Meteorological and hydrological drought monitoring using several drought indices

Abstract With respect to the necessity of comprehensive studies on drought and also high damages that caused by drought, this research studied meteorological hydrological droughts. In study, Lighvan, Navroud Seqez basins with different climates were selected. We used monthly data stream flow, precipitation evaporation from 1992 2016 for study phenomena. The aim at is analyze SPI SPEI determination dry wet periods use SSI exploration drought. analysis characteristics such as intensity duration in three areas shows climate change has a major impact relations between severity have been more accurate period 9 months watershed basin. most significant events are SPI-9 57 34.7, SPEI-9 34 28.09 SSI-9 41 30.2. According obtained equations time periods, it was resulted highest accuracy observed relationship basin 6 months. results show all basins, correlation level 99%. Results droughts Lighvan 48-month 12- 24-month using nonlinear linear models (polynomial, exponential logarithmic). good R 2 0.8 0.92, respectively, polynomial equations. maximum coefficient 0.72 0.82, equation. application several indices indicating components cycle integrates many factors affect trigger droughts, thus can help providing wider realization various water sections.