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Articles de revues sur le sujet « Inverse estuary »

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Auteur : Grafiati
Publié le 20 juillet 2024

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1

Kämpf, Jochen, Nicholas Payne et Paul Malthouse. « Marine Connectivity in a Large Inverse Estuary ». Journal of Coastal Research 26 (novembre 2010) : 1047–56. http://dx.doi.org/10.2112/jcoastres-d-10-00043.1.

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2

Descroix, Luc, Yancouba Sané, Mamadou Thior, Sylvie-Paméla Manga, Boubacar Demba Ba, Joseph Mingou, Victor Mendy et al. « Inverse Estuaries in West Africa : Evidence of the Rainfall Recovery ? » Water 12, no 3 (28 février 2020) : 647. http://dx.doi.org/10.3390/w12030647.

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In West Africa, as in many other estuaries, enormous volumes of marine water are entering the continent. Fresh water discharge is very low, and it is commonly strongly linked to rainfall level. Some of these estuaries are inverse estuaries. During the Great Sahelian Drought (1968–1993), their hyperhaline feature was exacerbated. This paper aims to describe the evolution of the two main West African inverse estuaries, those of the Saloum River and the Casamance River, since the end of the drought. Water salinity measurements were carried out over three to five years according to the sites in order to document this evolution and to compare data with the historical ones collected during the long dry period at the end of 20th century. The results show that in both estuaries, the mean water salinity values have markedly decreased since the end of the drought. However, the Saloum estuary remains a totally inverse estuary, while for the Casamance River, the estuarine turbidity maximum (ETM) is the location of the salinity maximum, and it moves according to the seasons from a location 1–10 km downwards from the upstream estuary entry, during the dry season, to a location 40–70 km downwards from this point, during the rainy season. These observations fit with the functioning of the mangrove, the West African mangrove being among the few in the world that are markedly increasing since the beginning of the 1990s and the end of the dry period, as mangrove growth is favored by the relative salinity reduction. Finally, one of the inverse estuary behavior factors is the low fresh water incoming from the continent. The small area of the Casamance and Saloum basins (20,150 and 26,500 km² respectively) is to be compared with the basins of their two main neighbor basins, the Gambia River and the Senegal River, which provide significant fresh water discharge to their estuary.
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Nunes Vaz, Richard A., Geoffrey W. Lennon et David G. Bowers. « Physical behaviour of a large, negative or inverse estuary ». Continental Shelf Research 10, no 3 (mars 1990) : 277–304. http://dx.doi.org/10.1016/0278-4343(90)90023-f.

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Veeh, H. Herbert, Willard S. Moore et Stephen V. Smith. « The behaviour of uranium and radium in an inverse estuary ». Continental Shelf Research 15, no 13 (novembre 1995) : 1569–83. http://dx.doi.org/10.1016/0278-4343(95)00031-u.

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Shaha, Dinesh Chandra, Yang-Ki Cho, Bong Guk Kim, M. Rafi Afruz Sony, Sampa Rani Kundu et M. Faruqul Islam. « Spatiotemporal variation of Van der Burgh's coefficient in a salt plug estuary ». Hydrology and Earth System Sciences 21, no 9 (13 septembre 2017) : 4563–72. http://dx.doi.org/10.5194/hess-21-4563-2017.

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Abstract. Salt water intrusion in estuaries is expected to become a serious global issue due to climate change. Van der Burgh's coefficient, K, is a good proxy for describing the relative contribution of tide-driven and gravitational (discharge-driven and density-driven) components of salt transport in estuaries. However, debate continues over the use of the K value for an estuary where K should be a constant, spatially varying, or time-independent factor for different river discharge conditions. In this study, we determined K during spring and neap tides in the dry (< 30 m−3 s−1) and wet (> 750 m−3 s−1) seasons in a salt plug estuary with an exponentially varying width and depth, to examine the relative contributions of tidal versus density-driven salt transport mechanisms. High-resolution salinity data were used to determine K. Discharge-driven gravitational circulation (K ∼ 0.8) was entirely dominant over tidal dispersion during spring and neap tides in the wet season, to the extent that salt transport upstream was effectively reduced, resulting in the estuary remaining in a relatively fresh state. In contrast, K increased gradually seaward (K ∼ 0.74) and landward (K ∼ 0.74) from the salt plug area (K ∼ 0.65) during the dry season, similar to an inverse and positive estuary, respectively. As a result, density-driven inverse gravitational circulation between the salt plug and the sea facilitates inverse estuarine circulation. On the other hand, positive estuarine circulation between the salt plug and the river arose due to density-driven positive gravitational circulation during the dry season, causing the upstream intrusion of high-salinity bottom water. Our results explicitly show that K varies spatially and depends on the river discharge. This result provides a better understanding of the distribution of hydrographic properties.
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6

Hofmann, A. F., F. J. R. Meysman, K. Soetaert et J. J. Middelburg. « Factors governing the pH in a heterotrophic, turbid, tidal estuary ». Biogeosciences Discussions 6, no 1 (7 janvier 2009) : 197–240. http://dx.doi.org/10.5194/bgd-6-197-2009.

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Abstract. A method to quantify the influence of kinetically modelled biogeochemical processes on the pH of an ecosystem with time variable acid-base dissociation constants is presented and applied to the heterotrophic, turbid Scheldt estuary (SW Netherlands, N Belgium). Nitrification is identified as the main process governing the pH profile of this estuary, while CO2 degassing and advective-dispersive transport "buffer" the effect of nitrification. CO2 degassing accounts for the largest proton turnover per year in the whole estuary. There is a clear inverse correlation between oxygen turnover and proton turnover. The main driver of long-term changes in the mean estuarine pH from 2001 to 2004 is a changing freshwater flow which influences the pH "directly" via [∑CO2] and [TA] and to a significant amount also "indirectly" via [∑NH4+] and the nitrification rates in the estuary.
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7

Suteja, Yulianto, Anna Ida Sunaryo Purwiyanto et Fitri Agustriani. « Merkuri (Hg) di Permukaan Perairan Muara Sungai Banyuasin, Sumatera Selatan, Indonesia ». Journal of Marine and Aquatic Sciences 5, no 2 (24 octobre 2018) : 177. http://dx.doi.org/10.24843/jmas.2019.v05.i02.p03.

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The purposes of this study were to determine the water quality, concentration and distribution of Hg in the surface water of Banyuasin river estuary. This research was conducted in June 2016 with 26 sampling stations. Measurement of in situ water quality was done using Conductivity Temperature Depth (CTD) multiparameter profiler while Hg metal was measured using Atomic Absorption Spectroscopy (AAS). The data obtained was interpolated by Inverse Distance Weighted (IDW) and then mapped spatially. The results showed that in general the water quality in Banyuasin river estuary still meets the seawater quality standards for marine biota based on KepMenLH no. 51 in 2004. The concentration of Hg in Banyuasin river estuary ranges from 0.001-0.032 mg/L with a distribution pattern that generally increases towards the ocean. The Hg concentration at the Banyuasin river estuary is on the maximum limit and exceeds the quality standard for marine biota.
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8

Messer, LF, M. Doubell, TC Jeffries, MV Brown et JR Seymour. « Prokaryotic and diazotrophic population dynamics within a large oligotrophic inverse estuary ». Aquatic Microbial Ecology 74, no 1 (12 janvier 2015) : 1–15. http://dx.doi.org/10.3354/ame01726.

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9

Winant, Clinton D., et Guillermo Gutiérrez de Velasco. « Tidal Dynamics and Residual Circulation in a Well-Mixed Inverse Estuary ». Journal of Physical Oceanography 33, no 7 (juillet 2003) : 1365–79. http://dx.doi.org/10.1175/1520-0485(2003)033<1365:tdarci>2.0.co;2.

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Gutiérrez de Velasco, Guillermo, et Clinton D. Winant. « Wind- and Density-Driven Circulation in a Well-Mixed Inverse Estuary ». Journal of Physical Oceanography 34, no 5 (mai 2004) : 1103–16. http://dx.doi.org/10.1175/1520-0485(2004)034<1103:wadcia>2.0.co;2.

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11

Lennon, G. W., D. G. Bowers, R. A. Nunes, B. D. Scott, M. Ali, J. Boyle, Cai Wenju et al. « Gravity currents and the release of salt from an inverse estuary ». Nature 327, no 6124 (juin 1987) : 695–97. http://dx.doi.org/10.1038/327695a0.

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12

Jendyk, Jan, Deevesh A. Hemraj, Melissa H. Brown, Amanda V. Ellis et Sophie C. Leterme. « Environmental variability and phytoplankton dynamics in a South Australian inverse estuary ». Continental Shelf Research 91 (décembre 2014) : 134–44. http://dx.doi.org/10.1016/j.csr.2014.08.009.

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13

Nunes, RA, et GW Lennon. « Physical property distributions and seasonal trends in Spencer Gulf, South Australia : an inverse estuary ». Marine and Freshwater Research 37, no 1 (1986) : 39. http://dx.doi.org/10.1071/mf9860039.

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Results are described from the first long-term, systematic program of oceanographic measurements in Spencer Gulf, South Australia. The gulf belongs to a subset of semi-enclosed seas that are characterized by a net fluid loss, in this case induced by excess evaporation, and a resulting circulation that is the reverse of that found in a classical estuary. In Spencer Gulf, this inverse estuary character involves the production of salinities as high as 48 at the head in late summer. The seasonal variations of temperature and salinity, from both large-scale CTD surveys and time-series observations at a fixed station, reveal the manner in which the gulf responds to seasonal influences. From such information, the gulf's dispersive capabilities are quantitatively assessed, and the implications of thermohaline processes for gulf-ocean exchange are discussed.
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14

Lorenz, Marvin, Knut Klingbeil et Hans Burchard. « Impact of Evaporation and Precipitation on Estuarine Mixing ». Journal of Physical Oceanography 51, no 4 (avril 2021) : 1319–33. http://dx.doi.org/10.1175/jpo-d-20-0158.1.

