estavelle
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English
Etymology
From French estavelle, which is in turn from l'Estavelle, a spring in Hérault. The place name may come from Occitan estable (“stable”) or estervel (“whirlpool”), though this is uncertain.[1]
Noun
estavelle (plural estavelles)
- (geology) A hole that may function as an ephemeral spring or a sinkhole, depending on hydrological conditions.
- 2002, Sandra Friend, Sinkholes, page 35:
- The water pressure within the earth can force a swallow hole to become a spring and vice versa. These reversible sinks, which geologists call by the French geologic term estavelle, change their direction of flow (swallow or discharge) based on fluctuations in the water table.
- 2004, Petar Milanovic, Water Resources Engineering in Karst, page 23:
- Depending upon the position of the groundwater level and hydrological conditions on the surface, an estavelle can function at one time as an intermittent spring and at another as a ponor (swallowhole).
- 2012 Summer/Haf, Gareth Farr, “Water environment”, in Natur Cymru: A Review of Wildlife in Wales, page 44:
- Furthermore, the filling and emptying should occur via an estavelle, or ephemeral spring, and there should be no surface water inlet or outlet.
See also
References
- ^ Bernard Gèze (1987) “Les mésaventures des sources de L'Estavelle et de L'Inversac en Languedoc Méditerranéen”, in International Journal of Speleology (in French), volume 16,