LAVA FLOWS INFLUENCE ON VALLEYS STRUCTURE AND RIVER NETWORK DEVELOPMENT

E. V. Lebedeva

doi:10.15356/0435-4281-2016-3-78-91

LAVA FLOWS INFLUENCE ON VALLEYS STRUCTURE AND RIVER NETWORK DEVELOPMENT

E. V. Lebedeva

https://doi.org/10.15356/0435-4281-2016-3-78-91

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Abstract

Observations in various volcanic regions revealed the features of the interaction of lava covers and river flows. The specific structure of the lava flows – the presence of lava tubes considerable length – leads to the fact that waterways can use these voids within the lava flow and in some cases watercourse continues under lava that filled his valley. As a result sometimes younger alluvium may lie not only above, but under more ancient lavas, as well as in their cavities. So it’s necessary to be careful to define the age of lavas and alluvium on their mutual bedding. New incisions on the surface of lava covers are formed not only in their marginal parts – on contact with the less resistant rocks that has been well studied, but also: 1) in embryonic valleys – downhill oriented fallings between lava flows, 2) above lava tubes in places of their roofs collapse and 3) in the cracks, which contribute to the concentration of underground waters.

Keywords

volcanic processes, lava flow, lava tube, embryonic valleys, waterfall, underlava drainage

About the Author

E. V. Lebedeva

Institute of Geography RAS
Russian Federation

Laboratory of geomorphology,

Moscow

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Review

For citations:

Lebedeva E.V. LAVA FLOWS INFLUENCE ON VALLEYS STRUCTURE AND RIVER NETWORK DEVELOPMENT. Geomorfologiya. 2016;(3):78-91. (In Russ.) https://doi.org/10.15356/0435-4281-2016-3-78-91