Continental Shelf Research最新文献_第9页

The role of sediment transport processes in shaping offshore sand waves 泥沙输运过程在近海沙浪形成中的作用

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-07-13 DOI: 10.1016/j.csr.2025.105513

Pauline H.P. Overes , Bas W. Borsje , Arjen P. Luijendijk , Johan Reyns , Suzanne J.M.H. Hulscher

Sand waves, large scale dynamic bedforms, which are found on sandy, shallow seabeds worldwide, present an immediate risk to offshore structures, raising a pressing need for predicting related bed level dynamics on decadal timescales. Numerical models can help us understand and predict sand wave dynamics, but have shown difficulties with preserving sand wave shapes. Using the process-based Delft3D Flexible Mesh model, we have found that the choice of sediment transport formulation has a significant effect on the stability of sand wave shapes. The widely used Van Rijn (1993) sediment transport formulation predicts relatively high bed load transport rates, thereby raising a need for more dominant slope-induced transport. The simulations revealed that the Van Rijn (2007) formulation, which predicts relatively lower transport rates, and thus allows for lower bed slope-induced transports, is better capable of preserving the steep slopes of sand waves, while limiting sand wave growth. By considering various shape characteristics in our model assessment, more insight is gained about the improvements as well as adverse effects of changes in the parameterization of physical processes. These characteristics show that only with the less dominant bed slope-induced transport the crest levels are stable, while trough levels still lower slowly over time. This indicates that local processes are responsible for limiting the growth of sand waves and the importance of slope-induced transport has been overstated in previous works. With the adapted, non-upscaled set-up, the evolution of sand waves over multiyear timescales is represented well in the model compared to bathymetric field data for two contrasting sand wave field sites.

沙波是一种分布在世界各地沙质浅海床上的大尺度动态床型，对近海结构构成直接威胁，因此迫切需要在年代际尺度上预测相关的床位动力学。数值模型可以帮助我们理解和预测沙波动力学，但在保存沙波形状方面存在困难。利用基于过程的Delft3D柔性网格模型，我们发现泥沙输沙公式的选择对沙波形状的稳定性有显著影响。广泛使用的Van Rijn（1993）泥沙输运公式预测了相对较高的河床输运率，从而提出了对更主要的斜坡诱导输运的需求。模拟结果表明，Van Rijn（2007）公式预测了相对较低的输运率，从而允许较低的床坡引起的输运，能够更好地保持沙波的陡坡，同时限制沙波的增长。通过在我们的模型评估中考虑各种形状特征，对物理过程参数化变化的改进和不利影响有了更多的了解。这些特征表明，只有在坡面输运不占优势的情况下，波峰水平是稳定的，而波谷水平随时间缓慢下降。这表明，局部过程对沙波的增长起着限制作用，而斜坡引起的输运的重要性在以前的工作中被夸大了。与两个对比沙波场的水深场数据相比，采用经过调整的、非升级的设置，该模型可以很好地代表多年时间尺度上的沙波演变。

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引用次数: 0

Seasonal variation and response of surf zone fish assemblages to environmental variables in the Northeast Pacific 东北太平洋冲浪带鱼类群落的季节变化及其对环境变量的响应

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-07-12 DOI: 10.1016/j.csr.2025.105526

