Geological controls on submarine groundwater discharge in Long Bay,South Carolina (USA)     

Richard Viso  Clay McCoy  Paul Gayes  Dimitri Quafisi 《Continental Shelf Research》2010,30(3-4):335-341

A combination of geophysical methods including continuous electrical resistivity and high-resolution Chirp sub-bottom profiling were utilized to characterize geologic controls on pore fluid salinity in the nearshore of Long Bay, SC. Resistivity values ranged from less than 1 Ω m to greater than 40 Ω m throughout the bay. Areas of elevated electrical resistivity suggest the influence of relatively fresher water on pore water composition. Geophysical evidence alone does not eliminate all ambiguity associated with lithological and porosity variations that may also contribute to electrical structure of shallow marine sediments. The anomalous field is of sufficient magnitude that lithological variation alone does not control the spatial distribution of elevated electrical resistivity zones. Geographical distribution of electrical anomalies and structures interpreted from nearby sub-bottom profiles indicates abrupt changes in shallow geologic units control preferential pathways for discharge of fresh water into the marine environment. Shore parallel resistivity profiles show dramatic decreases in magnitude with increasing distance from shore, suggesting a significant portion of the terrestrially driven fresh SGD in Long Bay is occurring via the surficial aquifer within a few hundred meters of shore.  相似文献   

Man as geological agent     

Tony Waltham  & Alan Forster 《Geology Today》1999,15(6):217-220

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Evidence for the detection of gamma-rays up to 150 TeV from the active galaxy centaurus A     

R. W. Clay  B. R. Dawson  R. Meyhandan 《Astroparticle Physics》1994,2(4):347-352

Evidence is presented for the observation of UHE gamma-rays from the direction of the active galaxy Centaurus A (NGC 5128). An excess of events from this direction is detected only for energies below the expected cosmic microwave background induced cut-off at around 150 TeV.  相似文献   

Black holes in 4 nearby radio galaxies     

Jeremy Mould  Tony Readhead  Garret Cotter  David Batt  Mark Durré 《Astrophysics and Space Science》2015,356(2):347-351

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Crystal Geyser – Utah's cold one     

Tony Waltham 《Geology Today》2001,17(1):22-24

A cold geyser appears to be a contradiction in terms. But a combination of carbon dioxide, effervescing groundwater and a fortuitous oil exploration well can create a very spectacular water fountain.  相似文献   

Spectroscopic follow-up of a cluster candidate at z= 1.45     

Caroline van Breukelen  Garret Cotter  Steve Rawlings  Tony Readhead  David Bonfield  Lee Clewley  Rob Ivison  Matt Jarvis  Chris Simpson  Mike Watson 《Monthly notices of the Royal Astronomical Society》2007,382(3):971-984

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Resources of discontent     

Tony Loftas 《Marine Policy》1978,2(1):2

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The dynamics of a high-speed Jovian jet     

Tony Maxworthy 《Planetary and Space Science》1984,32(8):1053-1058

We present new measurements of the velocity field in the neighborhood of the high-speed jet located at approx. 24° N latitude in the Jovian atmosphere. The maximum zonal velocity is found to be 182 ± 10 m s^?1 located at 23.7 ±0.2° N and representing the largest velocity measured on the planet. The distinctive cloud markings found close to this latitude are discussed and possible dynamical consequences presented.  相似文献   

Law of the sea: neglected issues     

Tony Loftas 《Marine Policy》1979,3(3):243-245

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Sources and sinks of nutrients in a New Zealand hill pasture catchment I. Stormflow generation     

James G. Cooke  Tony Dons 《水文研究》1988,2(2):109-122

The processes of stormflow generation were studied in a hill pasture catchment near Hamilton, New Zealand. Although rainfall was relatively evenly distributed throughout the year, stormflow was highly seasonal and over 65 per cent occurred during the winter. Three main processes contributing to stormflow were identified which could be related to soil type and physiographic position. On gleyed soils derived from rhyolitic colluvium, saturation overland flow was the dominant process. Hydrographs from ‘Whipkey’ throughflow troughs also indicated that there was a subsurface response (saturated wedge) from this soil type. On steeper convex slopes, more permeable soils were derived from weathered greywacke. The presence of ephemeral springs on the hillslopes and direct observation during storm events indicated that storm runoff was generated as return flow from this soil. It was noted that nitrate concentrations from subsurface sources were 5–10 times higher than surface runoff. This difference in concentration was utilized in a chemical mixing equation which partitioned stormflow sources. This was compared with the stormflow predicted from rain falling on to saturated areas. There was good agreement between the two models for winter-spring events with respect to the volumes of surface runoff predicted, however the saturated areas model underestimated total stormflow. The results of the study are briefly discussed in terms of the potential for water quality management.  相似文献