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

Seoane, Manuel; Rodriguez, Jose F.; Sandi, Steven G.; Saco, Patricia M.; Riccardi, Gerardo A.; Saintilan, Neil; Wen, Li

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

dc.citation.title	Geophysical Research Abstracts Vol. 17, EGU2015-6872-2, 2015	es
dc.citation.volume	Vol. 17	es
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
dc.date.accessioned	2020-02-26T23:38:01Z
dc.date.available	2020-02-26T23:38:01Z
dc.date.issued	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.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.format	application/pdf
dc.format	application/pdf
dc.identifier.uri	http://hdl.handle.net/2133/17674
dc.language.iso	eng	es
dc.publisher	EGU General Assembly 2015	es
dc.relation.publisherversion	https://meetingorganizer.copernicus.org/EGU2015/EGU2015-6872-2.pdf	es
dc.rights	openAccess	es
dc.rights.uri	http://creativecommons.org/licenses/by-nc-sa/2.5/ar/	*
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.type.collection	comunicaciones