Implementing a Proxy-Basin Strategy to Assess the Transposability of a Hydrological Model in Geographically Similar Catchments

Hydrological modelling is the most common way to investigate spatial and temporal distribution of regional water resources. The reliability uncertainty a model depend on efficient calibration hydrological parameters. However, in complex regions where several subcatchments are defined, parameters often difficult due lack observed data. transposability models critical importance for assessing effects land use climatic changes ungauged watersheds. Our study implemented Proxy-Catchment Differential Split-Sample (PBDSS) strategy assess conceptual J2000 three different with similar physiographic conditions Western Turkey. For dry wet scenarios, was calibrated validated five years (2013–2017) two selected catchments (Kayirli Ulubey). Afterwards, it by predicting streamflow Amasya catchment, which has physical characteristics. approach comprises transferring between catchments, adjusting reflect prevailing catchment characteristics, validating without calibration. objective functions showed reliable performance Nash–Sutcliffe Efficiency (E) ranging from 0.72 0.82 when conditions. An analysis good agreement ensemble mean measured runoff, indicating that sensitive can be used estimate discharge catchments. Therefore, considered adequate its physically simulating daily streamflow.