Procesos de erosion en Tunel (Piping) en cuencas sedimentarias de Murcia (Espana). Estudio preliminar mediante difraccion de rayos x y microscopio electronico de barrido
O pervoj nahodke glubinnoj porody sloznogo sostava iz kimberlitovoj trubki Udacnaja. (Première trouvaille d'une roche de composition complexe provenant de la pipe de kimberlite Udacnaja)
Les processus d'érosion hypodermiques ou piping se développent tout particulièrement dans des zones semi-arides. 15 zones ont fait l'objet d' études morphologiques à des profondeurs variant entre 0 et 100 cm de profondeur. D'un point de vue
morphologique, la mise en terrasse des sols génère un gradient hydraulique important. Les résultats des analyses montrent que la présence de piping est liée aux changements de la structure et de la texture des sols, à différentes profondeurs ainsi qu'à des
Quantitative study of piping processes in badland areas of the Ebro Basin, NE Spain
Special issue, piping erosion
In the Ebro Basin, piping is an ubiquitous erosion process in badland areas, occuring in 2 main situations : on slopes of exposed Tertiary clays and in recently incised silty-clay Holocene valley-fill sediments. The quantitative importance
of the main factors controlling piping processes in those conditions was obtained by statistical analysis based on multiple and stepwise regressions. Piping erosion is strongly related to a high sodium absorption ratio (SAR) which favours clay dispersion
Badland ; Geomorphogenesis ; Gully erosion ; Mass movement ; Navarra ; Piping ; Rill wash ; Semi-arid area ; Soil erosion ; Soil properties ; Spain ; Water erosion
Bardenas Reales badlands are located in the middle-western sector of the Ebro Depression, northern Spain. Several erosion processes operate in the Bardenas Reales : rilling, gullying, piping and mass movements. The relative role played
favor piping, gullying and rilling during the rainfall maxima. Soil erodibility in this area is clearly controlled by the sodium content and the presence of swelling clays. These factors determine the distribution and appearance of piping processes
. Cracking in Holocene clay deposits, devoid of swelling clays, is related to high sodium content that confers a dispersive character. Clay dispersion causes loss of cohesion favoring piping.
On the formation of dissolution pipes in Quaternary coastal calcareous arenites in Mediterranean settings
). The wide set of vertical cone-shaped pipes found in these coastal areas can be defined as dissolution pipes. This paper deals with their morphological description. A large set of pipes has been measured (depth, top diameter) allowing to make some
Asian part of Russia ; Cold area ; Freeze-thaw cycle ; Geotechnics ; Impact ; Periglacial features ; Permafrost ; Pipe-line ; West Siberia
déplacement vers le haut par flottaison des pipes pauvrement lestés de ballast, dans des sols qui ont perdu leur portance. Les pipelines qui arrivent en surface sont alors exposés aux fluctuations saisonnières extrêmes des températures de l'air, glaçant le gaz
L'installation de gazoducs et de pipe-lines modifie le paysage naturel. Les conduites représentent un système multifonctionnel constitué de deux sous-systèmes en interaction : le corps de la conduite et le milieu environnant. Modifications de la
Improvements to the dispersion status of piped gully soils following reworking and stabilisation by vegetation
The physical and chemical properties of sodic gully bank soil material, deposited as in-channel sedimentary structures below a pipe system in alkaline marls, Colorado, were re-analysed for their dispersive status using a new methodology
Asia ; Economic flow ; Export ; Hydrocarbon ; International relations ; International trade ; Natural gas ; Natural resources ; Network ; Oil ; Pipe-line ; Soviet Central Asia ; Transport
Date 2009 ; Gaz naturel ; Géopolitique ; Kiiv ; Krym ; Mer Noire ; Pipe-line ; Politique ; Politique étrangère ; Révolution Orange ; Ukraine ; Union européenne
Black Sea ; Crimea ; European Union ; Foreign policy ; Geopolitics ; Kiev ; Natural gas ; Pipe-line ; Policy ; Ukraine