Dropstone deposition: Results of numerical process modeling of deformation structures, and implications for the reconstruction of the water depth in shallow lacustrine and marine successions
Dropstone deposition: Results of numerical process modeling of deformation structures, and implications for the reconstruction of the water depth in shallow lacustrine and marine successions
复制标题
落石沉积：变形结构数值过程模拟的结果以及对浅湖和海洋序列水深重建的影响
DOI：
10.2110/jsr.2020.111
复制
发表时间：
2021
影响因子：
2
通讯作者：
A. J. Loon
中科院分区：
文献类型：
--
作者：
M. Bronikowska;M. Pisarska‐Jamroży;A. J. Loon
湖泊和海洋沉积物中的落石具有多种尺寸：从小于一毫米到数米。它们的大小和形状决定了它们在水柱中沉降时的速度和加速度，而这反过来又原则上决定了它们在底部沉积物中留下的印记。尽管这些参数对于落石沉积至关重要，但底部沉积物的未知材料（沉积物）特性（如强度、孔隙率、孔隙水含量、粘度等）在此过程中与水深一样重要，水深在物理上可以理解为撞击前垂直穿过致密介质的路径长度。因此，重建落石坠落和沉积时的主要环境条件需要考虑影响落石最终印记深度的各种因素，并结合多种数值方法。
在这里，我们展示了不同尺寸的落石通过不同深度的水柱沉降的数值模拟结果。我们的研究结果表明，环境因素如何控制落石撞击过程中沉积表面形成的变形结构，以及沉降落石造成的印记有多深。
Dropstones in lacustrine and marine sediments show a wide range of sizes: from less than a millimeter to many meters. Their size and shape determine the velocity and the acceleration when they settle through the water column, and this, in turn, determines in principle the imprint that they make in the bottom sediment. Although these parameters are crucial for dropstone deposition, the unknown material (sediment) properties (like strength, porosity, pore-water content, viscosity, etc.) of the bottom sediment play a just as important role in this process as the water depth, which can physically be understood as the length of the pathway traveled vertically through a dense medium before the impact. Reconstruction of the principal environmental conditions at the time of dropstone fall and deposition consequently requires considering the variety of factors affecting the final imprint depth of a dropstone, the combination of several numerical methods.
Here, we show the results of numerical modeling of dropstones with different sizes that settle through water columns with different depths. Our results show how environmental factors control the deformation structures formed at the sedimentary surface during the impact of a dropstone, and how deep the imprint caused by the settling dropstone will be.
影响因子：
2.9
作者：
M. Pisarska‐Jamroży;Szymon Belzyt;A. Börner;G. Hoffmann;H. Hüneke;M. Kenzler;K. Obst;H. Rother;A. V. van Loon
通讯作者：
M. Pisarska‐Jamroży;Szymon Belzyt;A. Börner;G. Hoffmann;H. Hüneke;M. Kenzler;K. Obst;H. Rother;A. V. van Loon
区分冰下和冰前湖泊沉积物：德国北部丹尼斯沃尔德半岛的一个例子
影响因子：
4
作者：
Livingstone S
通讯作者：
Livingstone S