a comprehensive evaluation of the residual levels of organochlorine insecticides (ocis) in the sediment cores of cochin estuarine system (ces) is highlighted in this research article. it assessed the distribution pattern and impact of these xenobiotics in this environmental niche. fifteen persistent organochlorine compounds (ocs) were quantitatively analysed in the six sediment core samples col...

Estuaries as connectors of freshwater and marine aquatic systems are hotspots of biogeochemical element cycling. In one of the best studied temperate estuaries, the Delaware Estuary (USA), we investigated the variability of dissolved organic matter (DOM) over five sampling cruises along the salinity gradient in August and November of 3 consecutive years. Dissolved organic carbon (DOC) concentra...

All major rivers in northwestern Germany that flow into the North Sea, including the Weser River, display rare earth element (REE) patterns with large positive gadolinium (Gd) anomalies that indicate the presence of anthropogenic Gd derived from contrast agents used in magnetic resonance imaging. This microcontaminant cannot be removed by common sewage treatment technology and enters rivers and...

Sediment hyperpycnal flow is one of the most important processes for mass transport, which essential to coastal morphodynamics. Herein, we studied generation and maintenance sediment in Yellow River Estuary (YRE) using a three-dimensional finite volume ocean model (FVCOM). The considered effect sediment-laden water on density stratification, was validated by field hydrodynamic data. Numerical r...

This paper presents findings from a 2-year field investigation of a dissolved hydrocarbon groundwater plume flowing towards a tidally and seasonally forced estuarine river system in Perth, Western Australia. Samples collected from transects of multiport wells along the riverbank and into the river, enabled mapping of the fine scale (0.5 m) vertical definition of the hydrocarbon plume and its lo...

River flow is driven by along-channel pressure gradients and is modified by complex bathymetry that induces secondary flow. Riverine turbulence can be generated and enhanced by flow over sharp bathymetric features, obstructions, and bedforms, which produce macro-turbulent structures [1]. Understanding these details of river flow is challenging, yet important for their direct effects on sediment...

High rainfall associated with El Niño events significantly increases runoff and stream discharge in southern Brazil. High freshwater discharge changes salinity, temperature, and water circulation patterns that can affect the fish estuarine assemblage. Using long-term data obtained from standardized surveys, we analyzed fish assemblage structure and dynamics in shallow waters of the Patos Lagoon...

This paper describes the potential environmental changes caused by tidal power installations with illustration for schemes in the eastern Irish Sea, focussing mainly on major estuarine barrages. The generic impacts in the near-field and far-field are discussed. Results from a 0-D and a 2-D model are presented: the former allows rapid calculations to be made for a large range of options while th...

phytoplankton communities play a significant role in the oceanic biological pump by forming the base of the trophic structure. increase in nutrients loading affects spatial and temporal distribution of phytoplankton. this study examined the phytoplankton community structure and ecological indices in relation to nutrients dynamics in both estuarine and oceanic areas of ramisi-vanga systems alon...

Measurements of velocity and salinity near the mouth and head of the Espinheiro channel (Ria de Aveiro lagoon, Portugal) are used to study the local variation of physical water properties and to assess the balance, under steady conditions, between the seaward salt transport induced by river discharge and the landward dispersion induced by various mixing mechanisms. This assessment is made using...