A Regional Model of the Hydrological Drought Severity for TEHRAN Province

摘要

Prolonged streamflow droughts can imply high economic or even human loss where rivers act as water supply systems or as inflows to hydropower, and fauna habits can be damaged, especially in areas where rivers are used as sewage recipients. The primary purpose of this study is to develop regional models of the hydrological drought severity at ungaged sites in Tehran province. Because of the close relationship between drought severity and hydrogeological features, The model development first involved delimiting homogeneous hydrological regions by using two -step cluster analysis. A model of completely describing and analyzing the stochastic process of stream drought has been recommended. A run analysis of drought seventies with the different return periods of 12 stations in Tehran province in Iran was estimated from watershed and climatic parameters. The study results reveals that the regional regression models developed in this study could be applied reasonably at ungaged sites.