References of "Ek, Camille"
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See detailLes sédiments détritiques des grottes : aperçu synthétique
Ek, Camille ULg; Quinif, Yves

in Annales de la Société géologique de Belgique (1988, September), 111

Clastic sediments in caves may be autochthonous or allochthonous. An overview of scientific works from 1966 to 1986 shows current trends. Energetic balance approach is promising.

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See detailLes concrétions carbonatées des grottes : aperçu synthétique
Gewelt, Michel; Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1988), 111

A synthetic overview of the scientific work on calcium carbonate cave deposits (dripstones and flowstones) over the last twenty years is carried out. More particularly, recent studies on speleothems ... [more ▼]

A synthetic overview of the scientific work on calcium carbonate cave deposits (dripstones and flowstones) over the last twenty years is carried out. More particularly, recent studies on speleothems composition, growth, age and paleoclimatic environment are examined. Main new results are in relation with the development of isotopic and radiometric dating methods which together with other research fields like palynology and tephrostratigraphy make speleothem a first choice material for the study of Late and Upper Quaternary. Beside geomorphological contributions — including Belgian results on maximum rates of valleys entrenchment and deepening — increasing number of dates allow for statistical speleothem repartition studies which could be related with paleoclimates. Two new frequency curves of U-series ages data of speleothems are presented. [less ▲]

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See detailSédimentologie de quelques loess de la grotte Walou à Trooz, Belgique
Chen, Zhiqing; Ek, Camille ULg; Lacroix, Daniel ULg

in Bulletin des Chercheurs de la Wallonie (1988), 28

Two silty sediments are present in Walou Cave. One includes few carbonates and is poorly sorted. The four other ones contains more carbonates, and are better sorted. They have different heavy minerals ... [more ▼]

Two silty sediments are present in Walou Cave. One includes few carbonates and is poorly sorted. The four other ones contains more carbonates, and are better sorted. They have different heavy minerals. The first sample is not a true loess; the other ones are reworked loesses. [less ▲]

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See detailThe significance of CO2 in the dissolution of limestone
Ek, Camille ULg

in Bulletin de la Société Belge d'Etudes Géographiques = Tijdschrift van de Belgische Vereniging voor Aardrijkskundige Studies (1988), 57(1), 110-112

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See detailCarbon dioxide of the air of shallow caves in mountainous areas
Ek, Camille ULg

in International Symposium on the Problems of Karst Study in Mountainous Countries (1987)

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See detailSite investigations on cavernous limestone for the Remouchamps Viaduct, Belgium
Waltham, Antony; Vandenven, Georges; Ek, Camille ULg

in Ground Engineering (1986), 19(8), 16-18

POOR GROUND CONDITIONS on cavernous limestone created severe difficulties at the sites of four piers of the Remouchamps Viaduct. The discovery, during excavations for foundations, of large open cavities ... [more ▼]

POOR GROUND CONDITIONS on cavernous limestone created severe difficulties at the sites of four piers of the Remouchamps Viaduct. The discovery, during excavations for foundations, of large open cavities prompted a major re-appraisal of site investigation procedure, and also some redesign of the viaduct structure. [less ▲]

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See detailLes remplissages des grottes: concrétions et dépôts détritiques. Aperçu synthétique
Ek, Camille ULg

in Jornadas sobre el Karst en Euskadi, Communicaciones (1986)

Synthetic overview of the twenty last years researches (1965-1985). Current trends. A new approach to the study of cave fills is based on the notion of energetic balance.

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See detailCarbon dioxide in cave atmospheres: new results in Belgium and comparison with some other countries
Ek, Camille ULg; Gewelt, Michel

in Earth Surface Processes & Landforms (1985), 10

More than 600 measurements of carbon dioxide in cave air in Belgium lead to the conclusion that the main factors of its distribution are: (1) a flow originating from the biomass and diffusing in the soil ... [more ▼]

More than 600 measurements of carbon dioxide in cave air in Belgium lead to the conclusion that the main factors of its distribution are: (1) a flow originating from the biomass and diffusing in the soil and the voids of bedrock; (2) a trend to go down by density; (3) in some caves, draughts caused, for instance, by a swift underground stream. Results in Belgium are compared to other countries. l'usage d'un masque absorbant le CO2Special attention is paid to human contamination and the use of a CO2-absorbing mask in defined situations is stressed. [less ▲]

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See detailDe la connaissance du milieu karstique à sa gestion
Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1985)

Progress in rational use of karst and its proper management is influenced by the exchange of relevant information in all the concerned spheres. It is also dependant on the setting up of global projects ... [more ▼]

Progress in rational use of karst and its proper management is influenced by the exchange of relevant information in all the concerned spheres. It is also dependant on the setting up of global projects involving a systemic approach. Impact studies are presented as a positive means of finding long term solutions to the land management of karst areas. This of course can only be achieved if the authors of the impact studies are neither dependant on nor controlled by the developers of a specific project. [less ▲]

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See detailKarstification souterraine en milieu saturé
Briffoz, Albert; Ek, Camille ULg; Gewelt, Michel

in Annales de la Société Géologique de Belgique (1985), 108

In order to explain the development of caves, considering the slowness of water circulations into the fissures of the limestone, only a chemical action i.e. corrosion can be called upon in most cases ... [more ▼]

