Hitting rock bottom: morphological responses of bedrock-confined streams to a catastrophic flood

Baggs Sargood, M.; Cohen, T. J.; Thompson, C. J.; Croke, J.

doi:https://doi.org/10.5194/esurf-3-265-2015

Articles | Volume 3, issue 2

https://doi.org/10.5194/esurf-3-265-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/esurf-3-265-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 3, issue 2

Research article

|

05 Jun 2015

Research article |

| 05 Jun 2015

Hitting rock bottom: morphological responses of bedrock-confined streams to a catastrophic flood

M. Baggs Sargood, T. J. Cohen, C. J. Thompson, and J. Croke

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Final revised paper (published on 05 Jun 2015)
Preprint (discussion started on 09 Dec 2014)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC C514: 'esurf-2014-37', Paul Carling, 13 Dec 2014
- AC C639: 'Hitting Rock Bottom', Timothy J. Cohen, 25 Feb 2015
RC C527: 'Review Comment', Jens Turowski, 06 Jan 2015
- AC C644: 'Hitting Rock Bottom in Australia', Timothy J. Cohen, 25 Feb 2015

Short summary

We document the responses of bedrock-confined rivers to an extreme flood which occurred in southeast Queensland, Australia, in 2011. Through a combination of field- and desktop-based analyses we show that widespread removal of coarse-grained mantle occurred, with boulders up to 4m in diameter being locally mobilised. We show that normalised erosion in this extreme event is scaled to basin area and that this large flood has exposed bedrock steps and straths exposing them to ongoing erosion.