Search results for "bepress|Physical Sciences and Mathematics|Earth Sciences"
showing 10 items of 2332 documents
Evolution of dry season low cloud cover over the Atlantic coast of Central Africa from diurnal to interannual scale
2022
Despite its bioclimatic importance, few studies have focused on the stratiform low-level cloud cover ofthe dry season (June-September) of the Atlantic coast of Central Africa. Using in-situ data documenting theperiod 1971-2019, we show that this cloud cover is underestimated by SAFNWC satellite observations andCMIP6 models. We identify three types of days: clear, cloudy at night and totally cloudy, the latterbeing more frequent on the coast and inland, to the windward of the Cristal and Chaillu Mountains. Onan interannual scale, temperature anomalies in the South Tropical Atlantic, the equatorial Pacific and theCongo Basin, by modulating the meridional and zonal circulation cells, influence…
Zemes dzīļu bagātības Latvijā: DOLOMĪTS
2021
Buklets "Zemes dzīļu bagātības Latvijā: DOLOMĪTS" iepazīstina ar vienu no Latvijas vērtīgākajiem dabas resursiem, tā daudzveidību un tajā atklātajiem interesantajiem minerāliem. Iekļauta informācija par dolomītu pētniecību, nozīmīgākajām mūsdienās izmantojamām dolomīta atradnēm un atšķirīgajiem pielietojuma veidiem. Bukletu ilustrē Latvijas Universitātes Muzeja Ģeoloģijas kolekciju dolomīta paraugu fotogrāfijas.
Les relations entre les sociétés et le fleuve Loire depuis le Moyen-Âge
2008
L'objectif de cet article est la compréhension des inter-relations entre un système fluvial – la Loire – et les sociétés riveraines. Souvent qualifiée de « dernier fleuve sauvage d'Europe » et réputée pour son patrimoine historique et écologique, la Loire a cependant subi depuis des siècles des interventions et aménagements variés. Les recherches interdisciplinaires récentes mettent en évidence l'importance des actions anthropiques sur le fonctionnement hydro-morphodynamique et écologique du fleuve depuis le Moyen-Âge. Les formes fluviales et les paysages actuels expriment des réajustements du fleuve à l'évolution de facteurs hydro-climatiques et socio-économiques qui jouent sur des pas de …
SURCOTES MARINES DANS LE GOLFE DU LION ET FORCAGES ATMOSPHERIQUES : VARIABILITE CONTEMPORAINE ET FUTURE (1950-2100)
2010
Sea surges in the Gulf of Lions are mainly forced by southerly and south-easterly winds. This regional-scale atmospheric circulation is leading by a strong zonal gradient between low pressure system over the Bay of Biscay and high pressure over central Europe. This synoptic-scale circulation mostly happens during “Greenland Above” weather regime. In the second half of the 20th century, a slow increase of the sea-level pressure over central Europe increased the probability of having “Greenland Above” weather types associated with a southerly atmospheric circulation in the Gulf of Lions, thus leading to strong surges. A linear regression is used to simulate the interannual variability of high…
Désagrégation dynamique des pluies de la Tunisie par le modèle climatique régional ARW/WRF.
2014
7 pages; International audience; Ce travail évalue les capacités du modèle climatique régional ARW/WRF (version 3) à reproduire les pluiessaisonnières et annuelles de la Tunisie et du bassin méditerranéen. Les simulations climatiques consistent en un ensemble dedix membres de vingt-et-un ans et sont forcées latéralement par les réanalyses européennes ERA-Interim. La descented'échelle est basée sur deux domaines emboîtés avec un premier domaine de 60 km de résolution qui couvre le bassinméditerranéen et un second domaine (résolution spatiale de 12 km de maille) centré sur la Tunisie. À l'échelle du premierdomaine, WRF reproduit bien la variabilité spatiale des cumuls annuels moyens des pluie…
Geomatic applications tourban park in palermo
2015
Over the last few years topographical techniques have developed an exponential trend towards simplifying and speeding, both survey operations and analysis of data collected reaching at the same time ever higher levels of accuracy. Among the technologies that are increasingly taking the field in this context is part of the Mobile Mapping System (MMS) that, on any mobile platform, combines sensors and measurement systems designed to provide a 3D position of the platform and, at the same time, capable to acquire geographic data without the aid of control points on the ground. The study reported concerns the verification of the reliability metrics and a qualitative MMS in order to evaluate its …
The impact of noise on the population of an urban centre in Valencia (Spain)
1997
Acoustic contamination in residential areas is a generalized problem. This paper reports the results of a survey trying to evaluate this contamination in the historical center of Valencia and about its effects upon that district's residents. A total of 700 residents in 11 different neighbourhoods of the city of Valencia were interviewed; at the same time environmental noise was determined at 225 different points within the area of study. In the historical center of Valencia, there exists an important problem of environmental noise and the daily levels clearly exceed the recommended limits.
Benchmark study of undrained triaxial testing of Opalinus Clay shale: Results and implications for robust testing
2021
Triaxial testing of argillaceous rocks and shales is significantly more challenging than conventional rock mechanical testing. The challenges are mainly related to the very low permeability of these geomaterials, and their sensitivity to exposure of atmosphere and brines, which induces variations of water content, suction and effective stress. There are currently no international standards to guide service laboratories for robust testing procedures for shales. A benchmark study of undrained triaxial testing was therefore initiated with three leading service laboratories in shale testing, performing 13 tests and using two different methods of establishing sample saturation prior to deformati…
Supporting information for the article: Elastic geobarometry for anisotropic inclusions in anisotropic host minerals: quartz-in-zircon.
2021
This dataset contains the supporting information for the article: Gonzalez et al. Elastic geobarometry for anisotropic inclusions in anisotropic host minerals: quartz-in-zircon. Journal of Geophysical Research: Solid Earth.These supplementary materials provide further details about the elastic properties, axial conventions, and relative orientation of the host zircon and the quartz inclusion. The datasets provide all the results of the quartz-in-zircon calculations in table format. The datasets include the unrelaxed and relaxed strains, and the relaxation tensors.
Mapping a-priori defined plant associations using remotely sensed vegetation characteristics
2014
Abstract Incorporation of a priori defined plant associations into remote sensing products is a major challenge that has only recently been confronted by the remote sensing community. We present an approach to map the spatial distribution of such associations by using plant indicator values (IVs) for salinity, moisture and nutrients as an intermediate between spectral reflectance and association occurrences. For a 12 km 2 study site in the Netherlands, the relations between observed IVs at local vegetation plots and visible and near-infrared (VNIR) and short-wave infrared (SWIR) airborne reflectance data were modelled using Gaussian Process Regression (GPR) (R 2 0.73, 0.64 and 0.76 for sali…