Combined model of conduit flow and eruption cloud for prediction of transition of eruption style

点击翻译按钮获取中文摘要

We have developed a 1-dimensional(1D) 2-phase conduit flow model and analyzed the stability of steady lava dome eruptions. Through this analysis, we have revealed the transition conditions from lava dome eruptions to explosive eruptions in response to pressure change at magma chamber. We have also investigated how the eruption conditions(pressure and velocity) at the vent depend on the crater shape during explosive eruptions on the basis of the quasi-1D conduit flow model. These results of eruption conditions at the vent based on the quasi-1D conduit flow model have been used as the vent conditions for the 3-dimensional eruption cloud model. As a result we have succeeded in predicting the condition for pyroclastic flow to generate(i. e., column collapse condition) during explosive eruptions.