Continental Shelf Research最新文献

{"title":"Environmental controls on the interannual variability in chlorophyll and phytoplankton community structure within the seasonal sub surface chlorophyll maximum in the western English channel","authors":"Michelle L. Barnett,&nbsp;Alan E.S. Kemp,&nbsp;Anna E. Hickman,&nbsp;Duncan A. Purdie","doi":"10.1016/j.csr.2024.105253","DOIUrl":"10.1016/j.csr.2024.105253","url":null,"abstract":"<div><p>The subsurface chlorophyll maximum (SCM) is increasingly recognised as an important but understudied locus of primary production particularly in shelf seas. Here we report the results of a 4 year, repeat station, summer sampling programme (2013–2016) of a seasonally recurrent SCM in the Western English Channel. Interannual variability in phytoplankton community structure and chlorophyll distribution and intensity was strongly related to water column stability at the depth interval of the SCM and also to water temperature. The phytoplankton community was statistically distinct in each year. High stability, as evidenced by large Richardson numbers and a well-developed strong thermocline appeared to favour the growth of larger dinoflagellates (autotrophs or mixotrophs) and diatoms. Such conditions led to development of the most intense SCMs and these were sometimes dominated by a single or a few key species most prominently in 2015 with near monospecific concentrations of the dinoflagellate <em>Tripos fusus</em> with average peak SCM chlorophyll concentrations of 7.3 ± 4.4 μg l⁻¹. By contrast, in years with low water column stability and intermittent turbulence at the thermocline (2014, 2016) there was greater chlorophyll dispersal and less intense SCM. In these low stability conditions, red fluorescent nano-phytoplankton, such as naked dinoflagellates, chlorophytes and prymnesiophytes, made a greater contribution to the community, possibly as a result of the advantages that motility and enhanced light utilisation efficiency confer within an SCM exposed to turbulence. It is also likely that turbulence disrupted the stability required by the larger dinoflagellates and diatoms. Several of the key SCM taxa were absent from surface waters including the dinoflagellates <em>Tripos fusus</em>, <em>Tripos lineatus</em>, and most of the <em>Rhizosolenia</em>/<em>Proboscia</em> diatoms, consistent with adaptations more suited to survival at depth in stratified waters. These traits include luxury nutrient uptake and storage and survival in low light (both groups) and mixotrophy (dinoflagellates). On the other hand, in 2013, diatoms including <em>Pseudo-nitzschia</em> spp. were abundant in both surface, SCM and bottom waters. The relatively cooler waters (11.6–12.1 °C on average in 2013 and 2016) were characterised by smaller diatoms (<em>Chaetoceros</em> spp. and <em>Pseudo-nitzschia spp.</em>) whereas the warmer waters (13.1 °C on average in 2014) contained larger diatoms (large <em>Rhizosolenia</em> spp., <em>Lauderia annulata</em> and <em>Leptocylindrus danicus</em>). There did not appear to be continuity of key species between years, other than for the dinoflagellate <em>Tripos lineatus</em>, which was significant in both 2013 and 2014 and present in 2015. In any given year, there was no correspondence between the key spring bloom phytoplankton species as monitored in the nearby Western Channel Observatory L4 station and the key SCM taxa","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324000839/pdfft?md5=f725108532b0c6cde9ee4ae8a9ca642b&pid=1-s2.0-S0278434324000839-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141055814","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":"Storm-tide and wave interaction at Puerto Rico during Hurricanes Irma and Maria","authors":"Qiang Chen ,&nbsp;Yuepeng Li ,&nbsp;David M. Kelly ,&nbsp;Ping Zhu ,&nbsp;Jamie Rhome ,&nbsp;Cody Fritz","doi":"10.1016/j.csr.2024.105251","DOIUrl":"10.1016/j.csr.2024.105251","url":null,"abstract":"<div><p>In this study, the storm-tide and waves associated with Hurricanes Irma and Maria that struck Puerto Rico (PR) successively in 2017 were simulated using a coupled circulation and spectral wave model (TELEMAC2D + TOMAWAC), and validated against water level and wave measurements from gauges deployed around the island. Particular emphasis was placed on the storm-tide and wave interaction in the coastal area of San Juan, the capital of PR. At the San Juan coast, Irma caused a maximum of <span><math><mo>∼</mo></math></span>0.2 m surge and 0.2–0.3 m wave setup, while Maria induced a larger maximum surge of nearly 1.0 m but a smaller wave