Marine Geology最新文献

{"title":"High-precision estimation of a paleo-tsunami inundation area by identifying tsunami traces beyond sandy tsunami deposits: A case study of the 869 CE Jogan tsunami in Fukushima, northeastern Japan","authors":"Kaito Komeiji ,&nbsp;Tetsuya Shinozaki ,&nbsp;Daisuke Sugawara ,&nbsp;Takashi Ishizawa ,&nbsp;Minoru Ikehara ,&nbsp;Shigehiro Fujino","doi":"10.1016/j.margeo.2025.107490","DOIUrl":"10.1016/j.margeo.2025.107490","url":null,"abstract":"<div><div>Previous tsunami deposit studies have considered the distribution of visible sandy tsunami deposits as a tool to establish inundation areas and limits, but use of this area for tsunami magnitude estimation may cause it to be underestimated because the actual inundation limit of a tsunami rarely coincide with the depositional limit of visible sandy tsunami deposits. In this study, we aimed to reconstruct with high accuracy the inundation area of the Jogan tsunami, which occurred off the Pacific coast of the Tohoku region of Japan in 869 CE, by using sedimentological and geochemical methods to identify tsunami traces inland from the depositional limit of the tsunami deposits that are difficult to see by eye. We collected sediment samples at Minamisoma City, Fukushima Prefecture. Based on radiocarbon dating, grain-size analysis of sand, increased amounts of marine-derived elements such as Ca and Sr, and the presence of characteristic biomarkers, visible traces of sandy Jogan tsunami deposits were recognized up to 2280 m from the present coastline. Although no visible sandy tsunami deposits were observed farther inland, at 2790 m from the present coastline, evidence of seawater inundation was inferred from computed tomography image analysis, grain-size distribution of sand, presence of pumice, detection of squalene, and other allochthonous biomarkers. Detection of tsunami traces enables a highly accurate estimation of tsunami inundation areas, leading to a more accurate estimation of the source and scale of earthquakes.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107490"},"PeriodicalIF":2.6,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sediment bypassing around a headland in a high-energy coastal environment","authors":"Charlotte F.K. Uphues ,&nbsp;Graziela Miot da Silva ,&nbsp;Arnold van Rooijen ,&nbsp;Patrick A. Hesp","doi":"10.1016/j.margeo.2025.107491","DOIUrl":"10.1016/j.margeo.2025.107491","url":null,"abstract":"<div><div>Accurately estimating sediment transport rates is essential for predicting shoreline changes and guiding coastal management strategies. While existing longshore transport models primarily assume alongshore uniform sandy shorelines, the reality is usually more complex. Many coastal environments exhibit natural features and engineered structures that challenge these models by altering sediment transport and morphodynamic processes. This study presents observations from an extensive field campaign at the Cape Dombey headland in Robe, South Australia, incorporating a co-located acoustic current meter and sediment profiler to examine sediment bypassing during summer and winter. Offshore and nearshore wave characteristics and water levels were measured, with nearshore wave heights ranging from <span><math><mo>∼</mo></math></span>0.5 m in summer to &gt;2.5 m during winter storms. Statistical analysis revealed wave refraction, diffraction, and breaking over a submerged headland extension as the main drivers for wave transformation around the headland. Three distinct hydrodynamic regimes were identified, characterized by specific current directions and sediment transport rates around the headland. A novel conceptual model for headland bypassing is proposed, describing these regimes and identifying sediment transport patterns over event time scales. Sediment transport rates under swell-dominant (Regime 2) and sea-dominant (Regime 3) conditions were up to 30 and 40 times higher than during calm conditions (Regime 1). Our conceptual model builds upon existing models by providing a detailed description of headland bypassing mechanisms under various hydrodynamic forcing conditions. This study advances understanding of sediment transport around headlands in high-energy environments and provides an adaptable framework for measuring and analyzing headland bypassing in other coastal settings.