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Koblenz, Germany

Wastl M.,Koblenz University | Stotter J.,University of Innsbruck | Kleindienst H.,GRID IT Gesellschaft fur angewandte Geoinformatik mbH
Natural Hazards | Year: 2011

This paper presents an assessment of the avalanche hazard potential and the resulting risks on mountain roads for a 38.7-km-long section of road no 76 (Siglufjar{eth}arvegur) in northern Iceland following a regional scale approach developed in the Alps. The assessment of the individual avalanche death risk proved applicable to distinguish areas of avalanche hazard with a risk above the accepted level, which should be given priority in following detailed investigations and the planning of possible protective measures, from road sections where the avalanche death risk is low and accepted according to international practice. The cumulative individual and collective avalanche death risks in the investigated road section provide a comparable measure for assessing the avalanche hazard both within the Icelandic public road network and on an international scale. The case study on road no 76 in northern Iceland shows that a standardised regional scale risk-based approach is practical to determine, analyse and assess the avalanche hazard situation on mountain roads in Iceland and guarantees comprehensible, reproducible and comparable results as a basis for a sustainable planning of measures. © 2011 Springer Science+Business Media B.V. Source


Herget J.,University of Bonn | Euler T.,University of Bonn | Roggenkamp T.,University of Bonn | Zemke J.,Koblenz University
Hydrology Research | Year: 2013

Pleistocene megafloods generated several large-scale obstacle marks that could not be interpreted hydraulically with the present knowledge of submerged obstacles. Thus, flume and field data of classical obstacle marks, characterised by a frontal scour hole and an adjacent depositional ridge, are analysed to estimate flow velocities from obstacle mark geometry, especially scour depths, length, width and ridge width. These data reveal a consistency of correlations between obstacle mark morphometries across a wide spatial scale. Two existing analytical models, basically integrating obstacle size, flow velocity as well as sediment size and grading, are transformed so that the magnitude of individual geometric parameters can be used as variables for the estimation of mean and tip flow velocities. These reconstructed velocities have to be regarded as minimum velocities during the rising limb of the hydrograph, as peak discharge might not last long enough to significantly influence the obstacle mark dimensions. A universally applicable practical outline is developed for palaeohydraulic reconstruction. This framework is applied on three examples of obstacle marks generated by Pleistocene megafloods. The reliability and scale-invariance of these reconstructions is confirmed by similar results of velocity estimations by other independent approaches at the same locations. © 2013 IWA Publishing. Source


Simons L.P.A.,Technical University of Delft | Hampe J.F.,Koblenz University
HEALTHINF 2012 - Proceedings of the International Conference on Health Informatics | Year: 2012

There is an existing Health (e)Coach Solution for supporting intensive lifestyle changes, which may help reduce cancer progression risks in men with low grade prostate cancer. An important challenge is to support and motivate healthy behaviors for the long term (4 years). Smart phones are increasingly used also in this age group. And mobile apps offer significant opportunities for personalized health behavior monitoring and support. Our overall proposition is that an mApps suite, as an extension to an existing online dashboard with automated emails and interpersonal coach sessions, appears promising for improving long term health behavior support. That is, if three conditions are met: 1) Using best of breed mApps from the market (benefits like ease-of-use, continuity, customer support); 2) creating easy and meaningful score conversions (from mApps to personal dashboard); 3) using automated emails as glue between three key aspects personal progress/dashboarding, user attention and motivation, mApp usage. As methodological approach, this paper focuses on two phases from a design research cycle: requirements analysis and a preliminary design solution exploration. In the analysis phase, two questions are addressed: What are effective lifestyle intervention components according to literature? What are solution properties that may enhance motivation and improve health behaviors? In the solution exploration phase our design question is how a proposed mApp extension may likely add value to the existing Health (e)Coach solution. Source

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