检索结果-南通市图书馆

Integrative Zoology 2017年第1期12卷 49-60页

作者： Francisco CARRO Ramón C.SORIGUER Doñana Biological Station(CSIC) the Monitoring Team on Natural Resources and Processes of the Doñana Biological Station Ethology and Biodiversity Conservation SevillaSpain

The iberian hare(Lepus granatensis)is a widely distributed endemic species in the iberian *** improve our knowledge of its population dynamics,the relative abundance and population trends of the iberian hare were studied in the autumns of 1995-2012 in a protected area(Doñana National Park)by spotlighting in 2 different habitats:marshland and *** average relative abundance was 0.38 hare/km(SD=0.63)in the marshland and 3.6 hares/km(SD=4.09)in *** iberian hare population exhibited local interannual fluctuations and a negative population trend during the study period(1995-2012).The results suggest that its populations are in *** flooding of parts of the marshland in June,July and October favor hare abundance in the *** abundance in the marshland increases as the flooded surface area increases in *** effects are more pronounced if the rains are early(October)and partially flood the *** contrast,when marsh grasses and graminoids are very high and thick(as measured using the aerial herbaceous biomass[biomass marshland]as a proxy),the abundance of hares decreases dramatically as does the area of the marsh that is flooded(in November).

关键词： Doñana iberian peninsula Lepus granatensis population dynamics trends

A Regional Climate Study of Heat Waves over the iberian peninsula

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Climate Sciences 2014年第5期4卷 841-853页

作者： Hari Prasad Dasari Isaac Pozo Francisco Ferri-Yánez Miguel B. Araújo Centro de Geofisica de Evora University of EvoraEvoraPortugal Museo Nacional de Ciencias Naturales CSICMadridSpain Centro de Biodiversidade e Recursos Genéticos(InBIO-CIBIO) University of EvoraEvoraPortugal Imperial College London Silwood Park CampusBerkshireUK

We present a regional climate simulation for the iberian peninsula for a 60-year period (1950-2009) using the WRF-ARW model with a focus on the simulation of summer maximum temperatures and associated extreme heat waves. The WRF model was designed at a 5 km horizontal resolution on a 5-month (May-September) seasonal scale, for every year, during the study period with initial/boundary conditions derived from NCEP 2.5 degree reanalysis. The comparison of simulated mean summer seasonal maximums and mean maximums of June, July, and August months with the corresponding E-OBS data sets indicates that the model is able to characterize the spatial variation of magnitudes of temperature change over the iberian peninsula. The mean extreme heat wave conditions during the climate period 1950-2009 are well simulated and match the observations well. The regional scale simulations clearly show the propagation of intense heat waves from the south west to north east of Iberia. The WRF-ARW model also simulated well the general trend of increase in heat waves over most parts of the iberian peninsula during the study period 1950-2009. The characteristics of the most severe heat waves years 2003 and 2006 are also well simulated by the model.

关键词： Downscaling Heat Waves iberian peninsula Regional Climate Modelling

Developing spatially and thematically detailed backdated maps for land cover studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2017年第2期10卷 175-206页

作者： Juan JoséVidal-Macua Alaitz Zabala Miquel Ninyerola Xavier Pons Dep Geografia Grumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain Dep Biologia Animal Vegetal i EcologiaGrumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain

Global or regional land cover change on a decadal time scale can be studied at a high level of detail using the availability of remote sensing data such as that provided by ***,there are three main technical challenges in this ***,the generation of land cover maps without reference data is problematic(backdating).Second,it is important to maintain high accuracies in land cover change map products,requiring a reasonably rich legend within each ***,a high level of automation is necessary to aid the management of large volumes of *** paper describes a robust methodology for processing time series of satellite data over large spatial *** methodology includes a retrospective analysis used for the generation of training and test data for historical periods lacking reference *** methodology was developed in the context of research on global change in the iberian *** this study we selected two scenes covering geographic regions that are representative of the iberian *** each scene,we present the results of two classifications(1985-1989 and 2000-2004 quinquennia),each with a legend of 13 *** overall accuracy of over 92%was obtained for all 4 maps.

