Benthic biology influences sedimentation in submarine channel bends: Coupling of biology, sedimentation and flow

Benthic biology influences sedimentation in submarine channel bends: Coupling of biology, sedimentation and flow
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底栖生物影响海底河道弯曲处的沉积:生物、沉积和流动的耦合

DOI:
10.1002/dep2.265
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发表时间:
2024
期刊:
The Depositional Record
影响因子:
--
通讯作者:
Azpiroz-Zabala M
Azpiroz-Zabala M
中科院分区:
--
文献类型:
--
作者:
Azpiroz-Zabala M

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海底通道是将水流和营养物输送到深水的关键特征。以前的研究,他们的形态和渠道的演变处理这些系统作为非生物,因此,假设物理过程是唯一负责形态发展。在这里,一个独特的数据集,包括空间测量周围的信道弯曲主机活跃的沉积物重力流。数据包括流速和密度,以及河床粒度和河床底栖大型动物。这些参数的分析表明,虽然物理过程控制最广泛的规模变化的沉积周围和整个通道,底栖生物起着关键作用,在稳定沉积物和捕获的罚款。这导致混合粒度比纯非生物沉积所预期的要大得多,并使沉积床保持在所有沉积物都应积极迁移的位置。鉴于以前的工作也表明,海底通道可以是生物热点,那么本研究表明,底栖生物可能在通道形态和演变中起着关键作用,这些都需要在现代和考虑保存在岩石记录中的例子时加以考虑。
Submarine channels are key features for the transport of flow and nutrients into deep water. Previous studies of their morphology and channel evolution have treated these systems as abiotic, and therefore assume that physical processes are solely responsible for morphological development. Here, a unique dataset is utilised that includes spatial measurements around a channel bend that hosts active sediment gravity flows. The data include flow velocity and density, alongside bed grain size and channel‐floor benthic macrofauna. Analysis of these parameters demonstrate that while physical processes control the broadest scale variations in sedimentation around and across the channel, benthic biology plays a critical role in stabilising sediment and trapping fines. This leads to much broader mixed grain sizes than would be expected from purely abiotic sedimentation, and the maintenance of sediment beds in positions where all the sediment should be actively migrating. Given that previous work has also shown that submarine channels can be biological hotspots, then the present study suggests that benthic biology probably plays a key role in channel morphology and evolution, and that these need to be considered both in the modern and when considering examples preserved in the rock record.
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