Jeffrey Munar, Anne Drew Carrillo, Laura David, Fernando Siringan
{"title":"Shoreline movements around small reef islands of the Kalayaan Island Group, West Philippine Sea","authors":"Jeffrey Munar, Anne Drew Carrillo, Laura David, Fernando Siringan","doi":"10.1016/j.ecss.2025.109343","DOIUrl":"10.1016/j.ecss.2025.109343","url":null,"abstract":"<div><div>Reef islands have highly dynamic beaches, with shorelines that shift easily due to changes in wave patterns influenced by wind conditions, typhoons, and sea-level. Habitat conditions within and around reef island systems also impact shoreline integrity. Mapping shoreline movement patterns is essential for understanding their evolution and potential responses to climate and human-induced changes.</div><div>Shoreline positions for several islands in the Kalayaan Islands, West Philippine Sea—including Pag-asa, Parola, Kota, Likas, and Lawak—were traced from satellite images obtained via Google Earth, covering the period from 2005 to 2023. These are complemented by field-derived shoreline positions acquired during 2022. Statistics were calculated using the Digital Shoreline Analysis System (DSAS). Patterns and rates of shoreline change vary among the reef islands. Net accretion has taken place in Parola Island while the rest of the islands have net erosion. Erosion rates are generally high on the eastern sections of the islands, while the southwest sections experience the highest accretion rates. Islands positioned more east of their atolls show greater erosion. The overall shoreline patterns are attributed to the reduced southwest (SW) monsoon and relatively constant northeast (NE) monsoon intensities during the period covered by this study. Consequently, the southwest sediment drift driven by the NE winds dominated over the northeastward sediment drift driven by the SW winds.</div><div>Shorelines also respond to sudden natural and anthropogenic stressors. Episodes of high wave energy conditions, Typhoon Hagupit in 2014 and frequent typhoons in 2017, caused substantial losses in island area. Vegetation Index Green (VI<sub>green</sub>) was also computed to assess the extent of vegetation coverage. Losses in vegetation cover also correlate with losses in the island area. A disturbance that likely tempered erosion, temporarily, is the elevation of sediment input to the coast caused by extensive dredging on the reef flat between 2013 and 2014. Dredging exposed and released sediment to the reef. However, this activity reduced the living coral cover and effectively increased the water depth on the reef flat. Consequently, this will decrease the reef's ability to sustain sediment supply to the island in the long term. These various natural and anthropogenic impacts are vital in managing limited sediment resources in light of rising sea levels on small reef island systems.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109343"},"PeriodicalIF":2.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936876","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}
Alan K. Whitfield , Trevor D. Harrison , James R. Tweedley
{"title":"Comparisons between estuary-associated ichthyofaunas in ecoregions around the Indian Ocean","authors":"Alan K. Whitfield , Trevor D. Harrison , James R. Tweedley","doi":"10.1016/j.ecss.2025.109335","DOIUrl":"10.1016/j.ecss.2025.109335","url":null,"abstract":"<div><div>This review examines possible fish colonisation processes that started in the Early Jurassic and gained momentum during the Cretaceous when plate tectonics and continental drift created the Indian Ocean between Africa, Madagascar, Asia and Australia. Initial colonisation of the newly created estuaries by fish is likely to have occurred during the Devonian in eastern Gondwana when these land masses were confined to the temperate waters of the southern hemisphere. A major marine extinction event 372 Ma would probably have eliminated many of these taxa from those estuaries. Tropical marine fish families from the Tethys Sea region would then have used the epicontinental seaways between Africa, Madagascar, India and Australia to colonise the estuaries on these drifting land masses. Speciation by some of these tropical taxa would then have occurred such that the southern temperate waters became occupied by a less species rich cool-water ichthyofauna. A Bray-Curtis similarity matrix was created using the presence/absence of fish families and species from selected ecoregions around the Indian Ocean rim. These analyses showed that fish families present in estuaries on the eastern and western side of the Indian Ocean were over 74 % similar but that the species present were only 40 % similar. In terms of past and present geodispersal of fish taxa, the northern route through tropical coastal waters was always viable but long distance movements through the large central or southern parts of the Indian Ocean basin was not. In addition, dispersal of fish species across arid coastal ecoregions where estuaries are scarce appears to have limited the continuity of ichthyofaunal colonisation processes around the ocean rim.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109335"},"PeriodicalIF":2.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943708","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}
