Geometric Attributes of Polygonal Crack Patterns in Columnar Joints
Geometric Attributes of Polygonal Crack Patterns in Columnar Joints
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DOI：
10.1029/2020ea001457
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发表时间：
2020-09
影响因子：
3.1
通讯作者：
Y. Akiba;A. Takashima;A. Inoue;H. Ishidaira;H. Shima
中科院分区：
文献类型：
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作者：
Y. Akiba;A. Takashima;A. Inoue;H. Ishidaira;H. Shima
在柱状节理的露头表面上经常观察到有序的多边形裂纹图案。裂缝图案的几何形状和拓扑结构是由凝固熔岩在热耗散过程中的体积收缩引起的。在这项研究中，我们进行了现场测量的柱状节理在四个不同的网站，在日本的各种岩性，以了解其几何特征的地理和岩性的影响。无人机辅助摄影和基于计算机的图像分析使我们能够高精度地检查组成多边形的几何属性及其统计数据。这种方法揭示了多边形裂纹图案的几何形状和拓扑结构之间的关系。此外，我们建立了一个多边形面积和多边形的顶点数在每个研究地点之间的正相关性，无论岩性，或地理位置。这些结果与先前的调查研究一致，特别是基于淀粉的类似物实验。
A well‐ordered polygonal crack pattern is frequently observed on the outcrop surface of columnar joints. The crack pattern's geometry and topology result from the volume contraction of solidified lava during thermal dissipation. In this study, we conducted field measurements of columnar joints at four different sites with various lithologies in Japan to understand the influence of geography and lithological character on their geometric characteristics. Drone‐aided photography and computer‐based image analysis enabled us to examine the constituent polygons' geometric attributes and their statistics with high accuracy. This methodology revealed a relationship between the geometry and topology of the polygonal crack patterns. Moreover, we established a positive correlation between the polygon area and the number of vertices of a polygon at each study site, irrespective of lithology, or geographic position. These results are consistent with previous investigational studies, in particular starch‐based analog experiments.