Marine Geology最新文献_第7页

Mechanisms and seasonal variability of sediment transport in a small tropical mountainous estuary-coastal system: Insights from the Selangor River, Malaysia 一个小型热带山区河口-海岸系统中沉积物运输的机制和季节变化：来自马来西亚雪兰莪河的见解

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-07-17 DOI: 10.1016/j.margeo.2025.107619

Haoshen Liang , Aijun Wang , Chui Wei Bong , Shuqin Tao , Boyu Liu , Kar Hoe Loh , Xiang Ye , Yi You Wong , Haiqi Li , Choon Weng Lee

Small- and medium-sized mountainous rivers (SMRs) are critical pathways for delivering terrestrial sediment to coastal systems, particularly in the tropical regions where their dynamics are highly sensitive to anthropogenic influences. This study investigates the sediment transport processes and ultimate deposition patterns in the Selangor River estuary, Malaysia - a representative tropical macrotidal estuary characterized by complex nearshore topography and weak Coriolis effects. By combining field measurements (2023–2024) with sediment analysis, this research reveals three key findings. First, approximately 73.5 % of the annual sediment discharge (19.75 × 10⁴ t) accumulates in estuarine tidal flats, with the northern tidal flats receiving twice the deposition of the southern tidal flats. Second, distinct seasonal transport regimes were evident: (i) during the dry season wave-driven sediment resuspension and tidal forces result in northwestward-southeastward transport, (ii) during the wet season stratified flows lead to significant sediment-freshwater decoupling, where river plumes disperse offshore while terrestrial sediments remain trapped near the estuary. Third, the unique sediment trapping mechanism, different from both large river systems and wave-dominated tropical SMRs, resulting from the interaction of strong tidal currents, seasonal river discharge, and offshore water intrusion form the Strait of Malacca. These findings provide a new conceptual framework for understanding sediment retention in tropical macrotidal estuaries, with implications for coastal management under climate change and intensifying anthropogenic pressures.

中小型山地河流是向沿海系统输送陆地沉积物的重要途径，特别是在其动态对人为影响高度敏感的热带地区。本文研究了马来西亚雪兰莪河河口的泥沙输运过程和最终沉积模式。雪兰莪河河口是一个具有代表性的热带大潮河口，近岸地形复杂，科里奥利效应弱。通过将现场测量（2023-2024年）与沉积物分析相结合，本研究揭示了三个关键发现。首先，年输沙量的73.5% （19.75 × 104 t）聚集在河口潮滩，其中北部潮滩的输沙量是南部潮滩的两倍。其次，明显的季节输送机制：(1)在旱季，波浪驱动的沉积物再悬浮和潮汐力导致西北-东南输送；(2)在雨季，分层流动导致沉积物-淡水明显脱钩，河流羽流分散到近海，而陆地沉积物仍被困在河口附近。第三，马六甲海峡强潮流、季节性河流流量和近海水入侵共同作用，形成了独特的泥沙捕获机制，不同于大型河流水系和以波浪为主导的热带小流域。这些发现为理解热带大潮河口沉积物滞留提供了一个新的概念框架，对气候变化和人为压力加剧下的海岸管理具有重要意义。

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引用次数: 0

Reconstructing Holocene seismic and tsunami history along the Rio Grande coast, Oaxaca, Mexico 重建墨西哥瓦哈卡州里约热内卢Grande海岸全新世地震和海啸历史

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-07-11 DOI: 10.1016/j.margeo.2025.107617

Oswaldo Coca , María Teresa Ramírez-Herrera , Krzysztof Gaidzik , Steven L. Forman , Víctor Vargas-Espinosa , Luis Ramón Velázquez-Maldonado , Néstor Corona , Ana Carolina Ruiz-Fernández

