Litostratigrafie en hydraulische doorlatendheid van het freatisch reservoir te de Panne. (The lithostratification and the hydraulic conductivity of the unconfined aquifer at De Panne, Belgium)
20 sondages hydrogéologiques permettent de faire une coupe lithostratigraphique et une estimation de la conductivité hydraulique. La nappe phréatique est nettement stratifiée.
Hydraulic conductivity of a swelling clay in relation to irrigation water quality
Aménagement hydraulique ; Argile ; Conductivité hydraulique ; Eau du sol ; Géographie physique ; Humidité du sol ; Hydrologie ; Irrigation ; Qualité de l'eau ; Sol ; Taux hygrométrique
Evaluation de l'effet de la qualité du sol sur la conductivité hydraulique non saturée d'un sol argileux d'un taux hygrométrique de 0,18 = 0,30 g/g. Le modèle de stabilité de la structure poreuse proposée par Cass et Sumner (1982) pour les systèmes
Estimating unsaturated hydraulic conductivity from easily measured soil properties
Belgique ; Conductivité hydraulique ; Géographie physique ; Hydrodynamique ; Méthodologie ; Propriété du sol ; Pédologie ; Sol
The authors measured hydraulic conductivity (saturated and unsaturated) on 127 soil cores, which were taken in different horizons of a wide variety of Belgian soil series. The hot air method and the crust method were combined to obtain the complete
range of hydraulic conductivity from saturation to air-dry. Regression equations for estimating the Gardner parameters were established from simple soil properties, such as soil texture, carbon content, bulk density. Three parameters can reasonably well
be estimated from the textural composition and the saturated hydraulic conductivity.
Salt effect on hydraulic conductivity of a vertisol
Argile minéral ; Conductivité hydraulique ; Géochimie ; Géographie physique ; Salinité ; Sol ; Sol salin ; Vertisol
The changes in saturated hydraulic conductivity, macroscopic swelling and clay dispersivity of a sodic black clay soil in relation to solution concentration and Na adsorption ratio of the percolating solution were measured. Based on the threshold
concentration curves, an empirical relationship relating saturated hydraulic conductivity and soil solution properties has been derived for vertisols and its field applicability established. For all practical purposes, swelling of clay seemed to be the major
factor responsible for loss of saturated hydraulic conductivity of a sodic vertisol.
La relation entre la conductivité hydraulique saturée et la texture des dépôts morainiques de Holderness a été étudiée in situ. Le coefficient de corrélation de Spearman, établi avec la teneur en silt moyennement grossier, est positif, alors qu'il
est négatif avec la teneur en sables fins et moyennement fins. L'A. suggère que le silt aurait favorisé la formation d'une structure prismatique de dessiccation dans les dépôts morainiques, qui aurait augmenté la conductivité hydraulique
The AA. argue that the premise on which the peat mound model developed by Armstrong (1995) is based, that hydraulic conductivity shows an exponential decline with depth in bog peats, is unsound. Empirical evidence in the literature
A preliminary survey of the hydraulic properties of rainforest soils in tropical north-east Queensland and their implications for the runoff process in Rainfall simulation, runoff and soil erosion.
Activité biologique ; Australie ; Averse ; Conductivité hydraulique ; Cycle de l'eau ; Forêt ; Géographie de l'Océanie ; Propriété hydraulique ; Queensland ; Relation pluie-débit ; Sol ; Sol podzolique ; Zone intertropicale
L'A. démontre qu'une activité biologique intense dans l'horizon supérieur (0-10 cm) permet le stockage de l'eau d'averses très intenses. De telles conditions peuvent aussi s'appliquer à la couche0-20 cm malgré une diminution de la conductivité
Conductivité hydraulique ; Géographie physique ; Indice pédologique ; Pédogenèse ; Tourbière ; Tourbière basse ; Utilisation du sol
Soil development as induced by drainage and agricultural land use implies changes of the properties of low-bog sites. Crude ashes bulk density, dry matter volume increase| hydraulic conductivity decreases. These characteristics served
A model has been built to simulate runoff and erosion on slopes of varying form with soil of varying hydraulic conductivity, porosity, storage capacity, and particle size distribution. The model takes into account spatially dependent random
Conductivité hydraulique ; Dynamique de versant ; Eau du sol ; Granulométrie ; Hydrologie ; Minéralogie ; Modèle ; Mouvement de masse ; Propriétés du sol ; Versant
The AA. introduce a new analytical method for determining hydraulic conductivity (K) derived from percentages of the mineralogical structure constituents. They incorporate this method within a hydrology-slope stability model structure and develop
Soil hydraulic properties and their effect on surface and subsurface water transfer in a tropical rainforest catchment
surface, variations spatiales de la conductivité hydraulique du sol en profondeur. Ces facteurs contrarient ou non l'écoulement subsuperficiel et l'infiltration. (RF).
Particle size, pore size distribution and saturated hydraulic conductivity of the horizons of six soil profiles in southern Bavaria derived mainly from loess over sandy, gravelly sediments and showing varying degrees of pseudogleization were
Canada ; Conductivité hydraulique ; Eau du sol ; Erosion des sols ; Erosion hydrique ; Expérimentation ; Modèle ; Ontario ; Propriétés du sol ; Précipitation
This study describes an attempt to design and construct systems capable of measuring soil water content, soil water potential, water flux, and hence (indirectly) soil hydraulic conductivity in a laboratory. The experimental results indicate
les principaux sous-bassins de l'Aragón, au cours de trois campagnes en hiver et deux en été. Les concentrations de sédiments en suspension, la conductivité électrique comme expression de sédiments en solution et le pH ont été analysés. Les plus
Complex confining layers. A stochastic analysis of hydraulic properties at various scales
This volume presents a study of the problem of characterizing the hydraulic properties, i.e. hydraulic conductivity and effective porosity, and ground water flow of complex confining layers at various scales. The study has shown that it is possible
to derive representative hydraulic properties at the scale of model blocks, from hydraulic properties measured at the score scale. - (AGD)
A partial explanation of the dependency of hydraulic conductivity on positive pore water pressure in peat soils
Part of the relationship between positive pore water pressures and hydraulic conductivity in peat soils may be explained by accumulations of methane bubbles. The AA. show how compression and expansion of gas bubbles with changes in pore water
pressure could cause changes in hydraulic conductivity and thus help to explain some observations of dependency of hydraulic conductivity in peats on pore water pressure. Consideration is also given to the effect on hydraulic conductivities of methane gas
Hydraulics of interrill overland flow on rough, bare soil surfaces
A set of laboratory experiments on bare, rough soil surfaces was carried out to study the relationship between soil surface roughness and its hydraulic resistance. A new model is developed to predict the hydraulic resistance of the surface, based
on detailed surface roughness data. Roughness profiles perpendicular to the flow are used to calculate the wet cross-sectional area and hydraulic radius given a certain water level. The algorithm of Savat is then applied to calculate the hydraulic resistance
Hydraulics of sediment-laden sheetflow and the influence of simulated rainfall
This paper evaluates and compares hydraulic characteristics in flows with and without rainfall disturbance. The spatial uniformity of simulated rainfall properties, and its significance to flow hydraulics, are also discussed.