inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (1930 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Impact of plant cover on heat and water balance in agricultural landscapes located in humidity gradient
  • Agroclimatology ; Agroecosystem ; Bioclimatology ; Ecosystem ; Heat balance ; Plant cover ; Vegetation ; Water balance
  • Investigation on heat and water balance in agricultural landscape were carried out of for six years. The impact of plants cover and habitat moisture on structure of heat and water balances was studied. Observations of micrometeorological parameters
  • were carried out during field expedition using the system of automatic measurement and recording. Temporal and spatial characteristics of heat and water balances in different ecosystem located in different climatic zones were analysed. - (DG)
  • Water balance computations for larger regions based on calibrated models of gauged catchments
  • Applied hydrology ; Belgium ; Catchment area;Watershed ; Flanders ; Mathematical model ; Water balance ; Water management
  • In an attempt to explore the boundary conditions for water management in Flanders, water balance computations are carried out for the Flemish Region, and for 27 geographical subregions as defined in the General Water Treatment Scheme of the Flemisch
  • Government. In a first phase more than 50 gauged catchments are studied. The hydrological and hydrometeorological data collected during the past 40 years are incorporated in the study. A lumped system mathematical model, WABAM (Water Balance Model
  • ), calculating the major terms of the water balance on a monthly time base, is calibrated for these catchments. The regional variation in the water balance is analysed, which allows for an extrapolation of the results over larger geographical units. - (Les AA.).
  • A new climate and water-balance station on the Peninsula Skallingen, South West Jutland
  • Climatic data ; Denmark ; Jylland ; Meteorology ; Microclimate ; Salt marsh ; Water balance
  • In March 1997 an automatic climate and water balance station was established on the peninsula Skallingen, 55°30'N, 8°15'E. The data can be retreived by a cellular phone and a modem. The station and selected data are described.
  • An analysis of the atmospheric water balance over the southern hemisphere
  • Atmosphere ; Atmospheric disturbance ; Atmospheric moisture ; El Niño ; Southern hemisphere ; Water balance ; Water cycle
  • An analysis of the atmospheric water balance over the Southern Hemisphere is conducted for the time period June 1980 through May 1984 that includes the 1982-1983 El Niño event. Notable spatial and temporal variations are evident in the moisture flux
  • divergence fields, in the mean meridional transport of water vapor, and in the moisture content of portions of the tropical atmosphere that are attribuable to the 1982-1983 ENSO event. Estimates of the net gain/loss of atmospheric water are provided for 10
  • Classification of climate of Vietnam based on the heat and water balances
  • Classification ; Climate ; Heat balance ; Taxonomy ; Vietnam ; Water balance
  • The objective of this study is to establish the climatological classification of Vietnam, based on the structure of heat and water balances. Data from 85 meteorological stations, for the period 1960-1975 were taken into account for determining mean
  • Regionalisation of physically-based water balance models in Belgium. Application to ungauged catchments
  • Belgium ; Catchment area;Watershed ; Model ; Water balance ; Water resources
  • More than 60 catchments from Northern Belgium ranging in size from 16 to 3 160 km2 have been studied by means of a physically-based stochastic water balance model. The parameter values derived from calibration of the model were regionally mapped
  • Assessment and utilization of soil water resources
  • Agriculture ; China ; Groundwater ; Irrigation ; Northern China ; Water ; Water budget ; Water management ; Water resources
  • Based on the analyses of water interactions and water balance, this paper discusses the issues on the assessment and regulation of soil water resources, which lays the scientific basis for limited irrigation and water-saving agriculture.
  • Summer water balance characteristics of Koryto Glacier, Kamchatka Peninsula, Russia
  • Asian part of Russia ; Glacial ablation ; Glacier ; Kamchatka ; Meltwater ; Summer ; Water budget
  • The AA. first determine summer water balance of Koryto Glacier based on field observations in 2000, and show that drainage of large quantities of stored water occurred during this summer. Then, they evaluate the relative importance of subglacially
  • stored water to the total storage change, and estimate the volume of contracted subglacial cavities based on measurements of vertical displacements of the glacier surface. Finally, the AA. estimate the water balance during the entire ablation season
  • , and compare it with water balances of glaciers under maritime and other climatic conditions.
