Date of Publication :18th October 2023

Abstract: Environmental conditions of the basin and the relationship between groundwater and river play an important role in selecting the appropriate method for separating the base flow from flood hydrograph. This is of great importance in Abolabas karstic basin. Straight line, variable slope and recursive digital filters optimized with isotopic tracers were used to separate the base flow. Runoff was simulated by geomorphological instantaneous unit hydrograph model. GIUH model was calculated as a function of geomorphologic parameters including bifurcation ratio, area ratio, length ratio, the peak flow velocity in the outlet and the stream length of last order. In this study, two rainfall-runoff events with isotopic tracer data were studied under wet antecedent moisture conditions. RMSE, R², PEP% and PETP% showed the superiority of RDFs optimized with isotopic tracers in the flow simulation. However, two rainfall-runoff events lacking isotopic tracer data were studied under wet antecedent moisture conditions to evaluate the performance of this method. The statistical measures approved the performance of RDFs with isotopic tracers in flood hydrograph simulation.

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