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首页> 外文期刊>Journal of Volcanology and Geothermal Research >A fluid dynamic model of volcaniclastic turbidity currents based on the similarity with the lower part of dilute pyroclastic density currents: Evaluation of the ash dispersal from ash turbidites
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A fluid dynamic model of volcaniclastic turbidity currents based on the similarity with the lower part of dilute pyroclastic density currents: Evaluation of the ash dispersal from ash turbidites

机译：基于与稀火山碎屑密度流下部相似性的火山碎屑浊流的流体动力学模型：灰浊中灰分扩散的评估

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摘要

Subaqueous sediment density currents have variable flow structures, depending on particle size and volumetric concentration. They form both in ocean basins and in volcanic districts, where subaqueous density currents are generated by collapse of slope and primary pyroclastic material entering the sea, respectively. A particular type of such flows is represented by volcaniclastic turbidity currents, which form by the subaqueous remobilization of primary pyroclastic deposits. In this work, a fluid dynamic model of volcaniclastic turbidity currents is presented and applied to the currents that generated the Craco (Southern Italy) volcaniclastic deposits. The deposits consist of thick laminated to massive beds, which formed from the remobilization of thin fine-ash pyroclastic fall deposits, in an area far away from the original volcanic source. Our model is based on the sedimentological features of the deposits and particle physical characteristics. It allows the calculation of velocity, thickness and Reynolds number of the currents. Furthermore, a relationship between the current thickness, laminae thickness and paleo-slope angle is obtained, which allows to evaluate the thickness of the primary pyroclastic fallout deposits. Our model can be useful for obtaining an estimation of the primary distal ash dispersal by the characteristics of the associated subaqueous volcaniclastic deposits.
机译：水下沉积物密度流具有可变的流动结构，具体取决于粒径和体积浓度。它们在海盆和火山区中形成，在水下区，分别由进入海面的斜坡和主要的火山碎屑物质的塌陷产生水下密度流。这种流动的一种特殊类型是火山碎屑浊流，它是由一次火山碎屑沉积物在水下的流动形成的。在这项工作中，提出了火山碎屑浊流的流体动力学模型，并将其应用于产生Craco（意大利南部）火山碎屑沉积物的电流。这些沉积物由厚的层压成块状的床层组成，这些床层是由远离原始火山源的薄粉状火山灰碎屑秋季沉积物的迁移形成的。我们的模型基于沉积物的沉积学特征和颗粒物理特征。它允许计算电流的速度，厚度和雷诺数。此外，获得了当前厚度，层流厚度和古坡角之间的关系，从而可以评估一次火山碎屑沉积沉积物的厚度。我们的模型可用于通过相关的水下火山碎屑沉积物的特征获得对远侧主要灰分扩散的估计。

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