Karst Springs in Brezovské Karpaty Mts. (Slovakia): Differences in Sensitivity to Drought Impact
摘要
Theoretical drop in springs discharges from their recorded maxima, assuming long-lasting period of zero recharge had been researched in Brezovské Karpaty Mts. (West Carpathians) in Slovakia. Discharge time-series with minimum length of 15 years and 7-day monitoring interval were collected from databases of Slovak Hydrometeorological Institute and regional waterworks BVS. Assemblage of master recession curves was performed for 26 karst springs in Triassic limestones and dolomites. Exponential equations were chosen to describe slow flow (laminar) components, sets of linear equations were chosen to describe quick flow (turbulent) outflow components. Theoretical time elapse (in days) between the median value of discharge (QMEDIAN) and discharge value of 1/10 of average discharge (0.1QAVG) was considered as appropriately characterizing its resilience to drought. For evaluated springs, this parameter was found between 29 and 118,745 days, with 740 days of mean and 6167 of median value for all 26 evaluated springs. According to this parameter, springs’ sensitivity to drought impact was classified into five classes.