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dc.date.accessioned2015-01-23T08:05:39Z
dc.date.available2015-01-23T08:05:39Z
dc.date.created2014-09-11T15:25:17Z
dc.date.issued2014
dc.identifier.citationBeltaos, Spyros Kääb, Andreas . Estimating river discharge during ice breakup from near-simultaneous satellite imagery. Cold Regions Science and Technology. 2014, 98, 35-46
dc.identifier.urihttp://hdl.handle.net/10852/41894
dc.description.abstractRiver ice breakup has many socio-economic and ecological implications that primarily result from the formation and release of major ice jams. A key driver of breakup processes is the river discharge, but the presence of fractured ice sheets or moving ice rubble render its measurement or estimation very difficult. Here, we exploit the fact that the acquisitions of individual images of a satellite stereo scene are separated by about one minute. Between three stereo images taken from the PRISM instrument onboard the Japanese ALOS satellite on May 20, 2010, we track the displacements of river ice debris using automatic image correlation along a 40 km long reach of the Mackenzie River, just above the entrance to its delta. This results in an almost complete ice velocity field over the river area studied with a spatial resolution of 25 m and an accuracy of ~ 0.07 m/s for the speeds. Channel bathymetry, slope, and hydraulic resistance along the study reach, known from previous studies, are then utilized to compute discharge at 15 cross sections. Calculated values vary from ~ 20,000 to ~ 27,000 m3/s and are comparable to 23,800, the value estimated by Water Survey of Canada. Variability is much smaller, and close to that of conventional flow measurements, within the relatively straight sub-reach immediately upstream of the delta, where the effects of boundary constraints caused by a sharp bend farther upstream are minimal. This study proves for the first time that it is feasible to estimate river discharge during ice breakup at a reasonable accuracy using near-simultaneous satellite images. While this work had to rely on data that were coincidentally contained in satellite archives, special satellite or aircraft acquisitions could greatly enhance the probability of obtaining suitable data and thus the applicability of the method.
dc.languageEN
dc.publisherElsevier Science
dc.titleEstimating river discharge during ice breakup from near-simultaneous satellite imagery
dc.typeJournal article
dc.creator.authorBeltaos, Spyros
dc.creator.authorKääb, Andreas
cristin.unitcode185,15,22,0
cristin.unitnameInstitutt for geofag
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.fulltextpreprint
cristin.qualitycode2
dc.identifier.cristin1153765
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Cold Regions Science and Technology&rft.volume=98&rft.spage=35&rft.date=2014
dc.identifier.jtitleCold Regions Science and Technology
dc.identifier.volume98
dc.identifier.startpage35
dc.identifier.endpage46
dc.identifier.doihttp://dx.doi.org/10.1016/j.coldregions.2013.10.010
dc.identifier.urnURN:NBN:no-46308
dc.type.documentTidsskriftartikkel
dc.source.issn0165-232X
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/41894/3/BeltaosKaab_pre.pdf
dc.type.versionSubmittedVersion


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