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Pakistan Journal of Biological Sciences
Year: 2008  |  Volume: 11  |  Issue: 5  |  Page No.: 702 - 710

The Scaling Technique in Palmer Drought Severity Index; Generalized Calibration and Modification

Ali Reza Soltani Tudeshki, Sefollah Amin Sichani, Saied Mohammad Jafar Nazemossadat, Mohammad Karamouz and Soheila Javanmard    

Abstract: The scaling technique in calculating Palmer Drought Severity Index (PDSI) has specific properties, which is considered in details, in this study. The Palmer scaling method contains a physically-based weighting factor called climatic characteristic coefficient, K. This factor, is the ratio of average moisture demand to average supply in a regional water balance, whose related coefficients and involved equation parameters should be calibrated according to any special case study. Therefore, in this study, the generalizing procedure of obtaining K-value with no dependency on particular area, in addition to some modifications in the process was analytically developed. The generalized procedure has an appropriate potential for various purposes such as; correctly identifying analytical K-formula, simplifying its application, recognizing its limitations and moreover it can be used in other researches for developing its advantages. The proposed procedure and its modifications also applied for a case study (e.g., Maharlue catchment, Fars province, Iran). The outputs of the application validated the suggested modifications; therefore, the obtained K-values can be used for other studies in the region.

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