References of "Ek, Camille"
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See detailVariations saisonnières du CO2 de l'air de deux grottes du Jura méridional: La Balme et Cerdon. Comparaison avec d'autres grottes françaises
Sbai, Abdelkader; Ek, Camille ULg; Renault, Philippe

in Annales de la Société Géologique de Belgique (1996), 119

Seasonal measurements of carbon dioxide were made over a period of one year in two caves from southern Jura: the caves of La Balme and of Cerdon. Carbon dioxide contents range from 300 to 15,500 ppm ... [more ▼]

Seasonal measurements of carbon dioxide were made over a period of one year in two caves from southern Jura: the caves of La Balme and of Cerdon. Carbon dioxide contents range from 300 to 15,500 ppm; these low values are correlated with the circulation of the air in the two caves and with the origin of the carbon dioxide. The values found in these caves are then compared with those measured by researchers in other French caves. [less ▲]

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See detailGrottes et rivières des régions calcaires
Ek, Camille ULg

in Demoulin, Alain (Ed.) L'Ardenne, Essai de Géographie physique. Hommage à A. Pissart (1995)

Location of soluble rocks and karstic areas. Morphology of closed depressions. Valleys of limestone regions; dry valleys; blind valleys. Caves. Present-day processes.

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See detailLes roches karstifiables de la Province de Hainaut
Ek, Camille ULg

in De Broyer, Claude (Ed.) Atlas du Karst wallon, Province de Hainaut (1995)

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See detailLes calcaires de Wallonie
Ek, Camille ULg

in Atlas du karst wallon : Province de Namur (1992)

Inventory and description of karstic features of Namur Province

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See detailLa nouvelle grotte de Dinant
Ek, Camille ULg

Book published by Lesire (1990)

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See detailMorphology. Mapping the genesis of the Flying Dragon
Ek, Camille ULg

in Masschelein, J.; Zhang, Shouyue (Eds.) Teng Long Dong, the longest cave of China (1990)

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See detailDes traces de glace de ségrégation dans la grotte de Remouchamps (Belgique) : conséquences en ce qui concerne la sédimentation et la paléoclimatologie
Pissart, Albert ULg; Van Vliet-Lanoë, Brigitte; Ek, Camille ULg et al

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

In countries with a modern temperate climate, the extent of former permafrost is generally estimated from the observation of ice wedge casts, remnants of pingos and palsas, and periglacial involutions ... [more ▼]

In countries with a modern temperate climate, the extent of former permafrost is generally estimated from the observation of ice wedge casts, remnants of pingos and palsas, and periglacial involutions. These features give no indication at all about the depth of permafrost and are ineffective in identifying the limits of former permafrost. A new tool for this research may be found in caves. We already know that speleothems did not grow -- or grew little — during the colder periods of the last glaciation, probably because of the impervious nature of the frozen ground. The discovery, in the Remouchamps Cave, of the marks of segregation ice in loose fills proves that the temperature did fall below 0°C. Only one cycle of freeze/thaw would have been sufficient to create these marks wich have been preserved because there was indeed little biological activity in this environment. The temperature in such caves is generally very close to the mean annual temperature outside the caves. This evidence will thus be useful for tracing the southern limit of the permafrost in Europe. When the permafrost thawed, the melting of the ice caused mass movements in the cave sediments. The ice had blocked some passages and water levels rose to abnormally high levels, depositing sediments at these levels. [less ▲]

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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 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 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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