Assessment of sediment yield estimations for large watershed areas: a case study for the Seyhan, Demirkopru and Hirfanli reservoirs in Turkey

Kokpinar, M. Ali
Altan Sakarya, Ayşe Burcu
Göğüş, Mustafa
Analyses of data from reservoir surveys and sediment rating curves are compared to predict sediment yield in three large reservoir watershed areas in Turkey. Sediment yield data were derived from reservoir sedimentation rates and suspended sediment measurements at gauging stations. The survey data were analysed to provide the volume estimates of sediment, the time-averaged sediment deposition rates, the long-term average annual loss rates in the reservoir storage capacity, and the long-term sediment yield of the corresponding watershed areas. Four regression methods, including linear and nonlinear cases, were applied to rating curves obtained from gauging stations. Application of the efficiency test to a power function form of a rating curve with nonlinear regression yielded the highest efficiency values. Based on the analysis of the sediment rating curves, sediment load fluxes were calculated by using average daily discharge data at each gauging station. Comparison of these two sediment yield values for each reservoir showed that the sediment yields from the suspended sediment measurements, SYGS, are 0.99 to 3.54 times less than those obtained from the reservoir surveys, SYRS. The results from the reservoir surveys indicate that all three reservoirs investigated have lost significant storage capacity due to high sedimentation rates. ResumeCet article compare les analyses de donnees provenant d'enquetes realisees sur des reservoirs, et de courbes de tarage sedimentaires, pour estimer la production en sediments de trois grands bassins versants alimentant des reservoirs en Turquie. Les donnees de rendement en sediments ont ete obtenues a partir des taux de sedimentation dans les reservoirs et des mesures de sediments en suspension aux stations de jaugeage. Les donnees de l'enquete ont ete analysees pour fournir les estimations de volume de sediments, les taux moyens de depot des sediments, la moyenne a long terme des taux de pertes annuelles de capacite de stockage du reservoir, et la production de sediments a long terme des bassins versants correspondants. Quatre methodes de regression, incluant les cas lineaire et non lineaire, ont ete appliquees aux courbes de tarage obtenues aux stations de jaugeage. L'application d'un test d'efficacite a une forme de fonction puissance d'une courbe de tarage avec la regression non lineaire a donne les meilleures valeurs d'efficacite. En se basant sur l'analyse des courbes de tarage sedimentaires, les flux de charge de sediments ont ete calcules en utilisant la moyenne des donnees de debits journaliers a chaque station de jaugeage. La comparaison de ces deux valeurs de rendement en sediments pour chaque reservoir a montre que les rendements de sediments a partir des mesures de sediments en suspension, SYGS, sont de 0,99 a 3,54 fois moins eleves que ceux obtenus a partir des enquetes sur les reservoirs, SYRS. Les resultats des enquetes sur les reservoirs ont indique que les trois reservoirs etudies ici ont perdu de maniere significative leurs capacites de stockage en raison de taux eleves de sedimentation.


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Citation Formats
M. A. Kokpinar, A. B. Altan Sakarya, Ş. Y. KUMCU, and M. Göğüş, “Assessment of sediment yield estimations for large watershed areas: a case study for the Seyhan, Demirkopru and Hirfanli reservoirs in Turkey,” HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, pp. 2189–2203, 2015, Accessed: 00, 2020. [Online]. Available: