Contrasting interannual and multidecadal NAO variability     

T. Woollings  C. Franzke  D. L. R. Hodson  B. Dong  E. A. Barnes  C. C. Raible  J. G. Pinto 《Climate Dynamics》2015,45(1-2):539-556

  相似文献   

Vegetation pattern as an indicator of saturated areas in a Czech headwater catchment          下载免费PDF全文

Alena Kulasova  Sarka Blazkova  Keith Beven  Daniela Rezacova  Jiri Cajthaml 《水文研究》2014,28(20):5297-5308

  相似文献   

An Innovative Post Grouting Technique for Soil Nails     

Barbosa  Max Gabriel Timo  de Assis  André Pacheco  da Cunha  Renato Pinto 《Geotechnical and Geological Engineering》2022,40(11):5539-5546

This study presents an innovative technique of executing soil nails called sectorized post grouting (SPG). The most utilized technique of soil nail grouting is gravity grouting, with the literature reporting advances in pressurized grouting. Although obtaining higher pullout resistance of soil nails, pressurized grouting, mostly done in single-stage grouting, does not compensate for exudation and its use in higher nail lengths is difficult. Thus, a technique has been developed that compensates for exudation, with easier application in lengthier nails. The technique was qualitatively assessed to evaluate its surface roughness and later applied in seven real soil nailing works, where it could be quantitatively assessed. The results show that sectorized post-grouted nails obtained greater pullout resistances than gravity grouted and single-stage grouted nails. Although similar improvement was found in tube-à-manchette (TAM) grouted nails, this method presents lower economic efficiency than sectorized post grouting. The pullout resistance results obtained in this study can be utilized in future soil nailing works executed utilizing SPG.

  相似文献   

Land use and land cover dynamics in Leiria City: relation between peri-urbanization processes and hydro-geomorphologic disasters     

Barros  José Leandro  Tavares  Alexandre Oliveira  Santos  Pedro Pinto 《Natural Hazards》2021,106(1):757-784

Natural Hazards - The objective of the present study is to evaluate the relation between the spatial and temporal dynamics of Land Use and Land Cover (LULC) and the hydro-geomorphological processes...  相似文献   

Behaviour of Instrumented Hollow Auger Pile Groups in Sandy Soil     

Soares  Wilson Cartaxo  Coutinho  Roberto Quental  da Cunha  Renato Pinto 《Geotechnical and Geological Engineering》2021,39(8):5599-5618

Geotechnical and Geological Engineering - Hollow auger piles are a new solution technique being used more often in recent years as a foundation for buildings of 15 floors or less in the coastal...  相似文献   

Phylogeography of Ophryotrocha labronica (Polychaeta,Dorvilleidae) along the Italian coasts          下载免费PDF全文

Piero Cossu  Ferruccio Maltagliati  Federica G. Pannacciulli  Roberto Simonini  Gloria Massamba‐N'Siala  Marco Casu  Claudio Lardicci  Daniela Prevedelli  Alberto Castelli 《Marine Ecology》2015,36(4):1088-1097

Species of the genus Ophryotrocha are a well‐studied group of organisms but, despite the relatively large body of biological studies, little is known about their intra‐specific patterns of genetic diversity. In the present study, we analysed the patterns of genetic variation in samples of Ophryotrocha labronica (Polychaeta, Dorvilleidae) collected along the Italian coasts within three regions with different thermal regimes: the Northern Adriatic Sea (NAS), the Ligurian Sea (LS), and the South/Southeast Sicilian Sea (SS). A partial sequence of the cytochrome c oxidase subunit I (COI) gene was used as a genetic marker. An analysis of molecular variance (AMOVA) showed significant genetic differentiation between the NAS and the other regions. Conversely, little or no genetic structuring was found between the LS and the SS or amongst locations within a given region. A Bayesian phylogenetic tree and a median‐joining network provided evidence for the occurrence of two highly divergent genetic lineages characterized by a high average sequence divergence (17.2%, Kimura two‐parameter distance). The spatial patterns of genetic variation found in O. labronica may reflect the signature of past expansion events of the two genetic lineages. Although the high sequence divergence suggested that cryptic speciation within O. labronica may have occurred, other traits such as the absence of reproductive isolation, pattern of phenotypic variation and habitat specificity prompted us to regard the two groups as distinct COI lineages of O. labronica.  相似文献   

