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CRC PUBLICATIONS |
Assessment of Salinity Management Options for Kyeamba Creek, New South Wales
Richard Cresswell,
Warrick Dawes,
Greg Summerell,
Glen Walker
Publication Type:
Technical Report
This publication is hosted by the CRC for Catchment Hydrology
CRC Program:
Landuse Impacts on Rivers
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Publication Keywords:
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Abstract / Summary:
Assessment of Salinity Management Options for Kyeamba Creek, New South Wales: Data Analysis and Groundwater Modelling
Executive Summary (Part)
Kyeamba Creek catchment, located within the uplands of the Lachlan Fold Belt of south-eastern Australia, comprises an intermediate-scale fractured rock aquifer with overlying alluvial fill in drainage lines and depressions. This study of the hydrogeological factors influencing salinity in the Kyeamba catchment was undertaken to:
o describe the physical setting and condition of the Kyeamba Creek catchment and aquifer system
o examine various data interpretations on the conceptual model of flow processes for recharge and discharge
o model the historical and present-day hydraulic head trends
o model possible future salinity mitigation scenarios for the aquifer.
The FLOWTUBE model, a simple groundwater model based on Darcy's Law, was used to simulate the variation in groundwater on the groundwater flow system. The model resolves for changes in hydraulic head induced by recharge and discharge fluxes, and lateral transfers in the direction of flow, and is represented by a hydraulic head transect along the aquifer. For the Kyeamba catchment, parameters for intermediate-scale, fractured bedrock and local-scale, alluvial aquifer systems were modelled.
Outputs from the simulation of past and present heads emphasise the dominance of the upper alluvial aquifer system generating shallow water tables and salinised areas, fed by salt pushed upward by heads in the fractured rock aquifer. The modelling generated a rapid response of water levels to modelled recharge reduction scenarios. This finding reinforces current on-ground mitigation measures in the catchment in the form of targeted revegetation, but questions the applicability of widespread reforestation.
This report is available for downloading.
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