Continental Shelf Research最新文献

{"title":"Distribution of methane in the upper water layer of the northern Black Sea: Seasonal and daily trends and seawater-air emissions","authors":"T.V. Malakhova ,&nbsp;A.I. Khurchak ,&nbsp;V.V. Voitsekhovskaia ,&nbsp;A.V. Fedirko","doi":"10.1016/j.csr.2024.105320","DOIUrl":"10.1016/j.csr.2024.105320","url":null,"abstract":"<div><p>We report on methane (CH₄) concentration measurements in the northern Black Sea area conducted during 6 cruises with R/V <em>Professor Vodyanitsky</em> from 2017 to 2019. Our work is a multi-season study at a uniform station grid covering an area of 88 × 10³ km² and including three latitudinal transects that comprises both surface and vertical profile water-column measurements. The main goal of the work was to assess the seasonal patterns of vertical CH₄ structure in the aerobic water column (upper 100 m) and its emission to the atmosphere.</p><p>In surface waters, the mean dissolved CH₄ concentration ranged from 2.6 nmol L⁻¹ detected in November 2018 to 11.5 nmol L⁻¹ measured in June–July 2018, respectively. Calculated CH₄ seawater-air fluxes and saturations were mostly positive (i.e. net flux to atmosphere), and winter fluxes (2.6 μmol m⁻² d⁻¹) were higher than summer fluxes (1.6 μmol m⁻² d⁻¹) due to the higher wind speed. The integral CH₄ flux from the whole study area (88 × 10³ km²) ranged from 84 to 235 kM day⁻¹.</p><p>It was shown that, on average, the methane concentration in the upper layer for deep-water stations where the seabed is located at depths &gt;160 m (σt &gt;16.2) was lower compared to stations at shallow water depths (28–140 m, σt &lt;16.2). The most distinct difference was obtained for the summer season (June–July 2018) and a less significant difference – for spring (April–May 2019) and winter season (November–December 2018). During these seasons the water column was also considerably less saturated in CH₄ compared to the entire monitoring period. We observed subsurface maxima, which were generally located at the base of the thermocline and exceeded 100 nmol L⁻¹ at some stations. Exceptions were observed in October 2019 (cruise 110), when vertical CH₄ distributions were characterized by two-peaks at ∼20 and ∼50 m depth. The strong influence of the thermohaline structure on the water column CH₄ distribution has also been shown in studies of daily dynamics of CH₄ vertical profiles in the shallow water region. Despite the high variability of CH₄ concentrations, significant similarities in vertical distributions of CH₄ and chlorophyll-a for which sub-surface maxima coincided at some stations, are shown. Extremely high concentrations of CH₄ (up to 351 nmol L⁻¹) in the near-bottom water layer were revealed during all seasons at the station near the Dnieper paleo-channel at the northwestern edge of the study area. This enrichment is assumed to be caused by methane emissions from gas seeps densely located in this region.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"281 ","pages":"Article 105320"},"PeriodicalIF":2.1,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142098443","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":"Changing source waters on the Northeast US Continental Shelf: Variation in nutrient supply and phytoplankton biomass","authors":"Kevin D. Friedland ,&nbsp;Paula Fratantoni ,&nbsp;Adrienne Silver ,&nbsp;Damian C. Brady ,&nbsp;Avijit Gangopadhyay ,&nbsp;Scott I. Large ,&nbsp;Ryan E. Morse ,&nbsp;David W. Townsend ,&nbsp;Marjorie A.M. Friedrichs ,&nbsp;D. Christopher Melrose","doi":"10.1016/j.csr.2024.105319","DOIUrl":"10.1016/j.csr.2024.105319","url":null,"abstract":"<div><p>The Northeast US Continental Shelf (NES) is a highly productive marine ecosystem that has experienced wide swings in phytoplankton chlorophyll concentration (CHL). To better understand this variability, we examined changes in CHL over the period 1998–2022, while also considering three indicators of the potential supply of nutrient source waters including cross-shelf advection via deep channels, transport from beyond the shelf edge via Gulf Stream warm core rings (WCR), and input from river and estuarine discharge. Traditionally, deep channel advection of water across the NES was assumed to be derived from Labrador Slope Water (LSW) and Warm Slope Water (WSW). These designations do not fully capture the range of water types contributing to cross-shelf advection. The contribution of LSW and WSW was reciprocal over time, with the presence of WSW at an increased level in recent years. There has been an increase in the number of WCRs off the