Shu-Yen Huang , Wei-Jen Lin , Li-Hua Lee , Hsing-Juh Lin
{"title":"Community metabolism and greenhouse gas emissions in abandoned tropical salt pans","authors":"Shu-Yen Huang , Wei-Jen Lin , Li-Hua Lee , Hsing-Juh Lin","doi":"10.1016/j.ecss.2025.109327","DOIUrl":"10.1016/j.ecss.2025.109327","url":null,"abstract":"<div><div>A large area of coastal wetlands has been converted into solar salt pans over thousands of years. However, salt production declined significantly from the 20th century onward, leading to the abandonment of many salt pans globally. Coastal wetlands are generally recognized as blue carbon ecosystems, but little is known about the carbon flux of abandoned salt pans. This study aimed to assess the carbon flux of abandoned tropical salt pans, using a case study in Budai, southwestern Taiwan by measuring community metabolism and greenhouse gas (GHG) emissions. The results of community metabolism showed that the pelagic community of the salt pans is autotrophic, which is closely related to water chlorophyll <em>a</em> concentration. However, the benthic community is heterotrophic, which is influenced by water temperature and dissolved inorganic phosphorus concentration. The combined metabolism of pelagic and benthic communities in the salt pans exhibited an average carbon absorption of 111.5 g C m<sup>−2</sup> yr<sup>−1</sup>. The results of GHG emissions measured with floating chambers indicated that the CO<sub>2</sub> flux into the salt pans averaged 139.3 g CO<sub>2</sub> m<sup>−2</sup> yr<sup>−1</sup>, but a small amount of averaging 354.8 mg CH<sub>4</sub> m<sup>−2</sup> yr<sup>−1</sup> and 136.0 mg N<sub>2</sub>O m<sup>−2</sup> yr<sup>−1</sup> was emitted from the salt pans. Consequently, the net GHG balance indicated that the salt pans serve as systems for removing GHG at an average rate of 92.6 g CO<sub>2</sub>e m<sup>−2</sup> yr<sup>−1</sup>. The CO<sub>2</sub> removal capacity of abandoned tropical salt pans performed better than that of unvegetated coastal wetlands, showing the potential to mitigate climate change.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109327"},"PeriodicalIF":2.6,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924233","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":"Constancy and change in macrobenthic abundance, biodiversity and assemblage structure along the axis of a flood-tidal sand delta","authors":"R.S.K. Barnes","doi":"10.1016/j.ecss.2025.109326","DOIUrl":"10.1016/j.ecss.2025.109326","url":null,"abstract":"<div><div>Flood-tidal deltas commonly occur along microtidal coasts in the mouths of those inlets kept open by tidal currents, but they have seldom been studied ecologically. Such a delta of fine sand occurs in the Knysna estuarine bay, South Africa, extending for some 2 km upstream. Although macrofaunal assemblage metrics (overall abundance, observed and estimated species density, geometric mean morphospecies abundance, evenness, and patchiness) varied little along the deltaic axis, faunal composition changed markedly though without species replacement except in the paraonid polychaetes. Unusually, the sand was dominated by these paraonids (especially <em>Paradoneis lyra capensis</em>) and, over its proximal half, also by the amphipod <em>Urothoe pulchella</em>, but worms steadily increased in importance upstream whilst crustaceans decreased. Noteworthily, a psammodrilid was present - the first record from Africa. The flood-tidal shore fauna contrasted in composition with that of the facing ebb-channel shore (dominated by <em>Dipolydora</em>) and areas upstream of the mouth.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109326"},"PeriodicalIF":2.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902401","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}
Sophie Kache , Iris Liskow , Johannes Pein , Mindaugas Žilius , Maren Voss