Satellite laser ranging to GPS and GLONASS   总被引：5，自引：4，他引：1  

Krzysztof Sośnica  Daniela Thaller  Rolf Dach  Peter Steigenberger  Gerhard Beutler  Daniel Arnold  Adrian Jäggi 《Journal of Geodesy》2015,89(7):725-743

  相似文献   

Radial distribution of lead and lead isotopes in stem wood of Norway spruce: A reliable archive of pollution trends in Central Europe     

Martin Novak  Jitka Mikova  Jan Kosler  Eva Prechova  Daniela Fottova 《Geochimica et cosmochimica acta》2010,74(15):4207-4218

Annual growth rings of a common hardwood species, Picea abies L., were investigated as a potential archive of past atmospheric Pb pollution. Wide distribution of trees in terrestrial settings and straightforward chronology are two advantages of this potential geochemical archive, but several processes described in the literature may obscure the trends in past Pb deposition. These confounding factors include, e.g., radial post-depositional mobility of Pb in xylem, and ecosystem acidification leading to higher bioavailability of Pb. One- to five-year annual wood increments were analyzed for Pb concentrations and ²⁰⁶Pb/²⁰⁷Pb ratios at Jezeri (JEZ), Uhlirska (UHL) and Na Lizu (LIZ), three sites in the Czech Republic, differing in atmospheric Pb loads. Three to four trees per site were included in the study. Distinct Pb concentration maxima between 1960 and 1990 at the two heavily polluted sites (JEZ and UHL) coincided with historical Pb emissions known from inventories of industrial production. No Pb concentration maxima were found at one site, LIZ, situated in a national park 150 km from major pollution sources. Spruce tree rings from JEZ, located just 5 km from coal-burning power stations, contained a large proportion of coal-derived Pb (a high-²⁰⁶Pb/²⁰⁷Pb ratio of 1.19). A coal-related maximum in ²⁰⁶Pb/²⁰⁷Pb in JEZ tree rings was found using two different analytical techniques, laser-ablation multi-collector ICP MS, and single-collector sector-field ICP MS. In a three-isotope graph (²⁰⁶Pb/²⁰⁷Pb vs. ²⁰⁸Pb/²⁰⁷Pb), tree-ring data plotted into the field of ombrotrophic (i.e., rain-fed) peat bogs, suggesting negligible contribution of bedrock-derived Pb in the xylem. We concluded that none of the potential confounding factors played a major role at our sites. Annual growth rings of P. abies in Central Europe faithfully recorded historical changes in atmospheric Pb depositions.  相似文献   

Brazil's premier gold province. Part I: The tectonic, magmatic, and structural setting of the Archean Rio das Velhas greenstone belt, Quadrilátero Ferrífero     

Lydia Lobato  Luiz Ribeiro-Rodrigues  Márcia Zucchetti  Carlos Noce  Orivaldo Baltazar  Luiz da Silva  Claiton Pinto 《Mineralium Deposita》2001,36(3-4):228-248

  相似文献   

The investigation of potential earthquake sources in peninsular Italy: A review     

Gianluca Valensise  Daniela Pantosti 《Journal of Seismology》2001,5(3):287-306

We summarise and discuss almost a century of progress inthe understanding of the main characteristics of large Italian earthquakes.Topics of discussion include (1) the distribution of the largest earthquakesin relation with Late Pleistocene and Holocene faulting, (2) the geologicaland tectonic setting of the 1908 Messina Straits, 1915 Fucino Plain and1980 Irpinia earthquakes, (3) some of the geodynamic motivations for thecharacteristics of Italian seismicity, and (4) the resulting implications for theassessment of seismic hazard. In a subsequent section of the paper we present a summaryof recent achievements in the understanding and characterization of Italianseismicity, with special emphasis on the assignment of large historicalearthquakes to specific sources identified through geological observationsand on the evaluation of average recurrence intervals for individualearthquake sources. The final section describes some of the efforts being madefor matching the newly acquired geological evidence with instrumental andhistorical observations of Italian seismicity and the hypotheses than can bederived for anticipating the locus of large earthquakes of the future.  相似文献