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AbstractRecent studies could link the quantities of estuarine exchange flows to the volume-integrated mixing inside an estuary, where mixing is defined as the destruction of salinity variance. The existing mixing relations quantify mixing inside an estuary by the net boundary fluxes of volume, salinity, and salinity variance, which are quantified as Knudsen or total exchange flow bulk values. So far, river runoff is the only freshwater flux included, and the freshwater exchange due to precipitation and evaporation is neglected. Yet, the latter is the driving force of inverse estuaries, which could not be described by the existing relations. To close this gap, this study considers evaporation and precipitation to complete the existing mixing relations by including cross-surface salinity variance transport. This allows decomposing the mixing into a riverine and a surface transport contribution. The improved relations are tested against idealized two-dimensional numerical simulations of different combinations of freshwater forcing. The mixing diagnosed from the model results agrees exactly with the derived mixing relation. An annual hindcast simulation of the Persian Gulf is then used to test the mixing relations, both exact and approximated, e.g., long-term averaged, for a realistic inverse estuary. The results show that the annual mean mixing contributions of river discharge and evaporation are almost equal, although the freshwater transport due to evaporation is about one order of magnitude larger than the river runoff.
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15

Nunes-Vaz, Richard A. « The salinity response of an inverse estuary to climate change & ; desalination ». Estuarine, Coastal and Shelf Science 98 (février 2012) : 49–59. http://dx.doi.org/10.1016/j.ecss.2011.11.023.

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16

Passadore, Cecilia, Luciana Möller, Fernando Diaz-Aguirre et Guido J. Parra. « Demography of southern Australian bottlenose dolphins living in a protected inverse estuary ». Aquatic Conservation : Marine and Freshwater Ecosystems 27, no 6 (12 mai 2017) : 1186–97. http://dx.doi.org/10.1002/aqc.2772.

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17

Lomakin, P. D. « Investigation of the field of colored dissolved organic matter concentration and its relationship to the salinity field in Dnieper-Bug estuary ». Monitoring systems of environment, no 2 (24 juin 2021) : 72–80. http://dx.doi.org/10.33075/2220-5861-2021-2-72-80.

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Based on the data of the expedition carried out in August 2012, the features of the structure of the salinity and fDOM concentration fields, as well as the correlation between these values ​​in the Dnieper-Bug estuary, are analyzed. It is shown that the salinity field in the Dnieper-Bug estuary is characterized by all structural features typical of coastal sea areas freshened by river runoff, while the fDOM concentration field has anomalous properties due to the presence of an anthropogenic component of this value. The presence of fDOM of anthropogenic origin is most significant in the western part of the Dnieper estuary and is related to the influence of the city and port of Ochakov. The maximum content of fDOM was recorded here, which caused an anomalous horizontal distribution of this substance concentration, increasing from the mouth of the Dnieper to the open Black Sea waters. The contaminated areas of the studied water areas, which are adjacent to settlements and occupy the predominant part of the water surface of the Dnieper-Bug estuary, are characterized by an increased fDOM content and intrusive feature of the vertical structure of this substance concentration field of. It is revealed that in the Dnieper-Bug estuary there is no inverse correlation between the salinity fields and fDOM concentration, which is typical for unpolluted coastal waters, freshened by river runoff. A similar anomaly is an indicator of the pollution of coastal waters with organic matter.
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18

Corlis, Nicholas J., H. Herbert Veeh, John C. Dighton et Andrew L. Herczeg. « Mixing and evaporation processes in an inverse estuary inferred from δ2H and δ18O ». Continental Shelf Research 23, no 8 (mai 2003) : 835–46. http://dx.doi.org/10.1016/s0278-4343(03)00029-3.

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19

Petrusevics, P., J. A. T. Bye, V. Fahlbusch, J. Hammat, D. R. Tippins et E. van Wijk. « High salinity winter outflow from a mega inverse-estuary—the Great Australian Bight ». Continental Shelf Research 29, no 2 (février 2009) : 371–80. http://dx.doi.org/10.1016/j.csr.2008.10.003.

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20

Parolin, Radael de Souza, Antônio José da Silva Neto, Pedro Paulo Gomes Watts Rodrigues et Orestes Llanes Santiago. « Estimation of a contaminant source in an estuary with an inverse problem approach ». Applied Mathematics and Computation 260 (juin 2015) : 331–41. http://dx.doi.org/10.1016/j.amc.2015.03.054.

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21

de Silva Samarasinghe, J. R., et G. W. Lennon. « Hypersalinity, flushing and transient salt-wedges in a tidal gulf—an inverse estuary ». Estuarine, Coastal and Shelf Science 24, no 4 (avril 1987) : 483–98. http://dx.doi.org/10.1016/0272-7714(87)90129-6.

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22

Cai, H., H. H. G. Savenije et C. Jiang. « Analytical approach for predicting fresh water discharge in an estuary based on tidal water level observations ». Hydrology and Earth System Sciences 18, no 10 (17 octobre 2014) : 4153–68. http://dx.doi.org/10.5194/hess-18-4153-2014.

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Abstract. As the tidal wave propagates into an estuary, the tidally averaged water level tends to rise in landward direction due to the density difference between saline and fresh water and the asymmetry of the friction. The effect of friction on the residual slope is even more remarkable when accounting for fresh water discharge. In this study, we investigate the influence of river discharge on tidal wave propagation in the Yangtze estuary with specific attention to residual water level slope. This is done by using a one-dimensional analytical model for tidal hydrodynamics accounting for the residual water level. We demonstrate the importance of the residual slope on tidal dynamics and use it to improve the prediction of the tidal propagation in estuaries (i.e. tidal damping, velocity amplitude, wave celerity and phase lag), especially when the influence of river discharge is significant. Finally, we develop a new inverse analytical approach for estimating fresh water discharge on the basis of tidal water level observations along the estuary, which can be used as a tool to obtain information on the river discharge that is otherwise difficult to measure in the tidal region.
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Cai, H., H. H. G. Savenije et C. Jiang. « Analytical approach for predicting fresh water discharge in an estuary based on tidal water level observations ». Hydrology and Earth System Sciences Discussions 11, no 6 (27 juin 2014) : 7053–87. http://dx.doi.org/10.5194/hessd-11-7053-2014.