{"title":"The role of retention processes in the coastal filter of the Oder River","authors":"Sophie Kache , Iris Liskow , Johannes Pein , Mindaugas Žilius , Maren Voss","doi":"10.1016/j.ecss.2025.109325","DOIUrl":"10.1016/j.ecss.2025.109325","url":null,"abstract":"<div><div>Riverine nutrient export significantly impacts coastal and shelf seas, causing eutrophication. However, nutrient export can be mitigated by the coastal filter function, potentially resulting in permanent removal of nutrients through denitrification. Besides removal, nutrients can also be retained in the coastal zone through assimilation, remineralisation or nitrification, with repeated recycling prolonging their availability to organisms. While removal processes have been extensively studied, their effect on the riverine dissolved inorganic nitrogen (DIN) loads reaching the coast may be small. There are only a few accurate estimates that include all processes of the coastal filter. In this study, nutrient concentrations and net autotrophic uptake rates in the water column, together with benthic NO<sub>3</sub><sup>−</sup> reduction rates and solute fluxes across the sediment-water interface, were measured. We compared a lagoon with the open coast within the outflow area of the Oder River, one of the largest inflows to the southern Baltic Sea, over a seasonal cycle. Particle drift experiments using hydrodynamic model simulations of the Oder estuary yielded water residence times (WRT) along the outflow. In the lagoon, DIN concentrations, primary production and DIN uptake rates were higher than at the coastal station. The data suggested efficient DIN retention, as the majority of riverine DIN was assimilated (85 %), with a preference for NH<sub>4</sub><sup>+</sup> over NO<sub>3</sub><sup>−</sup> uptake. High retention in the lagoon was supported by long WRT of up to 180 days. In the open coast, productivity was lower due to continuous dilution of riverine nutrients by transport processes. The sediment served as a periodic source of nutrients for water column processes. Our data suggest that intense recycling in the water column and strong benthic-pelagic coupling promote a tightly coupled nitrification-denitrification, resulting in vital N removal rates in the sediment. Nevertheless, strong predominance of N retention processes, and specifically assimilation over N removal processes, illustrates that the former is an important component of the coastal filter function, as it provides substrates for nutrient removal (organic matter and NO<sub>3</sub><sup>−</sup>). These results extend the assessment of the effectiveness of the coastal filter and should be taken into account in further studies.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"322 ","pages":"Article 109325"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107837","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":"Microplastics and other plastic-like microdebris in sediments from the Dart River and Estuary, southwest England","authors":"Maia Killian, Andrew Turner","doi":"10.1016/j.ecss.2025.109324","DOIUrl":"10.1016/j.ecss.2025.109324","url":null,"abstract":"<div><div>Surficial sediment samples (<em>n</em> = 10) collected from a transect of a river-estuary (Dart) in southwest England have been analysed for geochemical characteristics, anthropogenic metals (Cr, Cu, Sn, Pb, Zn), and microplastics (∼50 μm–5 mm) and other microplastic-like debris. Results indicated the finest grains towards the lower river and upper estuary, a seaward increase in sedimentary Ca, and loss on ignition ranging from about 0.7 to 4 %. Anthropogenic metals were heterogeneously distributed throughout the catchment with maximum concentrations in the river or lower estuary. Microplastics were dominated by fibres, with concentrations ranging from 110 to 1800 kg<sup>−1</sup> and composition either cellulosic (cotton or rayon) or thermoplastic (polyester or acrylic). Microfibre abundance exhibited no clear relationships with geochemical characteristics or anthropogenic metals but fibres were enriched downstream of a wastewater treatment plant and accumulation of larger fibres was greatest where sediments were finest. Other microdebris was observed in four samples and consisted of fragments (mainly paint flakes) and hollow glass beads. Paint flakes identified as antifouling formulations enriched in Cu, Zn and Sn and road markings containing solid glass beads. Maximum sediment Cu and Zn concentrations coincided with the location where the majority of paint flakes (>2000 kg<sup>−1</sup>) were encountered. While not all microscopic particles identified in the present study are plastic, they share similar properties and likely have common impacts. Accordingly, and more generally, we recommend that a broader array of both plastics and plastic-like particles, coupled with measures of sediment geochemistry and anthropogenic impact, are considered in environmental studies and impact assessments.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109324"},"PeriodicalIF":2.6,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904219","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}