Gammon N. Koval , Jenifer E. Dugan , Scott L. Hamilton

Located at the land-sea interface, the highly dynamic sandy beach and surf zone ecosystem is one of the coastal zones used most intensely by humans (e.g., recreation, fishing, tourism). Surf zones are also important as fish habitat; however, the factors structuring fish assemblages in the surf zone are relatively understudied due to challenges associated with sampling this dynamic environment. To investigate temporal influences on surf zone fish communities, we evaluated seasonal trends in the fish assemblage and associations with environmental conditions using baited remote underwater video stations (BRUVS) at four beaches on the Northeast Pacific coast (California, USA) from July 2020 to June 2021. Our study region is characterized by strong seasonality in productivity (due to spring upwelling) and the wave climate (in response to winter storms), making it an ideal location for evaluating seasonal change in surf zone fish. We found that surf zone fish assemblages exhibited marked seasonality and site-to-site variability. Two species of surfperch (Amphistichus argenteus and A. koelzi) and leopard sharks (Triakis semifasciata) were more common in the winter and spring, corresponding with surfperch spawning, while flatfishes were more abundant in the summer. Fish species composition was most affected by distance from shore (as a proxy for surf zone width), visibility, water temperature, percent cover of combined macroalgae and surfgrass, and breaker wave height, with significant effects detected for distance from shore and breaker height. Fish species that exhibited higher abundance in the winter, including A. argenteus, A. koelzi, and T. semifasciata, were associated with larger waves and wider surf zones. Our results highlight the influence of seasonal variation in environmental conditions on fish communities in the dynamic, coastal surf zone ecosystem, with potential management implications for several highly abundant species targeted by recreational fisheries.

高度动态的沙滩和冲浪带生态系统位于海陆界面，是人类最频繁使用的海岸带之一（如娱乐、捕鱼、旅游）。冲浪区也是鱼类的重要栖息地；然而，由于对这种动态环境进行采样的挑战，对冲浪区鱼类组合的结构因素的研究相对不足。为了研究对冲浪区鱼类群落的时间影响，我们从2020年7月至2021年6月在东北太平洋海岸（美国加利福尼亚州）的四个海滩使用带饵的远程水下视频站（BRUVS）评估了鱼类种群的季节性趋势及其与环境条件的关系。我们的研究区域在生产力（由于春季上升流）和波浪气候（响应冬季风暴）方面具有强烈的季节性特征，使其成为评估冲浪区鱼类季节性变化的理想地点。我们发现，冲浪区鱼类组合表现出明显的季节性和地点间的变异性。冬季和春季两种银鲈（Amphistichus argenteus和A. koelzi）和豹鲨（Triakis semifasciata）较为常见，与银鲈产卵相对应，而比目鱼在夏季较为丰富。鱼类种类组成受离岸距离（代表冲浪带宽度）、能见度、水温、大型藻类和水面草组合覆盖百分比和破浪高度的影响最大，其中离岸距离和破浪高度的影响显著。在冬季表现出较高丰度的鱼类，包括A. argenteus、A. koelzi和T. semifasciata，与更大的波浪和更宽的冲浪区有关。我们的研究结果强调了环境条件的季节性变化对动态沿海冲浪带生态系统中鱼类群落的影响，并对休闲渔业针对的几种高度丰富的物种具有潜在的管理意义。

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引用次数: 0

A numerical study of the morphodynamic response of reef islands under spectral waves 谱波作用下岛礁形态动力响应的数值研究

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-07-11 DOI: 10.1016/j.csr.2025.105524

Yu Yao , Yuting Song , Long Chen , Changshen Li

Most existing studies reports that many low-lying reef atoll islands are vulnerable to the sea level rise and increased storminess in the context of global climate change. The positive adjustment of these reef islands to such extreme oceanographic conditions still needs to be further verified. In this study, the open-source XBeach numerical model using its phase-resolving nonhydrostatic module (XB-NH) combined with its morphodynamic module is adopted to investigate the morphodynamic response of reef islands under spectral waves. The model is firstly validated by two published datasets with and without the presence of sandy island located on the reef flat. The model is then applied to examine the effects of a series of incident wave forcing conditions (significant wave height, peak wave period, reef flat water depth) and island initial morphological features (island height, island top width, island beach slope, island location) on the morphodynamic evolution of reef island. Model applications show that two main morphodynamic responses: the elevated reef island crest and the lagoonward migration of the whole island are identified with larger waves and increased water level. One or two of such morphodynamic self-adjustment can be also found for smaller island with steeper beach slope located more closer to the reef edge. These insights highlight the necessity to consider the island morphological features in the coastal management of low-lying reef atoll nations to better resolve their future stability and persistence.