This study aims to identify past earthquakes and tsunamis in the Oaxaca region of Mexico, a segment of the subduction zone between the Cocos and North American plates. We reconstructed paleoelevations from the sedimentary record using diatom-based transfer functions to identify co-seismic, post-seismic, inter-seismic, and permanent deformation associated with land-level changes. To achieve this, we developed a paleoelevation model using modern diatoms. Up to four allochthonous sand layers were identified as tsunami deposits and their triggering earthquakes, associated coseismic uplift and subsidence. Unit 1 (1769 ± 74 CE) records co-seismic uplift of 0.065 ± 1.04 m and is associated with the 1787 M8.6 earthquake and tsunami. Unite 2 (1085 ± 40 CE) records a co-seismic uplift of 0.082 ± 0.93 m. Unite 3 (830 ± 45 CE) shows a co-seismic subsidence of −0.091 ± 1.08 m. Unite 4, dated between 811 and 751 cal BC and 766–465 cal BC, records a co-seismic uplift of 0.513 ± 0.37 m, likely caused by a > M7.5 tsunamigenic earthquake. The reconstructed magnitudes, inferred from land-level changes, reveal a variable seismic history. Finally, we identified a cumulative permanent uplift deformation of 0.76 m over the last 2800 years.

这项研究旨在确定墨西哥瓦哈卡地区过去的地震和海啸，这是科科斯和北美板块之间的俯冲带的一部分。我们利用基于硅藻的传递函数从沉积记录中重建了古海拔，以识别与陆面变化相关的同震、震后、震间和永久变形。为了实现这一目标，我们利用现代硅藻开发了一个古海拔模型。确定了4个异域砂层为海啸沉积及其引发的地震和同震隆升沉降。单元1（1769±74 CE）记录了0.065±1.04 m的同震隆起，与1787年8.6级地震和海啸有关。第2单元（1085±40 CE）记录的同震隆升为0.082±0.93 m。单元3（830±45 CE）同震沉降为−0.091±1.08 m。第4单元的年代介于公元前811年至751年和公元前766年至465年之间，记录了同震隆起0.513±0.37米，可能是由>；7.5级海啸性地震。从地表变化推断出的重建震级揭示了一个变化的地震历史。最后，我们确定了在过去2800年中累积的永久隆起变形为0.76 m。

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引用次数: 0

Study on the response and recovery of beach sediments under the impact of Typhoon “Chaba” (no. 2203) and high-elevation aquaculture pond effluent discharge 台风“查巴”对海滩沉积物的影响及恢复研究。2203)和高海拔养殖池塘污水排放

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-07-07 DOI: 10.1016/j.margeo.2025.107616

Mingming Yuan , Liping Huang , Yuehua Qi , Dezhi Chen , Longbo Deng , Lintao Zhao , Gaocong LI

Under the combined influences of climate change and human activities, coastal sediments dynamic and recovery mechanisms following extreme storm events have become central issues in coastal research and management. This study investigates beach sediment dynamics and recovery processes under the joint effects of Typhoon No. 2203 “Chaba” and high-elevation aquaculture pond (HEAP) effluent discharge. The key findings are as follows: Typhoon forcing conditions: During the event, wind direction shifted from ES to N and wind speed rose from 6.46 m/s to 14.43 m/s, superimposed on a 4.18 m storm surge. The mean wave period and significant wave height rose to 7.34 s and 1.38 m, respectively, while the shear-stress due to waves surged from 0.20 to 4.20 N/m²—far exceeding the threshold shear-stress of 0.60 N/m². On the normal beach, typhoon events led to finer sediment deposition on the upper beach and coarser sediment on the lower beach. These changes rapidly returned to the pre-typhoon state within one week. On the impacted beach, typhoon events and aquaculture effluent significantly altered sediment distribution. Combined effects of effluent-driven morphology and hydrodynamics caused complex patterns and limited recovery. Effluent discharge, tidal action, and wave dynamics collectively establish a high-energy conduit system that extends the landward reach of tidal inundation and intensifies erosion at the beach berm and coastal dune front. This synergistic forcing underlies the rapid evolution of scour-trench and grain-size distributions during extreme events. Therefore, it is recommended to implement coordinated strategies in terms of drainage outlet placement, ecological protection measures, and management practices. These measures aim to promote harmony between aquaculture and the beach environment, ensuring sustainable ecological and economic development.