Arame Dièye , Patrick Marchesiello , Bamol Ali Sow , Habib Boubacar Dieng , Duong Hai Thuan , Luc Descroix
{"title":"Tidal amplification and distortion in Guinea-Bissau, West Africa","authors":"Arame Dièye , Patrick Marchesiello , Bamol Ali Sow , Habib Boubacar Dieng , Duong Hai Thuan , Luc Descroix","doi":"10.1016/j.ecss.2025.109318","DOIUrl":"10.1016/j.ecss.2025.109318","url":null,"abstract":"<div><div>Understanding tidal behavior is of paramount importance in Guinea-Bissau, a vulnerable low-lying coastal zone with the highest tidal range of any West African country. Our aim is to improve tide prediction by analyzing its characteristics and mechanisms of amplification and distortion. To this end, we use a high-resolution coastal ocean model (CROCO) validated by tidal altimetry and new tide gauge data. We present and analyze the cotidal charts of the main constituents. The amplification occurs first in coastal waters due to resonance over the broad shelf and strengthens in the estuaries, especially in the Geba Channel where a tidal range of 7 m can be reached. This is due, in part, to the funneling of tidal energy, which travels from the south through the Bijagos Archipelago. There is also a resonance of a quarter wavelength (mode 0) for semi-diurnal tides. In smaller estuaries (e.g., Buba), there is no funneling, so the tides can only be amplified by resonance with reflected waves. A strong tidal asymmetry is also demonstrated due to the generation of overtides that are resonant with mode 1 at Geba and mode 0 at Buba. The asymmetry and Stokes drift associated with the progressive waves in the Geba Channel (leading to tidal setup) make it a complex local system with ebb dominance at the mouth, perhaps contributing to the continuous accretion in the Bijagos archipelago. Other smaller estuaries characterized by standing waves are more classically flood-dominated. All this affects the residence time of water along the coasts and estuaries of Guinea Bissau.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109318"},"PeriodicalIF":2.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887269","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}
Zeng Lei , Zheng Tingting , Zhou Ziyi , Liu Beibei , Li Wuhui , Chen Guobao
{"title":"Biodiversity and spatial heterogeneity of fish communities in response to geo-environmental disturbances","authors":"Zeng Lei , Zheng Tingting , Zhou Ziyi , Liu Beibei , Li Wuhui , Chen Guobao","doi":"10.1016/j.ecss.2025.109322","DOIUrl":"10.1016/j.ecss.2025.109322","url":null,"abstract":"<div><div>Coastal ecosystems are intricately connected to human life. However, increasing human activities have exerted significant pressure on coastal fish communities. Understanding the relationship between fish communities and geo-environmental disturbances is essential for the scientific development of fish conservation and environmental restoration strategies. Despite this importance, our understanding of this relationship remains limited. To address this gap, we established 40 sampling points along the coast of Guangdong in the autumn of 2020 to enhance our understanding of how geo-environmental disturbances have affected the spatial pattern of fish communities. The fish communities along the coast of Guangdong were broadly categorized into three distinct regions (A, B, and C), which were primarily affected by geo-environmental factors including longitude, latitude, depth, and environmental disturbances such as bottom trawling. Notably, biodiversity indicators such as Shannon, Delta+, and FDiv varied significantly in different regions. They were negatively correlated with both longitude and latitude, but positively correlated with water depth and environmental disturbances (W). Furthermore, FDiv served as a critical link between the spatial heterogeneity of fish communities and the geo-environmental disturbances. The spatial average variation degree (SAVD) was positively correlated with biodiversity, but exhibited an opposite pattern with fish community stability. Fish species that significantly contributing to the spatial heterogeneity and stability of fish communities should be prioritized for protection. The results of this study provided valuable insights for developing effective fish conservation strategies within the coastal ecosystem.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109322"},"PeriodicalIF":2.6,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887173","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}
Alexandre da Gama Fernandes Vieira-Júnior , Breno Silva Macário , Steven J. Presley , Michael R. Willig , André Luiz Machado Pessanha
