The fluid dynamics of expanding lava deltas

EPSRC：Jesse Taylor-West：EP/R513179/1当熔岩进入海洋时，熔岩扩散并凝固，形成一个新的陆架，被称为熔岩三角洲。在过去几年里，这类事件有许多重要的例子，特别是2018年在夏威夷的基拉韦厄和2021年在拉帕尔马的坎布雷·维埃贾。这些事件的物理原理很复杂，由于周围水相对于空气的密度较高，驱动力会发生变化，熔融材料的快速冷却会发生流变性变化。我们将建立连续体模型来捕捉主要的物理过程，并将对这些模型进行分析和数值积分，以产生可以与观测结果相比较的预测。

EPSRC : Jesse Taylor-West : EP/R513179/1When lava enters the ocean, the molten rock spreads out and solidifies, creating a new shelf of land known as a lava delta. There have been a number of significant examples of such events over the last few years, notably at Kilauea, Hawaii in 2018, and Cumbre Vieja, La Palma in 2021. The physics of these events are complex, with changes to the driving buoyancy force due to the higher density of the ambient water relative to air, and rheological changes occurring due to the rapid cooling of the molten material. We will formulate continuum models to capture the dominant physical processes and these models will be analysed and integrated numerically to yield predictions that can be compared with observations.