The effect of altered flow regime on the frequency and duration of bankfull discharge: Murrumbidgee River, Australia
Article first published online: 8 JUN 2005
Copyright © 2005 John Wiley & Sons, Ltd.
River Research and Applications
Volume 21, Issue 5, pages 567–578, June 2005
How to Cite
Page, K., Read, A., Frazier, P. and Mount, N. (2005), The effect of altered flow regime on the frequency and duration of bankfull discharge: Murrumbidgee River, Australia. River Res. Applic., 21: 567–578. doi: 10.1002/rra.828
- Issue published online: 8 JUN 2005
- Article first published online: 8 JUN 2005
- Manuscript Accepted: 11 JUN 2004
- Manuscript Revised: 21 APR 2004
- Manuscript Received: 14 DEC 2003
- bankfull discharge;
- river regulation;
- channel–floodplain connectivity
On meandering rivers with well-developed floodplains, bankfull stage has geomorphological and ecological significance because it approximates the level of connection between the channel and the floodplain. As a river rises to bankfull stage, sediment begins to be deposited on the floodplain, wetlands are progressively inundated and organisms migrate between the channel and floodplain habitats. On many rivers large headwater dams have reduced the frequency and duration of floodplain inundation downstream. However, the lack of reliable pre-regulation flow data has made it difficult to quantify the effects of river regulation. This study used historical regulated and modelled natural flow data to determine the effects of regulation on the frequency and duration of bankfull flows on the Murrumbidgee River, one of Australia's largest and most heavily regulated rivers. In combination with floodplain surveys the flow data show that regulation has halved the frequency and duration of bankfull flows. This reduction in channel–floodplain connection has implications for the ecological health of the Murrumbidgee River. Copyright © 2005 John Wiley & Sons, Ltd.