Baseflow Analysis of the Pasak River Basin
DOI:
https://doi.org/10.14456/rmutlengj.2025.8Keywords:
baseflow, digital filter, digital graphicAbstract
This research aims to determine the appropriate parameter values for baseflow analysis of the Pasak River Basin and to identify suitable methods for baseflow separation. The study focuses on monitoring stations S.33 and S.4B, located in the upper part of the Pasak River Basin. The BFI+ model was used to obtain suitable parameter values and to evaluate the accuracy of five selected methods. These methods include four iterative digital filter methods (Lynie & Hollick, Chapman, EWMA, and Boughton two-parameter) and one graphical digital
method (Local Minimum), based on daily hydrological data. The results indicate that all five methods effectively
separate the baseflow at both monitoring stations in the Pasak River Basin. Among them, the Lynie & Hollick method demonstrated higher accuracy compared to the other four methods. Additionally, the optimal parameter values for both monitoring stations were found to be similar. This research highlights the importance of selecting appropriate baseflow separation methods and accurately calibrating parameters to ensure precise and reliable baseflow analysis in the Pasak River Basin.
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