在气候变化和人类活动的共同影响下，极端风暴事件后海岸沉积物的动力和恢复机制已成为海岸研究和管理的核心问题。本文研究了2203号台风“察巴”和高海拔养殖池（HEAP）污水排放共同作用下的海滩沉积物动态和恢复过程。主要发现如下：台风强迫条件：事件期间，风向由东南向北转变，风速由6.46 m/s上升至14.43 m/s，叠加了4.18 m风暴潮；平均波周期和有效波高分别上升到7.34 s和1.38 m，波浪引起的剪切应力从0.20 N/m2上升到4.20 N/m2，远远超过阈值0.60 N/m2。在正常海滩上，台风事件导致上海滩沉积物沉积较细，下海滩沉积物较粗。这些变化在一周内迅速恢复到台风前的状态。在受影响的海滩上，台风事件和水产养殖废水显著改变了沉积物的分布。污水驱动的形态和流体动力学的共同作用导致了复杂的模式和有限的采收率。污水排放、潮汐作用和波浪动力学共同建立了一个高能管道系统，扩大了潮汐淹没向陆地的范围，加剧了海滩护堤和海岸沙丘前缘的侵蚀。这种协同强迫是极端事件期间冲沟和粒度分布快速演变的基础。因此，建议在排水口布置、生态保护措施和管理实践等方面实施协调策略。这些措施旨在促进水产养殖与海滩环境的和谐，确保生态和经济的可持续发展。

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引用次数: 0

Floc size asymmetry modulated by tidal dynamics drives net landward sediment transport in a man-made tidal channel 潮汐动力调节的浮群大小不对称驱动人工潮汐通道中净向陆地输沙

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-07-03 DOI: 10.1016/j.margeo.2025.107615

Wenjian Li , Guan-hong Lee , Jongwi Chang , Ojudoo Darius Ajama , Zhenyan Wang

In natural aquatic systems, flocculation affects sediment transport by altering particle size and settling velocity. However, the asymmetry in floc size over tidal cycles and its influence on sediment transport, especially in turbid coastal regions affected by human activities, remains understudied. This study uses comprehensive observations from ADV, HR-ADCP, Signature ADCP, LISST, and CTD within a man-made tidal channel located on the west coast of the Korean Peninsula to elucidate the size-dependent sediment transport process. Our findings reveal a tidal asymmetry in bottom shear velocity and particle size distribution (PSD). During ebb tide, the bottom shear velocity was higher, but suspended sediment concentration (SSC), Total Volume Concentration (TVC), and mean size (

M_{z}

) were lower compared to flood tide. This suggests that advection transport, in addition to resuspension, is a significant source of particles during flood tide. These particles increased SSC, TVC, and landward sediment flux, while low shear velocity facilitated flocculation, resulting in higher

M_{z}

. Consequently, a higher proportion of microflocs and macroflocs occurred, leading to a higher settling flux from flood tide to high slack water. In contrast, weaker advection transport and low SSC during ebb tide led to lower seaward sediment flux, with stronger shear velocity and lower concentration resulting in weak flocculation and lower

M_{z}

. During ebb tide, flocculi (10–20 μm diameter) exceeded microflocs and macroflocs, causing a lesser settling flux. This tidal asymmetry in floc size explains the trapping of larger particles during flood tide and high water levels, ultimately leading to net landward sediment flux in the channel over tidal cycles.

在自然水体系统中，絮凝作用通过改变颗粒大小和沉降速度来影响沉积物的运移。然而，潮汐周期中絮体大小的不对称性及其对沉积物输运的影响，特别是在受人类活动影响的浑浊沿海地区，仍未得到充分研究。本研究利用位于朝鲜半岛西海岸的人工潮汐通道内的ADV、HR-ADCP、Signature ADCP、LISST和CTD的综合观测资料，阐明了泥沙的大小依赖输运过程。我们的发现揭示了海底剪切速度和粒径分布（PSD）的潮汐不对称性。退潮时，底面剪切速度增大，悬沙浓度（SSC）、总积浓度（TVC）和平均粒径（Mz）均小于涨潮时；这表明，除再悬浮外，平流输送是涨潮期间颗粒物的重要来源。这些颗粒增加了SSC、TVC和向陆沙通量，而低剪切速度有利于絮凝，导致Mz升高。因此，微絮凝体和大絮凝体的比例更高，导致涨潮到高松弛水的沉降通量更高。低潮时平流输运减弱，SSC降低，向海输沙通量降低，剪切速度增强，浓度降低，絮凝作用弱，Mz降低。退潮时，絮凝体（直径10 ~ 20 μm）超过微絮凝体和大絮凝体，沉降通量较小。这种浮冰大小的潮汐不对称解释了在涨潮和高水位期间较大颗粒的捕获，最终导致潮汐循环期间河道中向陆地的净沉积物通量。

