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Gully Initiation and Implications for Management of Scour Holes in the Vicinity of the Jabiluka Mine, Northern Territory, Australia
Authors:MJ Saynor  Wayne D Erskine  KG Evans  I Eliot
Institution:Environmental Research Institute of the Supervising Scientist, Darwin, NT, Australia; Department of Geography, University of Western Australia, Crawley, WA, Australia; Office of the Supervising Scientist, Darwin, NT, Australia; School of Geosciences, University of Sydney, Sydney, NSW, Australia
Abstract:A track across a burnt grass swale was used intensively on the Jabiluka Mineral Lease (located adjacent to Kakadu National Park in the seasonally wet tropics of the Northern Territory, Australia) for a short time period during the 1998 dry season. Repeated vehicle passes over the burnt grass increased soil bulk density and locally disrupted the root and algal mat, lowering the critical shear stress for sediment transport. Overland flow during the next wet season was above average and eroded eleven discontinuous, flow‐aligned scour holes in the wheel ruts where the track crossed grassed sandy swales. Although the site was burnt again during the next dry season, the scour holes did not coalesce during the second wet season, which was wetter than the previous one, because infrequent traffic bypassed the eroded section allowing grass to re‐establish. Scour holes on vehicle tracks in the Kakadu region are an intermediate but reversible stage in the development of gullies in grassed swales. Treatment of scour holes by soil conservation works may prevent gully formation.
Keywords:gully initiation  scour holes  root and algal mat  grass cover  fire  bulk density
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