Marine Geology最新文献

{"title":"Submerged bedrock shore platforms, Orkney Islands, UK: A new record of significant, though chronologically uncertain sea-level change and coastal erosion","authors":"Dayton Dove ,&nbsp;Tom Bradwell ,&nbsp;Natasha L.M. Barlow","doi":"10.1016/j.margeo.2025.107577","DOIUrl":"10.1016/j.margeo.2025.107577","url":null,"abstract":"<div><div>Reconstructions of sea level change in NW Europe are primarily based on records of relative sea level (RSL) recovered from terrestrial environments, above modern sea level. This deficit in marine-based records results from the highly limited number of sea level indicators observed in modern submarine settings, as well as the often-limited absolute chronology information available. This sampling bias introduces significant uncertainty in former RSL predictions, negatively impacting efforts to accurately model ice-sheet histories and isostatic response. Here we present new seabed mapping data (i.e. high-resolution multibeam bathymetry) from northern Scotland to address this data gap. Encircling the Orkney Islands we identify an exceptional sequence of submerged terraces ranging from -5 to -95 m below modern sea level, carved in bedrock. We interpret these bedrock terraces as relict shore platforms, based on their spatial distribution and a range of geomorphological characteristics. Shore platform development was linked to contemporaneous landward coastline erosion and cliff formation, and each landform pair (i.e. terrace = shore platform and accompanying seacliff / escarpment) likely represents a single sea-level stillstand event of considerable duration (possibly millennia). These wide and well-preserved shore platforms attest to formation during multiple, separate periods of RSL stillstand, and we estimate that 5–7 RSL stillstands are recorded offshore Orkney. We discuss their potential age – spanning more than the last glacial cycle (i.e. Middle - Late Pleistocene) – and explore the wider implications for Quaternary coastal erosion and sea-level change in the region. This study shows how marine geological data and geomorphological analysis can be used to identify palaeo-sea-level indicators within a glacio-isostatically complex region. Despite a current lack of absolute chronological constraint, we believe these observations may provide crucial information towards understanding sea level change within the NW European region.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"487 ","pages":"Article 107577"},"PeriodicalIF":2.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070405","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":"Evidence for mixing of migrated hydrocarbons and indigenous organic matter in the Paleocene deepest core in IODP Expedition 378 Hole U1553D, Campbell Plateau, New Zealand","authors":"Simon C. George ,&nbsp;Lian Jiang ,&nbsp;Blanca Ausín ,&nbsp;Eleni Anagnostou ,&nbsp;Ann G. Dunlea ,&nbsp;Laurel B. Childress ,&nbsp;Ursula Röhl ,&nbsp;Deborah J. Thomas","doi":"10.1016/j.margeo.2025.107576","DOIUrl":"10.1016/j.margeo.2025.107576","url":null,"abstract":"<div><div>International Ocean Discovery Program (IODP) Expedition 378 recovered a continuous, &gt; 580 m thick Paleogene sedimentary sequence at Site U1553 on the Campbell Plateau, south of the South Island of New Zealand. Oil stain samples are rarely recovered during scientific ocean drilling, but one was recovered from the deepest Paleocene core in Hole U1553D (579.94 m CSF-A), associated with high amounts of methane and wet gases detected by on-board instrumentation, that led to drilling any deeper being prevented. This oil stain was analysed by gas chromatography–mass spectrometry and gas chromatography–triple quadrupole mass spectrometry, and compared with the indigenous Paleocene organic matter.</div><div>The <em>n</em>-alkane distribution of the oil stain sample is bimodal, suggesting mixing of a thermogenic migrated oil with a signal from the indigenous Paleocene sediments. This is confirmed by the ≥C₂₇ hopanoid and steroid biomarkers in the oil stain sample which are very similar to the immature Unit Vb early Paleocene sediments, including the presence of neohop-13(18)-enes, ββ hopanes, and βαα steranes. The C₁₀–C₂₀ aromatic compound distributions are in the molecular weight range where there is a mixed signal. The migrated thermogenic oil and gas were derived from a marine source rock containing a significant contribution from terrigenous and probably coniferous organic matter, deposited in a dysoxic depositional environment. Vertical migration of thermogenic oil and gas penetrated the early Paleocene sediments, but did not reach into the Eocene section due a significant permeability barrier associated with a middle–late Paleocene unconformity. Deeper drilling and geophysical investigation are required to understand the putative Cretaceous or older strata in this region.