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Abstract. As the tidal wave propagates into an estuary, the tidally averaged water level tends to rise in landward direction due to the density difference between saline and fresh water and the asymmetry of the friction. The effect of friction on the residual slope is even more remarkable when accounting for fresh water discharge. In this study, we investigate the influence of river discharge on tidal wave propagation in the Yangtze estuary with specific attention to residual water level slope. This is done by using a one-dimensional analytical model for tidal hydrodynamics accounting for the residual water level. We demonstrate the importance of the residual slope on tidal dynamics and use it to improve the prediction of the tidal propagation in estuaries (i.e., tidal damping, velocity amplitude, wave celerity and phase lag), especially when the influence of river discharge is significant. Finally, we develop a new inverse analytical approach for estimating fresh water discharge on the basis of tidal water level observations along the estuary, which can be used as a tool to obtain information on the river discharge that is otherwise difficult to measure in the tidal region.
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BITTENCOURT, ABÍLIO C. S. P., GUILHERME C. LESSA, JOSÉ M. L. DOMINGUEZ, LOUIS MARTIN, GERALDO S. VILAS BÔAS et FÉLIX F. FARIAS. « High and low frequency erosive and constructive cycles in estuarine beaches : an example from Garcez Point, Bahia/Brazil ». Anais da Academia Brasileira de Ciências 73, no 4 (décembre 2001) : 599–610. http://dx.doi.org/10.1590/s0001-37652001000400013.

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Monitoring of the morphodynamic variations of the beaches associated with an estuary contiguous with Garcez Point, Bahia, Brazil, and the superposition of aerial photographs from the region, show the presence of distinctive erosive and constructive cycles of low and high frequencies. Between 1959 and 1989, one event of shoreline erosion and progradation was recognized on the oceanic beaches just outside the estuary. Inside the estuary, an erosion phase at the southern margin coincides with a constructive phase at the other side, and vice-versa. On the southern estuarine beach, low-frequency cycles of erosion and progradation are also perceived, but with the inverse trend when compared to the contiguous oceanic beach. During the beach monitoring period (February/1991 to July/1992), the oceanic beach showed retreat rates varying from 23.7m/year, at the channel entrance, to 1.0m/year, three kilometers away from it. During the same period, the estuarine beach advanced at a rate of 60.3m/year. The long-term dynamics of the shoreline position in both sides of the estuarine entrance appears to be related to the position of the channel in the ebb-tidal delta.
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Mwamlavya, Hamadi M., Cosmas N. Munga, Benard M. Fulanda, Johnstone O. Omukoto, Pascal Z. Thoya, Fiona Mackay, Fatma H. Manyenze et Johan C. Groeneveld. « Natural resource-use in the Lower Tana River Delta based on household surveys and remote sensing of land cover and land use patterns ». Western Indian Ocean Journal of Marine Science, no 1/2021 (23 décembre 2021) : 115–29. http://dx.doi.org/10.4314/wiojms.si2021.1.8.

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Household survey data and spatially explicit Sentinel-2 satellite images of land cover and land use during the dry and wet seasons were used to investigate livelihood strategies in the Lower Tana River Delta in Kenya, where food security and economic activity rely almost exclusively on ecosystem goods and services. Land cover classification of satellite imagery successfully showed seasonal changes to estuary-related vegetation and habitats from which land use cycles could be inferred. Flood-recession agriculture and part-time fishing were the most common activities at Ozi village, some 10 km upstream from the estuary mouth, whereas full-time fishing dominated activities at Kipini town, where the Tana Estuary discharges into Ungwana Bay. Seasonality of fishing at Kipini depended on favourable sea conditions, arrival of migrant fishers and peaks in shrimp abundance. Seasonality of agriculture at Ozi depended on the freshwater flooding regime, visible in satellite images as an inverse relationship of areas covered by wetlands and cultivated lands. The predominance of fishing assets at Kipini indicated specialization, which underlies a socio-economic network of fish processing, marketing, distribution and logistical support services. In contrast, mixed farming assets and traditional fishing gear at Ozi reflected more diversified farmer-fisher livelihoods, as a risk avoidance strategy. Key outcomes of this study were that land cover and land use were strongly seasonal, that coastal and upstream communities in the Tana Estuary relied on different combinations of ecosystem goods and services, and that livelihood strategies at the two locations differed fundamentally. Combining social, spatial and ecological data to describe socio-ecological systems typical of the Tana Estuary provided a broad platform for shared resource management strategies.
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Vethamony, P., M. T. Babu, M. V. Ramanamurty, A. K. Saran, Antony Joseph, K. Sudheesh, Rupali S. Padgaonkar et S. Jayakumar. « Thermohaline structure of an inverse estuary – The Gulf of Kachchh : Measurements and model simulations ». Marine Pollution Bulletin 54, no 6 (juin 2007) : 697–707. http://dx.doi.org/10.1016/j.marpolbul.2007.01.022.

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Abdul Aziz, Nandi, Yonvitner, Sigid Hariyadi, Syamsul Bahri Agus et I. Wayan Nurjaya. « Sedimentation Profile in Coastal Water Jakarta Bay ». Journal of Tropical Fisheries Management 6, no 1 (12 janvier 2023) : 35–44. http://dx.doi.org/10.29244/jppt.v6i1.43452.