NES represented by indices of ring occupancy. Precipitation increased over the study period as well, generally over the NES region and in particular in the Mid-Atlantic Bight drainage. We see evidence of the effect of increased precipitation on the NES proper through a change in the area of the ocean surface having 555 nm reflectance with sr⁻¹ &gt; 0.004. Using a canonical analysis, CHL correlated positively with the proportion of LSW and negatively with WSW. These correlations suggest there are aspects of the nutrient content associated with these water masses that are key to phytoplankton growth. WCR frequency negatively correlated with CHL, which was expected since the nutrient loadings of WCRs tends to be low. Finally, CHL negatively correlated with precipitation rate, which suggests terrestrial origin nutrient inputs to the NES are minor. We suggest that in order to understand future CHL dynamics in the NES, careful consideration of advective sources of nutrients in the Northwest Atlantic is necessary.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"281 ","pages":"Article 105319"},"PeriodicalIF":2.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076966","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":"Upwelling processes variability and water circulation along the northern margin of the Gulf of Cadiz","authors":"Luciano de Oliveira Júnior ,&nbsp;Paulo Relvas ,&nbsp;Erwan Garel","doi":"10.1016/j.csr.2024.105310","DOIUrl":"10.1016/j.csr.2024.105310","url":null,"abstract":"<div><p>The present study investigates the contributions of upwelling mechanisms (coastal upwelling from boundary divergence and Ekman pumping from spatially variable wind) at the northern margin of the Gulf of Cadiz (NMGoC) based on high-resolution wind. The effects of the spatiotemporal upwelling mechanisms variability are then explored using current observations along with sea surface temperature and sea level anomaly. Upwelling favourable conditions occur throughout the year along the NMGoC, with the strongest intensity near Cape São Vicente due to a persistent positive wind stress curl. In winter, the surface water divergence is restricted to the coastal boundary due to strong coastal upwelling events that result in a cross-shore sea-level gradient close to the coast. Towards the summer, the gradient increases and extends further offshore (over the slope) at the western region due to the intensification of the Ekman pumping. Therefore, the seasonal and spatial variability of coastal upwelling and Ekman pumping contributes significantly to the offshore position of the geostrophic Gulf of Cadiz Current over the western shelf slope. Furthermore, a permanent sea level depression corresponds to the location of the strongest Ekman pumping, near Cape São Vicente. The dynamic adjustment of this feature may drive the cyclonic cell and alongshore poleward currents often observed in the area.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"281 ","pages":"Article 105310"},"PeriodicalIF":2.1,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324001407/pdfft?md5=0a56a13336abbc5b4cd13c91f8d1d149&pid=1-s2.0-S0278434324001407-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142075860","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":"Copepod community in the coastal waters off Kochi (India) signify the enhanced estuarine flushing during the Southwest Monsoon","authors":"S. Parthasarathi ,&nbsp;R. Jyothibabu ,&nbsp;N. Arunpandi ,&nbsp;V. Vidhya ,&nbsp;C.P. Rashid ,&nbsp;R.T. Jebarani ,&nbsp;S. Santhikrishnan","doi":"10.1016/j.csr.2024.105309","DOIUrl":"10.1016/j.csr.2024.105309","url":null,"abstract":"<div><p>Even though many studies refer to copepods as potential indicators of hydrographical settings and/or water masses, focused studies on this aspect are very scarce in Indian waters. Hence, this study assesses the hydrography and the copepod composition in a cross-shore transect (7–30 m depth zone) off Kochi along the southwest coast of India during different seasons to understand how seasonal hydrography alters the composition of copepods. The copepod community in the study area was found to consist of 36 species (26 dominant) during the Southwest Monsoon [(SWM) June to September], 31 species (16 dominant) during the Northeast Monsoon [(NEM) November to February], and 39 species (26 dominant) during the Pre-Monsoon [(PRM) March to May]. The salient observations in this study are (a) a higher contribution of cyclopoids (45–50%) during the oligotrophic PRM when the microbial food web was dominant; (b) the dominance of several