Discharge temperature-discharge rate correlation of Japanese hot springs driven by buoyancy and its application to permeability mapping

Details Discharge temperature-discharge rate correlation of Japanese hot springs driven by buoyancy and its application to permeability mapping Discharge temperature-discharge rate correlation of Japanese hot springs driven by buoyancy and its application to permeability mapping

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3310405m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 10, CiteID L10405

Physics

Geophysics

Hydrology: Groundwater Transport, Hydrology: Hydrogeophysics, Physical Properties Of Rocks: Permeability And Porosity, Volcanology: Intra-Plate Processes (1033, 3615), Geographic Location: Asia

Scientific paper

A bi-logarithmic plot of the discharge temperature versus flow rate of 3,686 hot springs in Japan shows a broad but positive correlation. This correlation is semiquantitatively explained as buoyancy-driven Darcy flow using a one-dimensional advection flow equation for hot water in a porous media assuming a 1 km reservoir depth and 104 m2 discharge area for each hot spring. The permeability of the best fit curve to the relation is 10-13 m2 that is a typical value for relatively low-temperature geothermal fields at a reservoir temperature less than 260°C. This is consistent with the relatively low reservoir temperature for these hot springs. Based on the relation, the permeability of each hot spring area can be estimated from the discharge temperature and discharge rate values, and permeability mapping for the 1 km skin depth is performed for almost all of Japan.

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