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The waters of Jakarta Bay are one of the waters that are influenced by several fresh water flows that enter from the DKI Jakarta area and its surroundings. Sediment that enters the waters of Jakarta Bay is produced by the activities of the people who live in the Jakarta area and its surroundings. This study aims to analyze the sedimentation and distribution of suspended solids in the Jakarta Bay estuary using an observational approach and spatial analysis. This study uses the Inverse Distance Weighting (IDW) interpolation method. The dominant distribution of sediment in Jakarta Bay is sand with a size ranging from 0.25 to 0.125 mm. TSS (Total Suspended Solids) levels in 11 estuaries in Jakarta Bay ranged from 21 to 150 mg/L in first period and 11 ˗ 259 mg/L in second period. Sedimentation rates that occurred in 11 Jakarta Bay estuaries ranged from 11.12 g/cm2/day to 619.5 g/cm2/day in period one and 10.96 g/cm2/day to 1232.06 g/cm2/day in the second period which is located in Muara Cilincing in both periods. There is a suitable relationship between the TSS value and the sedimentation rate. Estuary TSS values and sedimentation rates are influenced by seasons and anthropogenic activities that occur in the estuary such as reclamation.
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Hein, Sebastian S. V., Vanessa Sohrt, Edgar Nehlsen, Thomas Strotmann et Peter Fröhle. « Tidal Oscillation and Resonance in Semi-Closed Estuaries—Empirical Analyses from the Elbe Estuary, North Sea ». Water 13, no 6 (19 mars 2021) : 848. http://dx.doi.org/10.3390/w13060848.

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Many tidal influenced estuaries and coastal basins feature tidal amplification because of, e.g., convergence and reflection. Increasing amplification rates were observed in the Elbe estuary, with consequences for construction measures, nautical manoeuvring, flood protection, riverbed morphology and ecosystems. Although many studies were conducted investigating the tidal wave transformation in estuaries, studies based on spatially well-distributed empirical data covering periods over more than a year are rare. To fill this gap, a self-developed adapted harmonic analysis method of least squares was applied to hydrographs from 25 gauges, distributed over the tidal influenced estuary from the river mouth to the tidal border which is given by the weir 160 km upstream of the river mouth. The investigation period for the harmonic analyses covers a whole nodal cycle of 18.613 a beginning in the year 2000. The tidal constituents’ oscillatory behaviour including the appearance of compound tides, generated by nonlinear shallow water processes, and the formation of reflection induced partially standing waves are determined. The tidal constituents show shared frequency-group specific partial clapotis, but also have significant differences in amplification within those groups. The latter fact contributes to the detected inverse proportionality of tidal range amplification inside the estuary to incoming tidal wave height. As reflection can cause resonance in tidal influenced rivers, tests are developed to analyse whether criteria for resonance are met. To determine the system’s specific resonance frequency, a new method was introduced with the three-parameter Lorentzian curve-fitting. As the detected resonance frequency is not close to tidal frequencies, full-established resonance of the tidal wave and of the tidal constituents is not observed in the Elbe estuary. Migrating nodes of the partially standing tidal wave hint at increasing latent resonance.
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Kämpf, Jochen, et Henry Ellis. « Hydrodynamics and Flushing of Coffin Bay, South Australia : A Small Tidal Inverse Estuary of Interconnected Bays ». Journal of Coastal Research 300 (5 mars 2015) : 447–56. http://dx.doi.org/10.2112/jcoastres-d-14-00046.1.

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Simier, M., L. Blanc, C. Aliaume, P. S. Diouf et J. J. Albaret. « Spatial and temporal structure of fish assemblages in an “inverse estuary”, the Sine Saloum system (Senegal) ». Estuarine, Coastal and Shelf Science 59, no 1 (janvier 2004) : 69–86. http://dx.doi.org/10.1016/j.ecss.2003.08.002.

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Nidzieko, Nicholas J., et Stephen G. Monismith. « Contrasting Seasonal and Fortnightly Variations in the Circulation of a Seasonally Inverse Estuary, Elkhorn Slough, California ». Estuaries and Coasts 36, no 1 (6 septembre 2012) : 1–17. http://dx.doi.org/10.1007/s12237-012-9548-1.

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Catalá, Teresa S., Natalie Mladenov, Fidel Echevarría et Isabel Reche. « Positive trends between salinity and chromophoric and fluorescent dissolved organic matter in a seasonally inverse estuary ». Estuarine, Coastal and Shelf Science 133 (novembre 2013) : 206–16. http://dx.doi.org/10.1016/j.ecss.2013.08.030.

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Ross, Lauren, Aldo Sottolichio, Tanguy Maury, Sandric Lesourd et Antoine Gardel. « Intratidal and Subtidal Circulation in a Tropical Estuary during Wet Season : The Maroni, French Guiana ». Journal of Marine Science and Engineering 7, no 12 (28 novembre 2019) : 433. http://dx.doi.org/10.3390/jmse7120433.

