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| Registros recuperados: 165 | |
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| Carter, David L.; Bondurant, James A.. |
| The technology available for the control of sediments, nutrients, and adsorbed biocides in surface irrigation return flows has been reviewed and evaluated. Some of this technology could be applied immediately to reduce sediment and associated nutrient and biocide concentrations in surface irrigation return flows. Much of the available information needs to be integrated to develop improved control practices. New ideas and new control technology are needed. Economic incentive programs are needed to improve acceptance of control technology. The factors controlling erosion and subsequent sediment concentrations in surface irrigation return flows, and how these factors can be managed to reduce erosion and sediment concentrations are reviewed and... |
| Tipo: Technical Bulletin |
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous). |
| Ano: 1976 |
URL: http://eprints.nwisrl.ars.usda.gov/1115/1/378.pdf |
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| Allen, G.; D'Ozouville, Laurent; L'Yavanc, Jacky. |
| The Aber Benoît, a small estuary on the North West coast of Brittany was polluted by oil from the Amoco Cadiz oil spill. Preliminary results from water and sediment samples taken in the estuary in May 1978, show that two months after the initial spill, high concentrations of hydrocarbures existed in the water and sediments of the estuary. The Aber Benoît shows a well developed salt wedge and upstream increasing suspended sediment concentrations. Oil was dispersed more or less evenly throughout the water column, in the entire length of the estuary. In the bottom sediments, oil had accumulated to depths of 30 cm. Sand bars appear to induce a trapping of oil in the estuary channel. |
| Tipo: Text |
Palavras-chave: Estuaire; Sédiment; Pollution Hydrocarbures; Estuary; Sediment; Oil spill. |
| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/00306/41721/40932.pdf |
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| Chamroux, S.; Boucher, G.. |
| Chemical and Biological evolution of sediments in closed circuit : I. Nitrogen and bacteria. A series of well controlled sea water closed circuit sand filters allowed the study of chemical and biological regulation processes in the sediment. Bacteria, Nitrogen chemistry and meiofauna were mainly investigated. The evolution of the different forms of nitrogen is rather similar, whatever the organic matter flow in the sediment. As long as the amount of organic input works as limiting factor, bacteria densities are proportional to its flow. No correlation was found between bacteria and chemical parameters in the sand or in the water. The temperature does not seem to play a determinant part neither in the evolution of bacteria nor in the mineralization of... |
| Tipo: Text |
Palavras-chave: Circuit clos; Sédiment; Bactéries; Matière organique; Azote; Closed circuit; Sediment; Bacteria; Organic matter; Nitrogen. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00305/41652/40861.pdf |
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| Chamroux, S.; Boucher, G.. |
| The evolution of nitrogen content in experimental closed circuit ¿and filters was followed, each tank being fed with different quantities of soluble organic matter. According to the trophic conditions, two types of metabolism could be observed : - a loss of nitrogen (denitrification), reaching almost 90% of the nitrogen input in eutrophic conditions, and close to 35% in mesotrophic conditions. - a gain in nitrogen (fixation), a predominant metabolism in oligotrophic and eutrophic conditions. Nitrogen retention in the sediment increases slightly with the organic matter input, but no proportionality could be established. It seems that the sediment, by its bacterial metabolisms, regulates its own organic matter richness. |
| Tipo: Text |
Palavras-chave: Circuit clos; S; Bilan azoté; Closed circuit; Sediment; Nitrogen balance. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00305/41654/40863.pdf |
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| Registros recuperados: 165 | |
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