Abstract

BUSTAMANTE-ORTEGA, Ramón Sebastián; RUTHERFORD-YOBANOLO, Patricio Fernando  and  GARCIA-LANCASTER, Alex Dan Rodrigo. Determination of base flow by three filter of separation in a catchment of Coast Mountain range, Biobío región, Chile. Tecnol. cienc. agua [online]. 2019, vol.10, n.1, pp.269-289.  Epub Apr 21, 2021. ISSN 2007-2422.  https://doi.org/10.24850/j-tyca-2019-01-11.

Several authors have demonstrated that use of empirical methodologies, such as Graphical Separation and filtering methods, generate a rational estimation of base flow, but many assumptions should be assumed in its calculation process, which difficult its comparison overall between routines programmed inside softwares. To avoid the uncertainty of source of parameters and procedure used, the aim of study was to use three separation filters of base flow (algorithms of Lyne & Hollick, Chapman and Eckhardt) which present several examples of its use around of world, where detailed clearly procedure of calculation. Example of this is the parameter, that all those filters share it and it was defined through Master Recession Curve, avoiding this way to assume its typical value of = 0.925 used regularly. Results of base flow calculated for basin located inside of field María de las Cruces, in the mountain of the coast of the south central of Chile (37°S), demonstrated that the filter Lyne & Hollick represented the behavior of base flow in function of runoff flow and moment hydrologic reflected by precipitations regime. According to data obtained of gauge station observed that present period 2009-2014, the model presented a flow of runoff compounded mainly for base flow (BFI of 0.67 in average), what is similar got with Graphical Separation method, mainly for the summer flows.

Keywords : Base flow; filters; master recessive curve; BFI index.

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