) and Nietzsche Semnan

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