The Ocean Basins and Margins: Volume 6 The Indian Ocean,A. E. M. Nairn and F. G. Stehli (Eds). Plenum Press,New York, 1982. No. of pages: 775. Price: US$85.00     

N. H. Kenyon 《Geological Journal》1983,18(4):361-361

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Temporal Variations in the Second-Degree Stokes Tesseral Geopotential Coefficients from Topex/Poseidon Altimetry   总被引：1，自引：0，他引：1  

Burša  Milan  Kenyon  Steve  Kouba  Jan  Ŝíma  Zdislav  Vatrt  Viliam  Vítek  Vojtêch  Vojtíŝková  Marie 《Earth, Moon, and Planets》2003,93(1):37-64

The TOPEX/POSEIDON (T/P) altimetry data set covering the periodof January 1, 1993 to January 3, 2001 was used to derive monthlyseries of the second-degree tesseral geopotential coefficients.To account for the sea water temperature variations, rathersimple models have been devised and discussed, describinglocalized as well as areal variations of sea water temperatureand heights. The second-degree tesseral coefficients have alsobeen shown to be proportional to the pressureportions of the oceanic equatorial effective excitation functions,used in Ocean Angular Momentum (OAM) data. OAM datatogether with Atmospheric Angular Momentum (AAM) data canbe used to study observed polar motion (PM) series.The excess PM rates, derived from the T/P effective excitationfunctions, were compared to the corresponding observed PM rates,derived from the International Earth Rotation Service (IERS)Bulletin A and corrected with AAM also obtainedfrom IERS. The noise of the T/P derived PM rate series was foundto be significantly larger than the corresponding Bulletin A/AAMPM rate residuals as well as the PM rates derived from anindependent OAM series that was also available for the1993–2000 period.  相似文献   

Planet formation around M-dwarfs: the moving snow line and super-Earths     

Grant M. Kennedy  Scott J. Kenyon  Benjamin C. Bromley 《Astrophysics and Space Science》2007,311(1-3):9-13

Planets result from a series of processes within a circumstellar disk. Evidence comes from the near planar orbits in the Solar System and other planetary systems, observations of newly formed disks around young stars, and debris disks around main-sequence stars. As planet-hunting techniques improve, we approach the ability to detect systems like the Solar System, and place ourselves in context with planetary systems in general. Along the way, new classes of planets with unexpected characteristics are discovered. One of the most recent classes contains super Earth-mass planets orbiting a few AU from low-mass stars. In this contribution, we outline a semi-analytic model for planet formation during the pre-main sequence contraction phase of a low-mass star. As the star contracts, the “snow line”, which separates regions of rocky planet formation from regions of icy planet formation, moves inward. This process enables rapid formation of icy protoplanets that collide and merge into super-Earths before the star reaches the main sequence. The masses and orbits of these super-Earths are consistent with super-Earths detected in recent microlensing experiments.  相似文献   

Erosional and depositional patterns in the Valencia Channel mouth: An example of a modern channel-lobe transition zone   总被引：1，自引：0，他引：1  

A. Palanques  N. H. Kenyon  B. Alonso  A. Limonov 《Marine Geophysical Researches》1995,17(6):503-517

Recent deep-towed, high resolution sidescan sonar records and seismic profiles have been collected on the lower Valencia Fan (Northwestern Mediterranean). Three morphological zones, channelled, transition and unchannelled, have been recognized in the Valencia Channel mouth. Sonographs from the transition zone show a progresive transversal gradation from depositional to erosional bedforms. This asymmetry may be due to the lateral inputs of sediment flows from the Rhone deep-sea fan and to the effect of the Coriolis force, which could have diverted the flows to the southwest. Bedforms recorded in the study area include trains of starved ripples and dunes, sand ribbons, and fields of elongated scours. Most morphological features, bedforms and seismic characteristics of the Valencia Channel mouth are typical of channel-lobe transition zones.  相似文献   

The western part of the Gulf of Cadiz: contour currents and turbidity currents interactions   总被引：2，自引：0，他引：2  

T. Mulder  P. Lecroart  V. Hanquiez  E. Marches  E. Gonthier  J.-C. Guedes  E. Thiébot  B. Jaaidi  N. Kenyon  M. Voisset  C. Perez  M. Sayago  Y. Fuchey  S. Bujan 《Geo-Marine Letters》2006,26(1):31-41

Recent multibeam bathymetry and acoustic imagery data provide a new understanding of the morphology of the western part of the Gulf of Cadiz. The gulf is under the influence of a strong current, the Mediterranean Outflow Water (MOW). This current is at the origin of the construction of the giant Contourite Depositional System. Canyons and valleys with erosive flanks are observed. Only the Portimao Canyon is presently connected to the continental shelf. Channels occur on the continental shelf but are presently disconnected from the deeper network of channels and valleys. Slumps are localized in steep slope areas. They are caused by oversteepening and overloading, sometimes probably associated with earthquake activity. Slumps transform sharply into turbidity currents, depositing turbidites on the floor of deep valleys. Interaction of the MOW and gravity currents is suggested by the filling of the incisions located on the drifts below the present seafloor, the shifting of valleys and canyons in the direction of the MOW flow inducing an unusual phenomenon of capture of submarine valleys.  相似文献   