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引用次数: 0

The Bering Sea shelf as a sink for terrigenous organic carbon: Insights from sediment geochemistry 作为陆源有机碳汇的白令海陆架：来自沉积物地球化学的见解

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-07-02 DOI: 10.1016/j.margeo.2025.107614

Song Zhang , Zhongqiao Li , Bassem Jalali , Youcheng Bai , Zhongqiang Ji , Hongliang Li , Haiyan Jin , Jianfang Chen

Recent Arctic warming has accelerated permafrost thaw, mobilizing ancient organic carbon (OC) into the ocean. The Bering Sea, connected to major rivers such as the Yukon and Anadyr, receives substantial terrigenous carbon inputs. However, the sources and fate of the terrigenous OC remain poorly characterized. In this study, we aimed to assess the sources and sinks of organic matter on the Bering Sea Shelf by analyzing multi parameters such as TOC, TN, δ¹³C, lignin phenols, grain size and SSA of the surface sediments. OC and TN exhibit similar spatial patterns, with higher concentrations in the western region but lower along the Alaska Coastal Current (ACC). δ¹³C values decreased from east to west, ranging from −24.36 ‰ to −22.03 ‰, suggesting a westward decline in terrigenous OC influence, corroborated by C/N ratios. Lignin content (Λ8) varies from 0.49 to 4.58 mg/100 mg OC, peaking near the Yukon River estuary. Ratios of syringyl to vanillyl (S/V) and cinnamyl to vanillyl (C/V) phenols indicate mixed inputs from angiosperms and gymnosperms. Our findings demonstrate that the distribution of terrigenous OC is primarily governed by hydrodynamic sorting and mineral surface adsorption. We conclude that the Bering Sea shelf functions as a net sink for terrigenous organic carbon, a phenomenon expected to intensify with anticipated Arctic warming.

最近的北极变暖加速了永久冻土的融化，将古代有机碳（OC）转移到海洋中。与育空河和阿纳德尔河等主要河流相连的白令海接收了大量的陆地碳输入。然而，陆源OC的来源和命运仍然不清楚。本文通过分析白令海陆架表层沉积物TOC、TN、δ13C、木质素酚类、粒径、SSA等参数，探讨了白令海陆架表层有机质的来源和汇。OC和TN表现出相似的空间格局，西部地区浓度较高，而沿阿拉斯加海岸流（ACC）浓度较低。δ13C值自东向西递减，在- 24.36‰~ - 22.03‰之间，表明陆源OC的影响向西减弱，C/N比值也证实了这一点。木质素含量（Λ8）在0.49 ~ 4.58 mg/100 mg OC之间变化，在育空河河口附近达到峰值。丁香基与香草基酚（S/V）和肉桂基与香草基酚（C/V）的比值表明被子植物和裸子植物的混合输入。研究结果表明，陆源OC的分布主要受水动力分选和矿物表面吸附的控制。我们的结论是，白令海陆架作为陆源有机碳的净汇，这一现象预计将随着预期的北极变暖而加剧。

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引用次数: 0

Two millennia of intense tropical cyclone activity in the western North Pacific: Insights from coastal boulder deposits 北太平洋西部两千年的强烈热带气旋活动：来自海岸巨石沉积物的见解

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-07-01 DOI: 10.1016/j.margeo.2025.107612

Kenta Minamidate , Takashi Ishizawa , Hironobu Kan , Yusuke Yokoyama , Naoto Koiwa , Akifumi Ito , Kazuhisa Goto

Tropical cyclones (TCs) are among the most destructive hydrodynamic disturbances, yet our knowledge of their long-term climatology is limited by the short length of observational records. Geological records provide valuable insights into TC activity before modern observation. Although the western North Pacific (WNP) is the most active TC basin, little is known about how intense TCs have responded to long-term climate variability. Here, this study presents a new two-millennia record of intense TC activity from coastal boulder deposits on Amami-Oshima Island in the Ryukyu Islands, Japan. The results indicate reduced TC activity during colder periods, including the Late Antique Little Ice Age (LALIA; 540–660 CE) and the Little Ice Age (LIA; 1400–1700 CE), and increased activity from the end of cold periods to warm periods, including the Medieval Climate Anomaly (MCA; 950–1250 CE) and the Current Warm Period (CWP; 1850 CE–present). Our integration of paleo-TC and paleoclimate records shows that TC activity had been synchronously activated during warm periods at middle latitudes in the WNP; however, it had been enhanced during the LIA at low latitudes. These meridional anti-phase patterns are likely driven by the variability in air and sea surface temperature and associated shifts in the Hadley circulation. Given the unprecedented rise in global mean temperature, ongoing climate change may drive significant changes in TC behavior, potentially mirroring or exceeding past warm-period trends.

