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排序方式: 共有236条查询结果,搜索用时 375 毫秒
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Climatic Change - We exploit the multi-model ensemble produced by phase 5 of the Coupled Model Intercomparison Project (CMIP5) to synthesize current understanding of external forcing of Sahel... 相似文献
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Morphologic variability of exposed mass-transport deposits on the eastern slope of Gela Basin (Sicily channel) 总被引:1,自引:0,他引:1
Daniel Minisini§ Fabio Trincardi Alessandra Asioli† Marcello Canu‡ Federica Foglini 《Basin Research》2007,19(2):217-240
The NE portion of Gela Basin in the Sicily Channel is affected by multiple slope failures originated during the late‐Quaternary. Basin sequences show evidence of stacked acoustically transparent and/or chaotic units, characterized by irregular upper surfaces, interpreted as mass‐transport deposits. The seafloor morphology also shows evidence of both old, partially buried, as well as recent slide products. Two recent slides exposed at seafloor, only 6 km apart (Twin Slides), are similar in geomorphological parameters, age and multistage evolution. Multistage failure of Twin Slides evolved from mud flows, derived from the extensive failure of less consolidated post‐glacial units, to localized slides (second stage of failure) affecting older and more consolidated materials. Although Twin Slides are very close to each other and have similar runout and fall height, they produced very dissimilar organization of the displaced masses, likely reflecting the distinct source units affected by failures. Integrating geophysical, sedimentological, structural and palaeontological data, a detailed investigation was conducted to determine the size and internal geometry of this mass‐transport complex, to explain the differentiated product and to shed light on its predisposing factors, triggers and timing. 相似文献
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Spijker Jeroen Recaño Joaquín Martínez Sandra Carioli Alessandra 《Journal of Geographical Systems》2021,23(2):161-207
Journal of Geographical Systems - Colombia is undergoing major changes in mortality patterns. National- and department-level cause-specific analyses have previously been carried out, but very... 相似文献
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Vladislav V. Sidorenko Alessandra Celletti 《Celestial Mechanics and Dynamical Astronomy》2010,107(1-2):209-231
This paper is devoted to the dynamics in a central gravity field of two point masses connected by a massless tether (the so called “spring–mass” model of tethered satellite systems). Only the motions with straight strained tether are studied, while the case of “slack” tether is not considered. It is assumed that the distance between the point masses is substantially smaller than the distance between the system’s center of mass and the field center. This assumption allows us to treat the motion of the center of mass as an unperturbed Keplerian one, so to focus our study on attitude dynamics. A particular attention is given to the family of planar periodic motions in which the center of mass moves on an elliptic orbit, and the point masses never leave the orbital plane. If the eccentricity tends to zero, the corresponding family admits as a limit case the relative equilibrium in which the tether is elongated along the line joining the center of mass with the field center. We study the bifurcations and the stability of these planar periodic motions with respect to in-plane and out-of-plane perturbations. Our results show that the stable motions take place if the eccentricity of the orbit is sufficiently small. 相似文献
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Tsunami vulnerability assessment of Casablanca-Morocco using numerical modelling and GIS tools 总被引:1,自引:0,他引:1
R. Omira M. A. Baptista J. M. Miranda E. Toto C. Catita J. Catalão 《Natural Hazards》2010,54(1):75-95
Earthquakes and tsunamis along Morocco’s coasts have been reported since historical times. The threat posed by tsunamis must
be included in coastal risk studies. This study focuses on the tsunami impact and vulnerability assessment of the Casablanca
harbour and surrounding area using a combination of tsunami inundation numerical modelling, field survey data and geographic
information system. The tsunami scenario used here is compatible with the 1755 Lisbon event that we considered to be the worst
case tsunami scenario. Hydrodynamic modelling was performed with an adapted version of the Cornell Multigrid Coupled Tsunami
Model from Cornell University. The simulation covers the eastern domain of the Azores-Gibraltar fracture zone corresponding
to the largest tsunamigenic area in the North Atlantic. The proposed vulnerability model attempts to provide an insight into
the tsunami vulnerability of building stock. Results in the form of a vulnerability map will be useful for decision makers
and local authorities in preventing the community resiliency for tsunami hazards. 相似文献
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Matúš Hyžný Carlos S. Melo Ricardo S. Ramalho Ricardo Cordeiro Patrícia Madeira Lara Baptista A. Cristina Rebelo Cynthia Gómez Alfred Uchman Markes E. Johnson Björn Berning Sérgio P. Ávila 《第四纪科学杂志》2021,36(1):91-109
The presence of decapod crustaceans in the Pliocene and Pleistocene (MIS 5e) fossil record of Santa Maria Island (Azores Archipelago) is herein reviewed. Our study raises the number of fossil decapods from this island from one species to 10 taxa (three for the Pliocene and seven for the Last Interglacial). Four of these 10 taxa are reported for the first time in the fossil record, worldwide. A new species of a mud shrimp is also described (Upogebia azorensis n. sp.). Our study suggests that the Plio–Pleistocene decapod assemblages of the Azores did not differ significantly from modern ones, being dominated by species that are today widespread across the Webbnesia ecoregion, the Mediterranean Sea, and the eastern Atlantic shores, including the Azores. As far as can be judged from the limited fossil record, apparently no tropical crab species with a Cabo Verdean/Senegalese provenance reached the Azores during windows of opportunity associated with Glacial Termination 2 or with the initial setting of the Last Interglacial period. This contribution increases the total number of marine taxa reported for the Pliocene and Pleistocene outcrops of Santa Maria Island to 218 and 155, respectively, highlighting the scientific relevance of its palaeontological heritage. 相似文献
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