大多数现有研究报告说，在全球气候变化的背景下，许多低洼的珊瑚礁环礁岛屿容易受到海平面上升和风暴增加的影响。这些岛礁是否对如此极端的海洋条件作出了积极的调整，还有待进一步验证。本研究采用开源的XBeach数值模型，利用其相分辨非静力模块（XB-NH）及其形态动力学模块，研究波谱下岛礁的形态动力学响应。首先用两组已发表的数据集对模型进行了验证，其中包含和不包含位于礁滩上的沙岛。然后应用该模型研究了一系列入射波强迫条件（有效波高、峰值波周期、礁面水深）和岛屿初始形态特征（岛屿高度、岛屿顶宽、岛屿滩坡、岛屿位置）对礁岛形态动力学演化的影响。模型应用表明，岛礁波峰升高和整个岛屿的泻湖迁移是两种主要的形态动力学响应，波浪变大，水位升高。在离礁缘较近、滩坡较陡的小岛上，也会出现一到两次形态动力学的自我调节。这些见解突出了在低洼珊瑚礁环礁国家的沿海管理中考虑岛屿形态特征以更好地解决其未来稳定性和持久性的必要性。

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引用次数: 0

Characterization of two channels of the Chiloé Inland sea used by aquaculture farming: An observational approach to water exchange chilo<s:1>内海水产养殖用两条渠道的特征：水交换的观测方法

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-07-09 DOI: 10.1016/j.csr.2025.105512

Zeneida Wong , Richard Muñoz , Marcus Sobarzo

This study characterizes the hydrodynamics of the Dalcahue and Yal channels, key aquaculture areas within the Chiloé Inland Sea (CIS). It demonstrates the significant influence of bathymetric constrictions on local circulation patterns, tidal modulation, and biogeochemical variability. Dalcahue exhibits distinct bidirectional residual flows, characterized by intensified central inflows (NW-NE) and reinforced outflows (SE-SW) along the Quinchao coast, driven by channel curvature and bathymetry, with velocities reaching up to 70 cm/s in constrictions. In contrast, Yal shows a weak surface residual layer and persistent northwestward mid-depth flow, indicative of vertical tidal energy variations. Semidiurnal tidal forcing (M2, S2) predominantly drives current variability, explaining 50–75 % of observed fluctuations. A significant presence of the M4 overtide (up to 33 % in C2) highlights non-linear tidal interactions, crucial for understanding tidal asymmetry and net material transport. Weak correlations between sea level and dissolved oxygen suggest that strong tidal currents and mixing in constrictions counteract stratification, ventilating deeper layers. These findings enhance our understanding of physical oceanography in the context of the CIS, providing vital insights for environmental management and aquaculture planning by highlighting the role of constriction-induced hydrodynamics in estuarine systems worldwide.

本研究描述了chilo内海（CIS）内主要水产养殖区Dalcahue和Yal河道的水动力学特征。它证明了水深收缩对局部环流模式、潮汐调制和生物地球化学变异的显著影响。达尔卡休表现出明显的双向残余流，其特征是在通道曲率和水深测量的驱动下，沿昆潮海岸中心流入（NW-NE）增强，流出（SE-SW）增强，收缩时速度可达70厘米/秒。而Yal则表现出微弱的表层残留层和持续的西北中深流，表明垂直潮能的变化。半日潮强迫（M2, S2）主要驱动洋流变率，解释了观测到的波动的50 - 75%。M4溢出的显著存在（在C2中高达33%）突出了非线性潮汐相互作用，这对于理解潮汐不对称性和净物质输送至关重要。海平面和溶解氧之间的弱相关性表明，强烈的潮汐流和收缩的混合抵消了分层，使更深的层通风。这些发现增强了我们在CIS背景下对物理海洋学的理解，通过强调收缩引起的水动力学在全球河口系统中的作用，为环境管理和水产养殖规划提供了重要的见解。

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引用次数: 0

Weakening trend of Bohai Sea cold water mass revealed by a ten-year regional ocean simulation with data assimilation 十年区域海洋模拟资料同化揭示的渤海冷水团减弱趋势