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Observations of water level, current velocity, river discharge, wind and salinity were collected in the Maroni estuary, on the border of French Guiana and Suriname during the wet season of 2018 to explore subtidal circulation patterns. Measurements are complimented by the application of analytical models with an aim to diagnose forcing mechanisms responsible for producing subtidal flows during the day of data collection and to extrapolate these findings to other time periods with variable wind and river forcing. Subtidal along-channel flows were found to be dominated by river discharge, with seaward directed velocities found throughout the channel section reaching 40 cm s − 1 . This pattern was altered with strong southwesterly winds, which produced and inverse gravitational circulation pattern despite the elevated river discharge. Secondary, or cross-channel flows, displayed a three-layer vertical structure in the main channel due to a combination of channel curvature and tidal asymmetry in the lateral baroclinic pressure gradient. The pressure gradient was produced by a salinity intrusion front that only manifested in the channel during flood tide. This is the first comprehensive study of tidal and subtidal flow dynamics in the Maroni estuary.
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Ambarwulan, W., M. S. Salama, W. Verhoef et C. M. Mannaerts. « The estimation of total suspended matter from satellite imagery of tropical coastal water Berau Estuary, Indonesia ». IOP Conference Series : Earth and Environmental Science 950, no 1 (1 janvier 2022) : 012089. http://dx.doi.org/10.1088/1755-1315/950/1/012089.

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Abstract Water in coastal and estuary areas needs to be investigated as human activities is allegedly decrease their quality. This has led to optical remote sensing for mapping optical water quality using empirical and semi-analytical approaches. Therefore, this study aims to estimate the Total Suspended Matter (TSM) concentration from Medium Resolution Imaging Spectrometer (MERIS) data using a spectral unmixing approach combined with a radiative transfer model. This approach was implemented in the equatorial tropical coastal water, the Berau estuary, Indonesia, by generating a look-up table (LUT) of top-of-atmosphere radiance spectra through the coupled forward models, and the endmembers were selected from the LUT. The spectral unmixing algorithm was employed to the MERIS data for decomposing the image into haze and sediment components. The data were then transformed into images of a constant haze level corresponding to 50 km visibility, and the atmospheric correction was applied. Furthermore, the TMS concentration was retrieved using the inverse semi-analytical Kubelka-Munk model. The result gave overestimated TSM concentration values on clear waters. However, in turbid waters, a lower RMSE was obtained, and the coefficient of determination was higher than in clear waters.
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Medeiros, AMA, JEL Barbosa, PR Medeiros, RM Rocha et LF Silva. « Salinity and freshwater discharge determine rotifer distribution at the Mossoró River Estuary (Semiarid Region of Brazil) ». Brazilian Journal of Biology 70, no 3 (août 2010) : 551–57. http://dx.doi.org/10.1590/s1519-69842010000300011.

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The present study aimed at evaluating differences in rotifer distribution in three estuarine zones in an inverse estuary located in the Semiarid Region of Brazil. Zones were chosen based on their proximity to the ocean and river border as a means of reflecting a horizontal salinity gradient. High freshwater discharge during the rainy season was the major determinant of rotifer composition. On the other hand, due to higher salinity values during the dry season, very low values of species richness and abundance were observed in all zones. Therefore, the study highlights the constraints of salinity and the positive influence of seasonality and river proximity on rotifer species in a semiarid estuarine environment.
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Yu, Xin, Jian Shen et Jiabi Du. « An inverse approach to estimate bacterial loading into an estuary by using field observations and residence time ». Marine Environmental Research 166 (avril 2021) : 105263. http://dx.doi.org/10.1016/j.marenvres.2021.105263.

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Seuront, Laurent, Mark Doubell et Paul Van Ruth. « Virally-Mediated Versus Grazer-Induced Mortality Rates in a Warm-Temperate Inverse Estuary (Spencer Gulf, South Australia) ». Open Journal of Marine Science 04, no 04 (2014) : 257–78. http://dx.doi.org/10.4236/ojms.2014.44024.

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Gning, Ndombour, François Le Loc'h, Omar T. Thiaw, Catherine Aliaume et Guy Vidy. « Estuarine resources use by juvenile Flagfin mojarra (Eucinostomus melanopterus) in an inverse tropical estuary (Sine Saloum, Senegal) ». Estuarine, Coastal and Shelf Science 86, no 4 (mars 2010) : 683–91. http://dx.doi.org/10.1016/j.ecss.2009.11.037.

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Burchard, Hans. « Combined Effects of Wind, Tide, and Horizontal Density Gradients on Stratification in Estuaries and Coastal Seas ». Journal of Physical Oceanography 39, no 9 (1 septembre 2009) : 2117–36. http://dx.doi.org/10.1175/2009jpo4142.1.