{"title":"Influence of algal drift and morphodynamic conditions on the fish assemblages and feeding guilds in ocean-exposed tropical beaches","authors":"Alexandre da Gama Fernandes Vieira-Júnior , Breno Silva Macário , Steven J. Presley , Michael R. Willig , André Luiz Machado Pessanha","doi":"10.1016/j.ecss.2025.109321","DOIUrl":"10.1016/j.ecss.2025.109321","url":null,"abstract":"<div><div>The surf zones of sandy beaches are habitats in which morphodynamic characteristics (e.g., tide-modified versus wave-dominated beaches) influence the distribution of fish species. In addition, algal drift from adjacent coastal ecosystems (allochthonous material) is an important source of spatial heterogeneity within sandy beach habitats, providing refuge and food resources for fish species. We evaluated the influence of algal drift on the abundance, richness, and biomass of fish assemblages and feeding guilds (i.e. zooplanktivores, piscivores, opportunists and benthivores) on beaches with different exposures to wave conditions. For the entire fish fauna, abundance and species richness, but not biomass, differed between beach exposures. Similarly, abundance and biomass, but not richness of zooplanktivorous fish differed between tide-modified and wave-dominated beaches. In contrast, abundance, but not richness or biomass of benthivorous fish differed among categories of algal volume, while morphodynamic characteristics had no main or interactive effects. Finally, morphodynamic characteristics interacted with differences among categories of algal volume to affect species richness but not abundance or biomass of fish in the opportunist's guild. The size of individuals in the entire fish fauna and in the opportunists guild was affected by beach type and algae volume, whereas in the zooplanktivorous guild size was only affected by algal volume. The size of fish in the benthivorous guild was not affected by algal volume in tide-modified beaches. The responses of fish to morphodynamic conditions and algal drift were guild-specific, suggesting that different strategies may need to be implemented for the conservation or management of these trophic groups.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"320 ","pages":"Article 109321"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887174","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}
Luke J. Jenkins , Ivan D. Haigh , Dafni E. Sifnioti , Jose Alejandro Pinto Rascon , Addina Inayatillah , Hachem Kassem
{"title":"Non-linear tide-surge interactions around the coast of the UK through the lens of tidal level, phase, and skew surge","authors":"Luke J. Jenkins , Ivan D. Haigh , Dafni E. Sifnioti , Jose Alejandro Pinto Rascon , Addina Inayatillah , Hachem Kassem","doi":"10.1016/j.ecss.2025.109323","DOIUrl":"10.1016/j.ecss.2025.109323","url":null,"abstract":"<div><div>Coastal flooding, driven by extreme sea levels, is a significant threat to the coastline of the United Kingdom. The primary contribution to extreme sea levels is the combination of tide and surge and understanding how these components interact is critical to assessing extreme sea levels at the coast. Here, we analyse the interactions of skew surge and tidal high water, non-tidal residual and tidal phase, and non-tidal residual and tidal level using the entire observational tide gauge network of the UK, a near 500-year model, and a model run of 2013/14 with an artificially adjusted forcing to examine how storm arrival time impacts these interactions. We show that the levels of tide-surge interaction at most sites are relatively insensitive to the magnitude of the extreme value threshold and the declustering window size. Measured data show greater levels of interaction than modelled data and although there is little interaction between skew surge and tidal high water, there are sizeable tide-surge interactions between the non-tidal residual and the astronomical tide, the largest being for tidal phase. Around the UK, extreme non-tidal residuals generally occur favourably between 1 and 5 h before tidal high water and at tidal levels that are at, or below, the average tidal level. When storm arrival time is artificially shifted, the overall change in interaction around the UK is relatively small, with skew surge and non-tidal residual maxima occurring at similar respective tidal high waters, tidal phases, and tidal levels, although variation is seen on smaller spatial scales. Our findings advance the understanding of non-linear tide-surge interactions around the UK, which is essential for the accurate estimation of extreme sea level probabilities and thus the defence of the coastline against coastal flooding.</div></div>","PeriodicalId":50497,"journal":{"name":"Estuarine Coastal and Shelf Science","volume":"321 ","pages":"Article 109323"},"PeriodicalIF":2.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936875","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}