knickpoint. evident in the 25 years since Subsequent heavy rainfall during 1978 led impacts occurred. to gully erosion. The bursting of the small dam and dry swamp sediments (as a result of subsidence) are thought to have enhanced this erosion (Young 1982). 18 Extensive Subsidence Longwall mining beneath swamp between No baseline monitoring No known Gully still exists. gullying and related 1995 and 1997. data prior to mining remediation. Some vegetation (Native Dog erosion. impacts are has regenerated. Creek, Avon Consultant Biosis noticed cracking of Subsequent studies and likely to have Catchment) Severely swamp sediment, desiccated vegetation monitoring following Native Dog Creek made the burnt in 2001 and loss of water from pools in 2001 impacts. Most studies still ceases to flow swamp more bushfires. (Harrington 2001). recognise that natural during low flow susceptible erosion was occurring conditions. The 2001 bushfires severely the to burning prior to mining (EarthTech swamp to its peat layer indicating swamp and erosion. 2003 and Tompkins & sediments were dry prior to burning Humphreys 2006). (Tompkins & Humphreys 2006). However, the rate of Major erosion gully discovered in 2002 erosion was enhanced following a series of storm events. following the bushfires Evidence found that bedrock beneath the (Tompkins & Humphreys swamp had cracked and water had drained 2006). to within the bedrock layer (Gibbins 2003). Swamp 19 Cracking of Subsidence Longwall mining history similar to 18. No baseline monitoring No known Gully still exists. exposed has data prior to mining. remediation. Some vegetation (Native Dog The 2001 bushfires severely burnt the bedrock in increased the has regenerated; Creek, Avon swamp. Assessment of by centre of gradient of however, Catchment) mining consultants Longwall mining has locally increased the swamp. the swamp. It moisture levels in (EarthTech 2003) did not
knickpoint. Subsequent heavy rainfall during 1978 led to gully erosion. The bursting of the small dam and dry swamp sediments (as a result of subsidence) are thought to have enhanced this erosion (Young 1982). evident in the 25 years since impacts occurred. 18 (Native Dog Creek, Avon Catchment) Extensive gullying and erosion. Severely burnt in 2001 bushfires. Subsidence related impacts are likely to have made the swamp more susceptible to burning and erosion. Longwall mining beneath swamp between 1995 and 1997. Consultant Biosis noticed cracking of swamp sediment, desiccated vegetation and loss of water from pools in 2001 (Harrington 2001). The 2001 bushfires severely the swamp to its peat layer indicating swamp sediments were dry prior to burning (Tompkins & Humphreys 2006). Major erosion gully discovered in 2002 following a series of storm events. Evidence found that bedrock beneath the swamp had cracked and water had drained to within the bedrock layer (Gibbins 2003). No baseline monitoring data prior to mining Subsequent studies and monitoring following impacts. Most studies recognise that natural erosion was occurring prior to mining (EarthTech 2003 and Tompkins & Humphreys 2006). However, the rate of erosion was enhanced following the bushfires (Tompkins & Humphreys 2006). No known remediation. Gully still exists. Some vegetation has regenerated. Native Dog Creek still ceases to flow during low flow conditions. Swamp 19 (Native Dog Creek, Avon Catchment) Cracking of exposed bedrock in centre of swamp. Subsidence has increased the gradient of the swamp. It Longwall mining history similar to 18. The 2001 bushfires severely burnt the swamp. Longwall mining has locally increased the No baseline monitoring data prior to mining. Assessment of by mining consultants (EarthTech 2003) did not No known remediation. Gully still exists. Some vegetation has regenerated; however, moisture levels in
peat-swamp-subsidence.docx