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Academic literature on the topic 'Estuaries'

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Published: 4 June 2021
Last updated: 29 July 2024

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Journal articles on the topic "Estuaries"

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Shin, Hyun-Jung, Guan-hong Lee, KiRyong Kang, and Kyeong Park. "Shift of estuarine type in altered estuaries." Anthropocene Coasts 2, no. 1 (January 1, 2019): 145–70. http://dx.doi.org/10.1139/anc-2018-0013.

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To better understand the alteration of the estuarine circulation caused by estuarine dams, four major Korean estuaries were classified by using the Hansen and Rattray stratification–circulation classification scheme. The stratification and circulation parameters were calculated for both discharge and no-discharge periods from the tidally averaged salinity and velocity data obtained from these four Korean estuaries. The estuarine types of the altered Korean estuaries were compared with the previous results for natural estuaries in other countries of similar magnitude in tidal range, water depth, and discharge. This comparison revealed that the estuarine types of the altered Korean estuaries have been shifted from a partially mixed to a well-mixed type (Nakdong River Estuary), from a partially mixed to a coastal bay or a fjord type (Yeongsan River Estuary), and from a well-mixed to a well-mixed type with less tidal modulation (Geum River Estuary). The controlling factors that determined the type in natural estuaries were tide, discharge, and water depth, whereas for altered estuaries, they were the controlled river discharge and water depth. The different estuarine dam gate types with their different modes of operation (surface or bottom discharge) played an important role in the mixing and circulation of the altered estuaries.
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Ketchum, Bostwick H. "CIRCULATION IN ESTUARIES." Coastal Engineering Proceedings 1, no. 3 (January 1, 2000): 6. http://dx.doi.org/10.9753/icce.v3.6.

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In discussing the circulation in estuaries, an apparent paradox must always be kept in mind. In the first place the problems of estuarine circulation are unique, being different from the problems of the open sea, and from the problems of river hydrology. Estuarine circulation and related problems consequently constitute a valid field for investigation. In contrast to this viewpoint is the tremendous range of conditions found in various estuaries - no two are alike. This inherent variability of estuaries discourages generalizations about the circulation.
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Gillanders, Bronwyn M., Travis S. Elsdon, Ian A. Halliday, Gregory P. Jenkins, Julie B. Robins, and Fiona J. Valesini. "Potential effects of climate change on Australian estuaries and fish utilising estuaries: a review." Marine and Freshwater Research 62, no. 9 (2011): 1115. http://dx.doi.org/10.1071/mf11047.

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Estuaries are especially vulnerable to the impacts of climate change because changes in climatic and hydrologic variables that influence freshwater and marine systems will also affect estuaries. We review potential impacts of climate change on Australian estuaries and their fish. Geographic differences are likely because southern Australian climates are predicted to become warmer and drier, whereas northern regions may see increased precipitation. Environmental factors, including salinity gradients, suspended sediment, dissolved oxygen and nutrient concentrations, will be influenced by changing freshwater input and other climate variables. Potential impacts will vary depending on the geomorphology of the estuary and the level of build-up of sand bars across estuarine entrances. Changes to estuarine fish assemblages will depend on associated changes to salinity and estuarine-mouth morphology. Marine migrants may be severely affected by closure of estuarine mouths, depending on whether species ‘must’ use estuarine habitat and the level of migratory v. resident individuals. Depending on how fish in coastal waters locate estuaries, there may be reduced cues associated with estuarine mouths, particularly in southern Australia, potentially influencing abundance. In summary, climate change is expected to have major consequences for Australian estuaries and associated fish, although the nature of impacts will show significant regional variation.
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Groeneveld, Johan C., Antonio M. Hoguane, Baraka Kuguru, Fiona Mackay, Cosmas Munga, and Jorge Santos. "Estuarize-WIO: A socio-ecological assessment of small-scale fisheries in estuaries of the Western Indian Ocean." Western Indian Ocean Journal of Marine Science, no. 1/2021 (December 23, 2021): 1–15. http://dx.doi.org/10.4314/wiojms.si2021.1.1.

