Marine Geology最新文献

{"title":"Environmental changes in the Okinawa Trough over the last 88 ka BP: Evidence from high-resolution bulk mineralogy","authors":"Lingfeng Luo ,&nbsp;Xuguang Feng ,&nbsp;Jianjun Zou ,&nbsp;Xisheng Fang ,&nbsp;Xinru Xue ,&nbsp;Ruxi Dou ,&nbsp;Baohua Han ,&nbsp;Qingchao Wang ,&nbsp;Aimei Zhu ,&nbsp;Zhi Dong ,&nbsp;Gang Yang ,&nbsp;Xuefa Shi","doi":"10.1016/j.margeo.2025.107699","DOIUrl":"10.1016/j.margeo.2025.107699","url":null,"abstract":"<div><div>Deciphering sediment source-to-sink processes along the continental margin remains a frontier in marine sedimentology and paleoenvironmental research. The thick sedimentary sequences in the East China Sea and the Okinawa Trough provide an ideal setting for deciphering the riverine sediment discharge from East Asian rivers into the ocean and the evolution of the Kuroshio Current. While various proxies have been used to investigate sedimentary processes and paleoenvironmental evolution in the Okinawa Trough, debates persist regarding the variation processes, spatial patterns, and controlling mechanisms of sediment fluxes during the late Quaternary. Here, we present high-resolution bulk minerals from core CSH1 in the northern Okinawa Trough to investigate variations in terrigenous sediment composition, provenance, and fluxes over the last 88 ka BP. Dominant minerals in core CSH1 include quartz, plagioclase, mica, and calcite. Notably, calcite content and the calcite/quartz ratio exhibit lower values in glacials and higher values in interglacials, predominantly reflecting biogenic input. Enhanced Kuroshio Current facilitated warm and nutrient-rich waters to the northern Okinawa Trough and stimulate high calcareous productivity during interglacials. Quartz, plagioclase, and mica are typical detrital minerals, primarily derived from the East Asian continent and the Japan island arc. Sediment provenance indicates that the Changjiang and the Huanghe mixed inputs dominated during Marine Isotope Stage (MIS) 5.1, the Huanghe inputs dominated during MIS 4 to MIS 2, while Japan island arc volcaniclastic contributions increase significantly after 8 ka BP. Sea-level exerts a first-order control on terrestrial sediment supply. Other factors including East Asian Summer Monsoon, Kuroshio Current variability, and paleo-eustasy positioning have secondary influence on sediment pattern of the Okinawa Trough.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107699"},"PeriodicalIF":2.2,"publicationDate":"2025-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphological response and recovery of a headland-bay beach under sequential typhoon impacts","authors":"Qi Chen ,&nbsp;Yang Zhang ,&nbsp;Fangting He ,&nbsp;Shihao Liu ,&nbsp;Ya Ping Wang ,&nbsp;Jianjun Jia","doi":"10.1016/j.margeo.2025.107698","DOIUrl":"10.1016/j.margeo.2025.107698","url":null,"abstract":"<div><div>Climate change is increasing the frequency and severity of coastal hazards, with rising sea levels and intensifying typhoons accelerating coastal erosion worldwide. Although headland-bay beaches are widely regarded as topographically protected, they are not immune to substantial erosion during intense typhoons. However, their morphodynamic responses to extreme events—particularly sequential typhoon impacts—remain poorly quantified and mechanistically understood, largely due to the lack of high-resolution monitoring. Here we examine Dasha Beach in Zhejiang Province, China, using high-resolution UAV-derived topography to quantify morphological changes associated with two sequential typhoons, Hinnamnor and Muifa, in September 2022. Hinnamnor generated 9827 m³ of net erosion concentrated in the central beach, and Muifa caused an additional 6370 m³ of erosion, completely removing the remaining beach berm. Post-typhoon recovery deposited 7352 m³ of sediment, predominately reconstructing the northern beach berm, and restoring volumes to pre-Muifa but not pre-Hinnamnor levels. Hydrodynamic analyses reveal pronounced cross-bay gradients in wave energy, with stronger forcing in the northern sector producing enhanced erosion during the typhoons and greater accretion during recovery. During typhoons, waves primarily drove cross-shore sediment transport. In the recovery phase dominated by obliquely incident waves, however, waves facilitated both cross-shore and longshore sediment transport. Swash processes (uprush and backwash) dominated sediment transport, while water-level variations controlled its spatial extent. Specifically, Muifa-induced high water levels combined with energetic waves led to severe berm erosion. The stable berm sediments, derived from well-sorted backshore and dune areas, exhibited minimal grain-size change under typhoon impact. The coarser sediments indicate that the depositional material during the recovery phase originated from the submarine seabed. Although Dasha Beach currently exhibits substantial short-term resilience, increasingly frequent and intense typhoons will pose escalating challenges. Therefore, the assessment of the need for human intervention on the beach and the design of appropriate beach nourishment schemes are among the key focuses for future research. Overall, these findings refine the process-based understanding of storm-driven morphodynamics, and provide a basis for safeguarding headland-bay beach stability.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107698"},"PeriodicalIF":2.2,"publicationDate":"2025-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early Pleistocene (1.94–1.46 Ma) records for the upper Mediterranean Outflow Water branch reveal low and high latitude climate influences","authors":"Antje H.L. Voelker ,&nbsp;Emanuelle Ducassou ,&nbsp;Barbara Balestra ,&nbsp;Jose Abel Flores ,&nbsp;Gary D. Acton ,&nbsp;Carl Richter ,&nbsp;Chuang Xuan ,&nbsp;Johanna Lofi ,&nbsp;Ana Alberto ,&nbsp;Henning Kuhnert ,&nbsp;Carlos A. Alvarez Zarikian","doi":"10.1016/j.margeo.2025.107697","DOIUrl":"10.1016/j.margeo.2025.107697","url":null,"abstract":"<div><div>The Mediterranean Outflow Water (MOW), modified by paleoceanographic conditions and tectonic processes, played a significant role in the formation of sediments drifts along the Iberian Margin. Using sediment samples from IODP Hole U1387C, we explore the Early Pleistocene history of the upper MOW core above the central Faro Drift in the Gulf of Cádiz. The time series of benthic foraminifer stable isotope and grain size related data have a rigorous stratigraphic framework consisting of nannofossil biostratigraphy and paleomagnetic and δ¹⁸O stratigraphy. The paleoenvironmental records are supplemented by natural gamma ray downhole logging data. Above the hiatus associated with the youngest dolostone, sandy to muddy contourite sedimentation started at 1.946 Ma, i.e., within Marine Isotope Stage (MIS) 74, at IODP Site U1387, slightly younger than at IODP Site U1389. Formation of contourite layers, reflected in the sortable silt and sand percentage records, strongly reacted to precession forcing, including semi- and quarter-precession cycles. The majority of the contourite beds developed during stadial (colder) climate periods, like previous observations from the Early to Late Pleistocene. Formation of contourite layers within MIS 53, MIS 55 and MIS 65, however, appear to be linked to the prevailing atmospheric conditions over North Africa. Periods of poor ventilation in the upper MOW were linked to insolation maxima and reduced ventilation in the Mediterranean Sea. Here, MIS 51 presents a peculiar case as poor ventilation reached from the surface to the lower North Atlantic Deep Water range, reflecting unique interglacial conditions that merit future exploration.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107697"},"PeriodicalIF":2.2,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geomorphic control of wave run-up by berm morphology on sandy beaches","authors":"Yingtao Zhou ,&nbsp;Zheng Li ,&nbsp;Yu Zhu ,&nbsp;Yuanshu Jiang ,&nbsp;Xi Feng ,&nbsp;Weibing Feng ,&nbsp;Yulong Xue ,&nbsp;Jutong Zhang","doi":"10.1016/j.margeo.2025.107692","DOIUrl":"10.1016/j.margeo.2025.107692","url":null,"abstract":"<div><div>This study aims to advance the current understanding of the role that the berm plays in modulating wave run-up dynamics for elevation control purposes. Accurate prediction of wave run-up is essential for coastal hazard assessment and management, yet existing empirical models often fail to account for the dynamic influence of berm morphology. This study introduces a new empirical formula for wave run-up that solves the current wave run-up empirical formula can not adequately consider the instantaneous changes in the berm (including width, elevation, and onshore slope). Using field measurements from sandy beaches in Haikou, China, combined with numerical simulations (XBeach) and video-derived run-up data from a Coastal Shore-based Video Imagery Monitoring System (COSVIMS), we analyze run-up behavior on composite-profile beaches featuring a gentle berm and steep dune. Results demonstrate that berm geometry significantly attenuates run-up: a higher and wider berm reduces both vertical elevation and horizontal extent of run-up. The proposed model which including berm height (<em>h</em>_<em>B</em>), berm platform length (<em>L</em>_<em>B</em>), and the onshore slope of the berm ridge (<em>β</em>_<em>Son</em>) outperforms established formulations across multiple international beach datasets, showing higher correlation and lower root-mean-square error (RMSE = 0.046) than old models. By capturing real-time feedback between berm evolution and run-up, this improved formula resolves the issue of asynchrony between hydrodynamics and run-up, thereby providing a robust basis for real-time calculations of wave-topography interactions.