Social and Behavioral Sciences Commons^™

Geochemical Comparisons Between Estuaries With Non-Industrialised And Industrialised Catchments: The Huon And Derwent River Estuaries, Tasmania, Brian Jones, Bryan Chenhall, F Debretsion, Adrian Hutton

B. G. Jones

The adjacent Huon and Derwent estuaries in Tasmania have similar climatic and physical characteristics, and provide a good comparison between relatively uncontaminated and industrially polluted estuaries, respectively. Representative samples were collected from both estuaries and analysed for grainsize and trace‐element content (using X‐ray fluorescence and neutron activation analyses). The Huon estuary drains a predominantly forested and agricultural catchment and contains low (baseline) concentrations of trace elements, including lead, zinc and copper. In contrast, the Derwent estuary has a geologically similar yet larger catchment and it passes through an industrialised area in the midestuarine reach. A zinc refinery has, in the …

Lowland River Responses To Intraplate Tectonism And Climate Forcing Quantified With Luminescence And Cosmogenic 10be, J D. Jansen, G C. Nanson, T J. Cohen, T Fujioka, D Fabel, J R. Larsen, A T. Codilean, D M. Price, H H. Bowman, J.-H May, L A. Gliganic

Faculty of Science, Medicine and Health - Papers: part A

Intraplate tectonism has produced large-scale folding that steers regional drainage systems, such as the 1600 km-long Cooper Ck, en route to Australia's continental depocentre at Lake Eyre. We apply cosmogenic 10Be exposure dating in bedrock, and luminescence dating in sediment, to quantify the erosional and depositional response of Cooper Ck where it incises the rising Innamincka Dome. The detachment of bedrock joint-blocks during extreme floods governs the minimum rate of incision (17.4±6.5 mm/ky) estimated using a numerical model of episodic erosion calibrated with our 10Be measurements. The last big-flood phase occurred no earlier than ∼112–121 ka. Upstream of the Innamincka …

Holocene Environmental Changes In Central Inner Mongolia Revealed By Luminescence Dating Of Sediments From The Sala Us River Valley, Sheng-Hua Li, Jimin Sun, Bo Li

Faculty of Science, Medicine and Health - Papers: part A

Luminescence dating of the fluvial and lacustrine sediments from the Sala Us River valley at the south edge of the Mu Us Desert, central Inner Mongolia, is reported. The study region lies in the northwestern marginal zone of the east Asian summer monsoon and is sensitive to climate change. The dating results combined with environmental proxies indicate that the Holocene Climate Optimum period, took place from 8.5 to 5 ka ago and was marked by lake development. After ~5 ka ago, the region became arid, as inferred from lake regression and fluvial activity. Deposition of fluvial sediments lasted from ~5 …

Comparative Records Of Occupation In The Keep River Region Of The Eastern Kimberley, Northwestern Australia, Ingrid Ward

Faculty of Science, Medicine and Health - Papers: part A

This paper considers the record of occupation in the Keep River region of the eastern Kimberley, and whether archaeological records are equally preserved within as well as between regions. Luminescence dating, radiocarbon dating and archaeological evidence from eight rock shelter sequences provide only late Holocene (5 - 0 ky BP) occupation sequences, whereas luminescence dating and archaeological evidence for three sand-sheet sequences indicate occupation dating to 18 ky BP. Given that rock shelters and sand sheet excavations can produce such different chronologies, it is questioned to what extent the representative records for the eastern Kimberley, and the adjacent western Kimberley, …

Minimum Energy As The General Form Of Critical Flow And Maximum Flow Efficiency And For Explaining Variations In River Channel Pattern, He Qing Huang, Howard H. Chang, Gerald Nanson

Faculty of Science, Medicine and Health - Papers: part A

Although the Bélanger-Böss theorem of critical flow has been widely applied in open channel hydraulics, it was derived from the laws governing ideal frictionless flow. This study explores a more general expression of this theorem and examines its applicability to flow with friction and sediment transport. It demonstrates that the theorem can be more generally presented as the principle of minimum energy (PME), with maximum efficiency of energy use and minimum friction or minimum energy dissipation as its equivalents. Critical flow depth under frictionless conditions, the best hydraulic section where friction is introduced, and the most efficient alluvial channel geometry …

Maine Nonpoint Source Pollution Assessment Report, Bureau Of Water Quality Control

Maine Collection

Maine Nonpoint Source Pollution Assessment Report

Prepared by the Maine Department of Environmental Protection, Bureau of Water Quality Control, Augusta, Maine 1989.

Contents: Executive Summary / Introduction / Methodology / Statewide Water Quality Summary / State And Local Agency Programs for Control of Nonpoint Source Pollution / Process for Identification of Best Management Practices and Associated Standards / List of References / List of Figures / List of Tables