热带气旋（TCs）是最具破坏性的水动力扰动之一，但我们对其长期气候学的认识受到观测记录长度短的限制。地质记录为现代观测之前的TC活动提供了有价值的见解。尽管西北太平洋（WNP）是最活跃的TC盆地，但人们对TC强度如何响应长期气候变率知之甚少。在这里，这项研究展示了日本琉球群岛奄美-大岛海岸巨石沉积物两千年来强烈的TC活动的新记录。结果表明，在较冷的时期，包括晚古生代小冰期（LALIA）；公元540-660年)和小冰期(LIA；公元1400-1700年)，从寒冷期结束到温暖期活动增加，包括中世纪气候异常(MCA；950-1250 CE)和当前暖期（CWP）；1850 CE-present)。综合古TC和古气候记录表明，中纬度暖期TC活动同步激活；低纬度低气压在低纬度低气压期间有所增强。这些经向反相位模式可能是由空气和海洋表面温度的变化以及哈德利环流的相关变化所驱动的。鉴于全球平均温度前所未有的上升，持续的气候变化可能会推动全球变暖行为发生重大变化，可能反映或超过过去的暖期趋势。

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引用次数: 0

Supra-subduction lithospheric metasomatism and water outflux beyond island-arc volcanism 超俯冲岩石圈交代作用和岛弧火山作用外的水流出

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-07-01 DOI: 10.1016/j.margeo.2025.107613

Mengming Yu , Chi-Yue Huang , Graciano P. Yumul Jr. , Jonny Wu , Guangfa Zhong , Minghui Zhao , Yi Yan

Understanding the global water balance between subduction influx and outflux requires exploring for unrecognized sources of water outflux beyond island-arc volcanism. Here we investigate the petrogenesis of the principal high-temperature hydrous mineral (i.e., amphiboles) in oceanic gabbros of the Huatung Basin, an Early Cretaceous oceanic relict sandwiched between the Gagua Ridge Arc and the Taiwan-Luzon Arc in the northwesternmost corner of the Philippine Sea Plate. The amphiboles show low TiO₂ (<1.5 wt%) and Nb/Yb (≤0.3) and ∼550–800 °C equilibration temperatures using amphibole-plagioclase thermometry, indicating high-temperature metamorphic origins. The low whole-rock ⁸⁷Sr/⁸⁶Sr (703216–0.703294) indicates the fluids involved in the formation of these amphiboles were hydrous island-arc melts. Viewed in conjunction with the large variations of the existed radioisotopic ages (∼130, ∼123–116, ∼105, and ∼70 Ma), the reported seismic velocity structure of the Huatung Basin that implies younger ocean lithosphere ages (20–50 Ma) is likely related to pervasive supra-subduction lithospheric metasomatism of the oceanic lithosphere. This metasomatism was probably hosted by intrusions of Gagua Ridge and Taiwan-Luzon island-arc magmatism. We suggest that such metasomatism of supra-subduction lithosphere by hydrous island-arc melts could be important for water outflux beyond island-arc volcanism globally.

要了解俯冲内流和流出之间的全球水平衡，就需要探索岛弧火山作用之外尚未被认识的水流出来源。本文研究了菲律宾海板块西北角，夹在加瓜脊弧和台湾-吕宋弧之间的早白垩世海洋遗迹华东盆地洋辉长岩中主要高温含水矿物（角闪石）的岩石成因。角闪石-斜长石测温显示，该角闪石的TiO2 （<1.5 wt%）和Nb/Yb（≤0.3）较低，平衡温度为~ 550-800℃，表明其高温变质成因。全岩87Sr/86Sr（703216-0.703294）值较低，表明角闪孔形成流体为含水岛弧熔体。结合现有放射性同位素年龄（~ 130、~ 123-116、~ 105和~ 70 Ma）的大变化，华东盆地的地震速度结构表明海洋岩石圈年龄更年轻（20-50 Ma），这可能与海洋岩石圈普遍存在的超俯冲岩石圈交代作用有关。该交代作用可能受加瓜岭侵入和台湾-吕宋岛弧岩浆作用的支配。我们认为，这种由含水岛弧熔体形成的超俯冲岩石圈交代作用可能对全球岛弧火山作用之外的水流出具有重要意义。