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107576"},"PeriodicalIF":2.6,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932036","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":"Morphology and Holocene activity of a high-latitude Canyon – Channel system: The proximal Lofoten Basin channel system (Norwegian Sea)","authors":"Hilde B. Amundsen ,&nbsp;Jan Sverre Laberg,&nbsp;Daniel H. Wiberg ,&nbsp;Tom Arne Rydningen,&nbsp;Amando P.E. Lasabuda ,&nbsp;Stine Bjordal-Olsen,&nbsp;Matthias Forwick","doi":"10.1016/j.margeo.2025.107574","DOIUrl":"10.1016/j.margeo.2025.107574","url":null,"abstract":"<div><div>Canyon – channel systems have the potential to be biological and marine litter “hotspots”, and they can act as important carbon sinks. However, knowledge about the modern (Holocene) activity of many of these systems remains poor. This includes the high-latitude Andøya Canyon - Lofoten Basin Channel located in the Norwegian Sea (∼69^oN). This study focuses on the proximal Lofoten Basin Channel and associated deposits (the Andøya Canyon is previously reported). The Lofoten Basin Channel includes two channel branches representing the canyon continuation beyond the foot of the continental slope, terminating in an area resembling a braidplain including braided channels, bars, as well as MTDs. Sediment cores included sandy turbidites. Based on their age and Ca/Fe ratios, we infer that the youngest sandy turbidites were deposited during the same event, suggesting that the event covered an area of c. 120 km × 20 km. Assuming an average thickness of ∼10 cm, this result in a volume of ∼0,24 km³ of terrigenous sand deposited in the basin over an area of ∼2400 km² sometime during the period from 3.7 to 2.4 kyrs BP. This equals a sand thickness of 4.8 m in the c. 50 km long and 1 km wide thalweg part of the Andøya Canyon, here considered to be the source area. The sand could derive from failure of sandy accumulations within the canyon and/or from sand piracy. Another aspect of this Holocene turbidite event is that it represented a substantial export of inorganic carbon into the deep sea which in this way got buried, representing a carbon sink removing carbon from the carbon cycle (a carbon draw-down effect). These results shows that the canyon is a potential source and route for sediments that may cover ∼2400 km² of the sea floor, large deep-sea areas that also represent carbon sinks so far not well accounted for.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107574"},"PeriodicalIF":2.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902161","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":"Testing spatial interpolation methods for deep-time organic carbon burial in epicontinental seas by taking Sunda Shelf as an example","authors":"Yida Yang ,&nbsp;Pengfei Ma ,&nbsp;Xiumian Hu ,&nbsp;Yuan Gao ,&nbsp;Chengshan Wang","doi":"10.1016/j.margeo.2025.107566","DOIUrl":"10.1016/j.margeo.2025.107566","url":null,"abstract":"<div><div>Quantifying the burial of organic carbon (OC) in epicontinental seas is crucial for understanding its role in regulating global long-term carbon cycle and climate. Utilizing spatial interpolation methods, prior works have quantified OC burial globally or regionally based on limited, unevenly distributed measurements. However, there remains a notable lack of comparative studies and assessments regarding their applicability and uncertainty in deep-time research. Taking the middle Miocene Sunda Shelf OC burial estimation as an example, four popular spatial interpolation methods are assessed quantitatively and qualitatively, including Thiessen polygons, Inverse Distance Weighting (IDW), Ordinary Kriging (OK) and Random Forests (RF). Based on quantitative and qualitative evaluation, the data-driven RF method demonstrates superior performance due to fewer assumptions, effectively capturing nonlinear relationships and complex spatial patterns in heterogeneous, non-Gaussian deep-time data, and demonstrating strong generalizability and robustness. High-resolution RF-based reassessment reveals significant spatial-temporal heterogeneity of OC burial on the Sunda Shelf between the Miocene Climatic Optimum (MCO) and Middle Miocene Climate Transition (MMCT). Although the overall OC burial and sediment accumulation rates (SAR) increase during the MMCT, notable spatial discrepancies emerge, with OC burial rates elevated near basin margins but decreased in distal regions. These variations primarily reflect the combined influences of eustatic sea-level fall and enhanced terrigenous input, highlighting the complex interplay of factors modulating OC burial efficiency. Machine learning methods such as RF prove highly effective in handling deep-time spatial data, but their application should be adapted to specific objectives, geological conditions, and data characteristics.