Modelling estuarine wetlands under climate change and infrastructure pressure

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dc.creator Trivisonno, Franco N.
dc.creator Rodriguez, Jose F.
dc.creator Riccardi, Gerardo A.
dc.creator Saco, Patricia M.
dc.creator Stenta, Hernan R. 2020-03-03T02:28:28Z 2020-03-03T02:28:28Z 2013-12
dc.description.abstract Abstract: Estuarine wetlands are an extremely valuable resource in terms of biotic diversity, flood attenuation, storm surge protection, groundwater recharge, filtering of surface flows and carbon sequestration. The survival of these systems depends on a balance between the slope of the land, and the rates of accretion and sea-level rise. Climate change predictions for most of Australia include both an accelerated sea level rise and an increase on the frequency of extraordinary river floods, which will endanger estuarine wetlands. Furthermore, coastal infrastructure poses an additional constraint on the adaptive capacity of these ecosystems. In recent years a number of numerical models have been developed in order to assess wetland dynamics and to help manage some of these situations. In this paper we present a wetland evolution model that is based on computed values of hydroperiod and tidal range that drive vegetation preference. Results from a 2D spatially distributed model of wetland dynamics in area E of Kooragang Island (Hunter estuary, NSW) are presented as an example of a system heavily constricted by infrastructure undergoing the effects of sea level rise. Area E presents a vegetation zonation sequence mudflats - mangrove - saltmarsh from the seaward margin and up to the topographic gradient and is compartmentalized by the presence of internal culverts. The model includes a detailed hydrodynamic module (CTSS8), which is able to handle man-made flow controls and spatially varying roughness. The model continually simulates tidal inputs into the wetland and computes annual values of hydroperiod and tidal range to update vegetation distribution based on preference to hydrodynamic conditions of the different vegetation types. It also computes soil accretion and carbon sequestration rates and updates roughness coefficient values according to evolving vegetation types. In order to further explore the magnitude of flow attenuation due to roughness and its effects on the computation of tidal range and hydroperiod, numerical experiments were carried out simulating floodplain flow on the side of a tidal creek using different roughness values. Even though the values of roughness that produce appreciable changes in hydroperiod and tidal range are relatively high, they are within the range expected for some of the wetland vegetation. Both applications of the model show that flow attenuation plays a major role in wetland hydrodynamics and that its effects must be considered when predicting wetland evolution under climate change scenarios, particularly in situations where existing infrastructure affects the flow. es
dc.format application/pdf
dc.format application/pdf
dc.language.iso eng es
dc.publisher Piantadosi, J., Anderssen, R.S. and Boland, J. es
dc.rights openAccess es
dc.rights.uri *
dc.subject Vegetation dynamics es
dc.subject Estuarine wetlands es
dc.subject Sea-level rise es
dc.title Modelling estuarine wetlands under climate change and infrastructure pressure es
dc.type conferenceObject
dc.type documento de conferencia
dc.type publishedVersion
dc.citation.title MODSIM 2013. 20th International Congress on Modelling and Simulation Adapting to change: the multiple roles of modelling es
dc.contributor.organizer Modelling and Simulation Society of Australia and New Zealand Inc. es
dc.description.fil School of Engineering, University of Newcastle, Callaghan, NSW, Australia es
dc.description.fil Departamento de Hidráulica, Escuela de Ingenieria Civil, Fac. de Cs. Exactas, Ingenieria y Agrimensura, Universidad Nacional de Rosario 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.type.collection comunicaciones
dc.type.version publishedVersion es

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