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Envisat radar altimetry measurements of water level in a semi-arid river with complex morphology: The Lower Save, Southern Africa

2020Journal article Open access
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dc.contributor.authorLopes, Luiz Guerreiro
dc.date.accessioned2021-10-21T07:56:02Z
dc.date.available2021-10-21T07:56:02Z
dc.date.issued2020
dc.description.abstractAlthough there are numerous studies on water level changes in large rivers using satellite radar altimetry, there is no altimetry-based published study with specific focus on rivers of semi-arid areas smaller in width and with braided or wandering reaches. Taltimetry to measure water level fluctuations in a river with such characteristics. The lower Save River, a heavily silted river in Southern Africa with a dominant braided pattern, was chosen for this study. The presence of multiple narrow and shallow channels in many sections of the lower Save and the existence of sandbanks, channel bars and small islets represent additional challenges for the processing of altimetry water level measurements. High sampling rate radar altimeter data from the Envisat 35-day exact repeat mission (June 2002 to October 2010) were used in this study. The obtained altimetric water level time series do exhibit a similar variation pattern and show a reasonably good agreement with the nearest river gauge data available, especially when the hydraulic characteristics are similar along the river stretch between both monitoring points and these are not too far apart, and when the return radar signals are not so contaminated by land features. Some of the results are comparable to those from other studies for large rivers, indicating that Envisat radar altimetry can be used to derive water levels for the lower Save, a semi-arid river with relatively small widths and complex channel morphologies.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLopes, L. G. (2020). Envisat radar altimetry measurements of water level in a semi-arid river with complex morphology: The Lower Save, Southern Africa. International Journal of Emerging Trends in Engineering Research, 8(1), 23-30. DOI: 10.30534/ijeter/2020/05812020pt_PT
dc.identifier.doi10.30534/ijeter/2020/05812020pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3743
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWARSEpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSatellite radar altimetrypt_PT
dc.subjectEnvisatpt_PT
dc.subjectRiver water levelpt_PT
dc.subjectBraided riverpt_PT
dc.subjectSave Riverpt_PT
dc.subjectSouthern Africapt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleEnvisat radar altimetry measurements of water level in a semi-arid river with complex morphology: The Lower Save, Southern Africapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage30pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage23pt_PT
oaire.citation.titleInternational Journal of Emerging Trends in Engineering Researchpt_PT
oaire.citation.volume8pt_PT
person.familyNameGuerreiro Lopes
person.givenNameLuiz Carlos
person.identifierB-4961-2016
person.identifier.ciencia-id4A18-1DCB-4862
person.identifier.orcid0000-0002-6145-8520
person.identifier.scopus-author-id57205501523
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationce1b7737-282b-479c-b3a9-b7fcdae90250
relation.isAuthorOfPublication.latestForDiscoveryce1b7737-282b-479c-b3a9-b7fcdae90250

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