Consiglio Nazionale delle Ricerche

Tipo di prodottoArticolo in rivista
TitoloGlacier melt runoff controls bedload transport in Alpine catchments
Anno di pubblicazione2019
Formato-
Autore/iComiti, F., Mao, L., Penna, D., Dell'Agnese, A., Engel, M., Rathburn, S., Cavalli, M.
Affiliazioni autoriFaculty of Science and Technology, Free University of Bozen-Bolzano, Piazza Università 5, Bolzano, 39100, Italy School of Geography, University of Lincoln, Brayford Pool, Lincoln, LN6 7TS, United Kingdom Instituto de Geografía, Pontificia Universidad Católica de Chile, Chile Department of Agriculture, Food, Environment and Forestry, University of Florence, Via S. Bonaventura, 13, Firenze, 50145, Italy Department of Geosciences, Colorado State University, Fort Collins, CO 80523, United States Research Institute for Geo-Hydrological Protection (IRPI), National Research Council (CNR), Corso Stati Uniti 4, Italy, 35127, Italy
Autori CNR e affiliazioni
  • MARCO CAVALLI
Lingua/e
  • inglese
AbstractResearch on factors affecting sediment regime in glacierized catchments under warming climates is still scarce despite its societal relevance. In particular, coarse bedload transport has never been quantitatively related to water runoff origin (snowmelt vs glacier melt), which provides important information on the role of different sediment sources (glaciers vs hillslopes and channel bed). Drawing on data from multiple spatial and temporal scales in a paradigmatic Alpine glacierized catchment, we show that glacier melt flows play a key role in coarse sediment transport dynamics. Bedload concentration measured during glacier melt flows is up to 6 orders of magnitude larger than during snowmelt. At the catchment scale and within the channel, however, minimal aggradation and degradation was detected over almost a decade. In addition, sedimentation rates at a hydropower weir, inferred from flushing frequency during the last four decades, are tightly associated to summer air temperature and not to precipitation trends, and most of sediment export occurred in July-August. However, sediment flushing frequency has been decreasing since the late 1990s despite very warm summers in the following decades. Collectively, these findings indicate that sediment is dominantly sourced from within glacier-covered areas and that transport rates are thus dictated by seasonal and multi-annual glacial dynamics. As glacier melt flows decrease due to ice mass loss, our results suggest that, for similar basins, a progressive shift from supply-limited (driven by glacier activity) to transport-limited (during rainfall-induced events) sediment transport will occur, disrupting the current near-equilibrium channel conditions.
Lingua abstractinglese
Altro abstract-
Lingua altro abstract-
Pagine da77
Pagine a86
Pagine totali-
RivistaEarth and planetary science letters
Attiva dal 1966
Editore: Elsevier - Amsterdam
Paese di pubblicazione: Paesi Bassi
Lingua: inglese
ISSN: 0012-821X
Titolo chiave: Earth and planetary science letters
Titolo proprio: Earth and planetary science letters.
Titolo abbreviato: Earth planet. sci. lett.
Numero volume della rivista520
Fascicolo della rivista-
DOI10.1016/j.epsl.2019.05.031
Verificato da refereeSì: Internazionale
Stato della pubblicazionePublished version
Indicizzazione (in banche dati controllate)
  • Scopus (Codice:2-s2.0-85066505348)
Parole chiaveglacier retreat, global warming, stable water isotopes, sediment transport
Link (URL, URI)https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066505348&doi=10.1016%2fj.epsl.2019.05.031&partnerID=40&md5=8ed5ddbc8815cc4fb8d663df29810f8a
Titolo parallelo-
Data di accettazione-
Note/Altre informazioni-
Strutture CNR
  • IRPI — Istituto di ricerca per la protezione idrogeologica
Moduli/Attività/Sottoprogetti CNR
  • DTA.AD003.027.001 : Geomorfometria e dinamiche del sedimento nei bacini montani
Progetti Europei-
Allegati