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Résultats de la recherche (16 résultats)

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  • Soil erosion by piping in irrigated fields
  • Special issue, piping erosion
  • The purposes of this paper are to point out the factors encouraging piping in irrigated soils of La Rioja, to show the effects on soil and nutrient losses in a field affected by piping during each irrigation and throughout the year, and to obtain
  • an annual rate of soil erosion by piping.
  • 1997
  • Factors controlling the distribution of piping in Britain : a reconnaissance
  • Special issue, piping erosion
  • The distribution of piping in Britain has been studied from a survey of 74 piped basins, and a number of in-depth studies at the individual basin scale. This was undertaken to determine the factors controlling the distribution of piping at 2 scales
  • 1997
  • Piping causing thermokarst in permafrost, Ungava Peninsula, Quebec, Canada
  • Special issue, piping erosion
  • The aim of this short note is to describe an observation of rather unusual piping in an ice wedge from the continuous permafrost region in northernmost Quebec (mean annual temperature about -6°C). The hydrology of permafrost and its importance
  • 1997
  • The significance of soil piping processes : inventory and prospect
  • Special issue, piping erosion
  • as a collection of papers on piping. However, it is clear from the reviews cited that this term has been used to cover a considerable range of subsurface erosion features formed by different processes. A brief clarification is needed, there are 2 types
  • of subsurface erosion apart from solution : true piping in the engineering sense and tunnel erosion.
  • 1997
  • An experimental study on the burrowing activity of river crabs on subsurface water movement and piping erosion
  • Special issue, piping erosion
  • In this study, the effect of burrowing activity on subsurface water movement and piping erosion was studied in a flume experiment using cohesive soil. This laboratory observation on the interaction of burrowing activity of river crabs and subsurface
  • 1997
  • Sinkholes formed by piping into buried channels
  • Special issue, piping erosion
  • Piping-induced sinks in flood-irrigated alfafa fields on the distal part of a compound alluvial fan in California's Central Valley lack discharge conduits. It is suggested that all inflow and sediment are dispersed underground in former distributary
  • 1997
  • 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
  • 1997
  • Coopération économique ; Développement régional ; Eurasie ; Géopolitique ; Mer Noire ; Mutation politique ; Pipe-line ; Projet ; Pétrole ; Relations internationales
  • Black Sea ; Economic cooperation ; Eurasia ; Geopolitics ; International relations ; Oil ; Pipe-line ; Political reform ; Project ; Regional development
  • 1997
  • Energie ; Exportation ; Gaz naturel ; Investissement ; Pipe-line ; Projet ; Russie d'Asie ; Sibir'
  • Asian part of Russia ; Energy ; Export ; Investment ; Natural gas ; Pipe-line ; Project ; Siberia
  • une compagnie privée russe. Transfert de ces droits au cours de la restructuration industrielle. Détail des plans de 1997, structurés par les thèmes de la structure énergétique régionale et les prévisions de la demande de gaz en Chine et en Asie
  • 1997
  • Caspienne ; Droit maritime ; Dégradation de l'environnement ; Energie ; Eurasie ; Ex-URSS ; Exploitation rationnelle ; Gaz naturel ; Gestion des ressources ; Géopolitique ; Hydrocarbure ; Mer ; Pipe-line ; Réserves énergétiques ; Trafic maritime
  • Caspienne Sea ; Energy ; Energy reserve ; Environmental degradation ; Eurasia ; Former USSR ; Geopolitics ; Hydrocarbon ; Maritime law ; Maritime traffic ; Natural gas ; Pipe-line ; Rational use ; Resource management ; Sea
  • 1997
  • Action anthropique ; Carrière ; Hongrie ; Karst ; Pipe-line ; Pollution ; Protection de l'environnement ; Qualité de l'eau ; Réseau de drainage
  • Drainage network ; Environmental conservation ; Human impact ; Hungary ; Karst ; Pipe-line ; Pollution ; Quarry ; Water quality
  • 1997
  • Azerbaïdjan ; Caspienne ; Caucase ; Economie régionale ; Energie ; Ex-URSS ; Gaz naturel ; Géopolitique ; Kazakhstan ; Pipe-line ; Pétrole ; Turkménistan ; Turquie
  • Azerbaydzhan ; Caspienne Sea ; Caucasus ; Energy ; Former USSR ; Geopolitics ; Kazakhstan ; Natural gas ; Oil ; Pipe-line ; Regional economy ; Turkey ; Turkmenistan
  • 1997
  • which draw on previous work and continuing studies. The processes influencing gully and channel head morphology are then discussed including overland flow, hillslope processes, pipe initiation and enlargement, mass failures and the magnitude
  • 1997
  • photographs between 1930 and 1992. Larger gullies continue to expand over time while small gullies are more likely to become stable. Growth rates increased between 1955 and 1978. After 1970, efforts to rehabilitate gullies using drain pipes and check dams
  • 1997