setup at 0.1 - 0.2 m. Meanwhile, Irma-induced waves caused a strong westward longshore current (<span><math><mo>∼</mo></math></span>2 m/s), which interacted with the storm-tide associated eastward current (<span><math><mo>∼</mo></math></span>0.5 m/s) and led to small-scale gyres (several hundred meters in diameter) and rip currents formed near the coast, that in turn affected the significant wave height (SWH) locally. In contrast, during the passage of Maria, the wave- and storm-tide-induced longshore currents were in the same westward direction (maximum at <span><math><mo>∼</mo></math></span>1 m/s and <span><math><mo>∼</mo></math></span>3 m/s respectively); the strong current first refracted the waves towards the following current status (wave and current propagating in the same direction) and then decreased the significant wave height by nearly 2 m in a relatively large area (<span><math><mo>∼</mo></math></span>2 km wide band along the coastline) off the coastal shelf.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141037192","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":"Comparative VGP models to analyse the primary productivity in the north Indian ocean and the linkages with rising sea surface temperature","authors":"Monika Makwana,&nbsp;Unmesh Patnaik","doi":"10.1016/j.csr.2024.105254","DOIUrl":"10.1016/j.csr.2024.105254","url":null,"abstract":"<div><p>The Primary Productivity of an ecosystem is an indicator of the health of the marine ecosystem and fishing yield. Primary productivity across the continental sea of the North Indian Ocean (NIO) basin was estimated using two vertically generalised production models. We examine the productivity using two non-parametric tests and present the changes using a gridded basin map. In the Behrenfeld and Falkowski (BF) approach, estimated primary productivity shows a significant decline of over 6550 km² from 2003 to 2020, recorded spatially 100 km² adjacent to the coastline. However, an area of 825 km² across the exclusive economic zone of the Indian sub-continent has seen a significant rise in primary productivity. The Kameda and Ishizaka (KI) model limits productivity reduction to 2500 km² across the NIO basin. The seasonal trends indicate reduced summer productivity across the basin. Both models point towards a significant reduction of productivity observed across the Bay of Bengal (BoB) and Arabian Sea (ARS) coastal regions owing to the damaging effects of anthropogenic-induced global warming. Secondly, simultaneous regression analysis using climate-based indicators and satellite-based NPP and Chlr-a data shows a significant reduction with high magnitude in the levels of NPP across the BoB and ARS between 1997 and 2020 due to rising sea surface temperature and a reduction of 9% and 6% in chlorophyll-a levels, respectively. These results point towards the inverse linkage between the rising SST on the primary productivity of the NIO basin and its devastating impacts on marine fisheries, especially in the BoB. These findings underscore the need for urgent action to mitigate the impacts of climate change and promote sustainable management of marine resources.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141030218","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":"Spatio-temporal variation of mesozooplankton in the northern coastal waters of Bay of Bengal","authors":"Alfisa Siddique ,&nbsp;Jasmine Purushothaman ,&nbsp;Aishee Bhowal ,&nbsp;Haritha Prasad ,&nbsp;Dhriti Banerjee","doi":"10.1016/j.csr.2024.105250","DOIUrl":"10.1016/j.csr.2024.105250","url":null,"abstract":"<div><p>Mesozooplankton (MSP) are significant primary and secondary consumers in aquatic ecosystems that influence biogeochemical cycles and are considered important bioindicators of ecosystem functioning. Data on the spatio-temporal variability of the MSP population from the estuarine and coastal waters of northwestern Bay of Bengal (BoB) is scarce. The present study is the first detailed investigation on the spatio-temporal dynamics of MSP along the estuarine and coastal waters of northwestern BoB from two contrasting seasons over a period of three years based on univariate and multivariate statistical analyses. The crucial drivers for spatio-temporal variability in the MSP community were water temperature, salinity, dissolved oxygen (DO) concentration, nutrient (nitrate, phosphate, silicate) concentrations, and Chlorophyll (Chl) <em>a</em> concentration. The highest mean MSP abundance was obtained during summer monsoon (SM). The results of this study state that there is a significant seasonal