In this "business as usual" climate change scenario a tipping point is reached early in the simulation and Antarctic ice sheet melting starts contributing significantly to global sea level rise, as suggested by DeConto & Pollard (2016). In response, the dynamics and landscape of the NSW north coast and Queensland Gold Coast are strongly impacted. For the initial part of the simulation (2020-2200) basin impacts are relatively similar to those seen under RCP 8.5. Eventually, the onset of major West Antarctic ice sheet melting causes accelerated sea level rise and this forces sediment deposition upstream, resulting in deposition of ~315 million m3 of volcanic sediments within the floodplain by 2500 with an average thickness of ~11.5 m, associated with severe inundation of the entire coastline. The increase in floodplain sedimentation causes a significant rise in elevation within the area by 2500. Increased coastal sedimentation is not sufficient to fill the accommodation space formed by extreme rates of sea-level rise.

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