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107491"},"PeriodicalIF":2.6,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling gas, hydrates, and slope stability on the U.S. Atlantic margin during Pleistocene glacial cycles","authors":"Olin R. Carty ,&nbsp;Warren T. Wood ,&nbsp;Benjamin J. Phrampus ,&nbsp;Taylor R. Lee ,&nbsp;Jennifer M. Frederick ,&nbsp;Michael Nole ,&nbsp;David Fukuyama ,&nbsp;Hugh Daigle","doi":"10.1016/j.margeo.2025.107492","DOIUrl":"10.1016/j.margeo.2025.107492","url":null,"abstract":"<div><div>Changes in temperature and sea level can cause dissociation of methane hydrates in shallow marine sediments, leading to seafloor destabilization. Along the U.S. Atlantic margin, there exists a well-documented history of slope failure and numerous recorded occurrences of gas seeps. Several studies have linked slope failure in the region to gas seepage and hydrate dissociation driven by glacial-interglacial transitions, but this linkage has not been quantitatively demonstrated. Along the shelf edge, in an area where shallow methane gas seeps have been identified, we modeled methane gas and hydrate formation using ensembles of one-dimensional fluid flow simulations. Methane gas formation was modeled over the last 120,000 years to simulate a glacial-interglacial cycle. We ran this model at 16,044 individual locations in the region between <span><math><msup><mn>29</mn><mo>∘</mo></msup></math></span> N – <span><math><msup><mn>45</mn><mo>∘</mo></msup></math></span> N and <span><math><msup><mn>82</mn><mo>∘</mo></msup></math></span> W – <span><math><msup><mn>66</mn><mo>∘</mo></msup></math></span> W at a resolution of 1 × 1 arcminutes, focusing specifically on water depths between 200 and 1000 m that bracket the seafloor outcrop of the base of the hydrate stability zone. Using historic temperature and pressure records from the last 120,000 years, sediment properties in the area, and factor of safety calculations, we found that hydrate dissociation alone is unlikely to cause slope failure in the region, implying that an additional driving force would be necessary for failure to occur.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107492"},"PeriodicalIF":2.6,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372414","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":"Corrigendum to “Mid-Holocene hydroclimatic change and hurricane activity in Central America recorded by an Isla de Mona Stalagmite” [Marine Geology 471 (2024) 107289]","authors":"Huiru Tang ,&nbsp;Liangcheng Tan ,&nbsp;Yongli Gao ,&nbsp;Jingjie Zang ,&nbsp;Le Ma ,&nbsp;Yanzhen Li ,&nbsp;R. Lawrence Edwards ,&nbsp;Hai Cheng ,&nbsp;Ashish Sinha ,&nbsp;Xiqian Wang ,&nbsp;Xing Cheng ,&nbsp;Ángel A. Garcia Jr ,&nbsp;E. Calvin Alexander Jr","doi":"10.1016/j.margeo.2025.107481","DOIUrl":"10.1016/j.margeo.2025.107481","url":null,"abstract":"","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107481"},"PeriodicalIF":2.6,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430016","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":"Major Holocene glacio-isostatically-induced earthquakes triggered mass-transport deposits and seabed displacements in Lake Melville","authors":"Jaia Syvitski ,&nbsp;Alexandre Normandeau ,&nbsp;Patrick Lajeunesse","doi":"10.1016/j.margeo.2025.107482","DOIUrl":"10.1016/j.margeo.2025.107482","url":null,"abstract":"<div><div>The character and history of post-depositional structures within Lake Melville, Labrador, Canada, is investigated from a geohazard and sedimentary process perspective. Large Holocene earthquakes during glacio-isostatic recovery generated large (up to 3.1 km³) contemporaneous failures across up to 7 separated basins, and earthquake-related markers including vents, pockmarks, diapirs, stratigraphic offsets, and massive liquefaction fronts. Epicenter locations within Lake Melville are identified for three ∼7 ± M_L magnitude Holocene earthquakes. Deposits include a massive 3.1 km³ turbidite MT event at ∼7 ± 0.3 kyr BP, the up to 1.1 km³ mega debris flow DF1 event at ∼6 ± 0.2 kyr BP, and the equally large 1750 ± 50 CE DF2 event. Mega-debris flow theory is revised to include seafloor liquefaction beneath the path of the mass flow, debris-flow bulking by incorporating underlying sediments, and shock-front compression for failures with large drop heights. During the DF1 event, 68 km² of the seafloor collapsed forming fault-strike mega-pockmarks or vents, with 40 % contemporaneously buried by mega debris flows. The collapse volume is associated with ∼5000 large sand or mud diapirs (∼0.2 Gt) at a spatial density of 5 ± per km² across well-separated basins. The DF2 event created a 0.11 km³ prodelta channel that since 1750 CE serves largely as a bypass zone for a growing 0.01 km³ sandy turbidite fan. Lake Melville's tendency towards thixotropic sediment failure reflects high basin-filling accumulation rates (3+ cm per yr) and the presence of buried and over-pressured low-cohesion sandy-silt layers. Mega debris flows in Lake Melville remobilized and entrained substrate during transport, more than doubling their original failure volume. Tsunami wave amplitude predictions may be over-estimated by up to 75 %, if incorrectly based on deposit volume rather than the originating slope failure. Maximum tsunamis amplitude estimates for Lake Melville fall between ∼23 m and ∼ 69 m.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107482"},"PeriodicalIF":2.