Reference : Study of cavernous underground conduits in Nam La (Northwest Vietnam) by an integrati...
Scientific journals : Article
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/3307
Study of cavernous underground conduits in Nam La (Northwest Vietnam) by an integrative approach
English
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 mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement >]
2005
Hydrogeology Journal
Springer Science & Business Media B.V.
13
5-6
675-689
Yes (verified by ORBi)
International
1431-2174
New York
NY
[en] Karst ; carbonate rocks ; lineament ; Tracer test ; Vietnam
[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.
Aquapôle - AQUAPOLE
Researchers ; Professionals
http://hdl.handle.net/2268/3307
10.1007/s10040-005-0452-7
http://www.springerlink.com/content/r624h419q605p8x8/?p=5e5514df88c94e99a21218b95eb0028e&pi=2
We acknowledge Springer. The original paper can be found on www.springerlink.com

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