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Field observations on hyperconcentrated flows in mountain torrents

1999; Wiley; Volume: 24; Issue: 3 Linguagem: Inglês

10.1002/(sici)1096-9837(199903)24

1096-9837

Ramón J. Batalla, Carmen de Jong, Peter Ergenzinger, María Sala,

Landslides and related hazards

Earth Surface Processes and LandformsVolume 24, Issue 3 p. 247-253 Research ArticleFree Access Field observations on hyperconcentrated flows in mountain torrents R. J. Batalla, Corresponding Author R. J. Batalla Department de Medi Ambient i Ciències del Sòl. Universitat de Lleida, Alcalde Rovira Roure 177, 25198 Lleida, SpainDepartment de Medi Ambient i Ciències del Sòl, Universitat de Lleida, Av. Alcalde Rovira Roure 177, E-25198 Lleida, Spain.Search for more papers by this authorC. De Jong, C. De Jong Institut für Geographische Wissenschaften, Freie Universität Berlin, Grunewaldstrasse 35, 12165 Berlin, GermanySearch for more papers by this authorP. Ergenzinger, P. Ergenzinger Institut für Geographische Wissenschaften, Freie Universität Berlin, Grunewaldstrasse 35, 12165 Berlin, GermanySearch for more papers by this authorM. Sala, M. Sala Departament de Geografia Física, Universitat de Barcelona, Baldiri i Reixac s/n, 08028 Barcelona, SpainSearch for more papers by this author R. J. Batalla, Corresponding Author R. J. Batalla Department de Medi Ambient i Ciències del Sòl. Universitat de Lleida, Alcalde Rovira Roure 177, 25198 Lleida, SpainDepartment de Medi Ambient i Ciències del Sòl, Universitat de Lleida, Av. Alcalde Rovira Roure 177, E-25198 Lleida, Spain.Search for more papers by this authorC. De Jong, C. De Jong Institut für Geographische Wissenschaften, Freie Universität Berlin, Grunewaldstrasse 35, 12165 Berlin, GermanySearch for more papers by this authorP. Ergenzinger, P. Ergenzinger Institut für Geographische Wissenschaften, Freie Universität Berlin, Grunewaldstrasse 35, 12165 Berlin, GermanySearch for more papers by this authorM. Sala, M. Sala Departament de Geografia Física, Universitat de Barcelona, Baldiri i Reixac s/n, 08028 Barcelona, SpainSearch for more papers by this author First published: 11 March 1999 https://doi.org/10.1002/(SICI)1096-9837(199903)24:3 3.0.CO;2-1Citations: 39AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Field observations on hydraulics and sediment dynamics during extreme floods in two mountain torrents show the influence of man-made constructions such as bridges and check dams, in addition to the sediment supplied naturally by the basin and the channel network, on the formation of hyperconcentrated flows. In the Pyrenean Arás basin, hyperconcentrated flow occurred after collapse of a bridge, which in turn mobilized large volumes of sediment from the stream channel and, subsequently, destroyed a series of check dams. Boulders up to several metres in size were transported in a mixture of sand and fine material. A minimum of 100000 tonnes of sediment were deposited on the alluvial fan during the event. Prior to bridge destruction, mean bedload transport rates had reached 0.4t m−1 s−1 upstream. In the alpine Lainbach basin, the flood was characterized by transportation of large amounts of slope material, including debris flows. Along its main tributary an intensive hyperconcentrated flow occurred during the rising stage, whereas in the main valley smaller flows occurred after failure of check dams. The depth of coarse material deposited reached 80 cm. The effectiveness of the Aràs and Lainbach floods was attained due to exceptional rates of energy expediture. Flood power ranged from 20000 W m−2 to 40000 W m−2 on average. Copyright © 1999 John Wiley & Sons, Ltd. Citing Literature Volume24, Issue3March 1999Pages 247-253 ReferencesRelatedInformation