truly estuarine copepods (<em>Acartia plumosa</em>, <em>Acartiella keralensis</em>, <em>Pseudodiaptomous annandalei</em>, and <em>P. serricaudatus</em>) during the SWM when the flushing of the adjacent estuarine system (Kochi backwaters) was the seasonal highest; and (c) the dominant occurrence of <em>Temora turbinata</em>, commonly referred to as an indicator of coastal upwelling, during both the SWM and the NEM indicates their conducive conditions in the study area during both seasons and (d) the occurrence of copepods <em>Acartia danae</em>, <em>A. erythraea</em>, <em>Acrocalanus gibber</em>, <em>A</em>. <em>gracilis</em>, <em>Centropages orsinii</em>, <em>C. tenuiremis</em>, <em>Corycaeus catus</em>, <em>C. speciosus</em>, <em>Oithona similis</em>, <em>O. spinirostris</em>, <em>Oncaea venusta</em>, <em>Paracalanus parvus</em>, and <em>Undinula vulgaris</em> in the study area regardless of seasons. The study concludes that, while the presence of truly estuarine copepods in the study area can be attributed to estuarine watermass indicators, the presence of several other dominant species found regardless of the season cannot, as their occurrence is widespread in the eastern Arabian Sea and the western Bay of Bengal, owing to seasonal water mass exchange between the two regions.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"280 ","pages":"Article 105309"},"PeriodicalIF":2.1,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993768","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":"Ecological assessment of macrobenthic communities in Chabahar Bay, the Gulf of Oman","authors":"Hoda Khaledi","doi":"10.1016/j.csr.2024.105308","DOIUrl":"10.1016/j.csr.2024.105308","url":null,"abstract":"<div><h3>Aim</h3><p>Assessing the potential of the Chabahar Bay coasts for classification as marine and coastal protected areas.</p></div><div><h3>Location</h3><p>Chabahar Bay, northeast of the Gulf of Oman.</p></div><div><h3>Period</h3><p>Two seasons from 2017 to 2019.</p></div><div><h3>Major taxa studied</h3><p>Macrobenthic invertebrates.</p></div><div><h3>Methods</h3><p>The evaluation was based on the 2008 International Union for Conservation of Nature (IUCN) ecological model categories and criteria/sub-criteria. The study investigated criteria such as biodiversity, naturalness, dependency, representativeness, uniqueness, productivity, vulnerability, and integrity; the study was conducted at four zones of three stations within three regions.</p></div><div><h3>Results</h3><p>The northern region of Chabahar Bay showed significant differences in community structure compared to the other two regions. The highest abundance of macrobenthic invertebrates was observed in the northern area of Chabahar Bay, whereas the lowest abundance was observed in Konarak. Macrobenthic abundance, salinity, and electrical conductivity (EC) were found to influence the community structure of macrobenthic organisms; each region was assigned a score, categorizing it as an IUCN Category II protected area.</p></div><div><h3>Main conclusions</h3><p>The AMBI analysis revealed that some ecosystems in the studied regions were alarmingly disturbed, indicating the need for management attention to protect and conserve these ecosystems.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"280 ","pages":"Article 105308"},"PeriodicalIF":2.1,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141951017","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":"Geochemical and Isotopic evidence for volcanism on the Alleppey Terrace, southwest Indian continental margin","authors":"Reji Srinivas ,&nbsp;M.K. Sreeraj ,&nbsp;A. Prajith ,&nbsp;Bivin G. George ,&nbsp;Jyotiranjan S. Ray","doi":"10.1016/j.csr.2024.105301","DOIUrl":"10.1016/j.csr.2024.105301","url":null,"abstract":"<div><p>The Arabian Sea consists of prominent undersea bathymetric highs whose genesis is often attributed to volcanism either related to the 90-85 Ma Marion or the 70-65 Ma Reunion hot spot activity on the Indian Plate. The enigmatic Alleppey Terrace (AT) is one such significant bathymetric high in the southwestern continental margin of India. We studied the siliciclastic sediments deposited on the AT and the adjacent shelf region using major/trace element, and Sr-Nd isotope geochemistry to decipher their provenances and implications of the findings for the origin of the Terrace. Geochemical data suggest that the AT sediments are chemically distinct from the adjacent shelf sediments, with the former having been sourced from juvenile mafic rocks and the latter from significantly older, felsic