关键词： Land cover mapping Landsat statistical classifiers backdating iberian peninsula

A seismological evidence for the northwestward movement of Africa with respect to Iberia from shear-wave splitting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2012年第5期3卷 681-696页

作者： Mohamed K.Salah Geology Department Faculty of Science Tanta UniversityTanta 31527Egypt

Seismic anisotropy and its main features along the convergent boundary between Africa and Iberia are detected through the analysis of teleseismic shear-wave splitting. Waveform data generated by 95 teleseismic events recorded at 17 broadband stations deployed in the western Mediterranean region are used in the present study. Although the station coverage is not uniform in the iberian peninsula and north- west Africa, significant variations in the fast polarization directions and delay times are observed at stations located at different tectonic domains. Fast polarization directions are oriented predominantly NW-SE at most stations which are close to the plate boundary and in central Iberia; being consistent with the absolute plate motion in the region. In the northern part of the iberian peninsula, fast velocity direc- tions are oriented nearly E--W; coincident with previous results. Few stations located slightly north of the plate boundary and to the southeast of lberia show E--W to NE-SW fast velocity directions, which may be related to the Alpine Orogeny and the extension direction in lberia. Delay times vary significantly between 0.2 and 1.9 s for individual measurements, reflecting a highly anisotropic structure beneath the recording stations. The relative motion between Africa and lberia represents the main reason for the observed NW-SE orientations of the fast velocity directions. However, different causes of anisotropy have also to be considered to explain the wide range of the splitting pattern observed in the western Mediterranean region. Many geophysical observations such as the low Pn velocity, lower lithospheric Q values, higher heat flow and the presence of high conductive features support the mantle flow in the western Mediterranean, which may contribute and even modify the splitting pattern beneath the studied region.

关键词： Shear-wave splitting Seismic anisotropy iberian peninsula Northwest Africa Western Mediterranean

Modeling of Rayleigh wave dispersion in Iberia

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2011年第1期2卷 35-48页

作者： Jose Badal Yun Chen Zhongjie Zhang Physics of the Earth Sciences B University of Zaragoza Pedro Cerbuna 12 50009 Zaragoza Spain State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 PR China

Phase and group velocities of 15-70 s Rayleigh waves propagating across the iberian Penin- sula have been transformed into local dispersion curves by linear inversion of travel times. The procedure permits that the waveform dispersion to be obtained as a continuous period-dependent velocity function at grid points belonging to the area probed by the waves, thus providing phase- and group-velocity contour maps for several periods within the interval of interest. The regionalization process rests on a homoge- neous initial data set in which the number of observations remains almost constant for all periods of reference. Damped least-squares inversion of the local dispersion curves for shear-wave velocity structure is performed to obtain depth-dependent S-wave velocity profiles at the grid points covering the model region. The reliability of the results should improve significantly owing to the use of phase and group velocities simultaneously. On this basis, we have built horizontal depth sections that give an updated view of the seismic velocity structure of the peninsula at lithospheric and upper mantle depths （20--200 km）. After averaging all the pure-path S-wave velocities previously determined at each grid point, the velocity- depth models so obtained for major tectonic units allow the comparison between the Hercynian basement and other areas of Mesozoic folding and Tertiary hasins

关键词： Rayleigh waves Local dispersion Inversion Tectonics iberian peninsula

A Comparative Analysis between the Spanish and Portuguese Seismic Codes: Application to a Border RC Primary School

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Mechanics Engineering and Automation 2020年第3期10卷 87-97页

作者： María-Victoria Requena-Garcia-Cruz Antonio Morales-Esteban María-Luisa Segovia-Verjel Emilio Romero-Sánchez Jaime De-Miguel-Rodríguezand João Manuel Carvalho Estêvão Department of Building Structures and Geotechnical Engineering University of SevilleAv.Reina Mercedes 2Seville 41012Spain Department of Civil Engineering ISEUniversity of AlgarveFaro 8005-139Portugal

The iberian peninsula is close to the Eurasia-Africa plate boundary resulting in a considerable seismic *** fact,the southwestern iberian peninsula is affected by far away earthquakes of long-return period with large-very large magnitude.A project named PERSISTAH(Projetos de Escolas Resilientes aos SISmos no Território do Algarve e de Huelva,in Portuguese)aims to cooperatively assess the seismic vulnerability of primary schools located in the Algarve(Portugal)and Huelva(Spain).Primary schools have been selected due to the considerable amount of similar buildings and their seismic *** Portugal,the Decreto Lei 235/83(RSAEEP)is mandatory while in Spain,the mandatory code is the Seismic Building Code(NCSE-02).In both countries,the Eurocode-8(EC-8)is *** the fact that both regions would be equally affected by an earthquake,both seismic codes are significantly *** research compares the seismic action of Ayamonte(Huelva)and Vila Real de Santo António(Portugal).Both towns are very close and located at both sides of the ***,they share the same *** analysis has been applied considering a reinforced concrete(RC)primary school building located in *** do so,the performance-based method has been *** seismic action and the damage levels are compared and *** results have shown considerable differences in the seismic actions designation,in the performance point values and in the damage *** values considered in the Portuguese code are significantly more *** agreement between codes should be made for border regions.

关键词： Performance-based method seismic code seismic behaviour nonlinear analysis iberian peninsula RC building