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Adaptation of river channels to a wetter or drier climate: Insights from the Lower Pilcomayo River, South America

Crosato, A.; Grissetti-Vázquez, A.; Bregoli, F. ; Franca, M. J. 1
1 Institut für Wasser und Gewässerentwicklung (IWG), Karlsruher Institut für Technologie (KIT)

Abstract:

Climate change has a direct influence on both hydrology and floodplain vegetation of water courses, which are key players in river morphodynamics. The river system response to climate change is complex and the effects of non-linear interactions between alterations in water, sediment and vegetation remain incompletely understood. Which of these components becomes dominant in shaping the river channel when climate becomes drier or wetter? To answer this question, we investigate the cross-sectional response of sand-bed rivers to climate change focusing on channel width and depth, which respond directly to changes in boundary stresses. Thanks to the exceptional availability of long time-series of daily discharge and cross-sectional profiles, the Pilcomayo River is an ideal living lab for this investigation. We constructed a two-dimensional model of the river using the open-source state-of-the-art, structured Delft3D code. The highly dynamic behaviour and quick morphological adaptation of the Pilcomayo allowed reducing the period of time covered by the simulations because the river cross-section adapts its morphology to a new value of the water discharge within hours or days, which is crucial for modelling investigations. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000150021
Veröffentlicht am 17.08.2022
Originalveröffentlichung
DOI: 10.1016/j.jhydrol.2022.128254
Scopus
Zitationen: 4
Dimensions
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Wasser und Gewässerentwicklung (IWG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2022
Sprache Englisch
Identifikator ISSN: 0022-1694, 1879-2707
KITopen-ID: 1000150021
Erschienen in Journal of Hydrology
Verlag Elsevier
Band 612
Seiten Art.-Nr.: 128254
Schlagwörter Alluvial river; Pilcomayo river; Climate change; Floodplain vegetation; River morphodynamics
Nachgewiesen in Dimensions
Web of Science
Scopus
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