Barotropic tide in the northeast South China Sea   总被引：2，自引：0，他引：2  

Beardsley  R.C. Duda  T.F. Lynch  J.F. Irish  J.D. Ramp  S.R. Ching-Sang Chiu Tswen Yung Tang Yang  Y.-J. Guohong Fang 《Oceanic Engineering, IEEE Journal of》2004,29(4):1075-1086

A moored array deployed across the shelf break in the northeast South China Sea during April-May 2001 collected sufficient current and pressure data to allow estimation of the barotropic tidal currents and energy fluxes at five sites ranging in depth from 350 to 71 m. The tidal currents in this area were mixed, with the diurnal O1 and K1 currents dominant over the upper slope and the semidiurnal M2 current dominant over the shelf. The semidiurnal S2 current also increased onshelf (northward), but was always weaker than O1 and K1. The tidal currents were elliptical at all sites, with clockwise turning with time. The O1 and K1 transports decreased monotonically northward by a factor of 2 onto the shelf, with energy fluxes directed roughly westward over the slope and eastward over the shelf. The M2 and S2 current ellipses turned clockwise and increased in amplitude northward onto the shelf. The M2 and S2 transport ellipses also exhibited clockwise veering but little change in amplitude, suggesting roughly nondivergent flow in the direction of major axis orientation. The M2 energy flux was generally aligned with the transport major axis with little phase lag between high water and maximum transport. These barotropic energy fluxes are compared with the locally generated diurnal internal tide and high-frequency internal solitary-type waves generated by the M2 flow through the Luzon Strait.  相似文献   

德国莱布尼兹汉诺威大学景观规划系教授Antje Stokman:景观规划设计:城市可持续发展的基础     

Antje Stokman 《中国勘察设计》2007,(3):63-63

考虑一下我们城市的发展，我们在建立自己生活空间的同时，使得城市不断地发展和扩大。城市的规模在不断地增加，结构与以前也有了很大的不同，城市的建筑和景观不像过去那么密集，那么，为什么城市有了这样一个结构？因为人们在追求更好的生活环境和更高的生活质量，而且他们也希望能够在城市当中有更多的空间和时间。这样一来，城市不再以密集的方式发展，而是出现了这种零散化、片段化的趋势。中国城市发展的速度是非常快的，现在人们越来越多地注意到城市的边缘在不断地扩大，城市的景观和农村也在不断地融合，看起来，它既不是城市的景观，  相似文献   

Latent heat fluxes simulated with a non-hydrostatic weather forecast model using actual surface properties from measurements and remote sensing     

Claudia Heret  Antje Tittebrand  Franz H. Berger 《Boundary-Layer Meteorology》2006,121(1):175-194

In this study the influence of land-surface parameters on latent heat fluxes simulated with the numerical weather prediction model Lokalmodell (LM) of the German Meteorological Service is investigated. The area of interest is the LITFASS area during the LITFASS-2003 campaign. Based on simulations with varying soil and vegetation properties, we confirm that simulated latent heat fluxes strongly depend on soil moisture and leaf area index. Both parameters are difficult to obtain from in situ measurements with sufficient spatial resolution over heterogeneous land surfaces. Therefore, a procedure is proposed to determine area average values of soil moisture from time domain reflectometer measurements performed at a limited number of sites. The area averages cover the 7 × 7 km² grid cells of the LM around Lindenberg (south-east of Berlin). Furthermore, satellite inferred plant parameters from NOAA–AVHRR are used to initialise model runs; the derived vegetation parameters show notable differences with those in the standard input of LM. The latent heat fluxes from the LM are compared with the aggregated eddy-covariance-measurements, and while the operational LM shows a strong overestimation of latent heat fluxes, it is demonstrated that the application of land-surface parameters derived from measurements can significantly reduce the deviation between the simulated and measured latent heat fluxes.  相似文献   

Foreword     

Seweryn J. Duda 《Tectonophysics》1985,118(3-4)

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Polybaric differentiation of alkali basaltic magmas: evidence from green-core clinopyroxenes (Eifel,FRG)   总被引：5，自引：0，他引：5  

