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Journal articles on the topic 'Processus estuaire'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Drapeau, Georges, and Rémy Morin. "Contribution des vagues au transport des sédiments littoraux dans la région de Trois-Pistoles, estuaire du Saint-Laurent, Québec." Géographie physique et Quaternaire 35, no. 2 (2011): 245–51. http://dx.doi.org/10.7202/1000441ar.

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Dans la région de Trois-Pistoles, l’action des vagues est moins importante en raison de la prédominance que prennent le glaciel et la marée dans le transport des sédiments littoraux de cette région. La disparité et le mauvais triage des sédiments de surface montrent que plusieurs processus sédimentologiques contribuent à la répartition des sédiments récents. L’influence de la marée dont le marnage atteint 5 m et celle des glaces flottantes dont l’activité dure environ 100 jours par année sont des processus relativement bien connus. L’analyse de l’action des vagues est basée sur le modèle de mi

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Dionne, Jean-Claude. "Données quantitatives sur les cailloux à la surface du couvert glaciel, estuaire du Saint-Laurent." Géographie physique et Quaternaire 47, no. 2 (2007): 181–92. http://dx.doi.org/10.7202/032947ar.

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RÉSUMÉ À plusieurs endroits, le couvert glaciel des rivages de l'estuaire du Saint-Laurent contient des débris grossiers. Un relevé des cailloux à la surface de la glace a été fait dans quatre sites. On y a mesuré plus de 300 cailloux pesant entre un kilo et une tonne. Dans les sites étudiés, les cailloux de petite taille (1 à 20 kg) prédominent avec 60 %; les cailloux de 20 à 50 kg comptent pour 25 %; les autres ont un poids supérieur à 50 kg. Dans trois des sites étudiés, la débâcle est survenue le lendemain des observations. Les cailloux à la surface de la glace ont donc été évacués au larg

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Brodeur, Denis, and Michel Allard. "Les plates-formes littorales de l’île aux Coudres, moyen estuaire du Saint-Laurent, Québec." Géographie physique et Quaternaire 37, no. 2 (2007): 179–95. http://dx.doi.org/10.7202/032513ar.

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RÉSUMÉ De larges plates-formes littorales ceinturent l'île aux Coudres, dans le moyen estuaire du Saint-Laurent. Le substrat rocheux est constitué de microgrès et de schistes à forts pendages. L'environnement océanographique est caractérisé par un régime marégraphique semi-diurne macrotidal, des eaux saumâtres, de forts courants de marée généralement parallèles aux rivages, et des vagues relativement importantes du sud-ouest et du nord-est suivant l'axe du Saint-Laurent. Une saison glacielle de 4 mois environ permet le développement d'un pied de glace en hiver. Des profils topographiques levés

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Dinauer, Ashley, and Alfonso Mucci. "Spatial variability in surface-water <i>p</i>CO<sub>2</sub> and gas exchange in the world's largest semi-enclosed estuarine system: St. Lawrence Estuary (Canada)." Biogeosciences 14, no. 13 (2017): 3221–37. http://dx.doi.org/10.5194/bg-14-3221-2017.

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Abstract. The incomplete spatial coverage of CO2 partial pressure (pCO2) measurements across estuary types represents a significant knowledge gap in current regional- and global-scale estimates of estuarine CO2 emissions. Given the limited research on CO2 dynamics in large estuaries and bay systems, as well as the sources of error in the calculation of pCO2 (carbonic acid dissociation constants, organic alkalinity), estimates of air–sea CO2 fluxes in estuaries are subject to large uncertainties. The Estuary and Gulf of St. Lawrence (EGSL) at the lower limit of the subarctic region in eastern C

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Gomes, Vando J. C., Nils E. Asp, Eduardo Siegle, et al. "Suspended-Sediment Distribution Patterns in Tide-Dominated Estuaries on the Eastern Amazon Coast: Geomorphic Controls of Turbidity-Maxima Formation." Water 13, no. 11 (2021): 1568. http://dx.doi.org/10.3390/w13111568.

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In tide-dominated estuaries, maximum-turbidity zones (MTZs) are common and prominent features, characterized by a peak in suspended-sediment concentration (SSC) associated with estuarine processes. The Brazilian Amazon coast includes many estuaries, experiencing macrotidal conditions. MTZs are expected to occur and are crucial for sediment delivery to the longest continuous mangrove belt of the world. The area is under influence of the Amazon River plume (ARP), the main SSC source, as local rivers do not deliver substantial sediment supply. To assess the processes that allow the ARP to supply

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R., Anusiya, and Sukumaran M. "Assessment of Seasonal Variation (2020 to 2021) in Physico-Chemical Parameters of Nandalar Estuary in East Coast of Tamil Nadu, India." International Journal of Zoological Investigations 08, special issue (2022): 254–58. http://dx.doi.org/10.33745/ijzi.2022.v08i0s.030.