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Estuaries provide unique ecosystem goods and services and have been focal points for human settlement andresource use throughout recorded history. In the Western Indian Ocean (WIO) region, the effects of human population growth, rapid economic development and climate change on estuaries threaten their ecological functioning and the sustainability of estuary-dependent livelihoods. Governance systems are ill-equipped to deal with the mounting challenges. Long-term datasets that describe estuary-scale trends are scarce, and socio-ecological interactions that support sustainable use of resources are incompletely understood. To address these gaps, the Estuarize-WIO project (2016-2019) compiled datasets on biophysical, ecological, socio-economic and fisheries aspects of selected estuaries in Mozambique (Bons Sinais), Tanzania (Ruvu) and Kenya (Tana), analysed trends per estuary, and used a socio-ecological systems (SES) framework to integrate information from multiple sources at local and regional levels. The introductory paper of this Special Issue of the Western Indian Ocean Journal of Marine Science provides regional context and reviews the relevant literature available for WIO estuaries. In succeeding papers, estuarine circulation is inferred from hydrological measurements, seasonal and decadal trends in land cover and land use are investigated using remote sensing images, household surveys are used to investigate socio-economic circumstances and resource use, and long-term catch survey data and field samples are used to describe small-scale fisheries. In the synthesis paper, a SES framework is constructed to investigate linkages and feedback loops in individual estuaries. A regionally comparative analysis across the WIO region was conducted, and recommendations were made for future research and governance. The methodological approach developed for Estuarize-WIO is well-suited to research of data poor systems with limited accessibility and research infrastructure.
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Taddese, Fasil, Marc Schallenberg, Pavel Mikheev, Matt G. Jarvis, and Gerard P. Closs. "Ichthyofaunal assemblages in shallow littoral habitats of permanently open estuaries and intermittently closed and open lakes or lagoons in Otago, New Zealand." Marine and Freshwater Research 69, no. 8 (2018): 1222. http://dx.doi.org/10.1071/mf17334.

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Fish assemblages of New Zealand estuaries are poorly studied, and knowledge of the effects of estuary–ocean connections on the ichthyofaunal composition of estuaries remains limited. Understanding the status of fish composition of estuaries is crucial for planning for sustainable management of aquatic ecosystems. In the present study we sampled fish using a seine net from lower reaches of six permanently open estuaries and six intermittently closed and open lakes or lagoons (ICOLLs) along the Otago coastline during winter 2016 and summer 2017. Marked differences in ichthyofaunal composition were observed in the shallow littoral habitats of permanently open estuaries and ICOLLs. Fish assemblages reflected estuary–ocean connection status of estuaries during both seasons. ICOLLs showed greater fish abundance than permanently open systems. Fish abundance was higher in summer than in winter in both estuary types. Fish species with marine–estuarine opportunist and estuarine–migrant life histories dominated permanently open estuaries. Conversely, species with a diadromous life history but known to form landlocked populations were abundant in ICOLLs. Salinity and temperature were correlated with fish abundance in both estuary types.
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Slinger, J. H., and C. M. Breen. "Integrated research into estuarine management." Water Science and Technology 32, no. 5-6 (September 1, 1995): 79–86. http://dx.doi.org/10.2166/wst.1995.0566.

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Estuaries are under increasing pressure owing to agricultural, urban and industrial developments in their catchments and their status as favoured sites for coastal development and recreation. Effective research on South Africa estuaries requires the synthesis of available scientific knowledge to efficiently address management concerns and so ensure the sustainable utilisation of estuaries. The approach of the Consortium for Estuarine Research and Management to these problems and the results of a co-ordinated research programme on decision support for the management and conservation of estuarine systems are described in this paper. While the importance and current status of South African estuaries are considered, attention is devoted primarily to the development of an integrated modelling approach to the freshwater requirements of estuaries. In particular, the application of a linked system of five models to a case study, the Great Brak Estuary is described and the role of prediction in promoting wise decision making for estuaries is treated.
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O'Mara, K., A. Miskiewicz, and M. Y. L. Wong. "Estuarine characteristics, water quality and heavy metal contamination as determinants of fish species composition in intermittently open estuaries." Marine and Freshwater Research 68, no. 5 (2017): 941. http://dx.doi.org/10.1071/mf15409.

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Estuaries are critical aquatic environments that are used by many fish during their life cycle. However, estuaries often suffer from poor water quality as a result of anthropogenic activities. Fish diversity studies in estuaries are common, although few have examined whether correlations exist between water quality, metal contamination and fish assemblages. In the present study we investigated the effect of abiotic conditions, heavy metals and estuary characteristics on the abundance, diversity and composition of fish in four intermittently open estuaries along the Illawarra coast of south-eastern Australia. The heterogeneity of environmental conditions was reflected in the fish assemblages in each estuary. Environmental variables predicted fish species composition, and estuaries in particularly poor condition contained few species (estuarine residents) in high abundance, indicating their ability to acclimatise and survive in conditions that are hostile to other species. Overall, these findings demonstrate that estuarine fish assemblages may be useful indicators of estuary condition and reveal the importance of managing anthropogenic activities in the surrounding catchment to improve water quality so that biodiversity of fish can be restored in these estuarine environments.
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Veldkornet, D. A., J. B. Adams, J. S. Boatwright, and A. Rajkaran. "Barcoding of estuarine macrophytes and phylogenetic diversity of estuaries along the South African coastline." Genome 62, no. 9 (September 2019): 585–95. http://dx.doi.org/10.1139/gen-2018-0067.