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107566"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886871","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":"Longitudinal transport of net suspended sediment in the river-dominated Modaomen Estuary of the Pearl River: Effects of river, tide, and mouth bar","authors":"Xinran Li ,&nbsp;Feng Liu ,&nbsp;Hao Zou ,&nbsp;Chao Tan ,&nbsp;Jie Huang ,&nbsp;Sihao Mo ,&nbsp;Haiwei Li ,&nbsp;Rongyao Xie ,&nbsp;Heng Wang","doi":"10.1016/j.margeo.2025.107575","DOIUrl":"10.1016/j.margeo.2025.107575","url":null,"abstract":"<div><div>The suspended sediment dynamics in estuaries are strongly affected by the interaction of rivers, tides, and morphological factors. However, little is known about the combined impact of these driving factors on longitudinal net sediment transport. A field investigation of current velocity, salinity, and suspended sediment concentration (SSC) was conducted in the Modaomen Estuary of the Pearl River. Hydrological data were simultaneously measured at three mooring stations in the longitudinal direction on July 31, and August 8, 2017, covering a neap tide and a spring tide. Net suspended sediment transport patterns were also analyzed. Current velocity, SSC, and salinity exhibited spatial and temporal variations during the spring–neap tides. Seaward net sediment transport was dominant during the observation period and, vertically, double patterns of net sediment transport inside and outside the mouth bar appeared to occur in the longitudinal profile. The net sediment flux can be divided into three major components—advection sediment transport, tidal-pumping, and vertical circulation. Of these, seaward sediment advection was the dominant component, which generally conformed to the dynamic characteristics in a river-dominated estuary. Salinity intrusion into the bottom layer caused stratification, inhibited vertical diffusion, and enhanced sediment settling, resulting in an elevated SSC in the bottom layer at the mouth bar. Eulerian residual flow primarily contributed to the seaward advection transport. Tidal asymmetries during the ebb–flood tidal cycle enhanced tidal-pumping sediment transport, and the main driving factor, SSC asymmetry, corresponded well with sediment flux. The mouth bar exerted a significant morphological effect on salinity intrusion and promoted longitudinal estuarine circulation, thus affecting longitudinal sediment transport. Our results contribute to a better understanding of the underlying mechanism of suspended sediment transport in complex dynamic environments as well as the feedback between the hydrodynamic structure and morphology in estuaries, facilitating the development of evidence-based guidelines for estuarine and coastal engineering and management.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107575"},"PeriodicalIF":2.6,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906657","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":"Discovery of the world's largest cliff-top boulder: Initial insights and numerical simulation of its transport on a 30–40 m high cliff on Tongatapu (Tonga)","authors":"Martin Köhler ,&nbsp;Annie Lau ,&nbsp;Koki Nakata ,&nbsp;Kazuhisa Goto ,&nbsp;James Goff ,&nbsp;Daniel Köhler ,&nbsp;Mafoa Penisoni","doi":"10.1016/j.margeo.2025.107567","DOIUrl":"10.1016/j.margeo.2025.107567","url":null,"abstract":"<div><div>This study provides the first scientific investigation of the <em>Maka Lahi</em> boulder, a large limestone cliff-top boulder, measuring 14 × 12 × 6.7 m and weighing approximately 1180 t, located 200 m inland at 39 m elevation on the southern coast of Tongatapu, Tonga. The boulder is one of the largest known wave-transported boulders worldwide. Fieldwork conducted in 2024 revealed its presence, geomorphic setting, and karstification features. Utilizing numerical modelling, we established that wave heights of approximately 50 m and periods of 90 s were required to transport the boulder from its cliff-edge origin, suggesting that its emplacement likely resulted from a landslide-triggered tsunami event. U/Th dating of flowstone on the surface is indicative of a minimum age of 6891 cal yr BP and contributes critical evidence of a significant early Holocene tsunami event in Tonga. Notably, this represents the earliest known Holocene tsunami in the Pacific, offering new insights into the long-term history of extreme wave events in the region. This research strengthens the understanding of megaclast transport mechanisms and their implications for coastal hazard assessments in tsunami-prone regions.