DOI: 10.5194/hess-19-3047-2015
Scopus记录号: 2-s2.0-84936971682
论文题名: A 2600-year history of floods in the Bernese Alps, Switzerland: Frequencies, mechanisms and climate forcing
作者: Schulte L ; , Peña J ; C ; , Carvalho F ; , Schmidt T ; , Julià R ; , Llorca J ; , Veit H
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 7 起始页码: 3047
结束页码: 3072
语种: 英语
Scopus关键词: Atmospheric pressure
; Banks (bodies of water)
; Catchments
; Cooling systems
; Digital storage
; Geochemistry
; O rings
; Runoff
; Silicates
; Snow
; Solar radiation
; Spectrum analysis
; Surface discharges
; Annual temperatures
; Discharge estimation
; Historical floods
; Instrumental data
; North Atlantic oscillations
; Solar irradiances
; Summer temperature
; Total solar irradiance
; Floods
; aggradation
; alpine environment
; catastrophic event
; climate forcing
; documentary source
; floodplain
; geomorphology
; historical record
; melting
; North Atlantic Oscillation
; paleoclimate
; paleoflood
; river channel
; runoff
; snow cover
; spectral analysis
; Bernese Alps
; Central Alps
; Switzerland
英文摘要: A 2600-year long composite palaeoflood record is reconstructed from high-resolution delta plain sediments of the Hasli-Aare floodplain on the northern slope of the Swiss Alps. Natural proxies compiled from sedimentary, geochemical and geomorphological data were calibrated by textual and factual sources and instrumental data. No fewer than 12 of the 14 historically recorded extreme events between 1480 and the termination of the Hasli-Aare river channel correction in 1875 were also identified by coarse-grained flood layers, log(Zr / Ti) peaks and factor 1 anomalies. Geomorphological, historical and instrumental data provide evidence for flood damage intensities and discharge estimations of severe and catastrophic historical floods. Spectral analysis of the geochemical and documentary flood series and several climate proxies (TSI, δ18O, tree-rings, NAO, SNAO) identify similar periodicities of around 60, 80, 100, 120 and 200 years during the last millennia, indicating the influence of the North Atlantic circulation and solar forcing on alpine flood dynamics. The composite floodplain record illustrates that periods of organic soil formation and deposition of phyllosilicates (from the medium high catchment area) match those of total solar irradiance maxima, suggesting reduced flood activity during warmer climate pulses. Aggradation with multiple sets of flood layers with increased contribution of siliciclasts from the highest catchment area (plutonic bedrock) (e.g. 1300-1350, 1420-1480, 1550-1620, 1650-1720 and 1811-1851 cal yr AD) occurred predominantly during periods with reduced solar irradiance, lower δ18O anomalies, cooler summer temperatures and phases of drier spring climate in the Alps. Increased water storage by glaciers, snow cover and snow patches susceptible to melting processes associated with rainfall episodes and abrupt rises in temperature substantially increased surface runoff on slopes and discharges of alpine rivers. This interpretation is in agreement with the findings that the severe and catastrophic historical floods in the Aare since 1670 occurred mostly during positive SNAO (Summer North Atlantic Oscillation) pulses after years or even decades dominated by negative SNAO and cooler annual temperatures. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78473
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Physical Geography, University of Barcelona, Barcelona, Spain; Meteorological Service of Catalonia, Barcelona, Spain; Schmidt Information- and Webdesign, Düsseldorf, Germany; FluvAlps Research Group, University of Barcelona, Barcelona, Spain; Institute of Geography, University of Bern, Bern, Switzerland
Recommended Citation:
Schulte L,, Peña J,C,et al. A 2600-year history of floods in the Bernese Alps, Switzerland: Frequencies, mechanisms and climate forcing[J]. Hydrology and Earth System Sciences,2015-01-01,19(7)