Antje Duda  Hans -Ulrich Schmincke 《Contributions to Mineralogy and Petrology》1985,91(4):340-353

The Quaternary foidites and basanites of the West Eifel (Germany) contain optically and chemically heterogeneous clinopyroxenes, some of which occur as discrete zones within individual crystals: Most clinopyroxene phenocrysts are made up of a core and a normally zoned comagmatic titanaugite mantle. Most cores are greenish pleochroic and moderately resorbed (fassaitic augite). Some are pale green and strongly resorbed (acmitic augite). Cores of Al-augite composition and of Cr-diopside derived from peridotite xenoliths are rare. The fassaitic augites are similar in trace element distribution pattern to the titanaugites, but are more enriched in incompatible elements. The acmitic augites, in contrast, are clearly different in their trace element composition and are enriched in Na, Mn, Fe and depleted in Al, Ti, Sr, Zr. A model for polybaric magma evolution in the West Eifel is proposed: Primitive alkali basaltic magma rises through the upper mantle precipitating Al-augite en route. It stagnates and differentiates near the crust/mantle boundary crystallizing Fe-rich fassaitic augites. The magma differentiated at high pressure is subsequently mixed with new pulses of primitive magma from which the rims of pyroxene are crystallized. Sporadic alkali pyroxenite xenoliths are interpreted to represent cumulates of cognate phases formed within the crust and not metasomatized upper mantle material (Lloyd and Bailey 1975).  相似文献   

An earthquake migration pattern of high statistical significance     

James A. Powell  Seweryn J. Duda 《Pure and Applied Geophysics》1975,113(1):461-466

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Strain Release in the Circum-Pacific Belt: Kern County 1952, Desert Hot Springs 1948, San Francisco 1957     

Seweryn J. Duda  Markus Båth 《Geophysical Journal International》1963,7(5):554-570

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Late Glacial and Holocene depositional history in the eastern part of the Szczecin Lagoon (Great Lagoon) basin—NW Poland     

Ryszard K. Borwka  Andrzej Osadczuk  Andrzej Witkowski  Brygida Wawrzyniak-Wydrowska  Tomasz Duda 《Quaternary International》2005,130(1):87

Analyses on 27 sediment cores taken from the bottom of the Szczecin Lagoon allowed environmental reconstruction of the postglacial main stages of basin development, based on detailed sedimentological, geochemical, diatomological and malacological studies of selected key cores. Studies revealed that during the Late Glacial and Holocene this area developed in several stages. In the Late Glacial the whole study area constituted a low alluvial plain. At the turn from Younger Dryas to Holocene the alluvial plain was cut through by the Odra river to a level of 10–11 m below sea level (b.s.l.). Along with the first phases of the Holocene marine transgression at the southern Baltic Sea's coasts the accumulation of the limnic-swampy deposits began in this lower part of the Odra valley. At ca. 6–6.5 ka BP the transgression proceeded and Littorina Sea waters flooded the area. At that time the Szczecin Lagoon constituted a marine embayment in which series of sands, partly rich in malacofauna, was deposited. The development of the Swina barrier resulted in the isolation of the embayment from the direct inflow of Baltic Sea waters.  相似文献   

Head waves in laterally heterogeneous media     

T. B. Yanovskaya  S. J. Duda 《Geophysical Journal International》1984,79(1):65-76

Summary. A layer of constant thickness over a half-space is assumed, and the propagation of head waves is considered for the following two cases: (1) the P -wave velocity varies in the layer in the horizontal direction, and is constant in the half-space: (2) the P -wave velocity varies in the half-space in the horizontal direction, and is constant in the layer. In each case the horizontal velocity gradient is assumed to remain constant. The wave propagation is investigated in the direction of the gradient (direct profile), and opposite to it (reverse profile). Formulae for the travel times and the amplitudes are obtained on the basis of ray-theoretical considerations. Conditions are discussed for the discrimination in a field experiment between the case of a sloping boundary separating the homogeneous media, and the case of an intrinsic horizontal velocity gradient.  相似文献   

Foreword     

Seweryn J. Duda 《Tectonophysics》1983,93(3-4)

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