RIVER BED DYNAMICS AND BED SEDIMENT TRANSPORTIN MOUNTAIN TORRENTS IN MOUNTAIN TORRENTS

LIN~DUCTIONTheinvenigationsofrivermorphologyandOfriverbeddebilityresultalwaysinidalsabouttheinterrelationshipbetweenthehydrauliccondihons,sc(hant~rtandbeddynndcs.ThedeCOuragingfactforsuchinveedgationsarethecomplexityoftheseSystemsandthehugenumberofimportantvariables.IfwefollowSimonsetal(1965)andall~eneeandtheconcentrationsofSUSPendedlOadandbedloadthefollowingparametersarethepnncapleVarialllesf-av~velocityofnow,diStributionofnowvelociticsacdeadofturbulence-meandepthacthedistributionofde…     

STABILITY ANALYSIS OF COFFERDAM SLUMP AND ITS APPLICATION IN THE CLOSURE OPERATION OF THREE GORGES PROJECT

I.INTRODUCTIONTheclosureoperationofThreeGorgesprojectisfamousintheworldforitslargedischarge,deepwater,lowvelocityinclosuregaps,largequantitiesandhighintensityforfillingmaterials.Thus,thedikeconstT'Uctionintheclosureoperationprocessisverydifficult.Sothedesign,researchandconstrUctiongroupshavepaidmuchenergyinthedesignprinciplesandoptimalitymeasuresofthegrandriverclosureoperation.FromtheexperimentsofhydraulicsanddikeslumpinthesecondperiodofclosureoperationattheResearchinstitUteofYangtZeR…     

A VERIFICATION ON DIVISION OF HYDROCLIMATIC AREA IN CHINA SEAS USING DIGITAL CHARACTERISTIC OF FREQUENCY DISTRIBUTION

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｅｄｉｖｉｓｉｏｎｏｆｈｙｄｒｏｃｌｉｍａｔｉｃａｒｅａ,ｈｏｗｔｏｓｅｌｅｃｔｔｈｅｐｒｉｎｃｉｐａｌｃｌｉｍａｔｉｃｆａｃｔｏｒｓｗｈｉｃｈｍａｙｉｎｆｌｕｅｎｃｅｔｈｅｄｉｓｔｒｉｂｕｔｉｏｎｏｆｈｙｄｒｏｃｌｉｍａｔｉｃｔｙｐｅｉｓａｎｉｍｐｏｒｔａｎｔｐｒｏｂｌｅｍｔｏｅｆｆｅｃｔｔｈｅｒｅｌｉａｂｉｌｉｔｙｏｆｔｈｅｒｅｓｕｌｔｏｆｄｉｖｉｓｉｏｎｏｆｈｙｄｒｏｃｌｉｍａｔｉｃａｒｅａ.Ｉｎｇｅｎｅｒａｌ,ｔｈｅｃｌｉｍａｔｉｃｃｈａｒａｃｔｅｒｉｓｔ…     

The Mark IV Nançay radioheliograph

A multi-frequency capability has been added to the north-south array of the Nançay Radioheliograph, providing observations at up to five frequencies between 150 and 450 MHz with time resolution 0.1 s. The projected position, brightness and dimension of sources in the solar corona can thus be studied as a function of height. Two-dimensional information is obtained at 164 MHz using the east-west and north-south arrays. In addition, the quiescent corona can be mapped in two dimensions at all observed frequencies by earth rotation synthesis. The paper describes the new aspects of the antennae, the receiver frontend, the data acquisition and the calibration procedure. The performances of the instrument are illustrated with multi-frequency observations of solar fast-drift bursts, continuum emission and maps of the quiet corona.Meudon: Y. Avignon, J. Bonmartin, A. Bouteille, B. Clavelier, E. Hulot, M. P. Issartel, A. Kerdraon, K.-L. Klein, P. Lantos, C. Mercier, M. Pick, A. Raoult, D. Rigaud, G. Trottet, N. Vilmer. Nançay: C. Chantelat, M. Chapuis, Y. Chapuis, A. Coffre, C. Couteret, B. Darchy, P. Guéniau, D. Lalardie, P. Picard, R. Tocqueville.     

个旧老厂矿田花岗岩地球化学特征及其形成构造背景

个旧老厂矿田是中国著名的铜锡多金属矿产地而倍受关注,本文以个旧老厂矿田花岗岩体为研究对象,结合岩体产出的地质条件,在岩石学研究的基础上,运用主量元素及微量元素地球化学方法对老厂花岗岩的地球化学特征、源区及其形成的构造背景进行了系统研究。结果表明,老厂花岗岩体为一复式岩体,来源于陆壳岩石的部分熔融,但其具有不同的源区性质。构造环境判别图显示,老厂花岗岩体不同单元形成于不同的构造环境,与成矿作用有关的花岗岩则主要形成于后碰撞造山向板内环境的转换阶段,这种特殊的构造环境是区内超大型矿床形成的有利条件。     

"现代地球磁场监测与地磁基本数据积累"项目成果介绍

本文详细介绍了“现代地球磁场监测与地磁基本数据积累”项目的立项背景、目标、所开展的主要工作、取得的成果、研究成果的社会效益和对该领域研究未来工作的展望。     

Learning styles among geography undergraduates: an international comparison

Growing diversity is focusing attention on the range of different student learning styles. This study assesses whether geographers have a predominant learning style and whether this varies between and within countries. The findings are based on over 900 geography students from 12 universities in Australia, New Zealand, the UK and the US, who completed Kolb's Learning Style Inventory (LSI). The implications for curriculum design and student learning strategies are discussed. It is suggested that departments should aim to produce balanced learners with a full range of learning capacities rather than simply matching teaching to existing learning styles.     

Orogenic structure of the Eastern Alps, Europe, from TRANSALP deep seismic reflection profiling

The TRANSALP Group, comprising of partner institutions from Italy, Austria and Germany, acquired data on a 340 km long deep seismic reflection line crossing the Eastern Alps between Munich and Venice. Although the field work was split into four campaigns, between fall 1998 and summer 2001, the project gathered for the first time a continuous profile across the Alps using consistent field acquisition and data processing parameters. These sections span the orogen itself, at its broadest width, as well as the editor Fred Davey and the two adjacent basins. Vibroseis and explosion data, complementary in their depth penetration and resolution characteristics, were obtained along with wide-angle and teleseismic data. The profile shows a bi-vergent asymmetric structure of the crust beneath the Alpine axis which reaches a maximum thickness of 55 km, and 80–100 km long transcrustal ramps, the southward dipping ‘Sub-Tauern-Ramp’ and the northward-dipping ‘Sub-Dolomites-Ramp’. Strongly reflective patterns of these ramps can be traced towards the north to the Inn Valley and towards the south to the Valsugana thrust belt, both of which show enhanced seismicity in the brittle upper crust. The seismic sections do not reveal any direct evidence for the presence of the Periadriatic Fault system, the presumed equivalent to the Insubric Line in the Western Alps. According to our new evolutionary model, the Sub-Tauern-Ramp is linked at depth with remnants of the subducted Penninic Ocean. The ‘crocodile’-type model describes an upper/lower crustal decoupling and wedging of both the European and the Adriatic–African continents.