Description: Das Projekt "Debris flow management and risk assessment in the alpine region" wird vom Umweltbundesamt gefördert und von Universität Berlin, Institut für Geographische Wissenschaften durchgeführt. Objective: The project aims to produce a few example evaluations of Debris Flow Risk in selected areas, forecasting the occurrence and behaviour of such flows, identifying areas prone to debris flow risk in some experimental basins, and defining an exemplified methodology for the evaluation of debris flos risk in prone areas that can be used by the concerned agencies. General Information: In order to reach the objectives some basic laboratory experiments are performed aiming to gain better information on the mechanical behaviour of mixtures of different grain sizes including segregation effects, and to refine the rheological description of the transition between quasi static conditions, typical of geotechnical analysis, and collision dominated conditions, typical of development flow behaviour, both in granular and muddy debris flows. Refined channel experiments are performed on free surface granular, muddy and intermediate debris-flows, specially aimed for testing mathematical models, as well as simple experiments on possible triggering mechanisms of debris flow. Mathematical models representing the behaviour of debris flow are developed and implemented. 1-D and 2-D models will be used. 2-D models may be both vertically integrated (2DH) and plane vertical flow (2DV). The variety of models represent the effects of erosion and deposition, as well as the vertical segregation and longitudinal differential convection mechanisms, responsible of the concentration of great boulders in the front of the debris flood event. Models are verified and calibrated against laboratory tests and prototype data. Field investigations are performed in order to identify debris source areas and to estimate the debris production and accumulation rates. Debris flow events in the investigation areas are monitored and surveyed as well as their triggering conditions (precipitation, water table elevation, initial saturation index). Precise geological, geotechnical, geomorphologic and hydrometeorological characterisations of the investigation areas are performed, including specific laboratory tests whenever necessary, as well as back analysis (hind-casting) and dating of past events. A frequency-intensity relation will be established for the areas. The areas selected for field investigation are: left slopes of Boite river valley, Veneto, Italy; subbasins of vallie Maurienne, Savoie-France, (Saint Bernard Saint-Martin-la-Porte, le Pousset la Pousset); rio Moscardo basin, Friuli Venezia Giulia-Italy; Schmiedlaine basin, Bayern-Germany. At the end of these activities, the debris flow occurrence in the selected areas will be analysed using verified and calibrated models, the implied risk will be assessed and the results translated into risk and hazard maps. Prime Contractor: Universita degli Studi di Bologna, Dipartimento di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rivelamento, del Territorio; Bologna; Italy.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Bayern ? Berlin ? Gerinne ? Hydrometeorologie ? Wasserstraße ? Fluss ? Rheologie ? Gefahrenkarte ? Raffination ? Erosion ? Thematische Karte ? Bundesrepublik Deutschland ? Frankreich ? Italien ? Geschiebefracht ? Orographie ? Schlamm ? Geologischer Prozess ? Flugzeug ? Vertikalprofil ? Geologie ? Risikoanalyse ? Bodenqualität ? Abfall ? Daten ? Deposition ? Korngröße ? Feldstudie ? Laborversuch ? Hochgebirge ? Lockergestein ? Marktforschung ? Effektkonzentration ? Alpen ? Mathematisches Modell ? Geofaktor ? Bodenbelastung ? Prognosemodell ? Grundwasserstand ? REACH ? Schuttstrom ? Schutt ? Risiko ? Standortbedingung ? Stoffstrom ? Stofftransport ? Geomorphologie ? Gefahrenvorsorge ? Tal ? Gestein ? Niederschlag ? Risikobewertung ? Hang ? Geröll ? Prototyp ? Schotter ? Ablagerung ? Häufigkeit [Ereignis] ?
Region: Berlin
Bounding box: 10.44987° .. 10.44987° x 54.03573° .. 54.03573°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1996-10-01 - 1999-03-31
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