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"487 ","pages":"Article 107567"},"PeriodicalIF":2.6,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942626","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":"A coral microatoll record of sea-level rise, interseismic deformation, and El Niño in La Union, Philippines since 1906 CE","authors":"Gina M. Sarkawi ,&nbsp;Aron J. Meltzner ,&nbsp;Dongju Peng ,&nbsp;Joanne T.Y. Lim ,&nbsp;Xinnan Li ,&nbsp;Rohan Gautam ,&nbsp;Anandh Gopal ,&nbsp;Andrew Mitchell ,&nbsp;Loraine Faye Sarmiento ,&nbsp;Jennifer Weil-Accardo ,&nbsp;Kathrine V. Maxwell ,&nbsp;Junki Komori ,&nbsp;Noelynna T. Ramos","doi":"10.1016/j.margeo.2025.107565","DOIUrl":"10.1016/j.margeo.2025.107565","url":null,"abstract":"<div><div>Relative sea level (RSL) along western Luzon is influenced by climate change, tectonic deformation, and the El Niño–Southern Oscillation. Long, high-resolution records of past changes in sea level and land level are crucial to distinguish these contributions for forecasting future RSL or identifying tectonic hazards. Coral microatolls are invaluable proxies for reconstructing RSL, but their interpretation relies on understanding how short- and long-term changes are recorded in the coral skeleton. We analyzed growth bands from 1906 to 2018 CE of a <em>Porites</em> microatoll from Balaoan, La Union, Philippines, using X-rays of vertical cross sections. The microatoll's surface morphology, annual banding, and growth history reveal RSL rise during its lifetime punctuated by 17 diedowns. Coral diedowns generally coincide with low water near the site, often resulting from El Niño events. Excluding eroded sections, 10 of the 11 strongest El Niños since 1918 produced a diedown. Similarly, excluding a diedown caused by the coral tilting, 10 of the 12 preserved diedowns exceeding 3 mm in amplitude occurred during strong El Niños. Between 1948 and 2018 CE, RSL rose at 1.3 ± 1.8 mm/yr (2σ). Comparing sea-level rates from satellite altimetry and RSL from the coral, we estimate vertical land motion at −0.1 ± 12.1 mm/yr between 1995 and 2018 CE. The indicative meaning at Balaoan, defined as the relationship between local water levels and the highest level of growth of a coral microatoll before its most recent diedown, is estimated at 31.5 ± 10.0 cm (2σ) above lowest astronomical tide.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107565"},"PeriodicalIF":2.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927514","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":"Sediment source - sink processes in a typical tidal inlet bay system under intense human activities, Dingzi Bay, China","authors":"Yang Wang ,&nbsp;Rijun Hu ,&nbsp;Xiaodong Zhang ,&nbsp;Jiandong Qiu ,&nbsp;Naishuang Bi ,&nbsp;Longhai Zhu ,&nbsp;Yongchen Xu ,&nbsp;Jingrui Li ,&nbsp;Zhaohan Yi","doi":"10.1016/j.margeo.2025.107564","DOIUrl":"10.1016/j.margeo.2025.107564","url":null,"abstract":"<div><div>Tidal inlet bays are regions of intense material and energy exchange between the land and the sea. In this study, based on surface sediment grain size, geochemistry, bathymetric topography, and 1354 satellite images from 1984 to 2022, we used numerical modeling, bathymetric comparison methods to examine the sediment transport, sediment provenance, and relative contributions in the Dingzi Bay area. It summarizes the source-sink patterns under intense human activities. Dingzi Bay is predominantly erosive, with differences in the erosion and deposition of tidal flats on both sides of the bay, characterized by erosion on the north tidal flat and deposition on the south tidal flat. The main sources of bay sediments are river sediment transport and erosion from the north coast. The south tidal flat inside the bay and the south beach outside the bay are the few sink areas in the bay. The sediment transport path in the study area is from river sediments transported into the bay, with some bay sediments being moved out of the bay with the ebb current. Eroded sediments from the north beach are transported along the coast to the bay mouth, and some sediments are moved into the bay with the flood current. Intense human activities in the river basin leading to a reduction in terrestrial sediment supply are the main cause of bay erosion, and the ebb current-dominated tidal current further exacerbates the erosion of the bay.