ESTIMATION OF SOIL EROSION AND RIVER SEDIMENT YIELD IN A RURAL BASIN OF NORTH ANATOLIA, TURKEY
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The aim of the study was to evaluate the sediment prediction performance of Revised Universal Equation (RUSLE) and Musgrave Equation at the Ekinli pond catchment, North central part of Turkey. Ekinli pond was built in 1977 for irrigation purposes. The accumulation of sediment in the ponds negatively affects their functions. There are many dams located within the study area whose operations have been adversely affected by excessive reservoir sedimentation. Accurate estimation of sediment deposition is important in the design of a pond. The calculated amount of sediment volume deposited in the Ekinli reservoir was 21600.75 m(3) and the average sediment yield was 514.3 m(3) y(-1) between 1977 and 2018. In the Ekinli basin, the availability of bathymetry measurements between 1981 and 2006, provided the appropriate conditions to validate the results of the predicted sediment yield since the deposited sediment volume could be quantified as 552.3 m(3)y(-1). The measured and estimated sediment amounts for the Ekinli reservoir have shown an excellent accordance. In the 42-year time period, 6.74% of the water storage capacity of the pond has been lost. From 1977 to 2000, the entire basin was grassland and 38% of the basin area has been afforested. The landuse change reduced a little the amount of sediment in the reservoir. The Mann-Kendal and Theil-Sen Slope estimator statistics indicated a decreasing trend of sediment amount.