A numerical model for the simulation of debris flow triggering,propagation and arrest     

D’Aniello  Andrea  Cozzolino  Luca  Cimorelli  Luigi  Della Morte  Renata  Pianese  Domenico 《Natural Hazards》2015,75(2):1403-1433

Natural Hazards - In this paper, it is described the development and the assessment of a 1D numerical procedure for the simulation of debris flow phenomena. The procedure focuses on: (1) the...  相似文献   

Using entropy theory to improve the definition of homogeneous regions in the semi-arid region of Brazil     

Renata D.G. Rodriguez  Vijay P. Singh  Fernando F. Pruski  Arthur T. Calegario 《水文科学杂志》2013,58(11):2096-2109

ABSTRACT

Although the semi-arid region of Brazil appears to be homogeneous due to drought conditions, there is a great deal of variability in climatic elements in the region, so that the definition of homogeneous regions will provide the deployment of measures appropriate for each locality. However, the limited information on climatic parameters in the region makes it difficult to define these regions. This problem can, however, be alleviated by the use of entropy theory. Therefore, this study aimed to investigate the potential of the theory to identify hydrologically homogeneous regions for conditions of the semi-arid region of Brazil. Entropy-based Disorder Index (DI) data were computed, based on monthly precipitation and monthly water balance (precipitation – reference evapotranspiration) for 290 gauge stations. For defining homogeneous regions, cluster analysis was utilized, using the data on geographical information about rain gauges (latitude and longitude), annual precipitation, annual water balance, coefficient of skewness, coefficient of kurtosis and DI. The identification of homogeneous regions in the Brazilian semi-arid region was only possible when the grouping of stations was performed, based on DI for precipitation and latitude. Results showed the definition of seven homogeneous regions in the semi-arid region of Brazil.  相似文献   

Aliphatic hydrocarbons in biota from the Gulf of Naples (Italy)     

Amodio-Cocchieri R  Cirillo T 《Marine pollution bulletin》2003,46(3):374-377

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Erratum to “Origin of a Toarcian manganese carbonate/silicate deposit from the Krí?na unit, Tatra Mountains, Poland” [Chemical Geology 224 (2005) 136-152]     

Renata Jach  Teresa Dudek 《Chemical Geology》2006,228(4):289

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Neoproterozoic–Early Paleozoic events in Southwest Gondwana: Introduction     

Renata S. Schmitt  Guest editor  Hartwig E. Frimmel  Guest editor  Thomas R. Fairchild  Guest editor 《Gondwana Research》2008,13(4):435-436

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Dissolved uranyl complexed species in artificial seawater     

Renata Djogi&#x;  Marko Branica 《Marine Chemistry》1991,36(1-4)

The distribution of dissolved uranyl species was calculated on the basis of the stability constants published elsewhere and compared with the results obtained from the experiments performed in artificial seawater. According to the distributions calculated and electrochemical and spectrophoto-metrical measurements performed in model electrolytes and artificial seawater (pH=8.2) in the presence of sufficient hydrogen peroxide, uranium most probably predominates in the form of a mixed uranyl-dicarbonato-hydrogenperoxo complex. The results obtained could be applied to the natural marine photic zone.The mixed complex has to be taken into account as an additional form of dissolved uranium species influencing their cycle in natural water systems. Recent discovery of the presence of hydrogen peroxide in the surface waters of seas has challenged a long-held notion of the prevalence of uranyl-carbonato complexes in seawater.  相似文献   

Community structure of macrobenthos in two tropical sandy beaches with different morphodynamic features, Rio de Janeiro, Brazil     

Renata Soares Ramalho Fernandes  & Abilio Soares-Gomes 《Marine Ecology》2006,27(2):160-169