Why a corrugated coast only influences a longshore current within a wave length of the coast     

Kern E. Kenyon 《Journal of Oceanography》1987,43(2):135-138

An inviscid zone of influence is postulated from a physical model to occur when a steady homogeneous fluid flows by a two-dimensional corrugated wall with small slopes. The thickness of the influence zone is calculated to be a constant times the wave length of the wall. The method used involves balancing pressure differences between extreme points along the wall and between the wall and the outer edge of the influence zone but does not involve the irrotational assumption. An influence zone forms because the curvature of the boundary induces cross-stream accelerations and pressure gradients in the fluid. The result for the thickness of the influence zone agrees qualitatively with the exponential decay scale of an available potential flow solution to a similar problem, which suggests that the influence zone may occur in some rotational (as well as irrotational) flows.  相似文献   

The Gulf of Cadiz: an unstable giant contouritic levee   总被引：1，自引：0，他引：1  

T. Mulder  M. Voisset  P. Lecroart  E. Le Drezen  E. Gonthier  V. Hanquiez  J.-C. Faugères  E. Habgood  F. J. Hernandez-Molina  F. Estrada  E. Llave-Barranco  D. Poirier  C. Gorini  Y. Fuchey  A. Voelker  P. Freitas  F. Lobo Sanchez  L. M. Fernandez  N. H. Kenyon  J. Morel 《Geo-Marine Letters》2003,23(1):7-18

Recent multibeam bathymetry and acoustic imagery data provide a new understanding of the sedimentary system located in the Gulf of Cadiz which is under the influence of a strong current, the Mediterranean Outflow Water (MOW). When it comes out from the Strait of Gibraltar, the MOW is either channelled along major or secondary channels, or spills over a sedimentary levee. Frequent earthquakes and the constant current shearing generate widespread sediment deformation and instability of contourite deposits. Secondary channels can form by retrogression following an initial failure. At their mouth, sediment accumulates in the form of small sandy contourite lobes. These observations suggest that the Gulf of Cadiz system shares many similarities with channel–levee complexes formed by turbidity current activity. The main difference is that, in the Gulf of Cadiz, the main process is a strongly flowing saline current which locally interacts with gravity processes.  相似文献   

Community cooperation with natural flood management: a case study in the Scottish Borders   总被引：1，自引：0，他引：1  

Olivia Ruth Howgate  Wendy Kenyon 《Area》2009,41(3):329-340

The cooperation of communities and landowners in the upper catchment is vital for the successful implementation of natural flood management (NFM) projects as few incentives are in place to reward them to host such projects. The aim of this paper is to initiate an exploration of the issues that affect a community's decision to cooperate. The results of a case study in Scotland show that willingness to cooperate is affected by concern about alternative flood management techniques, a sense of responsibility to help connected communities at risk of flooding and the expectation of beneficial impacts from the project. Indeed, these issues appeared to over-ride the hostility generated towards the project as a result of poor communication and engagement with the community from organisations associated with the proposed project. The results of the research suggest that if NFM projects are to proliferate, close attention must be paid to community attitudes towards flood management and related communities at risk, and that NFM projects must be developed and implemented according to well-established principles of public participation.  相似文献   

Transforming management of tropical coastal seas to cope with challenges of the 21st century     

Peter F. Sale  Tundi Agardy  Cameron H. Ainsworth  Blake E. Feist  Johann D. Bell  Patrick Christie  Ove Hoegh-Guldberg  Peter J. Mumby  David A. Feary  Megan I. Saunders  Tim M. Daw  Simon J. Foale  Phillip S. Levin  Kenyon C. Lindeman  Kai Lorenzen  Robert S. Pomeroy  Edward H. Allison  R.H. Bradbury  Jennifer Corrin  Alasdair J. Edwards  David O. Obura  Yvonne J. Sadovy de Mitcheson  Melita A. Samoilys  Charles R.C. Sheppard 《Marine pollution bulletin》2014

Over 1.3 billion people live on tropical coasts, primarily in developing countries. Many depend on adjacent coastal seas for food, and livelihoods. We show how trends in demography and in several local and global anthropogenic stressors are progressively degrading capacity of coastal waters to sustain these people. Far more effective approaches to environmental management are needed if the loss in provision of ecosystem goods and services is to be stemmed. We propose expanded use of marine spatial planning as a framework for more effective, pragmatic management based on ocean zones to accommodate conflicting uses. This would force the holistic, regional-scale reconciliation of food security, livelihoods, and conservation that is needed. Transforming how countries manage coastal resources will require major change in policy and politics, implemented with sufficient flexibility to accommodate societal variations. Achieving this change is a major challenge – one that affects the lives of one fifth of humanity.  相似文献   

Disks in pre-main sequence stars     

Scott Kenyon 《Astrophysics and Space Science》1995,223(1-2):3-13

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