continental crustal rocks. Although currently located at a water depth of ∼300 m, AT was likely exposed above the sea level in the past and had undergone subaerial weathering and lateritization. The ε_Nd of AT sediments (−17.1 to −10.9), which is much radiogenic than that of the shelf sediments (−26.4 to −22.2), indicates significant presence of a juvenile basaltic component - likely derived from <em>in situ</em> weathering of the local seafloor/basement. The common component in both the terrace and shelf sediments appears to be terrigenous, deposited by the local rivers draining the Western Ghats. Conspicuous similarities of trace element ratios and isotopic compositions of the terrace sediments with those of the volcanic rocks temporally and spatially related to the Deccan volcanism suggest that the AT may contain traces of the end Cretaceous Reunion-Deccan plume/hotspot activity on the India subcontinent.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"280 ","pages":"Article 105301"},"PeriodicalIF":2.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141951652","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":"Geochemical characteristics and provenance of metals in surface sediments of hydrate area, northern south China sea","authors":"Cai Lin ,&nbsp;Hui Lin ,&nbsp;Xuebao He ,&nbsp;Jinmin Chen ,&nbsp;Xiuwu Sun ,&nbsp;Qianyong Liang ,&nbsp;Yang Liu","doi":"10.1016/j.csr.2024.105298","DOIUrl":"10.1016/j.csr.2024.105298","url":null,"abstract":"<div><p>Geochemical characteristics and provenance of metals in surface sediments of hydrate area, northern South China Sea has not been reported yet, therefore this paper aimed to reveal metals' distribution, assess the pollution of potentially hazradous metals (Cu, Pb, Zn, Cd, Cr, As, Hg), and inferred provenance of metals using principal component analysis. Twenty-five surface sediments were collected by box sampler from 2014 to 2015 in the national special project on gas hydrate. The concentration of MnO and Hg varied greatly. Most of metals were higher in the north of study area. The sediment was mainly polluted by Hg either pollution status or ecological risk, while it's also moderately polluted by Cr and moderately ecological polluted by Cd. The metals were mainly related to terrigenous detrital, biological source, some volcanic activities, and also little atmospheric deposition. Our findings would further improve the understanding of metals and their related biogeochemical process.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"280 ","pages":"Article 105298"},"PeriodicalIF":2.1,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141950254","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 fortnightly and seasonal changes in estuarine physical variables on phytoplankton distribution in a macrotidal monsoon estuary","authors":"Lett Wai Nwe,&nbsp;Gubash Azhikodan,&nbsp;Katsuhide Yokoyama","doi":"10.1016/j.csr.2024.105292","DOIUrl":"10.1016/j.csr.2024.105292","url":null,"abstract":"<div><p>Seasonal and neap-spring tidal changes in estuarine physical variables and their effect on the phytoplankton distribution in the macrotidal Tanintharyi River estuary (TRE), Myanmar were studied in 2019. During the dry season, the saltwater intrudes upstream while only until the mid-estuary during the wet season due to the hindering of saltwater by the strong river flow. The turbidity variations driven by enhanced mixing and neap-spring transition influenced the light required for phytoplankton growth during both seasons. The diversity index was higher (2.57–3.07) in the dry season with low evenness (0.64–0.79) compared to the low diversity index (2.16–2.73) with high evenness (0.75–0.90) in the wet season. The peak diatom density was observed under low turbidity (6 FTU) and a salinity of 25, and their distribution were correlated positively with salinity, mean light intensity in the mixed layer (I_m) and euphotic depth (Z_e) while negatively with light attenuation (K) and turbidity. Among diatoms species, <em>Thalassionema frauenfeldii</em>, <em>Thalassionema nitzschioides</em> and <em>Pseudonitzschia seriata</em> were found as dominant species (positively correlated with salinity and I_m whereas negatively with turbidity and K) during the dry season whereas <em>Thalassiosira eccentrica</em> and <em>Coscinodiscus granii</em> were dominant with low salinity in the wet season. The dinoflagellates were more sensitive to strong mixing condition than diatoms and their distribution were positively influenced by I_m and Z_e. Therefore, the neap-spring tidal and seasonal variations in saltwater intrusion, mixing, turbidity, and light availability are the major factors that maintained the phytoplankton diversity in the tropical TRE.