Browsing by Author "Bendun, EOK"

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    Detailed meteorological interpretation of acoustic sounder records.
    (Australian Atomic Energy Commission, 1981-02) Clark, GH; Bendun, EOK
    To quantify further the facsimile records from a monostatic acoustic sounder, a series of balloon and near surface meteorological measurements were made in the lower atmosphere under maritime conditions. Tests were concentrated on echo patterns associated with the developing atmospheric mixing layer and arrival of the sea breeze. Similar comparisons where made with an acoustic sounder operating at an inland location with continental climatic conditions. Extrapolation techniques were used to estimate the mixing layer depth between sunrise and initial emergence of the rising echo on the facsimile record. There was reasonable agreement in absolute height and rate of rise of the layer from comparison of the balloon and acoustic sounder measurements. The simple Carson model [D.J. Carson [1973] Q.J.R. Meterol. Soc., 99:450-467] was also tested to allow extrapolation beyond disappearance of the rising echo. Under sea breeze conditions, the low altitude, elevated echo was associated with a stable temperature profile, a decrease in wind speeds and, frequently, a vertical shear in wind direction to the overlying background flow.
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    Meteorological and radiation measurements at Nabarlek, Northern Territory, June to July 1979
    (Australian Atomic Energy Commission, 1981-09) Clark, GH; Davy, DR; Bendun, EOK; O'Brien, BG
    A meteorological and radiation measurement program was conducted near the then developing uranium mine at Nabarlek in the Northern Territory. The two-filter tube radiation measuring technique was checked and compared with the continuous radon monitor and instant working level meter techniques. In general the Nabarlek meteorology was characterised by weak stable layers and good ventilation conditions with winds rarely less than 1ms -1. A comparison of wind measurements made near the open pit with those taken some 800 m away gave evidence of horizontal changes in the wind field over the site. Strong daytime winds gusting higher than 10 ms -1 caused a visible suspension of dust from the site. Dust deposition samples indicated that thorium-230 in air on site was a factor of twelve below the maximum permissible concentration for employees in Australia but uranium was lower by several orders of magnitude. The concentrations of radioactivity in the aquatic food pathway external radiation levels and radon daughter concentrations from deposited dust were likewise at least two orders of magnitude below the maximum concentrations permissible in Australia.
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    Meteorological research studies at Jervis Bay, Australia.
    (Australian Atomic Energy Commission, 1974-07) Clark, GH; Bendun, EOK
    A climatological study of the winds and temperatures from the Jervis Bay region which commenced in October 1970 has shown the presence of a coastal sea breeze and secondary bay breeze circulation system. In an attempt to define the influence of the Murray's Beach site on the local atmospheric dispersion, special smoke plume photography studies were conducted in the lower atmosphere. In June 1972 a meteorological acoustic sounding research programme was initiated at the Jervis Bay settlement. The aims of the research are to calibrate the sounder in terms of surface wind, turbulence and temperature measurements pertinent to a description of the lower atmospheric dispersion potential. Preliminary results on six months' data have shown encouraging correlations between the acoustic sounder patterns and particularly the wind direction turbulence traces.
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    Selected climatological data from Lucas Heights 1958-1966
    (Australian Atomic Energy Commission, 1968-04) Charash, E; Bendun, EOK
    Routine meteorological observations at Lucas Heights during the years 1958 to 1966 are summarized and presented according to standard meteorological practice. Temperatures and pressure variations are given in the form of averages, extremes and frequency distributions for each season. Surface winds are shown on wind roses. Totals and/or averages of rainfall, days with rain, cloudiness and evaporation for each month are included. Some special meteorological data, such as observations of sea breezes and inversions, are also presented.