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Estuaries are defined as the areas between rivers and the ocean that have unique ecological characteristics, a wealth of flora and fauna, and are essential to both biodiversity and hydrological processes. Aquatic ecosystems depend on their biological traits as well as their physical and chemical qualities. The objective of the current study was to identify seasonal variations in the physico-chemical parameters of Tamil Nadu's Nandalar Estuary. The physico-chemical characteristics of the Nandalar Estuary were recorded which have an impact on the estuarine environment. Future analyses of the eco

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Schmidt, Sabine, and Ibrahima Iris Diallo. "Hypoxia also occurs in small highly turbid estuaries: the example of the Charente (Bay of Biscay)." Biogeosciences 21, no. 7 (2024): 1785–800. http://dx.doi.org/10.5194/bg-21-1785-2024.

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Abstract. The French coast facing the Bay of Biscay (North-East Atlantic) is characterised by the presence of small macrotidal and turbid estuaries, including the Charente, which is geographically located between the two large estuaries of the Gironde and the Loire (south-west France). Multi-year, multi-site and high-frequency water quality surveys have shown that the Loire and, to a lesser extent, the Gironde suffer from summer hypoxia. These observations raised the question of the possible occurrence of hypoxia, particularly in one of these small estuaries, the Charente, which flows into the

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Braat, Lisanne, Thijs van Kessel, Jasper R. F. W. Leuven, and Maarten G. Kleinhans. "Effects of mud supply on large-scale estuary morphology and development over centuries to millennia." Earth Surface Dynamics 5, no. 4 (2017): 617–52. http://dx.doi.org/10.5194/esurf-5-617-2017.

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Abstract. Alluvial river estuaries consist largely of sand but are typically flanked by mudflats and salt marshes. The analogy with meandering rivers that are kept narrower than braided rivers by cohesive floodplain formation raises the question of how large-scale estuarine morphology and the late Holocene development of estuaries are affected by cohesive sediment. In this study we combine sand and mud transport processes and study their interaction effects on morphologically modelled estuaries on centennial to millennial timescales. The numerical modelling package Delft3D was applied in 2-DH

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Kleinhans, Maarten G., Lonneke Roelofs, Steven A. H. Weisscher, Ivar R. Lokhorst, and Lisanne Braat. "Estuarine morphodynamics and development modified by floodplain formation." Earth Surface Dynamics 10, no. 2 (2022): 367–81. http://dx.doi.org/10.5194/esurf-10-367-2022.

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Abstract. Rivers and estuaries are flanked by floodplains built by mud and vegetation. Floodplains affect channel dynamics and the overall system's pattern through apparent cohesion in the channel banks and through filling of accommodation space and hydraulic resistance. For rivers, effects of mud, vegetation and the combination are thought to stabilise the banks and narrow the channel. However, the thinness of estuarine floodplain, comprised of salt marsh and mudflats, compared to channel depth raises questions about the possible effects of floodplain as constraints on estuary dimensions. To

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Conroy, Ted, David A. Sutherland, and David K. Ralston. "Estuarine Exchange Flow Variability in a Seasonal, Segmented Estuary." Journal of Physical Oceanography 50, no. 3 (2020): 595–613. http://dx.doi.org/10.1175/jpo-d-19-0108.1.

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AbstractSmall estuaries in Mediterranean climates display pronounced salinity variability at seasonal and event time scales. Here, we use a hydrodynamic model of the Coos Estuary, Oregon, to examine the seasonal variability of the salinity dynamics and estuarine exchange flow. The exchange flow is primarily driven by tidal processes, varying with the spring–neap cycle rather than discharge or the salinity gradient. The salinity distribution is rarely in equilibrium with discharge conditions because during the wet season the response time scale is longer than discharge events, while during low

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Dijkstra, Yoeri M., and Henk M. Schuttelaars. "A Unifying Approach to Subtidal Salt Intrusion Modeling in Tidal Estuaries." Journal of Physical Oceanography 51, no. 1 (2021): 147–67. http://dx.doi.org/10.1175/jpo-d-20-0006.1.

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AbstractThe salinity structure in estuaries is classically described in terms of the salinity structure as well mixed, partially mixed, or salt wedge. The existing knowledge about the processes that result in such salinity structures comes from highly idealized models that are restricted to either well-mixed and partially mixed cases or subtidal salt wedge estuaries. Hence, there is still little knowledge about the processes driving transitions between these different salinity structures and the estuarine parameters at which such a transition is found. As an important step toward a unified des

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Moore-Maley, Benjamin L., Debby Ianson, and Susan E. Allen. "The sensitivity of estuarine aragonite saturation state and pH to the carbonate chemistry of a freshet-dominated river." Biogeosciences 15, no. 12 (2018): 3743–60. http://dx.doi.org/10.5194/bg-15-3743-2018.

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Abstract. Ocean acidification threatens to reduce pH and aragonite saturation state (ΩA) in estuaries, potentially damaging their ecosystems. However, the impact of highly variable river total alkalinity (TA) and dissolved inorganic carbon (DIC) on pH and ΩA in these estuaries is unknown. We assess the sensitivity of estuarine surface pH and ΩA to river TA and DIC using a coupled biogeochemical model of the Strait of Georgia on the Canadian Pacific coast and place the results in the context of global rivers. The productive Strait of Georgia estuary has a large, seasonally variable freshwater i

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Wei, Xi, Josette Garnier, Vincent Thieu, et al. "Nutrient transport and transformation in macrotidal estuaries of the French Atlantic coast: a modeling approach using the Carbon-Generic Estuarine Model." Biogeosciences 19, no. 3 (2022): 931–55. http://dx.doi.org/10.5194/bg-19-931-2022.