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107692"},"PeriodicalIF":2.2,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Taphonomic signature of benthic foraminifera linked to methane release in the Barents Sea","authors":"Gabriella M. Boretto ,&nbsp;Mathia Sabino ,&nbsp;Fiorenza Torricella ,&nbsp;Gianmarco Ingrosso ,&nbsp;Alessio Nogarotto ,&nbsp;Giuliana Panieri ,&nbsp;Jens Hefter ,&nbsp;Gesine Mollenhauer ,&nbsp;Leonardo Langone ,&nbsp;Silvia Giuliani ,&nbsp;Tommaso Tesi ,&nbsp;Lucilla Capotondi","doi":"10.1016/j.margeo.2025.107693","DOIUrl":"10.1016/j.margeo.2025.107693","url":null,"abstract":"<div><div>This study investigates methane seepage dynamics over the past several centuries in the southwestern Barents Sea through an integrated analysis of foraminiferal taphonomy, stable carbon isotopes, and the lipid biomarkers glycerol dialkyl glycerol tetraethers (GDGT) based molecular biomarkers. We examined the preservation state of nine calcareous benthic foraminiferal species from sediment core HH1141, grouping test alterations into five taphonomic categories. These preservation patterns correlate with geochemical indicators of methane emissions, such as depleted δ¹³C values of carbonate tests and organic matter and elevated Methane Index (MI), allowing the identification of three stratigraphic units reflecting distinct seepage regimes. Along with this gradient, electron microscopy and microprobe analyses reveal widespread diagenetic overgrowths and mineral replacements linked to anaerobic oxidation of methane. Furthermore, species-specific responses highlight that <em>Elphidium clavatum</em>, <em>Stainforthia feylingi</em>, <em>Stainforthia loeblichi</em> and <em>Cassidulina reniforme</em> are more susceptible to alteration, while <em>Melonis barleeanus</em> shows remarkable resistance. The observed temporal variability in methane seepage is interpreted as the result of multifactorial environmental drivers, including changes in subsurface dynamics and bottom-water conditions. This multidisciplinary approach demonstrates the utility of foraminiferal taphonomy as a sensitive proxy for methane-rich environments and cold seep evolution, especially in polar regions undergoing rapid climatic and oceanographic change.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107693"},"PeriodicalIF":2.2,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anthropogenic disturbances drive stepwise geomorphic changes of shoal-channel systems in a tide-dominated estuary","authors":"Ping Zhang ,&nbsp;Linxi Fu ,&nbsp;Xiangyuan Li ,&nbsp;Jianliang Lin ,&nbsp;Huayang Cai ,&nbsp;Zhijun Dai ,&nbsp;Qingshu Yang","doi":"10.1016/j.margeo.2025.107694","DOIUrl":"10.1016/j.margeo.2025.107694","url":null,"abstract":"<div><div>The shoal-channel system, a fundamental geomorphic feature in estuaries globally, plays a crucial role in ensuring navigational safety and sustaining estuarine-deltaic ecosystem services. However, in the Anthropocene, this system has undergone significant transformations, challenging its stability and functional integrity. To investigate these changes, we applied a Digital Elevation Model (DEM) and Morphological Shannon Entropy (MSE) to quantify the stepwise evolution of the shoal-channel system in the Shiziyang (SZY) Tidal Channel, a tide-dominated reach of the Pearl River Estuary (PRE). Our findings reveal that anthropogenic disturbances triggered a systematic eastward channel migration, progressive shoal expansion, and peak erosion of 2.37 × 10⁶ m³/yr during Period III (1989–2000), exceeding concurrent deposition by 50 %. These changes culminated in a systemic reconfiguration from a V-shaped to a W-shaped channel profile. Sequential dredging emerged as the principal driver, accounting for a 17 m incision and contributing up to 68.45 % of the total scouring in Period III. Additional factors, including port construction (which reduced channel width by 20.39 %), diminished sediment flux (causing a 27.65 % decrease in depositional bank extent), and intensified hydrodynamics (reflected by a tidal range increase of 4.56 mm/yr), acted synergistically to amplify the regime shift. By elucidating the key drivers and consequences of this geomorphic evolution, our study provides critical insights for the sustainable management of heavily engineered coastal systems in the Anthropocene.