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Plant DNA barcoding serves as an effective approach to building community phylogenies and increasing our understanding of the factors that determine plant community assemblages. The aims of the study were to (i) barcode macrophytes with high estuarine fidelity and (ii) to determine the phylogenetic diversity (PD) of selected South African estuaries for conservation prioritisation. Three DNA barcoding gene regions (rbcLa, matK, and trnH-psbA) were assessed, and community phylogenies were constructed for 270 estuaries. Generally, the matK barcode had the greatest discrimination success rate of 67.4% (parsimony informative sites = 418). Closely related species formed clades that also represent estuarine habitat types. Estuaries with high phylogenetic diversity along the southeast coast were associated with a combination of mangrove and salt marsh habitats. Species richness was strongly and significantly correlated with PD (r = 0.93; p < 0.000). Based on mean pairwise distance (MPD), more temperate estuaries (56) showed significant phylogenetic clustering compared to subtropical estuaries (24) (p < 0.05). Similarly, based on mean nearest taxon distance (MNTD), significant phylogenetic clustering was highest in temperate estuaries (50) compared to subtropical estuaries (12) (p < 0.05). This suggests that the coexistence of plant species in estuaries is structured by both biotic and abiotic interactions.
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Kisten, Yanasivan, Nadine A. Strydom, Renzo Perissinotto, and Sourav Paul. "Modelling the occurrence of postflexion stages of a marine estuarine-dependent fish in temperate South African estuaries." Scientia Marina 81, no. 1 (March 27, 2017): 27. http://dx.doi.org/10.3989/scimar.04521.05a.

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The movement of postflexion larvae of marine estuarine-dependent species into estuaries is critical for the survival of fishes reliant on estuaries as nurseries. However, detailed studies focused on environmental variability experienced by postflexion larvae entering a range of estuary types under varying conditions are rare. This study assessed the in situ conditions (temperature, salinity and water clarity) under which the southern African endemic fish Rhabdosargus holubi (Sparidae) recruits into estuaries. Postflexion larvae were sampled in three biogeographic regions (cool temperate, warm temperate and subtropical boundary), which included three estuary types (permanently open estuaries (POEs), temporarily open/closed estuaries and estuarine lake systems) on a seasonal basis, independent of each other. Rhabdosargus holubi larvae were more abundant in spring and summer, in POEs in the warm temperate region. Models predicted that higher larval occurrence in estuaries is a function of lower salinity (e.g. mesohaline zones of 5-17.9 salinity) and lower water clarity (e.g. 0-0.2 Kd, light extinction coefficient), particularly for warm, temperate POEs. This re-emphasizes the importance of freshwater for optimal nursery functioning, which may be compromised by impoundments, abstraction and climate change in water-short countries like South Africa.
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Kim, Jun-Wan, Kyu-Jin Kim, Beom-Myeong Choi, Kyung-Lak Lee, Min-Ho Jang, and Ju-Duk Yoon. "The Application of a Fish-Based Multi-Metric Index for the Assessment of Ecological Qualities of Estuaries in the Korean Peninsula." Sustainability 14, no. 18 (September 15, 2022): 11608. http://dx.doi.org/10.3390/su141811608.

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Brackish water zones are areas with high ecological conservation value. In this study, 325 river estuaries in the Korean peninsula in individual sea areas (West Sea, South Sea, and East Sea) were divided into types of estuaries (upstream and downstream of open estuaries, closed estuaries) through the assessment of the health of the estuary aquatic ecosystems and fish communities were identified. An ecological assessment was carried out using the Korea Estuary Fish Assessment Index (KEFAI). The number of species increased as the size of the river increased in the case of small estuaries but gradually decreased in the case of large estuaries. In the closed estuaries, the relative abundances (RAs) of primary freshwater fish were the highest; however, in the open estuaries, the RAs of estuary fish were the highest. Non-metric dimensional analysis results suggested that there was a clear difference between the fish assemblages in the closed and open estuaries. The overall results of this study were that the RA of tolerant species was higher, and KEFAI was lower in closed estuaries than in open estuaries, indicating the negative effects of the construction of transverse structures on fish assemblages. The health of these estuarine ecosystems can be improved by addressing these negative effects.
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Dissertations / Theses on the topic "Estuaries"

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Young, Ruth Anne. "Biotic Responses to Urbanisation in Mangrove Dominated Estuaries." Thesis, Griffith University, 2009. http://hdl.handle.net/10072/367651.