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177757","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":"Chicxulub impact tsunami megaripples, imaged in 3D seismic data: Distribution and characteristics on the northern Gulf of Mexico shelf and slope","authors":"Gary L. Kinsland ,&nbsp;Rui Zhang ,&nbsp;Rika Burr ,&nbsp;Stephen Klug","doi":"10.1016/j.margeo.2024.107466","DOIUrl":"10.1016/j.margeo.2024.107466","url":null,"abstract":"<div><div>Kinsland et al. (2021) presented images of megaripples derived from 200 sq. km (77 sq. mi) of petroleum industry 3D seismic data from the paleoshelf of central Louisiana, United States of America. The megaripples are interpreted to be the result of the Chicxulub Impact about 66 million years ago, the Cretaceous/Paleogene boundary. To investigate the presence and morphology of megaripples both farther up the paleoshelf and down over the paleoshelf edge onto the paleoslope we have obtained access to and have interpreted over 2400 sq. km (900 sq. mi) of additional 3D seismic data. Megaripples exist everywhere in the data investigated upon/within the, once, fluidized marl muds of a mass transport deposit which was mobilized by Rayleigh waves from the Chicxulub Impact, about an hour before the tsunami reached the northern Gulf of Mexico (Louisiana). We propose that the megaripples were formed in these thixotropic muds by fluid traction of the tsunami in much the same way that water waves are formed by the traction of wind and the forms persisted in the muds as the tsunami waned. We outline how studies similar to ours might lead to better understanding of tsunami effects and dangers in general and in those from tsunami resulting from oceanic impacts.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107466"},"PeriodicalIF":2.6,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177758","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":"Study on the morphodynamic response of reef flat with moveable bed to monochromatic waves","authors":"Yu Yao ,&nbsp;Zhangyan Li ,&nbsp;Zhongwei Zhao ,&nbsp;Long Chen ,&nbsp;Baobao Zhou ,&nbsp;Xiuqi Han","doi":"10.1016/j.margeo.2025.107479","DOIUrl":"10.1016/j.margeo.2025.107479","url":null,"abstract":"<div><div>While carbonate sediment transport processes over coral reefs have been extensively investigated in the past decade，very few studies have focused on the morphodynamic response of sandy reef flats to wave action. In this study, a set of innovative wave-flume laboratory experiments was conducted for the first time to investigate the evolution of reef flat based on a barrier reef profile. Various monochromatic wave conditions (incident wave height, incident wave period and initial reef-flat water level) and sediment layer thicknesses were tested. A sand layer was paved on the reef flat to simulate a moveable bed and the reef surface roughness was replicated using an array of cylinders. Subsequently, a phase-resolving non-hydrostatic model (XBeach-NH) was adopted to simulate both the hydrodynamic and morphodynamic processes in the reef environment. A vegetation module was incorporated into Xbeach-NH to represent the rough reef surface. The adopted model was validated against the laboratory dataset for the first time as reported in this study. It was then used to examine the impacts of varying fore-reef slopes, sediment grain sizes and reef surface roughness on the morphodynamic response of sandy reef flats to monochromatic wave action. Model outputs suggested that projected sea-level rise, reduced reef surface roughness and increased storminess due to climate change have profound impacts on the morphodynamic processes on the reef flat thus may eventually contribute the geomorphological sustainability of reef islands.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107479"},"PeriodicalIF":2.6,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177305","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":"Rapid, complex back barrier pedestal formation preconditions washover deposition on the southeast Indian coast","authors":"Chris Gouramanis ,&nbsp;Seshachalam Srinivasalu ,&nbsp;Andasabari Karthik ,&nbsp;Dat T. Pham ,&nbsp;Stephen Carson ,&nbsp;Adam D. Switzer","doi":"10.1016/j.margeo.2025.107477","DOIUrl":"10.1016/j.margeo.2025.107477","url":null,"abstract":"<div><div>Washover deposits formed by overwash are important deposits for evaluating the stratigraphy and evolution of coastal environments. Examination of preserved washover fans can provide a palaeotempestological record that inform past and recent coastal risk with a view to predicting future coastal risk. The recognition of past washover deposits in coastal systems requires detailed knowledge of the internal structure of recent deposits including washover fans. We used very high frequency Ground Penetrating Radar and satellite imagery to examine the internal architecture of the 31st December 2011 Cyclone Thane surge-generated washover deposit on the beach that blocked the Thenpennai River at Thazhamkuda, near Cuddalore in Tamil Nadu Province, southeastern India. Cyclone Thane overwash overtopped the beach and deposited sediments on the contemporary beach and behind the beach within the former channel of the blocked river. The modern washover fan thus contains sediments that are preserved subaqueously and subaerially. We demonstrate that the internal architecture of the fan at Thazhamkuda is largely controlled by the pre-existing topography, and erosional and depositional processes as the cyclone washed sediment inland. At the landward margin of the fan, terminal foreset bedding is preserved and is likely to be one of the only features that can discriminate storm over tsunami deposits.