EQUILIBRIUM COASTAL PROFILES:Ⅱ. EVIDENCE FROM EOF ANALYSIS     

高抒 《中国海洋湖沼学报》1998,(3)

IamODUCTIoNInoIdertoestablishtheconceptofeqUilibriumforbeachprofiles,anuInberofproh-lemsmustbesolved,including:(i)pndoftheealstehceofeqUilibrium;(ii)definitionoftheshapeofaneqUilibriumcOaStalprofile;and(iii)evaluationofthePeriodoftimere-qUiredtoreachtheeqUilibritunstate(knownastheresPOnsetime).Forthefirstoftheseprohlems,areviewofpreviousinvestigationsandaSynhesisarepresentedelsewhere(GaoandCollins,1998).Accowhngtosuchtheoreticalconsidera-tions,threetwrsofeqUilibriurnInayoccurinnatllT…  相似文献   

地学科技论文文题与摘要的英文翻译讨论     

吕东芸 《中国煤田地质》2003,15(2):67-68,70

针对地学论文文题和摘要的英文翻译，以公开发行的期刊为例，探讨论文文题和摘要翻译时应该注意的相关问题。  相似文献   

Morphology and internal structure of sand shoals and sandbanks off the Dorset coast, English Channel   总被引：1，自引：0，他引：1  

Alex C. Bastos  Michael Collins  Neil H. Kenyon† 《Sedimentology》2003,50(6):1105-1122

The morphology and internal structure of sand shoals and sandbanks around a coastal headland (Portland Bill, southern UK) are described on the basis of sidescan sonar and high-resolution seismic data sets. Morphological and architectural evidence, combined with the spatial distribution and nature of the bedrock surface, indicates that the evolution of these deposits, especially the sandbanks, may not only be hydrodynamically controlled but also morphologically controlled. The internal structure of the sand shoals reveals a simple pattern of clinoforms dipping in the same direction as their steeper profile. In contrast, the internal structure of the sandbanks reveals that their lower seismic units consist of a sedimentary core interpreted as the remains of a lowstand deposit or an early stage of the bank development under different prevailing hydrodynamic conditions. The present morphology of the sandbanks is represented by upper seismic units characterized by large-scale sandwave foresets dipping at 6–8°. The nature and morphology of the bedrock surface may also influence the development of sandbanks in some cases. For example, to the west of Portland Bill, the morphology of the bedrock surface (basal reflector) restricts the development of the Portland Bank. This information may explain the asymmetric evolution of sandbanks around Portland Bill.  相似文献   

Communicating geomorphology through International English          下载免费PDF全文

John Lewin 《地球表面变化过程与地形》2017,42(1):157-165

International English has come to dominate science publication. For both first and second language speakers, the constraints of language for communication in geomorphology are reviewed, including uncertainties with terminology, subtleties of qualification and explanation in the written presentation of arguments, and formalities in the rhetorical structuring of published papers. Distinctive qualities of style and presentation need to be recognized because, in geomorphology as generally, full qualitative meanings may pass lingua franca or second language speakers by, whilst formulaic discourse may disguise shortcomings. The alternative of language simplification for international usage may not be wholly desirable if valued functions are lost. Language is also increasingly being coupled with visual devices, pictorial and diagrammatic images and data tables, which are internationally intelligible. These can leave viewers with greater hermeneutic (text interpretation) freedom, and therefore a variety of outcomes in understanding. Mathematical treatments, with their precision and predictive utility, have great universal value and they leave readers with rather less interpretive freedom. Debate is due, both by first and by second English language geomorphologists, as to how well developing presentation styles in international English suit scientific purposes. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Fish composition and assemblage structure in three Eastern English Channel macrotidal estuaries: A comparison with other French estuaries     

Jonathan Selleslagh  Rachid Amara  Pascal Laffargue  Sandric Lesourd  Mario Lepage  Michel Girardin 《Estuarine, Coastal and Shelf Science》2009

