Hydro-Climatological Drought Analyses and Projections Using Meteorological and Hydrological Drought Indices: A Case Study in the Blue River Basin, Oklahoma

Three drought indices, the Standardized Precipitation Index (SPI), Palmer Drought Severity Index (PDSI), and Standardized Runoff Index (SRI) were modeled under global climate change scenarios for a drought-prone river basin in Oklahoma. Results showed that more severe droughts of wider extent are very likely to occur, especially in the later part of the 21st century.