Hydraulics of the Lower Goulburn Floodplain
Abstract
A key aim of the Lower Goulburn Floodplain Rehabilitation Scheme is to provide an environmentally acceptable and hydraulically sustainable solution to the flooding problems experienced on the Lower Goulburn Floodplain. To achieve these aims, substantial changes to the existing (highly modified) condition of the floodplain are necessary. In order to develop a detailed understanding of the hydraulic behaviour of the Lower Goulburn Floodplain, a state of the art, coupled 1D and 2D hydraulic model of the Lower Goulburn Floodplain has been developed based on a detailed digital elevation model developed using Airborne Laser Scanning (ALS) techniques. The hydraulic model covers some 135,000 hectares of floodplain incorporating both the Goulburn and Murray Rivers and including explicit representation of over 100 kilometres of levees and numerous hydraulic structures. An extensive model development and calibration process was undertaken to insure that the hydraulic model accurately reproduces the
observed flooding behaviour of the Lower Goulburn Floodplain.
The paper provides an overview of the development and calibration of the hydraulic model of the Lower Goulburn, and provides a brief description of the flooding behaviour of the floodplain under existing situations and the flooding behaviour anticipated following the implementation of the proposed scheme.
Authors
Guy Tierney, Gouburn Broken CMA
Trevor Dando, Sinclair Knight Merz
Steve Clark, Water Technology Pty Ltd
Tim Womersley, Water Technology Pty Ltd
Andrew McCowan, Water Technology Pty Ltd