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"279 ","pages":"Article 105292"},"PeriodicalIF":2.1,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141705816","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 influence of seabed geology on the nature and preservation of bottom trawl marks in the Bornholm Basin, southern Baltic Sea","authors":"Martin Jakobsson ,&nbsp;Matt O'Regan ,&nbsp;Mattias Sköld ,&nbsp;Patrik Jonsson ,&nbsp;Clare Bradshaw","doi":"10.1016/j.csr.2024.105297","DOIUrl":"10.1016/j.csr.2024.105297","url":null,"abstract":"<div><p>This study investigates six areas in a historically heavily trawled region of the southern Baltic Sea. Using acoustic geophysical mapping data and sediment cores from three field campaigns (2019, 2020, 2023), we evaluate and quantify the cumulative physical impacts from bottom trawling and the influence of seabed geology on mapped trawl tracks. The results are compared with fishing intensity data over three periods; 2012–2016, 2017–2019 and after the fishery closed. A correlation between fishing intensity and density of mapped trawl tracks exists in the soft sediments of the northern part of the area, while this link is weak in the less trawled southern part, where the seabed is characterized by more consolidated glacial clays and the high density of mapped trawl tracks reflects the preservation of tracks &gt;8 years old. Four years after the closure of the fishery there were no signs of trawl-track degradation in any of the areas. In summary, mapped track densities alone are not a suitable measure of trawling intensity, considering the influence of seabed geology and the persistence of trawl tracks over time. Sediment deformation, observed by CT-scanning, indicates extensive remoulding and coarsening of the upper 20–40 cm of sediments in the trawled areas.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"279 ","pages":"Article 105297"},"PeriodicalIF":2.1,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0278434324001274/pdfft?md5=7450df5b121bf3fabbefdac824536e3d&pid=1-s2.0-S0278434324001274-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141844468","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":"The coalescence of two mangrove-lined river plumes and consequences for sediment transport and deposition in a coastal environment","authors":"Hemanth Vundavilli ,&nbsp;Julia C. Mullarney ,&nbsp;Iain T. MacDonald","doi":"10.1016/j.csr.2024.105280","DOIUrl":"10.1016/j.csr.2024.105280","url":null,"abstract":"<div><p>We employed idealized numerical experiments using Delft3D to investigate how the interactions of coalescing buoyant river plumes with mangrove vegetation affect sediment transport and deposition in the coastal zone. Our model system, based on the Firth of Thames in the North Island of New Zealand, is designed to represent two mangrove-lined rivers debouching into a coastal bay. Sediment transport patterns into the three adjacent mangrove forest regions (central, western, and eastern) were assessed by quantifying the sediment fluxes over a tidal cycle. The interactions between the buoyant river plumes resulted in a coalesced river plume that flowed along the central mangrove forest between the rivers. The dominant contributors to the total sediment transport into the mangrove forests varied with both the total and the relative flows through the two rivers. When both rivers were forced with their respective flows at the 50th percentile of observed flow, the analysis of sediment transport fluxes along the central forest revealed sediment deposition inside the mangrove forests lining the river mouth nearly four times greater than in the intermediate regions along the central forest; consistent with satellite imagery of the Firth of Thames. Winds of 5<!--> <!-->m s⁻¹ modify the overall sediment transport patterns by deflecting the river plume in the direction of the wind. The magnitude of sediment flux is the highest (nearly 80% compared to the no-wind scenario) in the case of an easterly wind scenario as the alongshore transport is enhanced by Coriolis deflection and wind direction aligned with the alongshore flows of the larger plume.</p></div>","PeriodicalId":50618,"journal":{"name":"Continental Shelf Research","volume":"279 ","pages":"Article 105280"},"PeriodicalIF":2.1,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141846020","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}