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107694"},"PeriodicalIF":2.2,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The updated distribution of clay minerals in the World Ocean","authors":"Taylor R. Lee ,&nbsp;Taylor Vander ,&nbsp;Trilby Hill ,&nbsp;Jeffrey Obelcz ,&nbsp;Benjamin Phrampus ,&nbsp;Jordan Graw","doi":"10.1016/j.margeo.2025.107695","DOIUrl":"10.1016/j.margeo.2025.107695","url":null,"abstract":"<div><div>Clay mineral content in marine sediments is central to a wide variety of applications in the marine geosciences, including paleoclimate reconstruction and slope stability analyses. Most studies are not applicable to a global scale, focusing on single locations or regional areas. Additionally, dominant clay mineral data (kaolinite, illite, smectite, chlorite) are not curated for “big data” applications necessary to produce estimates on a global scale. Geospatial machine learning (GML) techniques have successfully produced global predictions of geological seafloor properties, such as sedimentation rate and total organic carbon. Here, we curate observed data of dominant clay mineral concentration for use in a GML algorithm to predict global surficial (&lt; 1 m) seafloor estimates of relative clay mineral abundances. Our global seafloor clay mineral predictions are qualitatively similar to previous global estimates, but have more dynamic range and finer-scale spatial variation. Our results show that GML predictions are the best data-driven estimate (∼2-3× decrease in error) of clay mineral concentration where it has not been previously measured.</div></div><div><h3>Plain language summary</h3><div>Clay minerals in marine seafloor sediments are important to a variety of marine geology applications including reconstructing ancient climates and assessing slope instability hazards. Most of these studies publish sparse data that is limited to particular regions of the world. The inconsistent formatting of these data makes it difficult to utilize in a “big data” framework (e.g., machine learning applications). We harvest thousands of sparse clay mineral observations from a variety of different public sources including literature and repositories. We standardize these data in a manner compatible with machine learning efforts. We then utilize machine learning algorithms to estimate the global distribution of dominant clay minerals in shallow marine seafloor (&lt; 1 m) sediments. Finally, we compare our predictions with previously published maps. Our predictions are descriptively similar, but statistically more accurate.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107695"},"PeriodicalIF":2.2,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gran Roque Island partly submerged by a 2500-year-old tsunami, Los Roques Archipelago, Venezuela Leeward Antilles Islands","authors":"Franck A. Audemard M. ,&nbsp;Carlos E. Reinoza Gómez ,&nbsp;Jesús Rafael Padilla Vásquez ,&nbsp;Melody Philippon ,&nbsp;Gabriela Quintana Sánchez ,&nbsp;Valerie Clouard ,&nbsp;Jean Roger ,&nbsp;Sirel Colón Useche ,&nbsp;Alejandra Fabiola Leal Guzmán ,&nbsp;José Alejandro Méndez Dot ,&nbsp;Jean-Frédéric Lebrun","doi":"10.1016/j.margeo.2025.107696","DOIUrl":"10.1016/j.margeo.2025.107696","url":null,"abstract":"<div><div>Gran Roque Island (GRI), as the most northeastern salient of the Los Roques Archipelago, has been affected by several extreme-wave events (EWEs), as is recorded by several coastal boulder deposits (CBDs). The particular shape of its windward elevated coast and of its rather simple geology made of 2-end components: on one hand Mesozoic meta-igneous mafic rocks, and on the other Holocene sedimentary environments of typical active carbonate reef systems, allow differentiating a foreshore-lying CBD built by frequent storm and hurricanes from an inland CBD, which was deposited by a much larger and unusual EWE (tsunami). The former CBD is the source of the latter one. The source of this tsunami-transported CBD is unequivocal and forms and accumulates in the seashore of the Mal Viento Bay, the only opening of GRI to the North. This latter singularity also allows proposing that this 2500 yr cal BP tsunami must have generated in the northeastern Caribbean, because of the narrow opening to the North of this bay. A tsunamigenic earthquake about that time seems to have impacted, at least: a) Saint Thomas (Virgin Islands), b) lagoon Guichard in Saint Martin, c) 3 localities along the Atlantic coast of Martinique and d) Gran Roque Island (GRI). This pre-Current Era event now appears to have several run-ups at different localities. In the case of GRI, it has entrained blocks of diabase as heavy as 8.5–9 tons (volume of 3 m³) over a foreshore top of 2.2 m above msl, requiring a flow depth of 8.2 m. In a more realistic estimation, if the largest block is approximated to a 1-m-diameter, 3-m-long cylinder (volume of 2.35 m³ and ≈ 7 tons), a 6.5 m tsunami wave may have been sufficient to transport it inland by rolling/saltation.