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Abstract. Estuaries are key reactive ecosystems along the land–ocean aquatic continuum, with significant ecological and economic value. However, they have been facing strong morphological management changes and increased nutrient and contaminant inputs, possibly leading to ecological problems such as coastal eutrophication. Therefore, it is necessary to quantify the import and export fluxes of the estuaries, their retention capacity, and estuarine eutrophication potential. The 1-D Carbon-Generic Estuary Model (C-GEM) was used to simulate the transient hydrodynamics, transport, and biogeochemis

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Austin, Timothy, Ana Vila-Concejo, Andrew Short, and Roshanka Ranasinghe. "A Multi-Scale Conceptual Model of Flood-Tide Delta Morphodynamics in Micro-Tidal Estuaries." Geosciences 8, no. 9 (2018): 324. http://dx.doi.org/10.3390/geosciences8090324.

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Wave and tide induced sediment transport pathways and rates govern the morphological evolution of estuarine systems. An understanding of the morphodynamics of these systems is required to maintain their commercial, biological and recreational value. The morphodynamics of Port Stephens estuary, a micro-tidal estuary located on a wave dominated southeast coast of Australia were investigated using bathymetric surveys and current velocity data from several locations over the estuary. This provided detailed insight into the rates and direction of movement for the main sedimentary features of the sy

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Le Vu, Hong, and Ron Johnstone. "Anthropogenic Impacts on Biochemical Processes in a Tropical Estuarine Lagoon." International Journal of Engineering Technology and Sciences 5, no. 2 (2018): 102–6. http://dx.doi.org/10.15282/ijets.v5i2.1401.

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Estuaries play an invaluable role in the transformation and cycling of materials as they move between land and sea; including anthropogenic materials. Increasingly, human land use is delivering material loads that risk overwhelming the normal functions that these ecosystems provide. In this context, the objective of this study is to assess key biogeochemical processes to understand the connections of anthropogenic activities on ecosystem performance in a tropical estuarine lagoon system. This research focuses on a case study area, Dong Ho lagoon in Vietnam, which exemplifies the anthropogenic

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Laruelle, Goulven Gildas, Nicolas Goossens, Sandra Arndt, Wei-Jun Cai, and Pierre Regnier. "Air–water CO<sub>2</sub> evasion from US East Coast estuaries." Biogeosciences 14, no. 9 (2017): 2441–68. http://dx.doi.org/10.5194/bg-14-2441-2017.

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Abstract. This study presents the first regional-scale assessment of estuarine CO2 evasion along the US East Coast (25–45° N). The focus is on 42 tidal estuaries, which together drain a catchment of 697 000 km2 or 76 % of the total area within this latitudinal band. The approach is based on the Carbon–Generic Estuary Model (C-GEM) that allows the simulation of hydrodynamics, transport, and biogeochemistry for a wide range of estuarine systems using readily available geometric parameters and global databases of seasonal climatic, hydraulic, and riverine biogeochemical information. Our simulatio

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Leuven, Jasper R. F. W., Sanja Selaković, and Maarten G. Kleinhans. "Morphology of bar-built estuaries: empirical relation between planform shape and depth distribution." Earth Surface Dynamics 6, no. 3 (2018): 763–78. http://dx.doi.org/10.5194/esurf-6-763-2018.

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Abstract. Fluvial–tidal transitions in estuaries are used as major shipping fairways and are characterised by complex bar and channel patterns with a large biodiversity. Habitat suitability assessment and the study of interactions between morphology and ecology therefore require bathymetric data. While imagery offers data of planform estuary dimensions, only for a few natural estuaries are bathymetries available. Here we study the empirical relation between along-channel planform geometry, obtained as the outline from imagery, and hypsometry, which characterises the distribution of along-chann

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Groeneveld, Johan C., Jorge Santos, Fiona MacKay, and Cosmas N. Munga. "A regional assessment of seasonal-to-decadal changes in estuarine socio-ecological systems in the Western Indian Ocean." Western Indian Ocean Journal of Marine Science, no. 1/2021 (December 23, 2021): 131–61. http://dx.doi.org/10.4314/wiojms.si2021.1.9.

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Estuarine socio-ecological systems (SES) in the Western Indian Ocean (WIO) region face mounting pressures from overexploitation, habitat degradation, impacts of climate change and governance inadequacies. A regional assessment of seasonal-to-decadal change in SES of three estuaries (Bons Sinais in Mozambique, Ruvu in Tanzania and Tana in Kenya) was undertaken along 2000 km of tropical coastline (3°-18°S), using a systems-oriented approach and information collected during the Estuarize-WIO project (2016-2019). All three estuaries were open and tidal, but differed along gradients of geomorpholog

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Carmona Rodrigues, A., M. Cardoso da Silva, A. Câmara, T. Faria Fernandes, and J. Gomes Ferreira. "Dispersion Modelling for a Complex Estuary – The Case of the Tagus." Water Science and Technology 20, no. 6-7 (1988): 271–76. http://dx.doi.org/10.2166/wst.1988.0212.