The macrobenthos of two exposed tropical sandy beaches in Rio de Janeiro (Brazil) were compared in relation to density, species richness, and vertical zonation. Biological and sediment samplings were carried out in the austral winter of 2002 and the austral summer of 2003. The sampling design consisted of 10 transects perpendicular to the water line, evenly divided into strata. A sampling unit was taken in each stratum with a 0.04 m² quadrat sampler. Beaches were also compared according to physical features, such as slope, wave period, wave height, and grain size. According to Dean's Ω morphodynamic index the Pontal is a dissipative beach while the Costa Azul is a reflective one. The mean grain size ranged from median to coarse sand in Costa Azul, whereas in Pontal it ranged from median to very fine sand. Eleven species were collected in the two beaches. Crustaceans were the dominant in the Costa Azul Beach, while the polychaete Scolelepis squamata dominated the Pontal beach. A negative correlation was found between the density of the macrobenthos and mean grain size, and beach slope. On the other hand, the Dean's parameter correlated positively with faunal density. Based on the results of ANOSIM, in both beaches, two groups of stations were identified, defining an upper and a lower beach zone along the vertical distribution of the macrobenthos.  相似文献   

Survey of Geomagnetic Observations Made in the Northern Sector of Russia and New Methods for Analysing Them     

Alexei Gvishiani  Renata Lukianova  Anatoly Soloviev  Andrei Khokhlov 《Surveys in Geophysics》2014,35(5):1123-1154

An overview of the geomagnetic observations made in the northern part of Russia is presented from a historical perspective. Several stations were deployed on the territory of the former Soviet Union during the International Geophysical Year, 1957–1958, with the active participation and guidance of the Interagency Geophysical Committee which is inherited by the Geophysical Center of the Russian Academy of Sciences (GC RAS). In the 1990s, the majority of these stations, especially those in the remoter regions, were closed. Nowadays, the geomagnetic network, including the observatories of the INTERMAGNET program, has been restored. Examples of high-latitude geomagnetic variations in the Russian longitudinal sector are shown, and maps and trends of the secular variation over the territory of Russia presented. Particular attention is paid to the automated processing of data and to the analysis methods used. To process the growing amount of high-resolution geomagnetic data, sophisticated mathematical methods based on the fuzzy logic approach and new discrete mathematical analysis algorithms have been developed. The formal methods and algorithms for recognizing both artificial and natural disturbances in the magnetograms are described.  相似文献   

Hydrology needed to manage droughts: the 2015 European case   总被引：1，自引：0，他引：1       下载免费PDF全文

Henny A.J. Van Lanen  Gregor Laaha  Daniel G. Kingston  Tobias Gauster  Monica Ionita  Jean‐Philippe Vidal  Radek Vlnas  Lena M. Tallaksen  Kerstin Stahl  Jamie Hannaford  Claire Delus  Miriam Fendekova  Luis Mediero  Christel Prudhomme  Ekaterina Rets  Renata J. Romanowicz  Sébastien Gailliez  Wai Kwok Wong  Mary‐Jeanne Adler  Veit Blauhut  Laurie Caillouet  Silvia Chelcea  Natalia Frolova  Lukas Gudmundsson  Martin Hanel  Klaus Haslinger  Maria Kireeva  Marzena Osuch  Eric Sauquet  James H. Stagge  Anne F. Van Loon 《水文研究》2016,30(17):3097-3104

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Probabilistic modelling of macroseismic attenuation and forecast of damage scenarios     

Renata Rotondi  Elisa Varini  Carla Brambilla 《Bulletin of Earthquake Engineering》2016,14(7):1777-1796

According to the idea now widespread that macroseismic intensity should be expressed in probabilistic terms, a beta-binomial model has been proposed in the literature to estimate the probability of the intensity at site in the Bayesian framework and a clustering procedure has been adopted to define learning sets of macroseismic fields required to assign prior distributions of the model parameters. This article presents the results concerning the learning sets obtained by exploiting the large Italian macroseismic database DBM1I11 (Locati et al. in DBMI11, the 2011 version of the Italian Macroseismic Database, 2011. http://emidius.mi.ingv.it/DBMI11/) and discusses the problems related to their use in probabilistic modelling of the attenuation in seismic regions of the European countries partners of the UPStrat-MAFA project (2012), namely South Iceland, Portugal, SE Spain and Mt Etna volcano area (Italy). Anisotropy and the presence of offshore earthquakes are some of the problems faced. All the work has been carried out in the framework of the Task B of the project.  相似文献