Performance and calibration of MPSIAC empirical model using physical conditions governing the basin, case study: Bakhtiary Basin, Lorestan Province

The purpose of this study is to verify and evaluate the error generation parameters in MPSIAC model in the Bakhtiary Basin (NE Andimeshk), then modify the model for some parts of the basin. Estimation of erosion and sediment yield in this watershed was achieved using the empirical MPSIAC model. Therefore, this model was processed in a GIS environment and the results were compared with hydrometric stations (Tang-Panj, Zardfahreh, Ghalyan and Kazem-Abad). The result of MPSIAC model in Tang-Panj station has no distinct difference with the observed data and is calibrated directly with station data. However, there are many differences between the observed and computed results in Kazem-Abad station. For calibration of this basin, some schemes should be used. Therefore, probable errors in resources were identified and initial generating error parameters were verified. Finally, some corrections were done on error resources (vegetation coverage) which improved and calibrated the MPSIAC results and then calibrated. For evaluation of this correction, the outcomes were checked in two similar basins Ghalyan and Zardfehreh.