Advanced application of time series analysis in complex karst aquifers: A case study of the Unica springs (SW Slovenia)

•Advanced application of time series analysis in complex karst systems.•Wide spatial distribution of monitoring points and high temporal data resolution.•Cross-correlation analysis not sufficient to study the effects of allogenic recharge.•An innovative approach using partial cross-correlation analysis (PCCF) is presented.•PCCF enables separation of the effects of allogenic and autogenic recharge.