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引用次数: 0

14C dating of tsunami deposits in arid environments: How challenging can it be? The example of La Graciosa, Canary Islands 干旱环境中海啸沉积物的14C测年：有多大的挑战性？以加那利群岛的格拉西奥萨为例

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-06-24 DOI: 10.1016/j.margeo.2025.107607

Raphaël Paris , Franck Lavigne , Christine Hatté , Juan Francisco Betancort , Jean-Pierre Flandrois , Arnauld Vinçon-Laugier , Eve Poulallion , Simon Falvard , Bachtiar W. Mutaqin , Christophe Lécuyer

¹⁴C dating of tsunami deposits in arid environments is often challenging, especially when there is no organic material available. The marine bioclasts found in the tsunami deposits thus become the main dating possibility. Apart from the reservoir effect, the main source of uncertainty is the age difference between the shells and the tsunami that transported them. Taking as an example a tsunami deposit on the island of La Graciosa (Canary Islands), we demonstrate that the marine shells (Patella) come from different sources, with ¹⁴C ages ranging from >45 kBP to 200 BP, the main source being an ancient marine terrace probably of MIS5e age. In addition, we propose a landslide source for this tsunami, the scar of which can be observed on the Famara cliff to the northeast of Lanzarote, just opposite the tsunami deposit outcrops at La Graciosa. In addition to the methodological aspects of shell dating, this study also serves as a reminder that local tsunamis generated by coastal cliff collapses are not a hazard to be neglected.

干旱环境中海啸沉积物的14C测年通常具有挑战性，特别是在没有有机物质可用的情况下。在海啸沉积物中发现的海洋生物碎屑因此成为主要的测年可能性。除了水库效应，不确定性的主要来源是贝壳和运送它们的海啸之间的年龄差异。以加那利群岛La Graciosa岛的海啸沉积为例，分析了海贝壳（Patella）的不同来源，其14C年龄在45 ~ 200 BP之间，主要来源可能是MIS5e时代的古海相阶地。此外，我们提出了这次海啸的滑坡来源，在兰萨罗特岛东北部的Famara悬崖上可以观察到它的疤痕，就在La Graciosa海啸沉积物露头的对面。除了贝壳年代测定的方法方面，这项研究还提醒人们，由沿海悬崖崩塌引起的局部海啸不是一个不容忽视的危险。

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引用次数: 0

The geomorphometry of Antarctic submarine canyons 南极海底峡谷的地貌学

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-06-24 DOI: 10.1016/j.margeo.2025.107608

Riccardo Arosio , David Amblas

Submarine canyons are deep, large-scale incisions found on most of the world's continental margins. In Antarctica, canyons are widespread features driving mesoscale oceanographic processes with significant implications for global climate and circulation, connecting shallow to deep sedimentary processes and positively influencing biodiversity and ecosystem functioning. The understanding of their oceanographic, climatic, geological and ecological significance is limited by the detail, accuracy and extent of canyon inventory. This study aims to create the best possible catalogue of Antarctic submarine canyons and gullies taking advantage of the new International Bathymetric Chart of the Southern Ocean (IBSCO) v.2. Semi-automatic hydrological techniques were adopted to delineate the drainage network, and to extract attributes such as the stream order, stream gradient and sinuosity. We identified 332 drainage networks with 3291 stream segments, nearly 5 times the number of canyons identified in previous studies, and calculated 15 morphometric parameters for each segment. We observe significant differences across Antarctic margins. East Antarctica shows the most complex and largest drainage networks, while the Antarctic Peninsula has the greatest number of networks, although with the lowest stream orders and shortest lengths. Western Antarctica has less complexity and shorter network lengths compared to East Antarctica. These differences may reflect the contrasting glacial histories of the two regions, with the earlier onset of the East Antarctic Ice Sheet leading to older and more developed canyon systems.