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-07-07 DOI: 10.1016/j.csr.2025.105511

Hongliang Yu , Zheen Zhang , Lan Li , Chunxin Yuan , Zhen Gao , Xueen Chen

The high-resolution Oceanic Regional Circulation and Tide Model (ORCTM) with a compatible Ensemble Adjustment Kalman Filter (EAKF) assimilation module is implemented to investigate the general evolution and long-term trend of the Bohai Sea cold water mass (BHSCWM). Through comparison with multiple observational data, it can be proved that the reliability of model results is significantly improved after the data assimilation. The assimilated results from 2011 to 2020 show that the BHSCWM occurs from May to August, and its formation is closely related to the seasonal thermocline at a depth of about 10 m. There is a vertically uniform high-temperature water column in the central bank, which divides the BHSCWM into the south part (SBHSCWM) and the north part (NBHSCWM). It is noteworthy that there is a remarkable warming trend in the BHSCWM core, the warming rate reaches 0.24 °C/yr and 0.15 °C/yr for the SBHSCWM and the NBHSCWM, respectively. Meanwhile, whether in terms of cold water mass affected area or volume, a significant decreasing trend for both the SBHSCWM and the NBHSCWM is revealed by our assimilated results, suggesting that the Bohai Sea may be dramatically impacted in the context of global warming.

利用高分辨率海洋区域环流与潮汐模式（ORCTM）和兼容的集合平差卡尔曼滤波（EAKF）同化模块，研究了渤海冷水团（BHSCWM）的一般演变和长期趋势。通过与多个观测资料的对比，可以证明同化后的模型结果的可靠性得到了显著提高。2011 - 2020年同化结果表明，BHSCWM发生在5 - 8月，其形成与10 m左右深度的季节性温跃层密切相关。中央银行内存在垂直均匀的高温水柱，将BHSCWM分为南段（shbhscwm）和北段（NBHSCWM）。值得注意的是，BHSCWM核心增温趋势明显，shbhscwm和NBHSCWM核心增温速率分别达到0.24°C/yr和0.15°C/yr。与此同时，同化结果显示，无论是从影响面积还是从影响体积来看，渤海冷水质量都有显著减少的趋势，表明全球变暖对渤海冷水质量的影响可能很大。

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引用次数: 0

The vital role of current-topography interaction and tidal mixing in the upwelling around Zhoushan Archipelago 舟山群岛附近上升流中水流-地形相互作用和潮汐混合的重要作用

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-07-04 DOI: 10.1016/j.csr.2025.105514

Jianshe Mu, Juncheng Xie, Peng Bai, Bo Li, Jingling Yang, Ying Gao

Coastal upwelling plays a critical role in the marine biogeochemical environment by bringing nutrient-rich deep water to the surface, thereby fostering the development of high-biomass fishing grounds, such as the Zhoushan upwelling system in China. High-resolution Level-2 satellite-derived Sea Surface Temperature (SST) data captured notable upwelling events in the Zhoushan Archipelago, even under persistent northerly upwelling-unfavorable winds lasting over one week. Further analysis revealed that these upwelling-unfavorable winds not only generated onshore Ekman transport but also induced a negative wind stress curl, both of which acted to suppress upwelling. However, the weighted cumulative topographic position index demonstrated a quasi-steady upwelling intensity despite the unfavorable wind forcing. Under upwelling-favorable winds, a northward coastal current dominates the Zhoushan Archipelago offshore region, whereas a southward coastal current prevails under upwelling-unfavorable winds. The Zhoushan Archipelago features two prominent meridional topographic slopes formed by its two island chains. When northward or southward coastal current interacts with these slopes, upslope motion occurs on the stream-facing side, facilitating the upwelling of deeper cold water. Additionally, strong tidal current within the shallow waters surrounding the islands generates intense tidal mixing, further enhancing the upward transport of colder water to the surface. The locally enhanced current-topography interaction, tidal mixing, and leeward upwelling nearby the islands collectively trigger multiple cold upwelling cores around the islands, leading to a heterogeneous spatial distribution of upwelling around Zhoushan Archipelago.

