Water chemistry of Lake Quilotoa (Ecuador) and assessment of natural hazards

Aguilera, Eduardo; Chiodini, Giovanni; Cioni, Roberto; Guidi, Massimo; Marini, Luigi; Raco, Brunella

doi:10.1016/s0377-0273(99)00168-7

Cited by 26 publications

(32 citation statements)

References 18 publications

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“…The density of an aqueous solution, ρ s (g/cm 3 ), at a given temperature, is linked to the density of pure water, ρ w , (Keenan et al, 1969) by means of the following relationship (Aguilera et al, 2000):…”

Section: Water Density In the Lake Avernomentioning

confidence: 99%

Geochemical and biochemical evidence of lake overturn and fish kill at Lake Averno, Italy

Caliro

Chiodini

Izzo

et al. 2008

Journal of Volcanology and Geothermal Research

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Section: Water Density In the Lake Avernomentioning

confidence: 99%

Geochemical and biochemical evidence of lake overturn and fish kill at Lake Averno, Italy

Caliro

Chiodini

Izzo

et al. 2008

Journal of Volcanology and Geothermal Research

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“…Nonetheless, CO 2 accumulation in Quilotoa is much less than in Lake Nyos. Compared with the data gathered by Aguilera in 1993 (Aguilera et al, 2000), lake water in 2003 is characterised by increased water temperature ( T =0.1 • C) and conductivity ( EC=600-700 µS cm −1 ), as well as by a drop in the water level of approx. 20 m (Fig.…”

Section: The Hazard Of Lake Quilotoamentioning

confidence: 75%

“…A further series of eruptions followed between 1725 and 1797. After the collapse of the dome during the first eruptive period, a crater lake developed, in which increased CO 2 concentrations have developed (Aguilera et al, 2000). Some limnic eruptions apparently took place in Lake Quilotoa in 1797, and today, a high risk of a similar future eruption must be taken into account Hall, 1991, 1998).…”

Section: Volcanic Lakes In Ecuadormentioning

confidence: 99%

Hazards of volcanic lakes: analysis of Lakes Quilotoa and Cuicocha, Ecuador

Gunkel

Beulker

Grupe³

et al. 2008

Adv. Geosci.

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Abstract. Volcanic lakes within calderas should be viewed as high-risk systems, and an intensive lake monitoring must be carried out to evaluate the hazard of potential limnic or phreatic-magmatic eruptions. In Ecuador, two caldera lakes -Lakes Quilotoa and Cuicocha, located in the high Andean region >3000 a.s.l. -have been the focus of these investigations. Both volcanoes are geologically young or historically active, and have formed large and deep calderas with lakes of 2 to 3 km in diameter, and 248 and 148 m in depth, respectively. In both lakes, visible gas emissions of CO 2 occur, and an accumulation of CO 2 in the deep water body must be taken into account.Investigations were carried out to evaluate the hazards of these volcanic lakes, and in Lake Cuicocha intensive monitoring was carried out for the evaluation of possible renewed volcanic activities. At Lake Quilotoa, a limnic eruption and diffuse CO 2 degassing at the lake surface are to be expected, while at Lake Cuicocha, an increased risk of a phreaticmagmatic eruption exists.

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“…However, there is still a deficit of knowledge on volcanic lakes, especially in the Andes of South America, even though this is a region with a great number of active volcanoes. In Ecuador, two lakes are known to be active volcanic lakes, the Quilotoa (AGUILERA et al, 2000;GUNKEL et al, 2008) and the Cuicocha (von HILLEBRANDT and HALL, 1988;GUNKEL et al, pers. com.…”

Section: Introductionmentioning

confidence: 99%

Limnology of the Crater Lake Cuicocha, Ecuador, a Cold Water Tropical Lake

Gunkel

Beulker

2009

International Review of Hydrobiology

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Cuicocha (3380 m a.s.l.) is a young, a few hundred years old volcanic lake in the western cordilleras of the Ecuadorian Andes with some post-volcanic activities, such as emission of volcanic gases and input of hydrothermal water. Water chemistry is influenced by the emission of CO 2 and weathering of the young andesitic rocks in the water shed. A calcium cycle exists in the lake with intensive biological Ca precipitation at the flanks and formation of travertine crusts, while in the hypolimnion dissolution of Ca carbonate occurs. The crater lake is oligotrophic, biodiversity is low; the littoral flora and fauna is more important than the pelagic species. In the littoral zone, a small Totora zone occurs, followed by submerged macrophytes down to 35 m water depth. Phyto-and zooplankton occur down into the hypolimnion. Phytoplankton is strongly influenced by down-welling of water (atelomixis) and by coprecipitation with detritial flocs.

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Water chemistry of Lake Quilotoa (Ecuador) and assessment of natural hazards

Cited by 26 publications

References 18 publications

Geochemical and biochemical evidence of lake overturn and fish kill at Lake Averno, Italy

Geochemical and biochemical evidence of lake overturn and fish kill at Lake Averno, Italy

Hazards of volcanic lakes: analysis of Lakes Quilotoa and Cuicocha, Ecuador

Limnology of the Crater Lake Cuicocha, Ecuador, a Cold Water Tropical Lake

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