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- Title
Drainage derangement at Howitzer Hill in the Trowutta-Sumac Karst, north-west Tasmania.
- Authors
Slee, Adrian; McIntosh, Peter
- Abstract
The Trowutta-Sumac karst is the most extensively karstified dolomite terrain in northwest Tasmania. Here, exposed surface dolomite karst covers an area of more than 140 km2 within a triangularshaped 380 km2 region. In the region Precambrian dolostone units of the Black River Group crop out either as extensive hills or as karst pockets and interstratal karst lying adjacent to or beneath Cambrian and Tertiary volcanic rocks. To date studies on this karst system have been limited, except for those around well-known locations. Elsewhere hundreds of sinkholes pockmark the region; in some locations they form complex polygonal karst terrain. The subsurface hydrology of the area is unknown. Although karst stream sinks and small cave systems have been located, the abundance of sinkholes indicates that regional karst aquifers may exist, but stream resurgences are rare and those that have been documented are associated with small meander cut-off caves on large streams with clear direct surface connections between stream sinks and resurgences, notably at Julius River and Lamprey Creek. Recent field investigations by the authors have documented an intensely karstified area in the eastern Howitzer Creek catchment north of the Arthur River. Here, the informally named Howitzer Hill presents a complex polygonal karst landscape associated with karstic subsurface flow. This study describes the Howitzer Hill karst, the landforms present, dye tracing methodology and results obtained.
- Subjects
TASMANIA; KARST; HOWITZERS; VOLCANIC ash, tuff, etc.; DRAINAGE; FIELD research
- Publication
Helictite: Journal of Australasian Speleological Research, 2022, Vol 47, p13
- ISSN
0017-9973
- Publication type
Article