Lothar Schrott

University of Bonn | Uni Bonn ·  Department of Geography

(Abstract) We present a detailed geomorphological map (1:5000-scale) of a middle mountainous area in Jena, Germany. To overcome limitations associated with traditional field-based approaches and to extend the possibility of manually digital mapping in a structural way, we propose an approach using geographic information systems (GIS) and high-resol...

We present a detailed geomorphological map (1:5000-scale) of a middle mountainous area in Jena, Germany. To overcome limitations and to extend the possibility of manually digital mapping in a structural way, we propose an approach using geographic information systems (GIS) and high-resolution digital data. The geomorphological map features were ext...

About 10% of Europe's surface area is prone to rapid flooding of rivers confined in valleys. The devastating potential of such floods is exacerbated by the deficits of existing gauging networks, including low station densities and recording frequencies, and lack of information beyond stage height. Here, we use seismic data of the July 2021 Ahrtal f...

In high mountain regions, climatic conditions are a key factor in the development of permafrost. Next to altitudinal impact, topo-climatic and subsurface conditions further influence the occurrence of permafrost. As a result, mountain regions show extremely irregular periglacial distribution patterns which cannot be simply estimated by lapse rates...

Los Andes Áridos en el centro y norte de Argentina están caracterizados por el desarrollo de un extenso ambiente periglaciar. Sin embargo, las condiciones extremadamente difíciles de los Andes generan una gran ausencia de estudios de campo que permitan caracterizar con precisión el permafrost andino. En la Cuenca de Agua Negra, en los Andes Áridos...

Die Themen Warnung und Alarmierung der Bevölkerung hatten in den vergangenen Jahrzehnten keinen hohen Stellenwert in Deutschland. Erst durch den erstmals wieder durchgeführten, bundesweiten Warntag im September 2020, bei dem die Alarmierung allerdings nicht wie geplant funktioniert hat bzw. durchgeführt werden konnte, erhielt das Thema wieder mehr...

Extensive areas in mountain regions are under permafrost conditions with periglacial processes in the arid Andes of Argentina being mostly associated with high mountain permafrost. The most visible expression of creeping mountain permafrost within the periglacial altitudinal belt (between 35º and 27ºS), is the occurrence of rock glaciers. Beside sn...

The Andean cryosphere hosts major freshwater sources for proximal and distal inland lowlands in river catchments especially in arid and semi arid regions, providing runoff and groundwater recharge. As many watersheds in the semiarid Andes of Argentina are not at all glacierized (ice glacier) but generate numerous creeks and small rivers, periglacia...

Outsize fans are characterized by seemingly disproportionately small feeder catchments in relation to their fan area. Often having escaped rigorous scientific inquiry, the formative processes of these landforms remain inconclusive, supposedly ranging from catastrophic mass-wasting processes to gradual fluvial formation. Here we apply a multi-method...

Die Flutkatastrophe im Juli 2021 hat weite Teile von Nordrhein-Westfalen (NRW) und Rheinland-Pfalz (RLP) betroffen und dort massive Schäden mit mehr 180 Todesfällen verursacht. Damit stellt die Flutkatastrophe 2021 das tödlichste wasserbezogene Katastrophenereignis seit der Hamburger Sturmflut 1962 (Heßler & Kehrt, 2014) mit 340 Toten dar. Besonder...

This work aims to present the analysis of the internal structure, dynamics and hydrogeology of a large-sized, complex, multi-lobate and multi-root rock glacier located in the southwest of the San Juan province (31°52'59.75"S; 70°15'8.62"W), Central Andes of Argentina. The study was conducted combining electrical resistivity tomography (ERT), Differ...

The COVID-19 pandemic has revealed existing gaps in policies, systems and services, stressing the need for concerted global action on healthy aging. Similar to the COVID-19 pandemic, dementia is a challenge for health systems on a global scale. Our hypothesis is that translational potential lies in cross-country learning by involving three high-inc...

Glacier-permafrost interactions are investigated to understand glacial-hydrological influence along a partly glacierised valley on the NE flank of the Snøhetta massif, Dovrefjell, southern Norway. Of particular interest is how processes are controlled by a hydrological connection between landforms. Field mapping identified an ice-marginal landsyste...

Display material EGU2021 How spatial vegetation distribution affects soil erosion and sediment transport

This article investigates the usage of terrestrial laser scanner (TLS) point clouds for monitoring the gradual movements of soil masses due to freeze-thaw activity and water saturation, commonly referred to as solifluction. Solifluction is a geomorphic process which is characteristic for hillslopes in (high-)mountain areas, primarily alpine perigla...