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Estuarine dispersion models have been commonly used to define the pollutant loads permissible to achieve pre-defined water quality levels and improve our knowledge of estuarine phenomena. Those models for large estuaries with complex hydrodynamic and ecological processes usually have extremely high running times. This paper presents an approach based on the use of increasingly complex models, which attempts to circumvent the problem of initial lack of data, as well as to give some initial insight into the processes of the Tagus Estuary, within acceptable levels of precision. As a first stage,

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Biswas, Debarghya, Ankita Tiwari, and Sushma Murlie. "The function of estuaries mixing zones in main productivity and nutrient flow of coastal waters." International Journal of Aquatic Research and Environmental Studies 5, no. 1 (2025): 538–47. https://doi.org/10.70102/ijares/v5i1/5-1-50.

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Estuaries are centers of primary production and nutrient conversion that enhance food webs and environmental functionality locally and in the surrounding environments. The depth-dependent nutrient conversion and main productivity processes in the water column and seafloor were examined, and the lateral flow of substances and materials through the estuary mouth was determined. As a case study, the impacts of Sea Level Rise (SLR) on production and nutrient changes were anticipated using an estuary characterized by shallower soft-sediment ecosystems. The estuary functioned as a net recipient of d

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Joesoef, Andrew, David L. Kirchman, Christopher K. Sommerfield, and Wei-Jun Cai. "Seasonal variability of the inorganic carbon system in a large coastal plain estuary." Biogeosciences 14, no. 21 (2017): 4949–63. http://dx.doi.org/10.5194/bg-14-4949-2017.

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Abstract. Carbonate geochemistry research in large estuarine systems is limited. More work is needed to understand how changes in land-use activity influence watershed export of organic and inorganic carbon, acids, and nutrients to the coastal ocean. To investigate the seasonal variation of the inorganic carbon system in the Delaware Estuary, one of the largest estuaries along the US east coast, dissolved inorganic carbon (DIC), total alkalinity (TA), and pH were measured along the estuary from June 2013 to April 2015. In addition, DIC, TA, and pH were periodically measured from March to Octob

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Lange, Xaver, and Hans Burchard. "The Relative Importance of Wind Straining and Gravitational Forcing in Driving Exchange Flows in Tidally Energetic Estuaries." Journal of Physical Oceanography 49, no. 3 (2019): 723–36. http://dx.doi.org/10.1175/jpo-d-18-0014.1.

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AbstractIn straight tidal estuaries, residual overturning circulation results mainly from a competition between gravitational forcing, wind forcing, and friction. To systematically investigate this for tidally energetic estuaries, the dynamics of estuarine cross sections is analyzed in terms of the relation between gravitational forcing, wind stress, and the strength of estuarine circulation. A system-dependent basic Wedderburn number is defined as the ratio between wind forcing and opposing gravitational forcing at which the estuarine circulation changes sign. An analytical steady-state solut

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Montagna, Paul. "How a Simple Question About Freshwater Inflow to Estuaries Shaped a Career." Gulf and Caribbean Research 32 (2021): ii—xiv. http://dx.doi.org/10.18785/gcr.3201.04.

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Chance and good luck led to a career studying how freshwater inflow drives estuary processes. In 1986, someone asked me: How much fresh water has to flow to a bay for it to be healthy? The question shaped my career. There is probably no better place on Earth to compare effects caused by inflow differences than the Texas coast, because the major estuarine systems lie in a climatic gradient where runoff decreases 56—fold from the Louisiana border in the northeast to the Mexico border in the southwest. This estuary—comparison experiment was used to study inflow effects. The science evolved from t

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Volta, C., G. G. Laruelle, S. Arndt, and P. Regnier. "Linking biogeochemistry to hydro-geometrical variability in tidal estuaries: a generic modeling approach." Hydrology and Earth System Sciences Discussions 12, no. 7 (2015): 6351–435. http://dx.doi.org/10.5194/hessd-12-6351-2015.

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Abstract. This study applies the Carbon-Generic Estuary Model (C-GEM) modeling platform to simulate the estuarine biogeochemical dynamics – in particular the air-water CO2 exchange – in three idealized end-member systems covering the main features of tidal alluvial estuaries. C-GEM uses a generic biogeochemical reaction network and a unique set of model parameters extracted from a comprehensive literature survey to perform steady-state simulations representing average conditions for temperate estuaries worldwide. Climate and boundary conditions are extracted from published global databases (e.

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Hodgkin, Ernest P., and Patrick Hesp. "Estuaries to salt lakes: Holocene transformation of the estuarine ecosystems of south-western Australia." Marine and Freshwater Research 49, no. 3 (1998): 183. http://dx.doi.org/10.1071/mf96109.

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When the estuaries of south-western Australia were first flooded by the Holocene marine transgression about 7000 years before present (BP), most were enclosed by limestone barrier dunes. Coastal sand drift built bars and flood-tide deltas in the narrow entrances, but until about 3500 years BP the estuaries remained tidal-dominated systems with a diverse marine–estuarine fauna. Now the bars/deltas so obstruct the small tides that estuary water is fresh in winter and marine to hypersaline in summer; the estuaries are river-flow-dominated systems and the ecosystems are characterised by a restrict

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Hu, Wang, Yao, and Jin. "A Case Study: Response Mechanics of Irregular Rotational Tidal Flows to Outlet Regulation in Yangtze Estuary." Water 11, no. 7 (2019): 1445. http://dx.doi.org/10.3390/w11071445.

