رفتار‌شناسی شاخص‌های خشک‌سالی و هیدرولوژیک در حوضه آفرینه

Drought is one of the natural phenomena and is considered as one of the most important challenges of agriculture and natural resources sector in Iran. which has many harmful economic and social effects. The purpose of this research is to investigate and analyze the effects of meteorological drought on the surface waters in Afarine sub catchment of Kashkan basin located in Lorestan province. In this research, the common period (1361-1396) was considered for the corresponding hydrometric and rain gauge stations. Then, the standardized precipitation index and the standardized discharge index were calculated and analyzed using the correlation method. The results showed that, the delayed effect of meteorological drought on the surface flow of the river can be traced from six to eighteen months, which should be considered in the water resources planning of the region. The correlation between SPI and the SDI is 0.459 at the six months’ time steps. In the period of nine to twelve months, this relationship improves slightly and reaches 0.538. In summary, the delay effect interval between meteorological and hydrological drought was between six and eighteen months.