The quantification of volumetric ice and water content in active rock glaciers is necessary to estimate their role as water stores and contributors to runoff in dry mountain catchments. In the semi-arid to arid Andes of Argentina, active rock glaciers potentially constitute important water reservoirs due to their widespread distribution. Here howev...

The quantification of volumetric ice and water content in active rock glaciers is necessary to estimate their role as water stores and contributors to runoff in dry mountain catchments. In the semi-arid to arid Andes of Argentina, active rock glaciers potentially constitute important water reservoirs due to their widespread distribution. Here howev...

Sediment dynamics in river catchments are controlled by tectonics, climate, and biota effecting material production on hillslopes and transport of sediment from their source to the catchment outlet. Tectonics create topography and control erodibility of the bedrock material, whereas climate controls the efficiency of weathering and transporting pro...

Rock glaciers and transitional ice‐debris complexes predominate the Central Andean landform assemblage, yet regional studies on their state of activity and their kinematics remain sparse. Here we utilize the national glacier inventory of Argentina to quantify surface velocity fields of 244 rock glaciers and 51 ice‐debris complexes, located in the C...

In the European Alps, almost half the glacier volume has disappeared over the past 150 years. The loss is reflected in glacier retreat and ice surface lowering even at high altitude. In steep glacial cirques, surface lowering exposes rock to atmospheric conditions probably for the very first time in several millennia. Instability of rockwalls has l...

Cirque erosion contributes significantly to mountain denudation and is a key element of glaciated mountain topography. Despite long-standing efforts, rates of rockwall retreat and the proportional contributions of low-, mid- and high-magnitude rockfalls have remained poorly constrained. Here, a unique, terrestrial-lidar-derived rockfall inventory (...

Abstract. The quantification of volumetric ice and water contents in active rock glaciers is necessary to estimate their role as water stores and contributors to runoff in dry mountain catchments. In the semi-arid to arid Andes of Argentina, active rock glaciers potentially constitute important water reservoirs due to their widespread distribution....

Abstract. In the European Alps almost half the glacier volume disappeared over the past 150 years. The loss is reflected in glacier retreat and ice surface lowering even at high altitude. In steep glacial cirques surface lowering exposes rock to atmospheric conditions for the very first time in many millennia. Instability of rockwalls has long been...

Abstract. Cirque erosion contributes significantly to mountain denudation and is a key element of glaciated mountain topography. Despite long-standing efforts, rates of rockwall retreat and the proportional contributions of low-, mid- and high magnitude rockfalls have remained poorly constrained. Here, a unique, terrestrial LiDAR-derived rockfall i...

Active rock glaciers represent the best visual expression of mountain permafrost that can be mapped and monitored directly using remotely sensed data. Active rock glaciers are bodies that consist of a perennially frozen ice/rock mixture and express a distinct flow-like morphology indicating downslope permafrost creep movement. Annual rates of motio...

Permafrost in northern Canada is susceptible to degradation due to rapid climate change, with hazard mapping promoted as an important activity to guide sustainable community adaptation and planning. This paper presents a framework for evaluating permafrost mapping exercises designed to inform climate change adaptation actions. We apply the framewor...

Albeit often located in the same area and climatic zone, phenomena regarding permafrost and glaciers are often studied separately. Various landforms, however, express a clear interaction of these regimes, such as ice-cored moraines. Being of glacial origin, ice-cored moraines constitute a permafrost environment. Reworking by periglacial processes i...

Albeit often located in the same area and climatic zone, phenomena regarding permafrost and glaciers are often studied separately. Various landforms, however, express a clear interaction of these regimes, such as ice-cored moraines. Being of glacial origin, ice-cored moraines constitute a permafrost environment. Reworking by periglacial processes i...

Mountain permafrost is an important geomorphological component of alpine environments with many influences and high spatial heterogeneity, having a considerable hydrological and hazard-related relevance. Hence, modeling of its distribution is an important task, especially in the densely populated Alps where a large share of infrastructure is locate...

Mountain permafrost is an important geomorphological component of alpine environments with many influences and high spatial heterogeneity, having a considerable hydrological and hazard-related relevance. Hence, modeling of its distribution is an important task, especially in the densely populated Alps where a large share of infrastructure is locate...

The high, semi-Arid Central Andes of Argentina are characterised by a widespread occurrence of permafrost and a large vertical extension of periglacial forms and processes. Particularly large rock glacier complexes with ice-rich permafrost can be considered as an important water resource in the dry regions of the Andes. In 2010, the Argentinian gov...

Active rock glaciers potentially constitute significant reservoirs and sources of water in the dry Central Andes. However, volumetric ice and water contents of Andean rock glaciers are largely unknown. In this study, the so-called four-phase model (4PM) is applied in order to quantify the material composition of the talus-derived rock glacier Dos L...

