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Bedrock-Sculpturing By Tsunami, South Coast New South Wales, Australia, Edward A. Bryant, R. W. Young
Bedrock-Sculpturing By Tsunami, South Coast New South Wales, Australia, Edward A. Bryant, R. W. Young
Faculty of Science - Papers (Archive)
Bedrock-sculpturing resulting in s-forms is associated with catastrophic flooding in near- and subglacial environments produced by flow velocities approximating 10 m s-1. These velocities can also be produced by extreme tsunami generated by submarine landslides or comet impacts with oceans. Repetitive tsunami events during the late Holocene have overwashed headlands along the New South Wales south coast and produced two suites of bedrock-sculptured terrain. At the smaller scale, s-forms similar to muschelbrüche, v-shaped grooves and sichelwannen have developed on upslopes while broad potholes, flutes and transverse troughs have formed on headland crests. Cavitation features consisting of sinuous grooves, impact marks, …
Catastrophic Wave (Tsunami?) Transport Of Boulders In Southern New South Wales, Australia, R. W. Young, Edward A. Bryant, D. M. Price
Catastrophic Wave (Tsunami?) Transport Of Boulders In Southern New South Wales, Australia, R. W. Young, Edward A. Bryant, D. M. Price
Faculty of Science - Papers (Archive)
Deposits of large boulders above modern limits of storm waves along the coast of southern New South Wales record catastrophic wave action. The largest boulders that were moved weigh 80-90 tonnes, and the maximum height of wave action was 32 m. Hydraulic reconstruction indicates flow depths of 3.4 and perhaps > 4 m and velocities of 5.5 m/s to 10.3 m/s. Cavitation features on some rock surfaces support the estimates of maximum velocities. A remarkably limited range in the orientation of imbricated boulders along 150 km indicates that the deposits record a single event that approached from the SE. to SSE. …