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The effects of short-term regulation releases from an impoundment on downstream fish fauna 总被引：2，自引：0，他引：2
Abstract. The short-term ecological effects of a simulated large-scale regulation release (360 106 1d-1 ), over a 5-day period, from an impoundment into the Afon Vyrnwy were investigated. A dramatic increase in the density and biomass of the fish fauna occurred at the time of the release. Elevated discharge rate was considered the primary factor responsible for the enhancement of the fauna. This increase in density and biomass of the fish fauna was suggested as being the result of fish displaced by tru-released water moving upstream to regain station after the flow had abated. Implications of these observations in the design of operating guidelines for use at regulating reservoirs are discussed. 相似文献
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DH Lowndes DB Geohegan AA Puretzky DP Norton CM Rouleau 《Science (New York, N.Y.)》1996,273(5277):898-903
Pulsed laser deposition (PLD) is a conceptually and experimentally simple yet highly versatile tool for thin-film and multilayer research. Its advantages for the film growth of oxides and other chemically complex materials include stoichiometric transfer, growth from an energetic beam, reactive deposition, and inherent simplicity for the growth of multilayered structures. With the use of PLD, artificially layered materials and metastable phases have been created and their properties varied by control of the layer thicknesses. In situ monitoring techniques have provided information about the role of energetic species in the formation of ultrahard phases and in the doping of semiconductors. Cluster-assembled nanocrystalline and composite films offer opportunities to control and produce new combinations of properties with PLD. 相似文献
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