沿海上升流在海洋生物地球化学环境中起着至关重要的作用，它将富含营养的深水带到海面，从而促进了高生物量渔场的发展，如中国舟山上升流系统。高分辨率的二级卫星海温（SST）数据捕获了舟山群岛显著的上升流事件，即使在持续超过一周的北风不利条件下也是如此。进一步的分析表明，这些不利于上升流的风不仅产生了陆上Ekman运输，还引起了负的风应力旋度，这两者都起到了抑制上升流的作用。然而，加权累计地形位置指数在不利风的作用下仍表现出准稳定的上升流强度。在有利上升风作用下，舟山群岛近海以北海岸流为主，而在不利上升风作用下，以南海岸流为主。舟山群岛的特点是由两个岛链形成的两个突出的经向地形斜坡。当向北或向南的海岸流与这些斜坡相互作用时，在面向河流的一侧发生上坡运动，促进更深的冷水上涌。此外，在岛屿周围的浅水中，强烈的潮流流产生强烈的潮汐混合，进一步加强了较冷的水向上输送到表面。岛屿附近局部增强的水流-地形相互作用、潮汐混合和背风上升流共同触发了岛屿周围多个冷上升流核，导致舟山群岛周围上升流的空间分布呈非均匀性。

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引用次数: 0

Horizontal and vertical distribution of fish larvae in the main entrance of Bahía de La Paz, Gulf of California (October 2022) 加州湾Bahía de La Paz主入口鱼类幼虫的水平和垂直分布（2022年10月）

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-06-22 DOI: 10.1016/j.csr.2025.105510

Rosabel Camacho-Gastélum , Laura Sánchez-Velasco , Sylvia P.A. Jiménez-Rosenberg , Victor M. Godínez , Francisco J. García-Rodríguez , Elvia D. Sánchez-Pérez , José F. Domínguez-Contreras

Bahía de La Paz, characterized by high biological diversity, presents an intense interchange with the Gulf of California, where Alfonso Basin is located. Horizontal and vertical distribution of fish larvae in the Alfonso Basin was analyzed in relationship with the water column structure during October 2022. Two water masses were registered, the Gulf of California Water mass, from 140 m depth to surface, and Subtropical Subsurface Water mass, below the first water mass. Fish larvae were collected from three depth layers: the surface mixed layer, the oxycline and the hypoxic layer, which is characterized by low dissolved oxygen concentration (<44 μmol kg⁻¹). The highest average density of fish larvae (27.9 larvae per 100 m³) was in the surface mixed layer. Sixty-four taxa were recorded in this layer with Benthosema panamense, Selar crumenophthalmus and Syacium ovale as the dominant species. In the oxycline a mean density of 7.4 larvae per 100 m³ was recorded with 40 taxa. Triphoturus mexicanus, B. panamense and Vinciguerria lucetia were the dominant species. The lowest mean larval density was (1 larvae per 100 m³) in the hypoxic layer, where only 4 taxa were recorded. Results showed that the highest density and richness of larvae were found in the mixed and oxycline layer, where the Gulf of California Water was observed, contrasting with the low presence of larvae in the Subtropical Subsurface Water domain, water mass characterized by low dissolved oxygen concentration. Its vertical expansion in the main entrance of the Bahía de La Paz, might constrain the fish larvae distribution and survival.

Bahía de La Paz的特点是生物多样性高，与Alfonso盆地所在的加利福尼亚湾有密切的交流。分析了2022年10月阿方索盆地鱼类幼虫水平和垂直分布与水柱结构的关系。记录到两个水团，加利福尼亚湾水团，从140 m深度到地面，亚热带次表层水团，在第一个水团以下。从表层混合层、氧层和低氧层3个深度层采集鱼苗，低氧层溶解氧浓度较低（44 μmol kg−1）。鱼苗平均密度以表层混合层最高，为27.9条/ 100 m3；该层共记录到64个分类群，优势种为Benthosema panamense、Selar crumenophthalmus和Syacium ovale。氧斜层40个类群平均密度为7.4只/ 100 m3。优势种为墨西哥三角龙、巴拿马白背龙和白刺龙。低氧层平均幼虫密度最低（1只/ 100 m3），仅有4个类群。结果表明，在加利福尼亚湾水域的混合氧斜层中幼虫密度和丰富度最高，而在以溶解氧浓度低为特征的亚热带次表层水域中幼虫数量较少。它在Bahía de La Paz主入口的垂直扩张，可能会限制鱼类幼虫的分布和生存。