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Responses of irregular rotational tidal flows to an outlet regulation (the Guyuan Sand (GYS) regulation) in the three-level branching Yangtze Estuary are studied by a high-resolution numerical model and theoretical analysis. The project is launched around GYS at the outlet of the North Branch of the Yangtze Estuary. The tidal flows around GYS are rotational and become irregular under the influences of the runoff-tide interactions, rapidly varying topographies and complex solid boundaries in coastal areas. Three designs of GYS regulation were studied, including various diversion dikes and new o

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Volta, C., S. Arndt, H. H. G. Savenije, G. G. Laruelle, and P. Regnier. "C-GEM (v 1.0): a new, cost-efficient biogeochemical model for estuaries and its application to a funnel-shaped system." Geoscientific Model Development 7, no. 4 (2014): 1271–95. http://dx.doi.org/10.5194/gmd-7-1271-2014.

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Abstract. Reactive transport models (RTMs) are powerful tools for disentangling the complex process interplay that drives estuarine biogeochemical dynamics, for assessing the quantitative role of estuaries in global biogeochemical cycles and for predicting their response to anthropogenic disturbances (land-use change, climate change and water management). Nevertheless, the application of RTMs for a regional or global estimation of estuarine biogeochemical transformations and fluxes is generally compromised by their high computational and data demands. Here, we describe C-GEM (Carbon-Generic Es

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Volta, C., S. Arndt, H. H. G. Savenije, G. G. Laruelle, and P. Regnier. "C-GEM (v 1.0): a new, cost-efficient biogeochemical model for estuaries and its application to a funnel-shaped system." Geoscientific Model Development Discussions 6, no. 4 (2013): 5645–709. http://dx.doi.org/10.5194/gmdd-6-5645-2013.

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Abstract. The first part of this paper describes C-GEM (Carbon – Generic Estuary Model), a new, one-dimensional, generic reactive-transport model for the biogeochemical dynamics of carbon and associated bio-elements (N, P, Si) in estuaries. C-GEM is computationally efficient and reduces data-requirements by using an idealized representation of the estuarine geometry to quantitatively predict the dominant features of the estuarine hydrodynamics, salt transport and biogeochemistry. A protocol for the set-up of C-GEM for an estuarine system is also described. The second part of this paper present

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Seriani, Robson, Lucas Buruaem Moreira, Denis Moledo de Souza Abessa, et al. "Hematological analysis of Micropogonias Furnieri, Desmarest, 1823, Scianidae, from two estuaries of Baixada Santista, São paulo Brazil." Brazilian Journal of Oceanography 58, spe3 (2010): 87–92. http://dx.doi.org/10.1590/s1679-87592010000700011.

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Hematological alterations in fish are considered a useful tool to evaluate pathological processes resulting from the exposure to environmental pollutants. The whitemouth croaker Micropogonias furnieri is a common species in estuarine areas and potentially exposed to many contaminants. In the present study, the hematological characteristics of fish collected at two sites in Baixada Santista (Santos Estuarine System - SES, a polluted site; and the Estuary of Itanhaém River - EIR, unpolluted site) del was analysed. The following blood descriptors were analyzed: number of Erythrocytes (Er), Hemato

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Burchard, Hans. "A Universal Law of Estuarine Mixing." Journal of Physical Oceanography 50, no. 1 (2020): 81–93. http://dx.doi.org/10.1175/jpo-d-19-0014.1.

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AbstractA universal law of estuarine mixing is derived here, combining the approaches of salinity coordinates, Knudsen relations, total exchange flow, mixing definition as salinity variance loss, and the mixing–exchange flow relation. As a result, the long-term average mixing within an estuarine volume bounded by the isohaline of salinity S amounts to M(S) = S2Qr, where Qr is the average river runoff into the estuary. Consequently, the mixing per salinity class is m(S) = ∂SM(S) = 2SQr, which can also be expressed as the product of the isohaline volume and the mixing averaged over the isohaline

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Silva, Janaina Barbosa da, Josiclêda Domiciano Galvíncio, Antonio Carlos De Barros Corrêa, Danielle Gomes da Silva, and Célia Cristina Clemente Machado. "Classificação Geomorfológica dos Estuários do Estado de Pernambuco (Brasil) com Base em Imagens do LANDSAT 5/TM (Geomorphologic Classification of Estuaries of the State of Pernambuco (Brazil) Based on Landsat 5 TM Images)." Revista Brasileira de Geografia Física 4, no. 1 (2011): 118. http://dx.doi.org/10.26848/rbgf.v4i1.232689.

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O presente estudo visou classificar os quinze estuários do Estado de Pernambuco, adotando como base as características geomorfológicas. A base de dados utilizada para a classificação foram imagens de satélites do Landsat 5-TM. Foram realizadas análises visuais das imagens de satélite e posteriormente efetuados trabalhos de campo com o intuito de validar as interpretações realizadas. Na zona costeira pernambucana os estuários classificam-se como: Planície Costeira (vale inundado), Formado por Barras e por Outros Processos. As interações espaço-temporal dos processos ambientais durante o Quatern

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Schulz, Gesa, Tina Sanders, Yoana G. Voynova, Hermann W. Bange, and Kirstin Dähnke. "Seasonal variability of nitrous oxide concentrations and emissions in a temperate estuary." Biogeosciences 20, no. 15 (2023): 3229–47. http://dx.doi.org/10.5194/bg-20-3229-2023.

