A cost effective method for targeting gully rehabilitation effort in high priority GBR sub-catchments
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Concentrations of gully erosion have been identified in the Normanby, Bowen and upper Burdekin catchments, amongst others, where we know that a large proportion of the fine sediment delivered to the Great Barrier Reef (GBR) is sourced from gully and channel erosion (typically 80-90%). Achieving the ambitious targets for improving GBR water quality over the next decade requires thousands of these gullies to be rehabilitated. In order to prioritise the most cost-effective strategy for maximizing sediment reduction from gullies in the shortest amount of time, mangers need to know the location of individual gullies, their current erosion rates, their spatial distribution and their connectivity to the stream network. The gully prioritization approach developed for the Cape York Water Quality Improvement Plan is proposed as a data driven prioritization strategy that can be costeffectively employed (@~$0.3-$0.5/ha) within hotspot sub-catchments like the Bowen River. However, at present sufficiently high resolution data does not exist in areas other than the Normanby catchment, to enable us to prioritise specific management effort for individual gullies. This can only be achieved if there is an appropriate investment in high resolution LiDAR data to underpin a gully classification and prioritisation strategy that enables us to target individual gullies for rehabilitation. This data not only provides the basis for the gully classification and prioritization, but it forms the baseline for the monitoring strategy to test the effectiveness of the rehabilitation effort.
Proceedings of the 8th Australian Stream Management Conference
Geomorphology and Regolith and Landscape Evolution