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Increasing urbanisation of coastal areas is placing unprecedented pressure on estuarine environments. Impacts associated with urbanisation can alter the health of estuarine ecosystems, reducing their capacity to provide valuable ecosystem services. In order protect these environments, relationships between estuarine health and urbanisation should be understood and applied to sustainable urban planning in coastal areas. Responses measured in estuarine biota offer much potential for providing pragmatic and sensitive means for the detection of urban impacts in estuaries. I assessed the responses of estuarine biota to increasing levels of urbanisation in the rapidly developing coastal region of southeast Queensland, Australia. I measured a suite of biotic indicators, namely: the δ15N of mangroves and crabs as a tracer for urban N sources, sediment chlorophyll a concentration (Chl a) as an estimate of the biomass of microphytobenthos (MPB), and a condition index in crabs, measured as the hepatosomatic index (HI). Urbanisation was estimated as the percentage of catchment covered by impervious surfaces (impervious cover, IC). Increases in impervious surfaces such as roads, footpaths and car parks are closely linked to urbanisation. These surfaces concentrate and convey pollutants generated from urban activities into coastal waterways and estuaries, thus making IC a useful indicator of urban impact.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
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Kaselowski, Tanja. "Physico-chemical and microalgal characteristics of the Goukamma Estuary." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1011130.

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Estuaries are intrinsically complex and dynamic ecosystems that display marked spatial and temporal variability. Because estuaries are situated at the receiving end of catchment activities, they are at particular risk of alterations to their natural complexity. The overarching objective of this study was to gain an overview of the abiotic conditions and biotic response of the Goukamma Estuary, a small temporarily open/closed estuary (TOCE) which is situated in a relatively undisturbed catchment in the Southern Cape. Physico-chemical properties drive estuarine ecology, and together with biological indicators, are commonly assessed to determine the present status of an estuary. During the study, physico-chemical parameters reflected great spatial and temporal variability in response to the mouth state over a 13 month period. Parameters ranged within expected limits, as proposed by the conceptual model for water quality of TOCE’s (Snow and Taljaard 2007). Of particular importance was the prominent occurrence of salinity stratification and hypoxic conditions (dissolved oxygen [DO] < 3 mg l-1) during both open and closed mouth states. Data indicated that in the wide and shallow lower reaches, weak stratification gradients were present and oxygenated conditions (DO > 6 mg l-1) were maintained throughout the water column mainly by wind and tidal action. However, stratification increased towards the deeper, channel-like middle and upper reaches of the estuary, followed by a significant reduction in bottom DO concentrations and development of hypoxia and anoxia. Bottom water hypoxia commonly occurs in microtidal estuaries due to the limited influence of mixing forces, mainly by wind and tidal action. The Goukamma Estuary is a channel-like microtidal estuary where stratification effectively limited oxygenation of the bottom water which resulted in frequent occurrence of bottom water hypoxia. During June 2010 when the highest local rainfall (75 mm) was recorded for the region, salinity and DO data showed that this amount of rainfall was insignificant as it did not replenish the water column of oxygen. Only the surface 0.5 m layer was fresh and oxygenated while below this, the water column was completely hypoxic. In an unimpacted state, the Goukamma Estuary is a blackwater system and is expected to be nutrient poor; however, farming activities in the catchment have resulted in elevated nutrient concentrations. This study showed that significantly higher nutrient concentrations were measured in the middle and upper reaches of the estuary, adjacent to cattle farms situated in the floodplain of these reaches. Nutrient concentrations represented mesotrophic (dissolved inorganic nitrogen [DIN] > 500 μg l-1) to eutrophic conditions (dissolved inorganic phosphorus [DIP] > 25 μg l-1). Nutrient input stimulated phytoplankton to attain a significantly high biomass, ranging between 0.3 – 112 μg l-1 (~ 7.7 ± 1.3 μg l-1; n = 128) and 0.8 – 289 μg l-1 (~ 21.1 ± 4.4 μg l-1; n = 80) during the open and closed states, respectively. High organic loads are associated with high oxygen demands which consequently result in hypoxia following decomposition. Exacerbated by natural salinity stratification which effectively limits oxygenation of the water column, unnaturally high nutrient concentrations and coinciding organic loads place the estuary at particular risk of degradation. This study captured key patterns and processes by quantifying salinity, oxygen and nutrient concentrations in addition to biological indicators (phytoplankton biomass and community composition). Considering possible budget constraints, it is recommended that monthly salinity and oxygen concentrations should be monitored as well as seasonal nutrient concentrations. It is also recommended that riparian buffer zones should be established in the middle and upper reaches of the estuary, as these vegetation buffers have been well documented to contribute to nutrient attenuation and improved water quality from agricultural run-off.
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Reay, William Glendon. "Estuarine sediment nutrient exchange : the importance of physical transport mechanisms and benthic micro-communities /." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07122007-103937/.