海底峡谷是在世界上大多数大陆边缘发现的深而大规模的切口。在南极洲，峡谷是驱动中尺度海洋学过程的普遍特征，对全球气候和环流具有重大影响，连接浅层和深层沉积过程，并对生物多样性和生态系统功能产生积极影响。对它们的海洋学、气候、地质和生态意义的认识受到峡谷清查的细节、准确性和范围的限制。这项研究的目的是利用新的国际南大洋测深图（IBSCO） v.2，创建南极海底峡谷和沟壑的最佳目录。采用半自动水文技术对流域水网进行圈定，提取流域序、坡度、弯度等属性。我们确定了332个流域网络，3291个河段，几乎是以前研究中确定的峡谷数量的5倍，并计算了每个河段的15个形态计量参数。我们观察到南极边缘的显著差异。东南极洲显示出最复杂和最大的水系网络，而南极半岛的水系网络数量最多，尽管其流阶最低，长度最短。与东南极洲相比，西南极洲的复杂性更低，网络长度更短。这些差异可能反映了两个地区不同的冰川历史，南极东部冰盖的早期形成导致了更古老和更发达的峡谷系统。

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引用次数: 0

Sedimentary records of mid-Holocene extreme storm events and Neolithic cultural response in the Yaojiang-Ningbo Plain, East China 姚江-宁波平原中全新世极端风暴事件的沉积记录与新石器文化响应

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology

Pub Date : 2025-06-22 DOI: 10.1016/j.margeo.2025.107611

Fangyou Lin , Shuwen Mei , Hao Xu , Maojie Yang , Michael E. Meadows , Zhanghua Wang (王张华)

The Yaojiang-Ningbo coastal plain in East China is naturally vulnerable to salinity intrusion. At around 5.3 ka, the study area experienced a period (the 5.3 ka extreme storm period) when extreme storm events and associated salinity intrusions were especially frequent. Sedimentary records are widely distributed in the plain but have thus far not been systematically amalgamated, constraining interpretation of the impacts of these extreme storms on prehistoric coastal communities. Here we present a multi-proxy analysis of the chronology, sedimentology, and geochemistry of a profile containing records of the 5.3 ka extreme storm period from a newly excavated Neolithic site, Hukengji, in the Yaojiang-Ningbo plain. Results of the paleoenvironmental reconstruction evidences a tidal marsh environment at the site at ca. 6.0 ka, which was exposed to salinity intrusions at ca. 5.3 ka and river flooding at ca. 5.1 ka. Through comparison with other sedimentary records in the region, we show that the 5.3 ka extreme storm period in the Yaojiang-Ningbo Plain extended from ca. 5.4 ka to ca. 4.9 ka, with two peaks at around 5.3 ka and 5.1 ka. Communities of the Hemudu Culture Period IV adapted to this phase of coastal flooding, for example, by constructing artificial mounds. However, the effects of the extreme hydroclimatic events during the 5.3 ka extreme storm period led eventually to the Hemudu Culture being replaced across the region by the more complex and socially stratified Liangzhu Culture from around 5.1 ka onwards.

中国东部姚江-宁波沿海平原是天然易受盐度入侵的地区。5.3 ka前后，研究区经历了一个极端风暴事件和相关盐度入侵特别频繁的时期（5.3 ka极端风暴期）。沉积记录在平原上广泛分布，但到目前为止还没有系统地合并，这限制了对这些极端风暴对史前沿海群落影响的解释。本文采用多指标分析方法，对位于瑶江-宁波平原新出土的新石器时代遗址虎坑集的5.3 ka极端风暴期剖面进行了年代学、沉积学和地球化学分析。古环境重建结果表明，该遗址约6.0 ka时为潮汐沼泽环境，约5.3 ka时为盐度入侵，5.1 ka时为河流洪水。通过与该地区其他沉积记录的对比，我们发现，耀江-宁波平原5.3 ka极端风暴期从约5.4 ka延伸至约4.9 ka，在5.3 ka和5.1 ka前后出现了两个高峰。河姆渡文化第四期的社区通过建造人工土墩来适应这一阶段的沿海洪水。然而，5.3 ka极端风暴时期的极端水文气候事件的影响最终导致河姆渡文化在整个地区被5.1 ka左右更复杂和社会分层的良渚文化所取代。

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