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Abstract. Nitrous oxide (N2O) is a greenhouse gas, with a global warming potential 298 times that of carbon dioxide. Estuaries can be sources of N2O, but their emission estimates have significant uncertainties due to limited data availability and high spatiotemporal variability. We investigated the spatial and seasonal variability of dissolved N2O and its emissions along the Elbe Estuary (Germany), a well-mixed temperate estuary with high nutrient loading from agriculture. During nine research cruises performed between 2017 and 2022, we measured dissolved N2O concentrations, as well as dissolv

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Wang, Chongyang, Li Wang, Danni Wang, et al. "Turbidity maximum zone index: a novel model for remote extraction of the turbidity maximum zone in different estuaries." Geoscientific Model Development 14, no. 11 (2021): 6833–46. http://dx.doi.org/10.5194/gmd-14-6833-2021.

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Abstract. An efficient recognition and extraction of the estuarine turbidity maximum zone (TMZ) is important for studying terrestrial hydrological processes. Although many studies relevant to the TMZ have been conducted worldwide, the extraction methods and criteria used to describe the TMZ vary significantly both spatially and temporally. To improve the applicability of the methods adopted in previous studies and to develop a novel model to accurately extract the TMZ in multiple estuaries and different seasons from remote-sensing imageries, this study estimated the total suspended solid (TSS)

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Youm, Cheikh Ibrahima, Adama Gueye, Elena García-Villalba, et al. "Lithofacies and Sediment Sequences of a Microtidal, Wave-Dominated Tropical Estuary in Somone Lagoon (Senegal, West Africa)." Coasts 4, no. 2 (2024): 306–22. http://dx.doi.org/10.3390/coasts4020016.

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Estuary sedimentary sequences have been the focus of several papers in the last decades; however, the majority these papers were centered in mesotidal and macrotidal estuaries of the middle latitudes. This present paper studies, from a sedimentological point of view, the infilling of a microtidal, wave-dominated tropical estuary, where wide tidal flats, mangroves and sabkhas are developed. Somone Lagoon is a Senegalese protected environment, very rich from an ecological point of view and with a definitive touristic vocation. For this work, 14 piston cores were studied. Additionally, the grain

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Hughes, Brent B., Kerstin Wasson, M. Tim Tinker, et al. "Species recovery and recolonization of past habitats: lessons for science and conservation from sea otters in estuaries." PeerJ 7 (December 10, 2019): e8100. http://dx.doi.org/10.7717/peerj.8100.

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Recovering species are often limited to much smaller areas than they historically occupied. Conservation planning for the recovering species is often based on this limited range, which may simply be an artifact of where the surviving population persisted. Southern sea otters (Enhydra lutris nereis) were hunted nearly to extinction but recovered from a small remnant population on a remote stretch of the California outer coast, where most of their recovery has occurred. However, studies of recently-recolonized estuaries have revealed that estuaries can provide southern sea otters with high quali

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Cheong, Amanda Y. L., Kogila Vani Annammala, Ee Ling Yong, Yongli Zhou, Robert S. Nichols, and Patrick Martin. "Distribution of nutrients and dissolved organic matter in a eutrophic equatorial estuary: the Johor River and the East Johor Strait." Biogeosciences 21, no. 12 (2024): 2955–71. http://dx.doi.org/10.5194/bg-21-2955-2024.

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Abstract. Estuaries have strong physicochemical gradients that lead to complex variability and often high rates of biogeochemical processes, and they are also often impacted by humans. Yet, our understanding of estuarine biogeochemistry remains skewed towards temperate latitudes. We examined seasonal and spatial variability in dissolved organic matter (DOM) and nutrients along a partly eutrophic, agricultural–urban estuary system in Southeast Asia: the Johor River and the East Johor Strait. Dissolved organic carbon (DOC) and coloured DOM (CDOM) showed non-conservative mixing, indicating signif

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Zhu, Lei, Jiangchuan Sheng, and Liwen Pang. "The Role of Tide and Wind in Modulating Density Stratification in the Pearl River Estuary during the Dry Season." Journal of Marine Science and Engineering 12, no. 8 (2024): 1241. http://dx.doi.org/10.3390/jmse12081241.

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Density stratification plays a crucial role in estuarine hydrodynamics and material transport. In this study, we utilized a well-calibrated numerical model to investigate the stratification processes and underlying mechanisms in the dynamically wide Pearl River Estuary (PRE). In the upper estuary, longitudinal straining governs stratification, enhancing it during ebb tide and reducing it during flood tide. The Coriolis force becomes significant in the lower estuary due to the increased basin width, causing seaward freshwater to be confined to the West Shoal, where a pronounced transverse salin

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Macovei, Vlad A., Louise C. V. Rewrie, Rüdiger Röttgers, and Yoana G. Voynova. "Spring–neap tidal cycles modulate the strength of the carbon source at the estuary–coast interface." Biogeosciences 22, no. 13 (2025): 3375–96. https://doi.org/10.5194/bg-22-3375-2025.