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Van, Niekerk Lara. "A framework for regional estuarine management : a South African case study." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/1659.

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Chuwen, Benjamin Michael. "Characteristics of the ichthyofaunas of offshore waters in different types of estuary in Western Australia, including the biology of black bream Acanthopagrus butcheri /." Murdoch University Digital Theses Program, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20100210.154423.

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Veilleux, Lorraine. "Physical oceanography of northern estuaries." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59830.

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Within the context of oceanographic research on northern estuaries in James Bay and Hudson Bay, and in relation with hydroelectric developments and their impact on the physical environment, two studies were undertaken. Both concern the importance of bottom topography, tidal motion and fresh water input on the estuarine processes in these areas.
The first one, in Rupert Bay (south-eastern corner of James Bay), describes tidal and local wind effects on circulation and mixing patterns for summer conditions. An estimate of terms in the lateral momentum equation shows that the centrifugal acceleration, the Coriolis force and the baroclinic pressure gradient are the most important forces at a mid-bay cross section transect.
The second study is concerned with the freshwater plume of Great Whale River (south-eastern Hudson Bay). CTD measurements were used to examine the lift-off point of the plume for under-ice and increasing discharge conditions. Comparison with existing models shows them to be inappropriate for under-ice conditions. Finally, the presence of supercooled water masses in the region of the study is reported.
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Burningham, Helene. "Morphodynamics of west Donegal estuaries." Thesis, University of Ulster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274556.

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Barnes, Jonathan. "Nitrous oxide in UK estuaries." Thesis, University of Newcastle upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273682.

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Bosco-Santos, Alice 1987. "Concentrações de elementos químicos em fígado e músculo de peixes demersais do sistema estuarino de Santos-Cubatão (SP) = aspectos temporal e espacial." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287681.