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Abstract The aim of this one-dimensional water column study is to combine modified versions of three characteristic parameters for periodic tidal flow under the influence of a longitudinal buoyancy gradient—the horizontal Richardson number, the inverse Strouhal number, and the inverse Ekman number—into a parameter space study, including constant wind forcing from various directions. It is shown how the underlying dynamical equations can be cast into nondimensional form, depending mainly on these three nondimensional parameters plus the relative wind speed and the wind direction. Idealized model simulations are carried out for the whole realistic range of horizontal Richardson and inverse Strouhal numbers for various latitudes, showing the amplitude of the tidally induced stratification for a wide range of scenarios. It is found that classical threshold values for the horizontal Richardson number, indicating the switch from periodic stratification to permanent stratification, are valid only for special cases, and that this switch also strongly depends on the inverse Strouhal number, the inverse Ekman number, and the wind vector. The transverse residual flow is close to the thermal wind balance for a variety of parameters, and nondimensionalized longitudinal residual flow shows the classical estuarine exchange flow pattern with little variation in the near-bed onshore component. Wind straining is confirmed as an important estuarine and coastal process, enhancing estuarine circulation for offshore (down estuary) winds and vice versa. Agreement with field data from Liverpool Bay is good, including the explanation of a flood tide local maximum of the dissipation rate in the upper half of the water column. An equation for the second time derivative of the potential energy anomaly is derived for quantifying the dynamical processes leading to stratification due to the straining of the horizontal density gradient.
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Sarker, Md Jahangir, Pallab Kumer Sarker, Lawrence B. Cahoon, Afsana Kabir Dipty, Md Abul Bashar, Md Monjurul Hasan, Yahia Mahmud et Md Milon Sarker. « Seasonal Variation in the Epibenthic Feeding Habits of Hilsa Shad (Tenualosa ilisha) in the Upper Meghna River Estuary, Bangladesh ». Fishes 8, no 7 (24 juin 2023) : 335. http://dx.doi.org/10.3390/fishes8070335.

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Seasonal changes in feeding habits of hilsa (Tenualosa ilisha) were studied monthly in 2019 in the upper Meghna estuary, Bangladesh, through gut content analyses. Tychoplanktonic diatoms followed by copepods were abundant in all months and size groups of hilsa. The inverse relationship between niche breadth and relative length of the gut revealed hilsa consume a variety of food at their early stages while their feeding habit changes towards diatoms during the adult stage with the development of gill rakers. Young hilsas prefer mostly tychoplanktonic diatoms (Aulacoseira sp., Triceratium sp., Nitzschia sp., Synedra sp., and Coscinodiscus sp.) and copepods (Pseudodiaptomus sp.). However, adult hilsas rejected Aulacoseira sp. during their spawning season. Ingested sand grains correlated with tychoplankton, revealing their food value from epipelic microalgae and bacteria clinging to them and epibenthic foraging by young hilsas. Thus, this study revealed that young hilsas primarily feed on tychoplanktonic diatoms and copepods from water and near bottom of the upper Meghna estuary during January to June while later stages with the development of gill rakers allow hilsas to feed on planktonic diatoms. Epibenthic feeding needs to be considered more fully in evaluating the biology of hilsa and, perhaps, other clupeids, and in evaluating possible human impacts on this foraging habitat.
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Kämpf, J., et M. Sadrinasab. « The circulation of the Persian Gulf : a numerical study ». Ocean Science 2, no 1 (5 juillet 2006) : 27–41. http://dx.doi.org/10.5194/os-2-27-2006.

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Abstract. We employ a three-dimensional hydrodynamic model (COHERENS) in a fully prognostic mode to study the circulation and water mass properties of the Persian Gulf – a large inverse estuary. Our findings, which are in good agreement with observational evidence, suggest that the Persian Gulf experiences a distinct seasonal cycle in which a gulf-wide cyclonic overturning circulation establishes in spring and summer, but this disintegrates into mesoscale eddies in autumn and winter. Establishment of the gulf-wide circulation coincides with establishment of thermal stratification and strengthening of the baroclinic exchange circulation through the Strait of Hormuz. Winter cooling of extreme saline (>45) water in shallow regions along the coast of United Arab Emirates is a major driver of this baroclinic circulation.
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Kämpf, J., et M. Sadrinasab. « The circulation of the Persian Gulf : a numerical study ». Ocean Science Discussions 2, no 3 (12 mai 2005) : 129–64. http://dx.doi.org/10.5194/osd-2-129-2005.

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Abstract. We employ a three-dimensional hydrodynamic model (COHERENS) to study the circulation and water mass properties of the Persian Gulf, which is a large inverse estuary. Our findings suggest that the Persian Gulf experiences a distinct seasonal cycle in which a Gulf-wide cyclonic overturning circulation establishes in spring and summer, but this disintegrates into mesoscale eddies in autumn and winter. Establishment of the Gulf-wide circulation coincides with establishment of thermal stratification and strengthening of the baroclinic exchange circulation through the Strait of Hormuz. The latter is associated with winter cooling of extreme saline (>45 psu) water in shallow regions along the coast of United Arab Emirates. To validate the model results, we present a detailed comparison with observational evidence.
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Cook, PLM, D. Van Oevelen, K. Soetaert et JJ Middelburg. « Carbon and nitrogen cycling on intertidal mudflats of a temperate Australian estuary. IV. Inverse model analysis and synthesis ». Marine Ecology Progress Series 394 (18 novembre 2009) : 35–48. http://dx.doi.org/10.3354/meps08270.

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Alvarez, Luis G., et Sarah E. Jones. « Short-term Observations of Suspended Particulate Matter in a Macro-tidal Inverse Estuary : The Upper Gulf of California ». Journal of Coastal Research 203 (juillet 2004) : 645–54. http://dx.doi.org/10.2112/1551-5036(2004)20[645:soospm]2.0.co;2.

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Gning, Ndombour, Guy Vidy et Omar Thiom Thiaw. « Feeding ecology and ontogenic diet shifts of juvenile fish species in an inverse estuary : The Sine-Saloum, Senegal ». Estuarine, Coastal and Shelf Science 76, no 2 (janvier 2008) : 395–403. http://dx.doi.org/10.1016/j.ecss.2007.07.018.