The semiarid central Andes of Argentina feature an extensive periglacial belt with a high density of rock glaciers and transitional ice-debris complexes, spurring a debate regarding their hydrological significance in the region. However, little is known about their state of activity, which can be used as a rough proxy for a rock glaciers’ ice conte...

Space plays an important role in many aspects of geomorphological research. With the advance of geographic information systems (GIS), computer-based tools for spatial analysis became easily accessible and a wealth of new algorithms was developed. Standard GIS tools for surface geometry, hydrology, and geostatistical analyses are very valuable in ge...

There is a notable discrepancy between detailed sediment budget studies in small headwater catchments (< 10² km²) focusing on the identification of sedimentary landforms in the field (e.g. talus cones, moraine deposits, fans) and large scale studies (> 10³ km²) in higher order catchments applying modeling and/or remote sensing based approaches for...

Viele der im Bevölkerungsschutzsystem verwendeten Begriffe wie z. B. „Notfall“, „Krise“ und „Katastrophe“, aber auch „Gefahr“, „Risiko“ und „Sicherheit“ werden von den beteiligten Akteuren unterschiedlich verstanden und verwendet. Die einzelnen wissenschaftlichen Disziplinen, aber auch Behörden und Institutionen haben eine eigene Fachterminologie,...

Die Bewältigung von Gefahren- und Schadenslagen setzt einen fundierten Überblick über die aktuelle und die zu erwartende Lage voraus. Daher werden zunächst unterschiedliche Vorhersage- und Prognosemethoden aus wissenschaftlicher Sicht vorgestellt und diskutiert. Ebenfalls unabdingbar sind geeignete Instrumente zur Information, Warnung und Alarmieru...

Subsurface monitoring of permafrost conditions at depths up to 20–30 m is crucial to assess the safety and reliability of mountain infrastructure, because permafrost degradation critically affects rock slope stability in high mountains. Electrical resistivity tomography (ERT) provides a straightforward tool for monitoring near-surface bedrock perma...

Active rock glaciers are indicators for permafrost in periglacial environments of high mountain areas. Within the permafrost body and the seasonally frozen active layer, these rock glaciers potentially store large amounts of water. Especially in semiarid mountain belts, such as the central Andes of Argentina, rock glaciers attain several kilometres...

Rock instability in high mountain areas poses an important risk for man and infrastructure. At 3 p.m. on 18 August 2012 a rock slide event was documented at the Kitzsteinhorn, Austria. The release zone was detected on a north-exposed rock face below the cable car summit station (3.029 m). Analysis of terrestrial laser scanning (TLS) data delivered...

Alpine regions are characterized by steep topographic gradients and high sediment fluxes conditioned by the glacial and periglacial environment. Despite substantial transport energy in mountain environments, sediment flux in large river systems is frequently disconnected from alpine headwaters. This is due to significant storage of coarse-grained s...

A detailed analysis of 150 drill core logs was used to unravel the depositional history in the area of the Saalach and Köngisseeache confluences. The spatial distribution of fluvial and limnic sediments data provided new insights into the evolution of these confluences expanding into the Salzburg Basin, Bad Reichenhall and Piding basins after the L...

In recent years, remote sensing, morphometric analysis, and other computational concepts and tools have invigorated the field of geomorphological mapping. Automated interpretation of digital terrain data based on impartial rules holds substantial promise for large dataset processing and objective landscape classification. However, the geomorphologi...

Erosion by glacial and fluvial processes shapes mountain landscapes in a long-recognized and characteristic way. Upland valleys incised by fluvial processes typically have a V-shaped cross-section with uniform and moderately steep slopes, whereas glacial valleys tend to have a U-shaped profile with a changing slope gradient. We present a novel regi...

A detailed analysis of 150 drill core logs was used to unravel the depositional history in the area of the Saalach and Kongisseeache confluences. The spatial distribution of fluvial and limnic sediments data provided new insights into the evolution of these confluences expanding into the Salzburg Basin, Bad Reichenhall and Piding basins after the L...

It is generally assumed that climate change and accelerated glacier melt lead to an increase in suspended sediment discharge from proglacial zones. This study demonstrates that the connectivity between glacial sediment production and downstream sediment fluxes during deglacierization is significantly reduced by the development of proglacial lakes....

Analysis of borehole temperature data plays a major role in a large number of polar and alpine permafrost investigations. Despite its fundamental importance relatively few scientific contributions address the technical details and challenges that are associated to the instrumentation of boreholes in permafrost-affected rock. Frequently information...