difference in the hydrographical parameters that change the community dynamics of MSP inhabiting the estuarine and coastal waters of BoB. The MSP species assemblages during winter monsoon (WM) were governed by high salinity and DO levels while those during SM were associated with high water temperature, nutrients, and Chl <em>a</em> concentration. A clear seasonal shift from the gelatinous community in WM to the crustacean community in SM was documented. A total of 172 MSP species were identified during WM, and 200 MSP species during SM, with 37 species being exclusively detected during WM and 65 species being exclusively recorded during SM. The most abundant species during WM were <em>Chrysaora caliparea</em>, <em>Cyanea nozakii</em>, <em>Sagitta bipunctata</em>, <em>Pleurobrachia pileus</em>, and <em>Acromitus flagellatus</em> to name a few and those during SM consisted of <em>Undinula vulgaris</em>, <em>Acartia (Odontacartia) spinicauda</em>, <em>Oithona simplex</em>, <em>Oithona similis</em>, and <em>Oncaea venusta.</em> Copepoda was the most dominant taxa during all sampling seasons, while ichthyoplankton and meroplankton fauna were low during WM and comparatively higher during SM, indicating the top-down control of their population by gelatinous taxa. Biodiversity indices reflected well to excellent diversity patterns of MSP. In the current scenario of global warming and climate change, our research highlights the need for comprehensive long-term monitoring of estuarine and coastal waters of western BoB, which harbour a rich marine faunal diversity, to identify the bioindicators of seasonal variability among major MSP groups.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062356","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":"Effect of bathymetry data on tsunami wave ray tracing in the western Banten sea","authors":"Arnida L. Latifah ,&nbsp;Henokh Lugo Hariyanto ,&nbsp;Rido Dwi Ismanto","doi":"10.1016/j.csr.2024.105247","DOIUrl":"10.1016/j.csr.2024.105247","url":null,"abstract":"<div><p>The lack of tsunami wave warning during the Anak Krakatau collapse in 2018 resulted in devastating damage to coastal areas. The tsunami wave arrived in the coastal areas approximately half an hour after the collapse. As a tsunami wave can travel abruptly, an early warning system should warn faster. However, a warning system based on a sophisticated hydrodynamic model in real-time would take time to conduct the numerical tsunami wave simulation. Hence, this study proposes a fast and reliable estimation of tsunami wave propagation through a classic ray tracing analysis. We use two ray-tracing methods to investigate the tsunami wave propagation from Anak Krakatau to the western Banten Sea. The first method follows Snell’s law, considering dispersive waves, and the second assumes non-dispersive waves based on the ray tracing equations, considering the Earth’s sphericity. Both methods are quantitatively evaluated by comparing the travel time measured at Anyer and Marina Jambu. This study finds that non-dispersive wave tracing performs a shorter computational time and slightly better prediction of tsunami wave propagation than dispersive-based wave tracing, with a relative absolute difference of the travel time of 17.9–26.7% in Anyer and 3.6–5.2% in Marina Jambu. This study also confirms the importance of bathymetry validity in wave ray tracing. Two regional bathymetry datasets with a mean difference of less than 5 m result in different wave ray tracing, in which one dataset does not produce the wave ray path towards the Panaitan Island. Based on bathymetric surveys in Anyer and Marina Jambu, the national bathymetry data (BATNAS) has shown its superiority to being used as a bathymetry in the ray-tracing process, with correlations of 81% and 93% in both areas compared to other available bathymetry datasets. We summarize that reliable bathymetry data and the non-dispersive ray tracing method can be used as an initial estimation of tsunami wave propagation efficiently.