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Abstract. Estuaries are dynamic environments with large biogeochemical variability modulated by tides, linking land to the coastal ocean. The carbon cycle at the land–sea interface can be better constrained by increasing the frequency of observations and by identifying the influence of tides with respect to the spring–neap variability. Here, we use FerryBox measurements from a ship of opportunity travelling between two large temperate estuaries in the North Sea and find that the spring–neap tidal cycle drives a large percentage of the biogeochemical variability, in particular in inorganic and

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Gallop, Shari L., Karin R. Bryan, David P. Hamilton, Melissa Foley, and John L. Largier. "ECOENGINEERING FRESHWATER FLOWS FOR ESTUARY HYDROLOGICAL STATE." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 17. http://dx.doi.org/10.9753/icce.v37.management.17.

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The quantity, quality and timing of freshwater inflow into estuaries is critical to support estuarine ecosystem health. However, most estuaries are affected by upstream manipulation of freshwater inflows. Coinciding with the United Nations Decade of Restoration (2021–2030), there is great interest in re-creating functional estuarine ecosystems, including by modifying the physio-chemical characteristics with the premise that a functional ecosystem will follow (ecoengineering). To restore estuarine ecology, the physical processes of the system must first be conductive to supporting the re-establ

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Lokhorst, Ivar R., Lisanne Braat, Jasper R. F. W. Leuven, et al. "Morphological effects of vegetation on the tidal–fluvial transition in Holocene estuaries." Earth Surface Dynamics 6, no. 4 (2018): 883–901. http://dx.doi.org/10.5194/esurf-6-883-2018.

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Abstract. Vegetation enhances bank stability and sedimentation to such an extent that it can modify river patterns, but how these processes manifest themselves in full-scale estuarine settings is poorly understood. On the one hand, tidal flats accrete faster in the presence of vegetation, reducing the flood storage and ebb dominance over time. On the other hand flow-focusing effects of a tidal floodplain elevated by mud and vegetation could lead to channel concentration and incision. Here we study isolated and combined effects of mud and tidal marsh vegetation on estuary dimensions. A 2-D hydr

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Keeley, Annika T. H., Alexander K. Fremier, Pascale A. L. Goertler, et al. "Governing Ecological Connectivity in Cross-Scale Dependent Systems." BioScience 72, no. 4 (2022): 372–86. http://dx.doi.org/10.1093/biosci/biab140.

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Abstract Ecosystem management and governance of cross-scale dependent systems require integrating knowledge about ecological connectivity in its multiple forms and scales. Although scientists, managers, and policymakers are increasingly recognizing the importance of connectivity, governmental organizations may not be currently equipped to manage ecosystems with strong cross-boundary dependencies. Managing the different aspects of connectivity requires building social connectivity to increase the flow of information, as well as the capacity to coordinate planning, funding, and actions among bot

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Yin, Xiao Ling, Dong Lin Bai, and Li Cheng Li. "The Response of Salinity in Dry Season to Vertical Circulation in the Modaomen Estuary of the Pearl River, China." Advanced Materials Research 518-523 (May 2012): 4574–77. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.4574.

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In recent years, salt intrusion in estuaries of the Pearl River has become a serious problem for local water supply in dry season. Water level, circulation and salinity around mouth of the Modaomen estuary in spring and neap were examined respectively through field measurements. The results indicated that mild water level process reinforced baroclinic action to cause notable circulation downstream, which was more durable in neap. And, the current in lower layer was generally faster than that in upper layer during the neap circulation. These two probably resulted in higher bottom salinity in ne

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Hewageegana, Viyaktha Hithaishi, Maitane Olabarrieta, and Jose M. Gonzalez-Ondina. "Main Physical Processes Affecting the Residence Times of a Micro-Tidal Estuary." Journal of Marine Science and Engineering 11, no. 7 (2023): 1333. http://dx.doi.org/10.3390/jmse11071333.

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Residence time is an important parameter linked to the water quality in an estuary. In this paper, we identify and analyze the main processes that affect the residence time of the Caloosahatchee River Estuary, a micro-tidal and mixed diurnal-semidiurnal estuary located in western Florida. Multiyear validated hydrodynamic hindcast results were coupled with an offline particle tracking model to compute the residence time of the estuary, which showed a strong seasonality driven by the river discharge. The residence time reduced with increasing river flow. The wind velocity and direction also affe

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Hwan Hwang, Jin, Dong Hyeon Kim, and Bo-Kyung Kim. "Advanced flow simulations of estuarine water resources responding to changes in societal demands." IOP Conference Series: Earth and Environmental Science 1313, no. 1 (2024): 012015. http://dx.doi.org/10.1088/1755-1315/1313/1/012015.

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Abstract Water resources of rivers and estuaries have traditionally been managed for local societal demands, including municipal, agricultural, and industrial usages, as well as for transportation as navigational channels. However, as societal demands have changed including urban expansion, economic growth, cultural transition, etc., the land uses also should be changed, and the civil necessities of water have been diversified, and this has raised concerns about the ecology, environment, and water quality issues. This study attempted to address three water resource management issues in South K

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Bruce, L. C., P. L. M. Cook, I. Teakle, and M. R. Hipsey. "Controls on oxygen dynamics in a riverine salt-wedge estuary – a three-dimensional model of the Yarra River estuary, Australia." Hydrology and Earth System Sciences Discussions 10, no. 7 (2013): 9799–845. http://dx.doi.org/10.5194/hessd-10-9799-2013.

