Decimeter-scale in situ mapping of modern cross-bedded dune deposits using parametric echo sounding: A new method for linking river processes and their deposits
Decimeter-scale in situ mapping of modern cross-bedded dune deposits using parametric echo sounding: A new method for linking river processes and their deposits
复制标题
使用参数回声探测对现代交错层状沙丘沉积物进行分米级原位测绘：一种连接河流过程及其沉积物的新方法
DOI：
10.1002/grl.50703
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
Sambrook Smith G
中科院分区：
文献类型：
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作者：
Sambrook Smith G
收集高分辨率数据以量化当代冲积河道内的沉积结构仍然是河流沉积学中的突出挑战之一。在这里，我们介绍了使用一种新的地球物理方法收集的数据，参数回声测深仪(PES)，它可以满足这一挑战。通过对阿根廷里奥巴拉那一片沙丘的调查，我们展示了PES以分米分辨率成像活跃河道内地下结构的独特能力。这些数据揭示了沙洲和沙丘之间的边界面，以及沙洲和沙丘之间的前震和复活面。这为最近的研究提供了定量的现场数据，这些数据表明，沙丘保存的跨层可能更多地与水流深度有关，而不是通常假设的河滩水位。这些调查表明，PES可以提供迄今无法从冲积河道获得的数据，并为更详细地耦合研究河流过程及其沉积提供了重要机会。
Collecting high‐resolution data to quantify the sedimentary architecture within contemporary alluvial channels remains one of the outstanding challenges in fluvial sedimentology. Here, we present data collected using a new geophysical method, the parametric echo sounder (PES), which can meet this challenge. From surveys over a field of sand dunes in the Río Paraná, Argentina, we demonstrate the unique ability of PES to image the subsurface structure within active channels at a decimetric resolution. These data reveal the bounding surfaces between bars and dunes, as well as the foresets and reactivation surfaces within them. This provides quantitative in situ data for recent work that suggests cross‐strata preserved by dunes may be more related to flow depths less than the commonly assumed bankfull level. These surveys demonstrate that PES can provide hitherto unobtainable data from alluvial channels and presents significant opportunities for more detailed coupled studies of fluvial processes and their deposits.