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Orientador: Wanilson Luiz Silva
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociências
Made available in DSpace on 2018-08-19T12:23:48Z (GMT). No. of bitstreams: 1 Bosco-Santos_Alice_M.pdf: 4095756 bytes, checksum: f3f332df09dceb48c16a8ff0764fe038 (MD5) Previous issue date: 2011
Resumo: A região de Cubatão (SP) abriga o maior polo industrial da América Latina e nos anos de 1980 ficou internacionalmente conhecida como um dos lugares mais seriamente poluídos do planeta por consequência de atividades industriais que ocasionaram grandes perturbações ambientais locais. Desde então, a contaminação da biota do sistema estuarino de Santos-Cubatão vem sendo monitorada e tem apresentado níveis elevados de elementos químicos nos organismos. Entretanto, ainda não foram realizados estudos que levem em consideração amostragens sazonais, que poderiam refletir as consequências das variações físico-químicas do ambiente na transferência de elementos químicos para a biota. No presente estudo, concentrações de As, Se e metais (Cd, Cr, Cu, Fe, Mn, Ni, Pb e Zn) foram determinadas em tecidos hepático e muscular de quatro espécies de peixes demersais do sistema estuarino em foco. No inverno/2010 e verão/2011, exemplares de Diapterus rhombeus, Genidens genidens, Centropomus parallelus e Mugil Liza foram coletados nos rios Morrão, Casqueiro e Cubatão. As amostras foram liofilizadas e os elementos químicos extraídos por digestão ácida com posterior análise por ICP-MS. Os resultados foram comparados ao LMT (limite máximo de tolerância) determinado pelo Ministério da Saúde do Brasil. Concentrações de As, Cr, Cu, Fe, Mn, Pb, Se e Zn foram, em geral, acima do LMT estabelecido pela legislação brasileira, e o tecido hepático apresentou concentrações químicas muito superiores às registradas no tecido muscular. Mugil Liza foi a espécie que acumulou mais elementos químicos em ambos os tecidos e é a melhor bioindicadora da área de estudo. As associações com o substrato e o hábito alimentar mostraram-se fatores decisivos na absorção de elementos químicos pelos organismos. Variabilidades sazonais foram observadas para as concentrações de Cd, Cr, Cu, Fe, Mn e Zn nos tecidos dos organismos analisados. Apesar de o rio Morrão ser considerado um dos cenários mais impactados do sistema estuarino de Santos-Cubatão, a biodisponibilidade de elementos químicos naquele ambiente não parece diferente de ambientes historicamente menos impactados, como os rios Casqueiro e Cubatão
Abstract: The city of Cubatão (SP) holds the largest industrial center in Latin America. During the 1980s, this region became internationally known as one of the most polluted cities in the world. This was a result of local industrial activities that caused large local environmental disturbances. Since then, biota contamination along the Santos-Cubatão estuarine system has been monitored, and high levels of contamination amongst organisms have been found. Environmental monitoring of the biota, taking into account the importance of seasonal variability, has not been considered. Concentrations of As, Se and metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) were determined in liver and muscle tissue of four species of demersal fishes of the Santos-Cubatão estuarine system. Specimens of Diapterus rhombeus, Genidens genidens, Centropomus parallelus and Mugil Liza were collected in summer and winter, in the Morrão, Casqueiro and Cubatão rivers. The samples were freeze-dried, underwent acid digestion and subsequently were analyzed using an ICP-MS. The results were compared to the LMT (maximum allowable) guidelines determined by the Brazilian Ministry of Health. Concentrations of As, Cr, Cu, Fe, Mn, Pb, Se, and Zn were generally above the LMT, as established by Brazilian legislation. Specific organs were analyzed and compared, for instance, liver tissue had contaminant concentrations much higher than those recorded in the muscle tissue. Mugil Liza was the species that accumulated more chemical elements in both tissues. The association with the substrate and eating habits proved to be decisive factors in the absorption of specific contaminants by the organisms. Seasonal variability was observed for concentrations of Cd, Cr, Cu, Fe, Mn, and Zn in the tissues of organisms analyzed. Although the Morrão river is considered one of the scenarios most impacted of the Santos-Cubatão estuarine system, the bioavailability of specific chemical pollutants in this work does not support this scenario, as indicated by the results found in the less impacted environments, such as Cubatão and Casqueiro rivers
Mestrado
Geologia e Recursos Naturais
Mestre em Geociências
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Lee, Deborah Ellen. "An application of the choice experiment method to estimate willingness-to-pay for and guide management on estuarine recreational services." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1020239.

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Among the world‘s ecosystems, estuaries have the highest total economic value per hectare. They are dynamic coastal biomes that provide a host of different goods and services to the surrounding terrestrial and aquatic environments and the people who utilise them. These goods and services include, inter alia, nursery areas for marine organisms, harvested natural resources (such as fish, shell-fish, bait organisms, reeds and mangroves), flood attenuation, water purification, nutrient and sediment sinks, waste disposal, transport, aesthetic beauty and areas for swimming, boating and fishing. Assessing the condition of estuaries is difficult as their state can change depending on what is being measured. Assessments have been carried out on the health of estuaries in South Africa with the results of these studies being used as inputs to the process of assessing the minimum water supply requirements for each estuary (ecological reserve) in order to maintain or improve its functionality. These ecological reserve requirements are assigned using Resource Directed Measures (RDM). These measures, however, have been criticised for being highly complex and too costly to implement for all South African estuaries within a reasonable time period. Another concern is that the levels of demand for recreational goods and services provided by the estuary are not taken into account when assessing estuarine value. It is important to understand that the use of estuaries for recreational purposes is inextricably linked to their health and sound ecological functioning. Although South African estuaries have been quite well buffered from impacts until only very recently, their use and pressures have escalated faster than what conservation authorities and policy makers have been prepared for over the last couple of decades. There is thus mounting pressure on estuaries as recreational outlets, which, in turn, has led to their functional deterioration as well as deterioration in the quality of the recreational experience as a whole. One implication for management is that more and more trade-offs have to be made in an attempt to balance the conservation and recreational use of estuaries.
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Books on the topic "Estuaries"

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Wangersky, Peter J., ed. Estuaries. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/b89479.

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Sanjeevi, S. Baskara. Estuaries. Parangipettai: Environmental Information System [Centre], Centre of Advanced Study in Marine Biology, Annamalai University, 2005.

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Bulloch, David K. Estuaries. Highlands, N.J: American Littoral Society, 1992.

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Sanjeevi, S. Baskara. Estuaries. Parangipettai: Environmental Information System [Centre], Centre of Advanced Study in Marine Biology, Annamalai University, 2005.

