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Predicting floodplain inundation and vegetation dynamics in arid wetlands

conference contribution
posted on 2024-03-18, 22:49 authored by SG Sandi, PM Saco, G Kuczera, L Wen, N Saintilan, JF Rodriguez
The Macquarie Marshes is a freshwater wetland system located in semiarid Australia. The ecological importance of this site has been recognized under the Ramsar convention. Plant associations in the marshes has shown a complex dynamic where some wetland vegetation patches have transitioned to terrestrial vegetation during severe drought, but also quickly responded to increased inflows due to record and near record rainfall accompanied by water releases from an upstream reservoir. Management decisions regarding the environmental flows require the use of predictive tools in order to assess the response of the vegetation. We have developed a vegetation response model that couples hydrodynamic modelling of the northern Macquarie Marshes with watering requirements of different plant associations and vegetation succession rules. The model simulates floods in the wetland during a series of years, after which patches of vegetation are analysed according to water depth, percent exceedance time and frequencies of inundation. During the simulated period, the patch can have adequate watering conditions, or it can have critical conditions that would lead to a succession to another type of vegetation. The predicted vegetation is reintroduced in the model, providing feedbacks for the next simulation period. In this contribution, we implemented the model to simulate changes of wetland understory during the period 1991 to 2014.

History

Volume

40

Location

FRANCE, Lyon

Start date

2018-09-05

End date

2018-09-08

ISSN

2267-1242

eISSN

2267-1242

Language

English

Publication classification

EN.1 Other conference paper

Editor/Contributor(s)

Paquier A, Riviere N

Title of proceedings

E3S Web of Conferences

Event

9th International Conference on Fluvial Hydraulics (River Flow)

Publisher

E D P SCIENCES

Place of publication

Les Ulis, France

Series

E3S Web of Conferences