A debris flow calendar derived from sediments of lake Lago di Braies (N. Italy)

Irmler, Ralf; Daut, Gerhard; Mäusbacher, Roland

doi:10.1016/j.geomorph.2006.01.013

Cited by 49 publications

(50 citation statements)

References 8 publications

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“…Lake Ledro's flood frequency for the last 1300 yr, compared with debris flow records from Lago di Braies (Dolomite Alps, 150 km NE from Lake Ledro (Irmler et al, 2006), with Alpine temperatures reconstructed from tree-ring studies (Büntgen et al, 2006;Corona et al, 2011) and with total solar insolation reconstructed from 10 Be records (Delaygue and Bard, 2011). and climate reconstructions (Fig. 8).…”

Section: Variability In Flood Frequency During the Last Millennium Anmentioning

confidence: 99%

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Orbital changes, variation in solar activity and increased anthropogenic activities: controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy

et al. 2013

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Abstract. Two lacustrine sediment cores from Lake Ledro in northern Italy were studied to produce chronologies of flood events for the past 10 000 yr. For this purpose, we have developed an automatic method that objectively identifies the sedimentary imprint of river floods in the downstream lake basin. The method was based on colour data extracted from processed core photographs, and the count data were analysed to capture the flood signal. Flood frequency and reconstructed sedimentary dynamics were compared with lake-level changes and pollen inferred vegetation dynamics. The results suggest a record marked by low flood frequency during the early and middle Holocene (10 000–4500 cal BP). Only modest increases during short intervals are recorded at ca. 8000, 7500, and 7100 cal BP. After 4500–4000 cal BP, the record shows a shift toward increased flood frequency. With the exception of two short intervals around 2900–2500 and 1800–1400 cal BP, which show a slightly reduced number of floods, the trend of increasing flood frequency prevailed until the 20th century, reaching a maximum between the 16th and the 19th centuries. Brief-flood frequency increases recorded during the early and middle Holocene can be attributed to cold climatic oscillations. On a centennial time scale, major changes in flood frequency, such as those observed after ca. 4500/4000 and 500 cal BP, can be attributed to large-scale climatic changes such as the Neo-glacial and Little Ice Age, which are under orbital and possibly solar control. However, in the Bronze Age and during the Middle Ages and modern times, forest clearing and land use probably partially control the flood activity.

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Section: Variability In Flood Frequency During the Last Millennium Anmentioning

confidence: 99%

“…8). The first comparison concerns the debris-flow calendar from Lago di Braies (150 km northeast of Lake Ledro; Irmler et al, 2006). Taking into account the uncertainty in the radiocarbon chronologies, both records show strong similarities in their time series.…”

Section: Variability In Flood Frequency During the Last Millennium Anmentioning

confidence: 99%

Orbital changes, variation in solar activity and increased anthropogenic activities: controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy

et al. 2013

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“…In more recent times they were studied by Lee and Duncan (1975), Nishizawa and Chiba (1979), Evans (1984Evans ( , 1986, Schuster (1985), Soldati and Tosatti (1993), Casagli et al (1995), Carotta (1997), Irmler et al (2006), Cencetti et al (2011), Savelli et al (2012.…”

Section: Introductionmentioning

confidence: 99%

Geomorphological investigations on landslide dams

Stefanelli

Catani

Casagli

2015

GEOENVIRON DISASTERS

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Background: The study of past landslide dams and their consequences has gained a considerable significance for forecasting induced hydraulic risk on people and property. Landslide dams are rather frequent in Italy, where a broad climatic, geological and morphological variability characterize different part of the peninsula, and have already been studied in literature, focusing different geographical regions with different levels of detail. In order to develop specific tools to assess the landslide dam formation and stability, the first step is to realize a large data archive including a big number of data, collected with a consistent methodology to standardize the quality. Description: For this reason, this paper reports the results of an extensive bibliographic work and geomorphologic investigation on landslide dams that lead to the development of the wider systematic inventory in Italy. Through the revision and the update of scientific works and historical reports, three hundreds of landslide dams from the Alps to the Southern Apennine and Sicily were identified. During investigations and through cartographic and aerial photos interpretation, several geomorphic parameters of the landslide, the dam body, the valley and the lake, if any, have been determined, or estimated using historical and bibliographical documents analysis. Conclusions: The collected data were resumed in a database, formed by 57 information fields easy to collect and measure to privilege intuitive usability and future implementation. In order to describe the characteristics of landslide dams in Italy some specific analysis on the different types of landslide movements and their volume, the dam longevity, the main triggers and their geographical distribution were carried out.

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“…Its transport capacity is thus increased and they will form specific deposits in underwater environments due to their higher density and sediment cohesion (Mulder and Alexander, 2001). Typical deposits are composed of a load cast layer containing a basal erosive surface, which is overlain by a fining-upward layer comprising the finer sediment fractions (Sletten et al, 2003;Irmler et al, 2006). The second main type of input can be attributed to wetsnow avalanches that occur mostly over springtime.…”

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confidence: 99%

“…Wet avalanches in lacustrine deposits have been identified by Vasskog et al (2011) using grain size analysis to identify layers of poorly sorted grain accumulation associated with gravels resulting in a multi-modal grain size distribution. Such deposits on lake ice would result in drop stones at thaw season (Luckman, 1975), and may contain such deposits on lake ice would result in drop stones at thaw season, and may contain terrestrial organic matter (OM; Irmler et al, 2006;Wilhelm et al, 2013;Korup and Rixen, 2014).…”

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confidence: 99%

A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

et al. 2017

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Abstract. Over the past decades, X-ray computed tomography (CT) has been increasingly applied in the geosciences community. CT scanning is a rapid, non-destructive method allowing the assessment of relative density of clasts in natural archives samples. This study focuses on the use of this method to explore instantaneous deposits as major contributors to sedimentation of high-elevation lakes in the Alps, such as the Lake Lauvitel system (western French Alps). This lake is located within a very steep valley prone to episodic flooding and features gullies ending in the lake. This variety of erosion processes leads to deposition of sedimentary layers with distinct clastic properties. We identified 18 turbidites and 15 layers of poorly sorted fine sediment associated with the presence of gravels since AD 1880. These deposits are respectively interpreted as being induced by flood and wet avalanche. This constitutes a valuable record from a region where few historical records exist. This CT scan approach is suitable for instantaneous deposit identification to reconstruct past evolution and may be applicable to a wider variety of sedimentary archives alongside existing approaches.

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A debris flow calendar derived from sediments of lake Lago di Braies (N. Italy)

Cited by 49 publications

References 8 publications

Orbital changes, variation in solar activity and increased anthropogenic activities: controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy

Orbital changes, variation in solar activity and increased anthropogenic activities: controls on the Holocene flood frequency in the Lake Ledro area, Northern Italy

Geomorphological investigations on landslide dams

A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

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