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Abstract. Oxygen depletion in estuarine waters is an important factor governing water quality and ecological health. A complex and dynamic balance of physical and biogeochemical factors drive the extent and persistence of hypoxia and anoxia making it difficult to predict. An increased understanding of the effect of changing flow regimes and temperature on patterns of estuarine oxygen depletion is required to support ongoing management. Coupled physical and biogeochemical models have been applied to study the interaction of physical processes and seasonal hypoxia, however, application to riveri

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Hu, Dechao, Zhanfeng Cui, Xin Zeng, Jianyin Zhou, and Yuan Yuan. "Engineering Regulation of the Weird Branches in a Branching Estuary and its Mechanics: Using the North Branch of the Yangtze Estuary as an Example." Water 16, no. 16 (2024): 2260. http://dx.doi.org/10.3390/w16162260.

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Weird horizontal shapes of branches, in large branching estuaries, often cause significant flood risks and environment-related problems. People usually resort to engineering methods to improve the horizontal shape of the weird branches and solve related issues. The responses of the riverbed evolution of a branching estuary to anthropogenic activity are complicated because of complex estuarine hydrodynamics and sediment transports, especially when the project locates specially (e.g., at estuary outlets). The North Branch of the Yangtze Estuary has a narrow upper reach which is almost orthogonal

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Mendes, Joana, Rui Ruela, Ana Picado, et al. "Modeling Dynamic Processes of Mondego Estuary and Óbidos Lagoon Using Delft3D." Journal of Marine Science and Engineering 9, no. 1 (2021): 91. http://dx.doi.org/10.3390/jmse9010091.

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Estuarine systems currently face increasing pressure due to population growth, rapid economic development, and the effect of climate change, which threatens the deterioration of their water quality. This study uses an open-source model of high transferability (Delft3D), to investigate the physics and water quality dynamics, spatial variability, and interrelation of two estuarine systems of the Portuguese west coast: Mondego Estuary and Óbidos Lagoon. In this context, the Delft3D was successfully implemented and validated for both systems through model-observation comparisons and further explor

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Hsieh, Tung-Chou, Yan Ding, Keh-Chia Yeh, and Ren-Kai Jhong. "Investigation of Morphological Changes in the Tamsui River Estuary Using an Integrated Coastal and Estuarine Processes Model." Water 12, no. 4 (2020): 1084. http://dx.doi.org/10.3390/w12041084.

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This study is to investigate morphological changes in the Tamsui River Estuary in Taiwan driven by multiple physical processes, such as river flows, tides, waves, and storm surges, and then to study the impacts of sediment flushing operated at the Shihmen reservoir upstream on the river estuary. An integrated coastal and estuarine processes model (CCHE2D-Coast) (Center for Computational Hydroscience and Engineering Two-Dimensional-Coast) was validated by simulating these physical processes in the estuary driven by three historical typhoons in 2008. The site-specifically validated model was the

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Dähnke, Kirstin, Tina Sanders, Yoana Voynova, and Scott D. Wankel. "Nitrogen isotopes reveal a particulate-matter-driven biogeochemical reactor in a temperate estuary." Biogeosciences 19, no. 24 (2022): 5879–91. http://dx.doi.org/10.5194/bg-19-5879-2022.

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Abstract. Estuaries and rivers are important biogeochemical reactors that act to modify the loads and composition of nutrients in the coastal zone. In a case study during July 2013, we sampled an 80 km transect along the Elbe Estuary under low-oxygen conditions. To better elucidate specific mechanisms of estuarine nitrogen processing, we tracked the evolution of the stable isotopic composition of nitrate, nitrite, particulate matter, and ammonium through the water column. This approach allowed assessment of the in situ isotope effects of ammonium and nitrite oxidation and of remineralization a

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Silva, Alex Evaristo da, Pedro Smith Menandro, Kleverson Alencastre Do Nascimento, Valéria Da S. Quaresma, and Alex C. Bastos. "INTERPRETATION OF SEDIMENTARY PROCESSES USING ECHO-CHARACTER DISTRIBUTION: CASE STUDY OF PIRAQUÊ-AÇU AND PIRAQUÊ-MIRIM ESTUARINE SYSTEM, ARACRUZ – ES (BRAZIL)." Revista Brasileira de Geofísica 32, no. 2 (2014): 301. http://dx.doi.org/10.22564/rbgf.v32i2.484.

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ABSTRACT. This research aimed to map distinct types of echo-character in order to recognize estuarine sedimentary processes along the Piraquê-Açu System, in Aracruz, Espírito Santo State, Brazil. Echo-character mapping was undertaken using high frequency sub-bottom profiling data. Four echo-character (EC1, EC2, EC3,EC4) patterns were recognized by combining sub-bottom and surficial sedimentological data. These EC patterns defined three distinct areas within the system that arecharacterized by the predominance of a specific echo-character and a seabed type: i) estuarine mouth, where sand beds w

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