Analyzing Variation of Sediment Yields in Wet and Drought Years

Authors : İrfan OĞUZ

Pages : 146-156

Doi:10.1501/Tarimbil_0000001202

View : 21 | Download : 8

Publication Date : 2012-06-04

Article Type : Research Paper

Abstract :This study introduces meteorological and hydrologic drought effect on sediment yield in a small rural basin. Sediment yield was estimated by using Modified Universal Soil Loss Equation insert ignore into journalissuearticles values(MUSLE); model for 25 years period. The maximum and minimum sediment yields were estimated in 1980 and 1997 respectively. Historical precipitation and flow data were analyzed to determine meteorological and hydrological drought by Standardized Precipitation Index insert ignore into journalissuearticles values(SPI); method. In the study, meteorologically 10 years were drought and 15 years were wet while 14 years were drought and 11 years were wet hydrological. In the meteorologically drought and wet years, the sediment yield was estimated 6920.7 tons and 18068.2 tons respectively. In the hydrological dry and wet years, the sediment yield was estimated 7417.8 tons and 21489.2 tons respectively. It was indicated that, estimated sediment yields were found similar in meteorological and hydrological wet conditions. But sediment yields were found to be significantly higher in hydrological drought conditions than meteorological conditions. Drought reduced the sediment yield in the study area.
Keywords : MUSLE, GIS, drought, sediment yield, watershed, Turkey