  • Simulation of land use changes an impacts on the water balance - a case study for Belgium
  • Belgium ; Catchment area;Watershed ; Hydrology ; Land use ; Vegetation ; Water balance
  • Water balance and water resources of the Aral Sea basin and its Man-induced changes
  • Aral Region ; Degradation ; Former USSR ; Human impact ; Sea level ; Soviet Central Asia ; Stream flow ; Water ; Water balance ; Water resources
  • . Shows up the tendences of structural changes and efficiency of water resources usage of the region, presents their present-day spacial-geographical peculiarities. On the basis of temporal analysis of water balance structure of the Aral Sea, a conclusion
  • This paper presents natural-climatological characteristics of water resources forming conditions of the Aral sea basin. Analises flow variability correlation of Amy Darya and Syr Darya from the point of their influence on the sea level fluctuation
  • An analysis of heat and water balances in West Africa
  • By use of empirical models, the required heat-and water-balance parameters were derived from readily available meteorological data. Spatial patterns of the mean annual values of the heat-and water-balance components are discussed, and necessary maps
  • Water and soil resource conservation and utilization on the northwest side of Mount Kenya
  • Forest ; Hydrology ; Kenya ; Land use ; Water balance ; Water cycle;Water circulation ; Water resources
  • balance of the Naro Moru Basin and water conservation in the foothills of Kalala and Matanya.―(DWG)
  • The forest belt between 2 400 and 3 500 m on Mt. Kenya is important for the supply of perennial water to streams and recharge of the groundwater table in the semi-arid plateau below. Two scales are used to study the interrelationships : water
  • Using vertical aerial photography to estimate mass balance at a point
  • Special issue : Methods of mass balance measurements and modeling
  • Aerial photography ; Glacier ; Glacier mass balance ; Glaciology ; Methodology ; Photogrammetry ; United States of America ; Washington State
  • balance components are in water equivalent units.
  • This report describes a method of using photogrammetric results and compares the estimated mass balances with the independently measured true values. In this report, altitudes are measured from the National Geodetic Vertical Datum of 1929, and mass
  • Impacts of human activities on water cycles in Haihe basin
  • China ; Human impact ; Impact ; Phreatic ground water ; Water balance ; Water cycle ; Water pollution ; Water quality ; Water use ; Watershed
  • This paper studies effects of human activities on water cycle in Haihe basin, focusing on the effects on the key elements of water balance and environmental issues caused by unreasonable water development and utilization. River runoff reduction
  • , groundwater over-exploitation, and water pollution have caused a series of environmental problems in the area. The best way to meet increasing water demands of human activities is to raise efficiency of water resources use. Waste water discharge should
  • Wasserhaushalt und Gewässer. Festschrift zum 60. Geburtstag von Professor Dr. Reiner Keller.. (Waters and water balance. Publication in honour on the occasion of the 60th birthday of Professor Reiner Keller)
  • Water balance types and water resource development in the dry zone of Sri Lanka
  • Water balance analysis for Ghana
  • A comparison of two river basins, the Limnitis and Evdhimou, using the water balance and drainage basin morphometric techniques
  • Atmospheric moisture transport and the water balance of the Mediterranean Sea
  • Water use and millet production in the Sahel
  • Africa ; Arid area ; Biomass ; Drought ; Evapotranspiration ; Land use ; Model ; Sahel ; Water balance ; Water use
  • to the importance of properly understanding the water balance in the Sahel, and the relationship between biomass production and transpiration is discussed. A method for estimating transpiration from a heterogeneous vegetation cover is tested.
  • Water-avaibility is an important and often critical factor for plant-production in the Sahel. The most important crop of this region is millet, which has a low water requirement and a high resistance to drought. In this article attention is drawn