Abstract
Few studies have addressed the runoff mechanism in volcanic basins, because the flood discharge in such basins tends to be small. However, after volcanic eruptions it is important to review therunoff characteristics of the basin, because eruptions can profoundly alter the runoff mechanism. This study analyzes the runoff mechanism during rainfall in an experimental basin at Volcano Tarumae, according to field survey results. We reached these conclusions: 1) The runoff in the upper part of a basin is composed of runoff from areas adjacent to the river channel and large-scale groundwater runoff (mainly spring water at the riverhead). 2) Changes in rainfall have little influence on the runoff source area. 3) The discharge of spring water depends on average rainfall intensity and ground moisture in thebasin.
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