Article (Scientific journals)
Study of cavernous underground conduits in Nam La (Northwest Vietnam) by an integrative approach
Tam, V. T.; De Smedt, F.; Batelaan, Okke et al.
2005In Hydrogeology Journal, 13 (5-6), p. 675-689
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Keywords :
Karst; carbonate rocks; lineament; Tracer test; Vietnam
Abstract :
[en] This paper presents the result of an investigation of underground conduits, which connect the swallow holes and the resurgence of a blind river in the tropical, highly karstified limestone Nam La catchment in the NW of Vietnam. The Nam La River disappears underground in several swallow holes near the outlet of the catchment. In the rainy season this results in flooding upstream of the sinkholes. A hypothesis is that the Nam La River resurges at a large cavern spring 4.5 km east of the catchment outlet. A multi-thematic study of the possible connections between the swallow holes and the resurgence was carried out to investigate the geological structure, tectonics, cave structure analysis and discharge time series. The existence of the underground conduits was also tested and proven by tracer experiments. On the basis of a lineament analysis the location of the underground conduits were predicted. A remote sensing derived lineament-length density map was used to track routes from the swallow holes to the resurgence, having the shortest length but highest lineament density. This resulted in a plan-view prediction of underground conduits that matches with the cave and fault development. The functioning of the conduits was further explained by analysing flooding records of a nearby doline, which turns out to act as a temporary storage reservoir mitigating flooding of the catchment outlet area.
Research center :
Aquapôle - ULiège
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Tam, V. T.;  Research Institute of Geology and Mineral Resources, Ministry of Natural Resources and Environment, Hanoi, Vietnam
De Smedt, F.;  Vrij Universiteit Brussel - VUB > Hydrology
Batelaan, Okke;  Vrij Universiteit Brussel - VUB > Hydrology
Hung, L. Q.;  Research Institute of Geology and Mineral Resources, Ministry of Natural Resources and Environment, Hanoi, Vietnam
Dassargues, Alain  ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Study of cavernous underground conduits in Nam La (Northwest Vietnam) by an integrative approach
Publication date :
2005
Journal title :
Hydrogeology Journal
ISSN :
1431-2174
Publisher :
Springer Science & Business Media B.V., New York, United States - New York
Volume :
13
Issue :
5-6
Pages :
675-689
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 January 2009

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