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B, Nedwell D., and Raffaelli D. G, eds. Estuaries. San Diego: Academic Press, 1999.

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Buck, A. L. An inventory of UK estuaries. Peterborough, UK: Joint Nature Conservation Committee, 1993.

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C, Heip, and Herman P. M. J, eds. Major biological processes in European tidal estuaries. Dordrecht: Kluwer Academic Publishers, 1995.

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Crane, Julian R. Estuaries: Types, movement patterns and climatical impacts. Hauppauge, N.Y: Nova Science Publishers, 2009.

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van Westen, Cees-Jan, and Reinier Jan Scheele. Planning Estuaries. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0397-8.

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Lana, Paulo da Cunha, and Angelo Fraga Bernardino, eds. Brazilian Estuaries. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77779-5.

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Book chapters on the topic "Estuaries"

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Daborn, Graham R., and Anna M. Redden. "Estuaries." In The Wetland Book, 1–19. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6173-5_281-1.

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Daborn, Graham R., and Anna M. Redden. "Estuaries." In The Wetland Book, 37–54. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-007-4001-3_281.

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Martin, J. M., and J. C. Brun-Cottan. "Estuaries." In Pollution of the North Sea, 88–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-73709-1_5.

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Healy, Terry R. "Estuaries." In Encyclopedia of Earth Sciences Series, 798–803. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93806-6_141.

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Healy, Terry R. "Estuaries." In Encyclopedia of Earth Sciences Series, 1–5. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-48657-4_141-2.

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Nichols, Maynard M., and Robert B. Biggs. "Estuaries." In Coastal Sedimentary Environments, 77–186. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4612-5078-4_2.

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Stronge, William B., Henry F. Diaz, Henry Bokuniewicz, Douglas L. Inman, Scott A. Jenkins, John R. C. Hsu, Michael J. Kennish, et al. "Estuaries." In Encyclopedia of Coastal Science, 436–39. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3880-1_141.

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Kennish, Michael J. "Estuaries." In Climate Change and Estuaries, 43–54. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003126096-4.

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Flor-Blanco, Germán, and Germán Flor. "Cantabrian Estuaries." In The Spanish Coastal Systems, 415–36. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93169-2_18.

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van Westen, Cees-Jan, and Reinier Jan Scheele. "Characteristics of Estuaries." In Planning Estuaries, 9–60. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0397-8_2.

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Conference papers on the topic "Estuaries"

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"Rivers and Estuaries." In 2008 IEEE/OES 9th Working Conference on Current Measurement Technology. IEEE, 2008. http://dx.doi.org/10.1109/ccm.2008.4480874.

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Демиденко, Н., and N. Demidenko. "COASTAL AND ESTUARINE SEDIMENT DYNAMICS IN THE MEZEN BAY AND ESTUARIES MEZEN AND KULOY." In Sea Coasts – Evolution ecology, economy. Academus Publishing, 2018. http://dx.doi.org/10.31519/conferencearticle_5b5ce39a80e646.57291683.

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In the Mezen bay and estuaries Mezen and Kuloy can be high concentrations of mud suspension there, involving the formation at times mobile suspensions and settled mud. Within estuaries the river water is mixed with the sea water by the action of tidal motions, by waves on the sea surface and by the river discharge forcing its way to the sea. Nearly all shallow tidal estuaries, where currents exceed about 1,0m s-1 and where sand is present, have sand waves. Sand waves have a variety of cross-sectional and plan forms.
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Pearce, J. "Status of European Estuaries." In OCEANS '87. IEEE, 1987. http://dx.doi.org/10.1109/oceans.1987.1160581.

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Seferiadou, P., and E. Zaromyti. "Re-writing the estuaries." In 2nd IET International Conference on Intelligent Environments (IE 06). IEE, 2006. http://dx.doi.org/10.1049/cp:20060705.

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Woodruff, Jonathan, Brian C. Yellen, David K. Ralston, and Christine M. Brandon. "HUMAN IMPACTS TO URBANIZED ESTUARIES." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357198.

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McLean, Errol J., and Jon B. Hinwood. "Modelling Entrance Resistance in Estuaries." In 27th International Conference on Coastal Engineering (ICCE). Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40549(276)268.

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Jasińska, Ewa. "Salt Intrusion in Tideless Estuaries." In 22nd International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1991. http://dx.doi.org/10.1061/9780872627765.219.

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"Ice, rivers, estuaries and surf zone." In Proceedings of the IEEE/OES Eighth Working Conference on Current Measurement Technology. IEEE, 2005. http://dx.doi.org/10.1109/ccm.2005.1506343.