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107477"},"PeriodicalIF":2.6,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surfzone-beach-dune interactions on the Chinese coasts","authors":"Wei Tian ,&nbsp;Yuxiang Dong ,&nbsp;Shuyi Fu ,&nbsp;Shaoyun Zhang ,&nbsp;Dequan Huang ,&nbsp;Lin Yang","doi":"10.1016/j.margeo.2025.107480","DOIUrl":"10.1016/j.margeo.2025.107480","url":null,"abstract":"<div><div>Wave-beach-dune interactions are essential in investigating coastal aeolian landforms and have attracted decades of research effort. As the conceptual models were proposed and improved, case studies have been explored in-depth, indicating that beach and dune interactions exhibit significant spatial heterogeneity across tidal and wave environments. In this study, sixty-five coastal dune systems along China's coasts are investigated to explore the variability of surfzone-beach-dune interactions along the Chinese coasts and the underpinning mechanisms. A dataset comprising wave height, tidal range, Drift Potential, and beach-dune morphology is established based on interpretations of historical topographical and bathymetric maps, field survey investigations, and monitoring data for waves, tides, and winds. Classifications of surfzone/beach morphodynamics and dune morphology relationships at macro-, meso-, and micro-tide levels are presented, with mechanisms clarified through linear regression analysis between dune height and various environmental variables. Our results show that modal surfzone-beach states in the studied sites are correlated with dune sizes. Spring tidal range influences surfzone-beach state by providing a potentially greater storage space for aeolian sediment transport as tidal range increases. Wave energy acts as a clear driver of onshore sediment transport, with higher wave energy and more dissipative surfzone states correlated with greater sediment supply. Additionally, shoreline orientation and exposure to onshore winds control the occurrences of foredunes. The outcomes of this work provide an overview on the relationships between surfzone/beach and dune systems across the different tidal regimes along Chinese coast. Our dataset and results will provide a scientific basis for evaluating the vulnerability of dune system to hazards impacting the coasts.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107480"},"PeriodicalIF":2.6,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177306","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":"Development shifts on the emerging Järve coast (Estonia) in Late Holocene","authors":"Katre Luik ,&nbsp;Hannes Tõnisson ,&nbsp;Reimo Rivis ,&nbsp;Kadri Vilumaa ,&nbsp;Tiit Vaasma ,&nbsp;Egert Vandel ,&nbsp;Toru Tamura ,&nbsp;Ülo Suursaar","doi":"10.1016/j.margeo.2025.107478","DOIUrl":"10.1016/j.margeo.2025.107478","url":null,"abstract":"<div><div>This study identifies a sequence of accretional paleospits and beach ridges at the Järve coast, which developed over the past 4000 years (4 ka) mostly through coastal progradation and land emergence driven by glacial isostatic adjustment (GIA). Using optically stimulated luminescence dating, LiDAR elevation data, historical cartography, and recent instrumental metocean forcing data, we analyze the historical developments in relative sea level (RSL) and major shifts in the region's geomorphology from the Mid- to Late-Holocene. From 7.3 to 4 ka, the GIA induced uplift with local rate of about 2.2 mm/a facilitated land emergence and the formation of the Järve shoal which was exposed to storms from west, south and east; from 4 to 3 ka, the shoal evolved into a sandy island with spits; between 3 and 1.5 ka, the barrier island became connected with the Saaremaa mainland while the still emerging paleospits distanced from the sea. From 1.5 ka to 1850 CE, westerly forces were cut off; cooling climate during the Little Ice Age and tree logging facilitated formation of nearshore dune belt. In the mid-20th century, a reversal in RSL occurred, as the global sea level rise exceeded the local uplift. Concurrently to the Baltic Sea winter ice extent decrease, Järve ice days have reduced by 46 % from 1750 to 2023 CE. This reduction has exposed the coast to increased wave energy and storm surges from winter storms, resulting in an approximate 85-m shoreline recession at Järve and sediment accumulation near downdrift Nasva port.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107478"},"PeriodicalIF":2.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}