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引用次数: 0

Utility of satellite imagery in estimating coastal marine water attributes 卫星图像在估算沿海海水属性中的应用

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-06-20 DOI: 10.1016/j.csr.2025.105509

Abdul Majid, Natrah Ikhsan, Zafri Hassan

Coastal water resources are essential for sustaining biodiversity and community well-being, yet rapid population growth and climate change increasingly threaten their sustainability. Satellite remote sensing has emerged as a powerful tool for monitoring coastal water quality due to its extensive spatial coverage, cost effectiveness, and rapid data acquisition. The scientific community has seen considerable advances in recent years through these technologies. In view of these developments, this study presents a scoping review of 465 peer-reviewed journal articles published between 2019 and 2024, sourced from Scopus. The analysis identifies commonly used satellite platforms for assessing five critical water quality parameters chlorophyll-a (Chl-a), temperature, colored dissolved organic matter (CDOM), pH, and phosphate across predefined climatic zones and water types. We further examine prevalent algorithmic approaches and validation metrics. Findings indicate that most studies rely on data from Aqua, Sentinel, and Landsat satellites. Results also reveal that Chl-a and temperature are the most widely measured parameters, particularly in temperate and subtropical marine waters, whereas Arctic regions and freshwater systems remain understudied. Recent trends show a growing reliance on empirical and machine learning based algorithms, with root mean square error (RMSE) and coefficient of determination (R²) as the most common validation metrics. These results highlight the need for standardized validation protocols and expanded research efforts in underrepresented regions and parameters to enhance global water quality monitoring.

沿海水资源对维持生物多样性和社区福祉至关重要，但人口快速增长和气候变化日益威胁到其可持续性。卫星遥感由于其广泛的空间覆盖、成本效益和快速的数据获取，已成为监测沿海水质的有力工具。近年来，通过这些技术，科学界已经看到了相当大的进步。鉴于这些发展，本研究对2019年至2024年间发表的465篇同行评议期刊文章进行了范围审查，这些文章来自Scopus。该分析确定了常用的卫星平台，用于评估五个关键水质参数：叶绿素-a （Chl-a）、温度、彩色溶解有机质（CDOM）、pH值和磷酸盐，跨越预定的气候带和水类型。我们进一步研究了流行的算法方法和验证指标。研究结果表明，大多数研究依赖于Aqua、Sentinel和Landsat卫星的数据。结果还表明，Chl-a和温度是最广泛测量的参数，特别是在温带和亚热带海水中，而北极地区和淡水系统仍未得到充分研究。最近的趋势表明，越来越依赖于基于经验和机器学习的算法，均方根误差（RMSE）和确定系数（R2）是最常见的验证指标。这些结果强调需要标准化的验证方案，并在代表性不足的地区和参数中扩大研究工作，以加强全球水质监测。

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引用次数: 0

Comparing and improving different methods to quantify silt and clay abundance within estuarine mud 比较和改进不同方法量化河口泥中粉砂和粘土丰度

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-06-16 DOI: 10.1016/j.csr.2025.105508

