Floods of the European Alps
The authors write that "severe floods triggered by intense precipitation are among the most destructive natural hazards in Alpine environments, frequently causing large financial and social damage," and they say that "potential enhanced flood occurrence due to global climate change would thus increase threats to settlements, infrastructure, and human lives in the affected regions." However
, they note that, currently
, "projections of intense precipitation exhibit major uncertainties" and that "robust reconstructions of Alpine floods are limited to the instrumental and historical period," giving one reason to question whether global warming
would lead to such a consequence.
What was done
In a study designed to reduce these uncertainties and extend reconstructions back in time beyond the instrumental period, Glur et al
. developed "a multi-archive Alpine flood reconstruction based on ten lacustrine sediment records, covering the past 2500 years." More specifically, they studied ten lakes situated north of the Central Alpine arc along a montane-to-Alpine transect, spanning an elevation gradient from 447 to 2068 m asl," which allowed "the extraction of a synoptic, rather than a merely local rainfall signal revealed by a single-lake study." And to verify their approach to the subject, they compared the last 500 years of their Central Alpine flood reconstruction with an independently established flood record for that period that was based on historical documents, as developed and described by Schmocker-Fackel and Naef (2010).
What was learned
"Regarding the best-characterized climatic periods during the past 2500 years," the eight researchers report that "flood activity was generally enhanced during the Little Ice Age
(1430-1850 C.E.; LIA) compared to the Medieval Climate Anomaly (950-1250
C.E.; MCA)." And they say that "this result is confirmed by other studies documenting an increased (decreased) flood activity during the LIA (MCA) in the Alps," citing the studies of Schmocker-Fackel and Naef (2010), Czymzik et al
. (2010), Wilhelm et al
. (2012) and Swierczynski et al