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107564"},"PeriodicalIF":2.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869009","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 geomorphic evolution of the Tasmantid Seamount Chain","authors":"Alysha M. Johnson ,&nbsp;Mark E. Dickson ,&nbsp;Sarah Hamylton ,&nbsp;Colin D. Woodroffe","doi":"10.1016/j.margeo.2025.107560","DOIUrl":"10.1016/j.margeo.2025.107560","url":null,"abstract":"<div><div>Oceanic volcanoes develop distinct post-eruptive morphologies depending on the geomorphic conditions they experience. Submerged, truncated, flat-topped volcanoes, known as guyots, result from marine erosion and subsidence, whereas on reefs or carbonate-capped volcanoes, carbonate accretion veneers the summit. New and existing bathymetric data are utilised to identify different geomorphic forms of oceanic volcanoes in the Tasmantid Seamount Chain, a hotspot chain off the east coast of Australia, dated from ∼6 Ma in the south to &gt;50 Ma in the north. Profiles and slope calculations across long and short axes provide morphometric values on the basis of which four morphologic forms are identified: seamount, guyot, modern reef, and carbonate-capped guyot. Volcanoes which erupted on oceanic lithosphere are estimated to have subsided at an average rate of 46.5 mMyr⁻¹, faster than the subsidence rate of volcanoes that erupted on continental lithosphere (33.0 mMyr⁻¹). The guyots are estimated to have eroded at an average rate of 1.9 ± 0.5 kmMyr⁻¹. Substantial carbonate accretion has formed on the summits of eleven volcanoes, ranging in thickness from 1146 m in the north to 93 m in the south. The geomorphic evolution of the Tasmantid Seamount Chain, since the Oligocene, is synthesised into a conceptual model. This study finds that the post-eruptive morphology of each volcano in the chain is a product of the combined influence of the northward movement of the Australian Plate, erosion, subsidence, and carbonate accretion.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107560"},"PeriodicalIF":2.6,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859018","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":"Suspended sediment pattern along the Mekong Delta's west coast induced by strong southwest monsoon activities and extreme events","authors":"Nguyen Nguyet-Minh ,&nbsp;Tu Duy Le ,&nbsp;Hiep Van Pham ,&nbsp;Hoang Thai Duong Vu ,&nbsp;Sylvain Ouillon ,&nbsp;Thanh Cong Nguyen","doi":"10.1016/j.margeo.2025.107563","DOIUrl":"10.1016/j.margeo.2025.107563","url":null,"abstract":"<div><div>Coastal suspended sediment dynamics and distributions are driven by complex forces and factors mainly related to wind-wave, currents and tide actions which resuspend unconsolidated sediment in the water-seabed layer and/or rework sediment in the seabed. Understanding the suspended sediment dynamics and their time- and space distribution are prominent issues for better understanding sediment transport processes, and morphological changes. Reliable estimated values of suspended sediment concentration (SSC) are key values for reliable modeling of coastal sediment transport. This study aims to investigate the spatial-temporal distribution of SSC along the west coast of the Vietnamese Mekong Delta forced by tides, currents and wind-wave factors which were generated during a strong activity of the southwest monsoon and extreme conditions caused by a tropical depression/storm circulation and thunderstorms. Our results showed that coastal currents and wind-wave actions mainly drove the SSC distributions. During the 12-day field survey, a high-turbidity front existed parallel and close to the coast at an average distance of 5 km where water depths range from 2 to 5 m. This front was likely related to the longshore drift current system which was partly captured by field survey data. The mean SSC value over an area of 400 km² was 80 mg/l, much larger than the values reported in numerical simulations or measurements elsewhere along the subaqueous Mekong Delta. This led to a requirement for reassessment and reanalysis of coastal sediment dynamics based on numerical models and this dataset will serve as an important benchmark for improving the performance of numerical models.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107563"},"PeriodicalIF":2.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847326","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}