G. Mariotti , A. Tweel , G. Gababa , A.K. Tymul

Estuarine mud (also referred to as “fine-material”) is comprised of clay and silt particles, whose settling velocity differs by up to four orders of magnitude. Hence, quantifying their relative abundance within the mud fraction is key to understand and predict estuarine mud dynamics. Here we improve this quantification, using mud from two differing estuaries, one with a low clay-mud ratio (Massachusetts, northeast coast of USA) and one with a high clay-mud ratio (South Carolina, southeast coast of USA). First, we compare four different laboratory methods (XRD, laser diffraction, pipette method, Owen tube) to estimate the clay-mud ratio. Estimates based on laser diffraction are confounded by the fact that particles in the 2–30 μm size class could be either silt or “hyper-stable clay aggregates”, but this can be resolved by using the particle size distribution of pure clay as a reference. With this correction, laser diffraction agrees with the other three methods. Second, we show that optical backscatter (turbidity) and acoustic backscatter provide – at least under laboratory settings – a good estimate of suspended clay and silt, respectively. These two measurements correctly estimate the clay-mud ratio of the two samples, and also provide an estimate of silt and clay settling velocity in still water. These velocities are consistent with those from standard settling tests (Owen tube). Turbidity and acoustic backscatter should be able to monitor suspended clay and silt concentration in the field, provided that sand is negligible.

河口泥（也被称为“细物质”）由粘土和淤泥颗粒组成，其沉降速度相差高达四个数量级。因此，量化它们在泥浆组分中的相对丰度是理解和预测河口泥浆动力学的关键。在这里，我们改进了这一量化，使用来自两个不同河口的泥浆，一个具有低粘土-泥浆比（马萨诸塞州，美国东北海岸），另一个具有高粘土-泥浆比（南卡罗来纳州，美国东南海岸）。首先，我们比较了四种不同的实验室方法（XRD，激光衍射，移液法，欧文管）来估计粘土-泥浆比。2-30 μm粒径的颗粒可能是粉砂或“超稳定粘土团聚体”，这一事实使基于激光衍射的估计混淆，但这可以通过使用纯粘土的粒径分布作为参考来解决。通过这种修正，激光衍射与其他三种方法一致。其次，我们表明光学后向散射（浊度）和声学后向散射（至少在实验室设置下）分别提供了悬浮粘土和淤泥的良好估计。这两个测量正确地估计了两个样品的粘土-泥浆比，也提供了淤泥和粘土在静水中沉降速度的估计。这些速度与标准沉降试验（欧文管）的结果一致。浊度和声波后向散射应该能够监测现场的悬浮粘土和淤泥浓度，前提是沙子可以忽略不计。

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引用次数: 0

Ingestion of prey intensifies microplastic load in Mediterranean commercial fish 食入猎物会加剧地中海商业鱼类的微塑料负荷

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research

Pub Date : 2025-06-10 DOI: 10.1016/j.csr.2025.105496

Alessandra Cera , Silvia Secco , Iliana Matarazzi , Monica Orsini , Serena De Santis , Massimiliano Scalici

We describe the ingestion of plastics by four edible fish species from the Western Mediterranean Sea (Fiumicino, Italy): Micromesistius poutassou, Mullus barbatus, Sardina pilchardus, and Trachurus trachurus. Microparticles smaller than 1 mm, particularly blue fibres made of cellophane, are the most found in terms of size, colour, shape, and polymer. The highest level of contamination was found in Sardina pilchardus and in stomachs containing prey across all species. We have gathered evidence from commercially relevant fishes, of which two can be good bioindicators of microplastics (M. barbatus and T. trachurus), and one is poorly investigated (M. poutassou) in order to contribute to the overall assessments of the MP-induced risks for the Mediterranean ecosystem and human activity.

我们描述了来自西地中海（Fiumicino, Italy）的四种可食用鱼类对塑料的摄入：Micromesistius poutassou， Mullus barbatus， Sardina pilchardus和Trachurus Trachurus。小于1毫米的微粒，特别是由玻璃纸制成的蓝色纤维，在大小、颜色、形状和聚合物方面都是最常见的。污染程度最高的是沙丁鱼和所有物种的猎物胃。我们从与商业相关的鱼类中收集了证据，其中两种可以作为微塑料的良好生物指标（barbatus和T. trachurus），另一种研究较少（M. poutassou），以有助于对mp引起的地中海生态系统和人类活动风险的总体评估。

引用次数: 0