This study has analysed for the first time fish composition and assemblage structures of three small macrotidal estuaries of the Eastern English Channel (EEC) and has explored the influences of 19 biotic and abiotic variables on the fish assemblages. Fish from Canche, Authie and Somme estuaries were collected during spring (June 2006 and May 2007) and autumn (September 2006) along the estuarine gradients using a 1.5 m beam trawl. Using identical sampling protocols, the study also analysed and compared for the first time taxonomic and functional aspects of the fish assemblages in 15 estuaries located along the Atlantic and English Channel coasts. SIMPER analysis showed high similarities in fish assemblages in the three EEC estuaries and during either spring or autumn periods. However, intra-estuary similarities were relatively low, indicating that fish assemblage structures (species richnesses or abundances) were more variable within the estuary (salinity gradient) than between estuaries and/or seasons (spring vs autumn). Although numerous environmental variables were included in the study, only 47% of the variability observed in the fish distribution was explained. Fish spatial variations in the EEC estuaries are mostly driven by abiotic variables as opposed to biological interactions. As indicated by CCA, salinity and muddy sediments were the two most important factors structuring the fish assemblages. The macrobenthos being very abundant in the EEC estuaries (580–1121 ind. m⁻²), the availability of potential prey is probably not a limiting factor in the utilization of estuaries by fish. Contrary to the majority of French estuaries dominated by estuarine species (ES), the fish assemblages of the EEC estuaries are clearly dominated by marine migrant (MM) species (65% on average) with high abundance of juveniles (mostly young-of-the-year). Cluster and SIMPROF's analyses distinguished the functional structure of the 15 estuarine fish assemblages into different clusters. The three EEC estuaries form a similar group with the largest French estuaries (Seine, Loire and Gironde). The latters were characterized by higher MM/ES ratio compared to the other French estuaries. Freshwater flow and tidal range were the main factors associated with this group of estuaries. The results of the present study do not indicate that anthropogenic impacts (chemical contamination) on estuaries affect their ecological functioning as described by the fish ecological guilds. It is suggested that the guild approach may not be useful to provide valuable information on the ecological status of estuaries.  相似文献   

Physical and biological impact of marine aggregate extraction along the French coast of the Eastern English Channel: short- and long-term post-dredging restoration   总被引：12，自引：2，他引：12  

Desprez  Michel 《ICES Journal of Marine Science》2000,57(5):1428-1438

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试论英汉被动式的不对等性及不可互译性     

邰晓 《广东海洋大学学报》2007,27(5):98-101

从英汉被动式成立的条件、施事、语句衔接方式、特有句式和特殊用法以及认知背景等五个方面,分析了英汉被动式在不同语境中能在何种程度上实现对等互译,探讨了英汉被动式可对等互译或不可对等互译的深层原因。  相似文献   

Impact of amoco cadiz oil spill on the muddy fine sand Abra alba and Melinna palmata community from the Bay of Morlaix     

Jean-Claude Dauvin 《Estuarine, Coastal and Shelf Science》1982,14(5):517-531

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《建筑抗震设计规范》(GB50011-2001)中多阻尼比反应谱长周期区段的适用性     

陈勇  俞言祥 《中国地震》2007,23(2):131-140

在《建筑抗震设计规范》(GB50011-2001)中,反应谱在长周期区段出现了大阻尼比曲线值大于小阻尼比曲线值的反超现象。分析认为,《规范》的多阻尼比反应谱在3.39～6s的长周期区段可能不适用,而用虚拟等值点法修正后所得参数简单且易于使用。反超现象是因计算误差引起,还是因特定的物理背景造成,值得深究。  相似文献   

The grain-size characterisation of coastal sand from the Somme estuary to Belgium: Sediment sorting processes and mixing in a tide- and storm-dominated setting     

Edward J. Anthony  Arnaud Héquette 《Sedimentary Geology》2007,202(3):369-382

Sand-rich Holocene to modern clastic deposits in the eastern English Channel and the southern North Sea coasts of France and Belgium occur extensively as nearshore-sand bank, estuarine-tidal flat, aeolian dune and beach sub-environments. Sand samples (n = 665) collected from these deposits suggest the presence of three different populations: a largely dominant (83%) medium to fine quartz sand population (“b”), and finer- (14%) and coarser-grained (4%) populations (respectively “c” and “a”). The distribution of these populations among the four sub-environments reflects tide- and storm-dominated sorting and transport processes and a variable degree of mixing. These populations are derived from a mixture of very fine- to very coarse-grained fluvial, outwash and paraglacial sediments deposited on the beds of the eastern English Channel and southern North Sea during the late Pleistocene lowstand. The nearshore-sand bank environment, which also corresponds to the main offshore source area of the coastal deposits, exhibits population heterogeneity reflecting the variability of hydrodynamic conditions and sediment sorting in this zone. The nearshore topography of tidal ridges, banks and troughs in these tidal seas leads to variable bed and tide- and storm-induced shear stress conditions. These conditions only allow for the mobilisation and onshore transport of some of the finer fractions (populations “b” and “c”), leaving an offshore mixture of these finer populations with coarser, less mobilisable sediments (population “a”). Once in the coastal zone, these two finer populations undergo further hydrodynamic sorting and segregation. Variably sorted very fine sands to silts (population “c”) are trapped in the low-energy estuarine-tidal flat sub-environment, while the highly homogeneous population “b” is further sorted in aeolian dune and beach sub-environments. This sorting occurs via a coastal sand transport pathway linking the Somme estuary mouth to the southern North Sea bight where tidal range and wave energy decrease relative to the English Channel. Since this sand transport pathway enables longshore transport of hydrodynamically sorted medium to fine sand derived directly from the immediate nearshore zone, it has further contributed to a net flux of this sand population from the eastern English Channel sea bed to the southern North Sea.  相似文献