Description: Das Projekt "Rock boulders as indicators of soil erosion (RAISE)" wird vom Umweltbundesamt gefördert und von Universität Zürich, Geographisches Institut durchgeführt. Landscape and soil changes are strongly coupled to chemical and physical (erosion) weathering and soil production. The erosion rate is preserved in the signal of cosmogenic nuclides (e.g., 10Be) in stream sediments or even directly in a soil profile. The genesis of clastic sediments and soils has been investigated to quantify processes occurring within source areas and catchments, including chemical and physical weathering, and textural and compositional modification of detritus during transition from bedrock to grus and thereafter to soil or a fluvial environment. Well-defined (or -controlled) settings are however needed to calculate mass balances for a given (tectonically active) catchment. Measurements of mid- to long-term erosion rates have recently become more widely available through cosmogenic nuclide techniques. Still, new approaches can be developed to improve our understanding of weathering processes and their rates. Ideal settings and a considerable dataset about mineral weathering are given for the Sila massif in southern Italy (and consequently in a Mediterranean environment). It represents a tectonically active area. The upland plateaus consist of old planation surfaces, bordered by steep slopes, and are characterised by granitic spheroidal boulders which form wide boulder fields. The combination of the major tectonic and relief features with typical upland Mediterranean climate conditions promoted the triggering of severe erosion, that led to the exhumation of the boulders. Data about soil erosion amounts and rates related to the soil formation period would complete the puzzle of the driving forces and enable a more detailed interpretation of landscape and soil evolution. These boulders seemed to 'grow' out of the surface with time. Consequently, by measuring the 10Be content at different levels along a rock boulder (from the soil surface to the top of boulders), the age(s) of exposure could be derived and subsequent total denudation rates will be obtained. This would be an elegant way to calculate erosion rates for different time-steps that cover almost the entire period of soil evolution. Such an approach would give insight into a) the overall denudation and erosion rates over the whole (potential) soil formation period and b) erosion and denudation rates during time segments and would allow for the distinction of different erosion phases during the Pleistocene and Holocene c) volumes of loose material that were removed from the uplands and entered the drainage river system in this time span. (...)
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Flusssystem ? Fluss ? Zürich ? Bodendaten ? Detritus ? Skigebiet ? Erosion ? Brunnen ? Plattentektonik ? Tektonik ? Landschaftswandel ? Einzugsgebiet ? Geländerelief ? Ackerland ? Bilanz ? Bodenbildung ? Bodenprofil ? Chemikalien ? Daten ? Dränung ? Evolution ? Exposition ? Rechtsschutz ? Technik ? Wasserspeicher ? Sediment ? Boden ? Verwitterung ? Lebensalter ? Schüttgut ? Festgestein ? Mediterranes Klima ? Bodenlandschaft ? Messung ? Stoffbilanz ? Abdeckung ? Bedarf ? Indikator ? Hang ? Entwässerung ? Umwelt ? Änderung ? Klima ? Wetter ? Mineral ? Landschaft ? Gestein ? Produktion ? 10Be ? NEU ? SUEDLICH ? Schotter ? Surface exposure dating ? FORMBLAETTER ? GEHALT ? Bilanz [Betriebswirtschaft] ? GEKOPPELT ? TEKTONISCH ? VERFUEGBAR ? VERHAELTNIS ? VERWANDT ? GRENZE ? BETRAG ? ZEITRAEUME ? NUKLID ? DACH ? OBERFLAECHE ? DATENSATZ ? HOLOZAEN ? KONSERVE ? PLEISTOZAEN ? POTENZIAL ? MISCHUNG ? DAUER ? STARK ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2013-01-01 - 2014-01-31
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