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107696"},"PeriodicalIF":2.2,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphodynamics of a composite barrier system, Westward Ho!, North Devon, UK","authors":"C.L. Rimmer,&nbsp;G. Masselink,&nbsp;M. Wiggins,&nbsp;L. Biermann","doi":"10.1016/j.margeo.2025.107684","DOIUrl":"10.1016/j.margeo.2025.107684","url":null,"abstract":"<div><div>Understanding and predicting the morphodynamic evolution of gravel barrier systems is essential for coastal management, as these features provide natural protection for infrastructure and ecosystems. This study uses the composite gravel barrier system of Westward Ho!, south west England, characterised by a sandy intertidal region and a gravel high tide ridge, to quantify the morphological behaviour of this barrier system and link the dynamics to the external forcing, notably sea-level rise and waves. Since 1887, the barrier has retreated by 97 m, with an average retreat rate of 0.71 m yr⁻¹. Over the period 2007–2024, the system lost approximately 216,000 m³ of sediment, equivalent to 3.6 m³ m⁻¹ yr⁻¹. It is suggested that most of this material was transported to a beach-dune system north of the barrier, across an estuary. Over the past two decades, the retreat rate of the southern section has slowed to 0.18 m yr⁻¹, while the retreat rate of the northern section has increased to 2.39 m yr⁻¹. This suggests segmentation is occurring, with the southern end becoming swash-aligned and the northern end drift-aligned. Morphological changes did not strongly correlate with SLR or wave power (cross-shore or longshore). The low-tide shoreline appears near equilibrium with prevailing wave direction, but the gravel ridge is slightly misaligned, suggesting net northward sediment transport. Given current trends, the barrier is expected to continue retreating and losing sediment for several decades. However, a comprehensive understanding of the system's future behaviour requires development of a mixed-sediment morphodynamic model.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107684"},"PeriodicalIF":2.2,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decadal shoreline variability in urban beaches: Contributions from structural changes, storms, and nourishments to tipping points","authors":"J. Guillén,&nbsp;G. Simarro","doi":"10.1016/j.margeo.2025.107683","DOIUrl":"10.1016/j.margeo.2025.107683","url":null,"abstract":"<div><div>The beaches of Barcelona are sediment-starved, heavily engineered, and subject to frequent human interventions. Over two decades of daily shoreline data obtained through video monitoring have yielded a comprehensive dataset, which is analysed to evaluate decadal shoreline dynamics, anthropogenic influences, and interactions with wave forcing across multiple urban beaches. Despite an overall erosive trend, shoreline retreat has been intermittently counteracted by periodic sand nourishments and the construction of coastal protection structures. A statistical definition of equilibrium shoreline position is introduced based on the frequency distribution of shoreline locations and potential drivers of abrupt shifts (“tipping points”) in shoreline behavior are identified. The analysis includes assessments of post-nourishment retreat rates and explores correlations between shoreline change and storm wave energy. While individual beach responses exhibit moderate correlation with wave energy, this relationship becomes more robust when data are aggregated over longer temporal windows or spatially across all beaches, highlighting the relevance of local controls. These findings provide a valuable first-order framework for anticipating shoreline behavior in urban beach settings and inform future coastal management strategies, although further refinement through advanced morphodynamic modeling is recommended to enhance predictive accuracy.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"492 ","pages":"Article 107683"},"PeriodicalIF":2.2,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145622912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}