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Hossain, Md Afzal, Deevesh Ashley Hemraj, Qifeng Ye, Sophie C. Leterme et Jian G. Qin. « Diet overlap and resource partitioning among three forage fish species in Coorong, the largest inverse estuary in Australia ». Environmental Biology of Fishes 100, no 6 (15 mars 2017) : 639–54. http://dx.doi.org/10.1007/s10641-017-0592-3.

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Riche, Olivier G. J., et Rich Pawlowicz. « Variability in a fjord-like coastal estuary I : Quantifying the circulation using a formal multi-tracer inverse approach ». Estuarine, Coastal and Shelf Science 137 (janvier 2014) : 1–13. http://dx.doi.org/10.1016/j.ecss.2013.11.018.

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Sané, Babacar, Malick Diouf, Frédéric Jean, Jonathan Flye-Sainte-Marie, Malika Kerhervé, Caroline Fabioux et Yoann Thomas. « Reproduction patterns of the bloody cockle Senilia senilis (Linnaeus 1758) in the Sine-Saloum inverse estuary ». Aquatic Living Resources 36 (2023) : 33. http://dx.doi.org/10.1051/alr/2023029.

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Understanding the reproductive biology of a species is an important means of determining the renewal capacity of natural stocks, especially in the case of heavily exploited species. It is a fundamental element in supporting the implementation of management measures. Here, we studied the bloody cockle (S. senilis) in the Sine-Saloum, with the aim of describing its seasonal and spatial reproductive cycle. S. senilis reproduction was studied over an annual cycle at two sites chosen for their contrasting situations along the upstream-downstream gradient. The reproductive cycle was studied by histological analysis of a pool of individuals maintained in-situ and sampled throughout the year. Our results showed that gamete maturation is asynchronous within and between individuals. Gametogenesis mostly occurred in October. The maturation stage showed a seasonal pattern with continuous reproduction throughout the year, with two preferred periods between May and July and December and February. The reproductive cycle is highly dependent on temperature and salinity variations, resulting in a seasonal cycle and spatial heterogeneity. The temperature induces gametogenesis and salinity synchronizes the spawning periods.
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Cai, Huayang, Ping Zhang, Erwan Garel, Pascal Matte, Shuai Hu, Feng Liu et Qingshu Yang. « A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries ». Hydrology and Earth System Sciences 24, no 4 (16 avril 2020) : 1871–89. http://dx.doi.org/10.5194/hess-24-1871-2020.

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Abstract. Assessing the impacts of both natural (e.g. tidal forcing from the ocean) and human-induced changes (e.g. dredging for navigation and land reclamation) on estuarine morphology is particularly important for the protection and management of the estuarine environment. In this study, a novel analytical approach is proposed for the assessment of estuarine morphological evolution in terms of tidally averaged depth on the basis of the observed water levels along the estuary. The key lies in deriving a relationship between wave celerity and tidal damping or amplification. For given observed water levels at two gauging stations, it is possible to have a first estimation of both wave celerity (distance divided by tidal travelling time) and tidal damping or amplification rate (tidal range difference divided by distance), which can then be used to predict the morphological changes via an inverse analytical model for tidal hydrodynamics. The proposed method is applied to the Lingdingyang Bay of the Pearl River Estuary, located on the southern coast of China, to analyse the historical development of the tidal hydrodynamics and morphological evolution. The analytical results show surprisingly good correspondence with observed water depth and volume in this system. The merit of the proposed method is that it provides a simple approach for understanding the decadal evolution of the estuarine morphology through the use of observed water levels, which are usually available and can be easily measured.
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Wahyuni, Weni Indah, Bintal Amin et Sofyan Husein Siregar. « ANALYSIS OF NITRATE, PHOSPHATE, AND SILICATE CONTENT AND THEIR EFFECTS ON PLANKTONIC ABUNDANCE IN THE ESTUARY WATERS OF BATANG ARAU OR PADANG CITY WEST SUMATRA PROVINCE ». Asian Journal of Aquatic Sciences 4, no 1 (7 avril 2021) : 1–12. http://dx.doi.org/10.31258/ajoas.4.1.1-12.

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The entry of nutrients (nitrate, phosphate and silicate) from land-based anthropogenic activities (industry, agriculture and household waste) through rivers can potentially cause changes in water quality and will affect fertility and aquatic organisms such as phytoplankton. These three nutrients play an important role in the living tissue cells of living organisms and in the photosynthesis process. This study aims to analyze the effect of nitrate, phosphate and silicate content on the plankton abundance in the estuary of the Batang Arau River, Padang, West Sumatra. The method used is a survey method, the determination of the sampling station is done by purposive sampling, data were analysed by Excel and SPSS Software. Based on the results of laboratory analysis, the nitrate content ranged from 0,117 to 0,485 mg/l, phosphate content from 0,239 to 0,704 mg/l, and silicate content from 0,031 to 0,685 mg/l. Planktonic diatom abundance in the estuary of the Batang Arau River ranges from 194 to 750 ind/l. The results of the statistical analysis of the effect of nitrate, phosphate and silicate with an abundance of diatoms are expressed by the equation Y = 743,019 - 481,828Nitrate - 199,552Phosphate - 172,971Silicate. This equation explains that the effect of nitrate, phosphate and silicate content on diatom abundance has an inverse or negative relationship, where nitrate, phosphate and silicate levels increase, the diatom abundance will decrease. The difference of content and the relationship between parameters analyzed in this research are discussed.
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