In order to explain the development of caves, considering the slowness of water circulations into the fissures of the limestone, only a chemical action i.e. corrosion can be called upon in most cases. However, as saturation is rapidly reached, we consider, in order to extend the dissolution action of underground water, the possibility of dissolution in a saturated environment. [less ▲]

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See detailCarbon dioxide in cave atmospheres. New results in Belgium and comparison with some other countries.
Ek, Camille ULg; Gewelt, Michel

in Earth Surface Processes & Landforms (1985), 10

More than 600 measurements of the carbon dioxide content of cave air in Belgium lead up to the conclusion that the main factors of its distribution are: (1) a flow originating from the biomass and ... [more ▼]

More than 600 measurements of the carbon dioxide content of cave air in Belgium lead up to the conclusion that the main factors of its distribution are: (1) a flow originating from the biomass and diffusing in the soil and the voids of bedrock; (2) a trend, discernible in very still air only, to go down by density; (3) in some caves, draughts caused, for instance, by a swift underground stream. Results in Belgium are compared with published and unpublished data from other countries, showing that CO2 is often less abundant in cold climate caves and in caves of semi-arid regions (influence of the biomass). Special attention is paid to human contamination during analyses: the influence of people passing through the cave nearby the operator, but also the influence of the operator himself, are discussed, and the use of special precautions (including a CO2-absorbing mask) in defined critical situations is stressed. [less ▲]

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See detailQuantités de matières transportées en suspension et en solution par l'effluent majeur des karsts belges: la Meuse
Close-Lecocq, Jean-François; Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1985)

In the Meuse River at Liège, for a drainage basin of 16 400 sq km,the average annual suspended load is 388 000 tons and the load in dissolution 1 092 000 tons.

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See detailL'Evolution saisonière de la teneur en CO2 de l'air de deux grottes belges : Ste-Anne et Brialmont, Tilff
Gewelt, Michel; Ek, Camille ULg

in Paterson, K.; Sweeting, M.M. (Eds.) New directions in Karst (1983, September)

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See detailEsquisse d'une chronologie des phénomènes karstiques de Belgique
Ek, Camille ULg; Poty, Edouard ULg

in Revue Belge de Géographie (1982), 106(1), 73-85

Limestone formations in Belgium have always been subject to dissolution. In Devonian limestones, the oldest Belgian ones, the first karst phenomena occurred in Devonian times. Fossil caves dicovered in ... [more ▼]

Limestone formations in Belgium have always been subject to dissolution. In Devonian limestones, the oldest Belgian ones, the first karst phenomena occurred in Devonian times. Fossil caves dicovered in Devonian limestones display a Carboniferous marine fill. During Mesozoic, Dinosaurs were trapped in collapse dolines. Grints and karst depressions occurred in Tertiary times, whereas subhorizontal caves were dug out during Quaternary. To-day, in some places, swallowholes and dolines are evolving fast. [less ▲]

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See detailLa forte teneur en gaz carbonique de l'air d'une cavité du Québec: la grotte Saint-Léonard, île de Montréal
Ek, Camille ULg; Caron, Daniel; Roberge, Jean

in Naturaliste Canadien (1981), 108

St-Leonard Cave was closed during 11 years. When the cave was reopened, the CO2 content of the air was between 1600 and 3500 ppm. We investigated the evolution of the air during 7 months. The CO2 content ... [more ▼]

St-Leonard Cave was closed during 11 years. When the cave was reopened, the CO2 content of the air was between 1600 and 3500 ppm. We investigated the evolution of the air during 7 months. The CO2 content remained high. [less ▲]

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See detailLe gaz carbonique de l'air des grottes québécoises
Ek, Camille ULg

in Troisfontaines, Arlette (Ed.) Association canadienne des géographes. Réunion annuelle: résumés des communications (1980)

Some 200 measurements of carbon dioxide in underground air show the importance, in partial pressure variations, of the following factors: 1- vegetal activity; 2- site (hall, fissure, proximity of entrance ... [more ▼]

Some 200 measurements of carbon dioxide in underground air show the importance, in partial pressure variations, of the following factors: 1- vegetal activity; 2- site (hall, fissure, proximity of entrance...) Our measurements, the first ones in Quebec, display values of 1 or 2 mg CO2/l air and, in fissures, 2 to 5 mg/l and sometimes much more (normal value in open air: about 0.6 mg/l). [less ▲]

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See detailLes phénomènes karstiques dans les roches paléozoïques de la Belgique. Processus actuels, problèmes actuels
Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1979)

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See detailVariations saisonnières des teneurs en CO2 d'une grotte belge : le Trou Joney à Comblain-au-Pont
Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1979)

In winter, the CO2 content of the air of the cave is generally lower than 1 mg/l. In summer, it rises and becomes higher than 2 mg/l. The CO2 concentration is generally higher near the roof than near the ... [more ▼]

In winter, the CO2 content of the air of the cave is generally lower than 1 mg/l. In summer, it rises and becomes higher than 2 mg/l. The CO2 concentration is generally higher near the roof than near the basement and higher at the far bottom of the hole than in the entrance zone. The seasonal rythm is obvious. [less ▲]

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See detailVitesse de dissolution du calcaire sous l'effet de la fonte de la neige: expérience en milieu naturel
Morel, Raymond; Kupper, Miriam; Ek, Camille ULg

in Spéléo-Québec (1979), 5-6

Four samples of limestone were set in snow in various natural environments during one month at the end of winter. Dissolution was variable, but faint. Melting snow is not very aggressive.

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