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Bruce W.MELVILLE 《国际泥沙研究》2002,17(4)
The authors present new measurements of maximum (equilibrium) local scour depth at bridge abutments, the new data being analysed in terms of the multiplying factors given in Melville (1992,1997) and Melville and Coleman (2000). The design method presented in these publications is referred to here as the University of Auckland (UoA) Method. The authors' data apply to the following factors:∏f (flow intensity), ∏θ (abutment alignment) and ∏g (approach channel geometry). 相似文献
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J. Klerkx S. Deutsch J. Hertogen J. De Winter R. Gijbels H. Pichler 《Earth and Planetary Science Letters》1974,23(3):297-303
Sr-isotopic measurements were performed on samples of each main stage of eruption of the various Eolian islands, coupled with REE and Rb, Sr, U, Th, Hf and Sc determinations.A subcrustal origin is invoked for the older calc-alkaline series related to the subduction zone of the Eolian arc confirming the view of Barberi et al. (1974). A different explanation is given for the shoshonitic association which shows higher87Sr/86Sr values and different REE concentrations, making a direct derivation from the mantle doubtful. Contamination by crustal material or anatexis of the lower crust are considered as possible mechanisms. Finally the significance of a shoshonitic series is questionned. 相似文献
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