Modelling the removal of an earth bund to maximise seawater ingress into a coastal wetland

Weed infestation is a critical management issue for maintaining the natural values of coastal wetlands across world. Widespread use herbicides to control weeds has resulted in environmental issues past and led search more methods such as using saline water. This study investigates options restore flow regimes between freshwater seawater by removing bund which was built grow ponded pasture. The carried out Mungalla wetland Queensland, an important Nywaigi aboriginal community asset recreation, cultural economic activities. used modelling monitoring (a) assess how effective earth excluding (b) extent could enter without bund. Eleven scenarios were investigated estimate ingress under different tide, onshore wind, low atmospheric pressure sea level rise (SLR) conditions. Results show that removal reinstated periodic tidal into wetland. Seawater intrusion also shown increase when there winds and/or associated with cyclones. greatest impact future SLR, where large increases inundation frequency are likely cause shift vegetation towards native salt tolerant species. Findings this useful examining potential various interventions being considered system repair. For example, or height adjustment barriers, dredging silted streams, from choked streams reintroduction flows weed infestation, improve water quality wetlands. • Successful application 2D hydrodynamic model A priori evaluation effect (or introducing) manmade barriers movement region. Assessing impacts SLR on duration