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Davis, Curtiss O., and Nicholas Tufillaro. "Hyperspectral imaging of rivers and estuaries." In SPIE Optical Engineering + Applications, edited by Pantazis Mouroulis and Thomas S. Pagano. SPIE, 2013. http://dx.doi.org/10.1117/12.2023401.

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Klemas, V. "Remote Sensing of Estuaries: An Overview." In OCEANS '86. IEEE, 1986. http://dx.doi.org/10.1109/oceans.1986.1160524.

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Reports on the topic "Estuaries"

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Talke, Stefan A., Ed Zaron, and Chris Chickadel. Shallow Turbulence in Rivers and Estuaries. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada573130.

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Aldous, Allison, Jenny Brown, and John Bauer. Coastal Connection: Assessing Oregon Estuaries for Conservation Planning. The Nature Conservancy, April 2008. http://dx.doi.org/10.3411/col.06161753.

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Gangstad, E. O. The Ecology and Environmental Impact of Marshland and Estuaries. Fort Belvoir, VA: Defense Technical Information Center, December 1992. http://dx.doi.org/10.21236/ada268883.

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Albert, David, undefined, and undefined. A hierarchical classification of bays and estuaries in Southeast Alaska. The Nature Conservancy, July 2009. http://dx.doi.org/10.3411/col.07302120.

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Berger, Rutherford C. Foundational Principles in the Development of AdH-SW3, the Three-Dimensional Shallow Water Hydrodynamics and Transport Module within the Adaptive Hydraulics/Hydrology Model. U.S. Army Engineer Research and Development Center, June 2022. http://dx.doi.org/10.21079/11681/44560.

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This report details the design and development of the three-dimensional shallow water hydrodynamics formulation within the Adaptive Hydraulics/Hydrology model (AdH-SW3) for simulation of flow and transport in rivers, estuaries, reservoirs, and other similar hydrologic environments. The report is intended to communicate principles of the model design for the interested and diligent user. The design relies upon several layers of consistency to produce a stable, accurate, and conservative model. The mesh design can handle rapid changes in bathymetry (e.g., steep-sided navigation channels in estuaries) and maintain accuracy in density-driven transport phenomena (e.g., thermal, or saline stratification and intrusion of salinity).
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Monismith, Stephen G. Hydrodynamics in Shallow Estuaries with Complex Bathymetry and Large Tidal Ranges. Fort Belvoir, VA: Defense Technical Information Center, January 2011. http://dx.doi.org/10.21236/ada540795.

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Monismith, Stephen G. Hydrodynamics in Shallow Estuaries with Complex Bathymetry and Large Tidal Ranges. Fort Belvoir, VA: Defense Technical Information Center, September 2011. http://dx.doi.org/10.21236/ada557168.

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Smith, S. Jarrell, David W. Perkey, and Kelsey A. Fall. Cohesive Sediment Field Study : James River, Virginia. U.S. Army Engineer Research and Development Center, August 2021. http://dx.doi.org/10.21079/11681/41640.

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Estuaries trap much of the fine sediment delivered to them by rivers. This phenomenon presents challenges to the US Army Corps of Engineers (USACE) navigation mission, which maintains navigable waterways for waterborne commerce through estuarine regions. The USACE Regional Sediment Management Program and the USACE Norfolk District are conducting a regional sediment transport modeling study to identify cost-effective sediment management schemes in the James River, a tributary estuary of Chesapeake Bay. A key element of the sediment transport modeling study is the definition of cohesive sediment transport processes, such as erosion and settling velocity. This report describes field-based measurements of cohesive sediment erosion and settling velocity conducted in November 2017. The team conducted erosion testing on 15 cores collected throughout the tidal system. Additionally, two anchor stations were occupied to measure tidal variations in vertical distributions of suspended sediment concentration, particle size, and settling velocity. Recommended cohesive sediment transport parameters were developed from the field measurements.
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Windham-Myers, L., W. J. Cai, S. Alin, A. Andersson, J. Crosswell, K. H. Dunton, J. M. Hernandez-Ayon, et al. Chapter 15: Tidal Wetlands and Estuaries. Second State of the Carbon Cycle Report. Edited by N. Cavallaro, G. Shrestha, R. Birdse, M. A. Mayes, R. Najjar, S. Reed, P. Romero-Lankao, and Z. Zhu. U.S. Global Change Research Program, 2018. http://dx.doi.org/10.7930/soccr2.2018.ch15.

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Moftakhari Rostamkhani, Hamed. A Novel Approach to Flow and Sediment Transport Estimation in Estuaries and Bays. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2182.

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