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141030417","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":"Drivers of neritic water intrusions at the subtropical front along a narrow shelf","authors":"Erik E. Johnson ,&nbsp;Charine Collins ,&nbsp;Sutara H. Suanda ,&nbsp;Stephen R. Wing ,&nbsp;Kim I. Currie ,&nbsp;Jesse Vance ,&nbsp;Robert O. Smith","doi":"10.1016/j.csr.2024.105248","DOIUrl":"10.1016/j.csr.2024.105248","url":null,"abstract":"<div><p>The near-ubiquitous presence of freshwater over the inner to mid-continental shelf off of the Otago Peninsula in southeast Aotearoa/New Zealand has been previously identified in long-term cross-shelf transects. Occasional influxes of this silicate-rich neritic water past the shelf break and beyond the Subtropical Front have been observed, potentially supporting elevated chlorophyll-a concentrations in SubAntarctic waters. Nearshore salinity variability has been connected to flow rates of the Clutha River, Aotearoa’s largest river by discharge, however, other physical mechanisms influencing the structure of freshwater along this coast have not been explicitly explored. A numerical model of Aotearoa’s southeast continental shelf forced with realistic discharge from the Clutha River is used to assess the drivers of river plume variability and identify conditions associated with the transport of neritic water beyond the shelf break. Event scale, lagged correlation, EOF, and composite analysis of a model passive dye tracer revealed three generalised plume structures that are dependent on river discharge, along-front wind stress, and shelf current velocities. Downfront wind stress suppresses bulge formation at the river mouth and constrains the river plume against the coast, whereas upfront wind stress causes the river plume to move offshore over the shelf and spread across the upper water column. Rarely, upfront wind stress generates a nearshore current reversal over the shelf, causing the plume to deflect straight off-shelf and across the shelf edge before meeting the frontal current and advecting to the northeast. Future observational work is required to validate the mechanisms described and address the biological implications of these findings.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324000785/pdfft?md5=2959a9c7df909641ce7f8c2db526e909&pid=1-s2.0-S0278434324000785-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141024871","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":"Optimized regulation of the Vistula River at its connection to the sea","authors":"Grzegorz R. Cerkowniak ,&nbsp;Rafał Ostrowski ,&nbsp;Jan Schönhofer ,&nbsp;Magdalena Stella-Bogusz ,&nbsp;Marek Szmytkiewicz ,&nbsp;Piotr Szmytkiewicz","doi":"10.1016/j.csr.2024.105244","DOIUrl":"10.1016/j.csr.2024.105244","url":null,"abstract":"<div><p>The paper deals with the morphodynamics of the artificially engineered outlet of the Vistula River, Poland. The delta is a coastal form typical of semi-closed micro-tidal or non-tidal seas, such as the Baltic Sea. This accumulative sandy form in front of the Vistula mouth constitutes a serious obstacle to the flow of water and sediment at the river-sea interface. Therefore, regulation works need to be carried out periodically. The present mathematical modeling applies the representative flushing discharge accompanied by marine hydrodynamic processes to particular variants of regulation of the Vistula mouth. The envelope method of analyzing the modeled bottom changes is used to formulate practical conclusions. The major findings concern the optimal extension of the breakwaters at the river mouth, sufficient to ensure the outlet patency.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140759479","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":"Benthic foraminifera as depth estimators in the tropical carbonate shelf of northeastern Brazil","authors":"Davy Barbosa Bérgamo ,&nbsp;Josefa Nilmara Lopes Lacerda ,&nbsp;Rilda Verônica Cardoso de Araripe ,&nbsp;Antônio Vicente Ferreira Júnior ,&nbsp;David Holanda de Oliveira","doi":"10.1016/j.csr.2024.105246","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105246","url":null,"abstract":"<div><p>Benthic foraminifera are valuable proxies for oceanographic and environmental research due to their high degree of species-specific habitat use. The present study describes the distribution of benthic foraminifera across the continental carbonate shelf of northeastern Brazil, and relates their distribution patterns to environmental parameters associated with the texture of the sediment and the depth of the water. Sediment samples were collected at depths between 0.5 and 57 m. In the laboratory, the samples were analyzed following the standard protocol established for Quaternary foraminifera research. Sediments dominated by carbonate sand, which were approximately symmetric in the first depth interval (0.5–20 m), and asymmetric in the second (20–40 m) and third (40–57 m) intervals. The foraminiferal assemblages composed of 96 species, although they were dominated by the five species – <em>Archaias angulatus</em>, <em>Textularia agglutinans</em>, <em>Amphistegina