Coevolution of hydrodynamics, vegetation and channel evolution in wetlands of a semi-arid floodplain

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dc.creator Seoane, Manuel
dc.creator Rodriguez, Jose F.
dc.creator Sandi, Steven G.
dc.creator Saco, Patricia M.
dc.creator Riccardi, Gerardo A.
dc.creator Saintilan, Neil
dc.creator Wen, Li 2020-02-26T23:38:01Z 2020-02-26T23:38:01Z 2015-04
dc.description.abstract The Macquarie Marshes are located in the semi-arid region in north western NSW, Australia, and constitute part of the northern Murray–Darling Basin. The Marshes are comprised of a system of permanent and semi-permanent marshes, swamps and lagoons interconnected by braided channels. The wetland complex serves as nesting place and habitat for many species of water birds, fish, frogs and crustaceans, and portions of the Marshes was listed as internationally important under the Ramsar Convention. Some of the wetlands have undergone degradation over the last four decades, which has been attributed to changes in flow management upstream of the marshes. Among the many characteristics that make this wetland system unique is the occurrence of channel breakdown and channel avulsion, which are associated with decline of river flow in the downstream direction typical of dryland streams. Decrease in river flow can lead to sediment deposition, decrease in channel capacity, vegetative invasion of the channel, overbank flows, and ultimately result in channel breakdown and changes in marsh formation. A similar process on established marshes may also lead to channel avulsion and marsh abandonment, with the subsequent invasion of terrestrial vegetation. All the previous geomorphological evolution processes have an effect on the established ecosystem, which will produce feedbacks on the hydrodynamics of the system and affect the geomorphology in return. In order to simulate the complex dynamics of the marshes we have developed an ecogeomorphological modelling framework that combines hydrodynamic, vegetation and channel evolution modules and in this presentation we provide an update on the status of the model. The hydrodynamic simulation provides spatially distributed values of inundation extent, duration, depth and recurrence to drive a vegetation model based on species preference to hydraulic conditions. It also provides velocities and shear stresses to assess geomorphological changes. Regular updates of stream network, floodplain surface elevations and vegetation coverage provide feedbacks to the hydrodynamic model. es
dc.format application/pdf
dc.format application/pdf
dc.language.iso eng es
dc.publisher EGU General Assembly 2015 es
dc.rights openAccess es
dc.rights.uri *
dc.subject Hydrodinamic, vegetal and channel evolution es
dc.subject Wetlands es
dc.subject Semi-arid floodplain es
dc.subject Macquarie Marshes es
dc.title Coevolution of hydrodynamics, vegetation and channel evolution in wetlands of a semi-arid floodplain es
dc.type conferenceObject
dc.type documento de conferencia
dc.relation.publisherversion es
dc.citation.title Geophysical Research Abstracts Vol. 17, EGU2015-6872-2, 2015 es
dc.citation.volume Vol. 17 es
dc.description.fil School of Engineering, University of Newcastle, Callaghan, NSW, Australia es
dc.description.fil Centro Universitario Rosario de Investigaciones Hidroambientales (CURIHAM) es
dc.description.fil Consejo de Investigaciones de la Universidad Nacional de Rosario es
dc.description.fil Science Division, NSW Office of Environment and Heritage, Sydney, NSW, Australia es
dc.type.collection comunicaciones

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