lessonii</em>, <em>Quinqueloculina lamarckiana</em>, and <em>Peneroplis carinatus</em>. Most tests were intact and the species composition varied across the continental shelf, with <em>Pseudotriloculina laevigata</em> and <em>Globobulimina</em>? sp. Only occurring from 0.5 to 20 m depth in shelf, while <em>Pyrgo elongata</em>, <em>Quinqueloculina</em> sp. A, <em>Quinqueloculina</em> sp. C, <em>Fissurina</em> sp. A, <em>Fissurina</em> sp. B, <em>Elphidium morenoi</em>, <em>Glabratella brasilensis,</em> and <em>Siphogenerina</em> sp. Were restricted from 20 to 40 m, and <em>Sigmoilina</em> sp., <em>Fursenkoina</em> sp., and <em>Textularia</em> sp. A was only recorded in depth &gt;40 m. The diversity of the foraminiferal assemblages is favored by the attenuation of hydrodynamic conditions at deeper intervals (20–57 m). Therefore, it can be concluded that the benthic foraminiferal species respond to the depth and variation in sediment characteristics through changes in their population and assemblage structures.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140901064","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":"Numerical study on hydrodynamic impacts of 3D excavation pit on tsunami-like wave at fringing reef","authors":"K. Qu,&nbsp;J.J. Li,&nbsp;Y. Yao,&nbsp;X. Wang","doi":"10.1016/j.csr.2024.105243","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105243","url":null,"abstract":"<div><p>In recent years, dredging reef sand and aggregate as building materials for infrastructures has become a common practice in many atoll islands, which can significantly reshape the wave hydrodynamic environment at the fringing reef. Hence, it becomes necessary to evaluate the hydrodynamic impacts of excavation pits at fringing reef. However, previous research adopted a simplified two-dimensional (2D) excavation pit model, which ignores the influences of 3D geometric characteristics of excavation pit. This study performs a three-dimensional (3D) numerical study on the hydrodynamic impacts of 3D excavation pit on tsunami-like wave at fringing reef by using a nonhydrostatic wave model (NHWAVE). Impacts of several main factors, such as water depth, wave height, pit location, geometric dimensions of pit, the spacing between two serially connected pits and the spacing between two parallel connected pits are carefully discussed. Research results reveal that 3D excavation pit can significantly reshape the wave hydrodynamic environment at the fringing reef, especially the local wave height at the pit. In addition to wave breaking at the reef edge, the 3D excavation pit can further damp out a portion of energy of the breaking surge bore, which can reduce the maximum value of wave runup height at centerline of computational domain. However, maximum value of wave runup height near the two sides of pit are slightly increased to some extent.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140644111","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 shoreline detection method with X-band marine radar","authors":"Wendy Navarro ,&nbsp;Juan C. Velez ,&nbsp;Alejandro Orfila","doi":"10.1016/j.csr.2024.105233","DOIUrl":"https://doi.org/10.1016/j.csr.2024.105233","url":null,"abstract":"<div><p>The assessment of morphological mapping capacity of X-band radars is performed by comparing radar-derived shoreline estimates with in-situ data measured from DGPS-RTK surveys in Cala Millor beach (October 22–24, 2018). Radar estimates are obtained by applying an automatic method based on digital image processing, threshold segmentation and first-order derivative filters on X-Band radar variance images. The study site is covered by the endemic <em>Posidonia oceanica</em> seagrass meadow at the seabed. It represents a challenge on the estimation of local shoreline. Results reveal that X-band radar estimate the shoreline location with a mean bias of 4.66 m, a relative error of 2.95% and a RMSE of 14.07 m. Also, the beach morphology is assessed by the identification of surrounding rocky outcrops and a submerged sandbar. Since the obtained radar estimation errors are comparable with the reported by previous studies but using video-cameras, results reveal a potential complementary use of both marine radars and optical cameras to provide higher-resolution and more accurate shoreline measurements in a broader area.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324000633/pdfft?md5=8e6bad4268b2afda5b97d7cc3a732e6c&pid=1-s2.0-S0278434324000633-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632588","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}