Variability of selected hydrochemical parameters of the 3rd order River Odra estuary in relation to hydrology of the area in 1997-2000
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This study aims to investigate the geochemical characteristics of waters of the highly stratified Zrmanja River estuary (eastern Adriatic coast, Croatia).For that purpose, data on salinity and distribution of 16 elements in surface and bottom water of the Zrmanja River estuary was used to assess the spatial variation of trace elements in the estuary water and to identify the main processes governing these variations.The composition of the investigated water was found to be determined primarily by natural factors.Mass concentration levels of dissolved elements were relatively low and typical for unpolluted waters and are considered to primarily reflect the geological and hydrogeological background of the catchment area.The distribution of element mass concentrations along the water column was found to primarily reflect different water masses, the river on the surface and sea at the bottom.Deviation from conservative behaviour for some elements in the bottom water is due to adsorption and desorption processes from the particulate phases.
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Physico-chemical features are among important factor that contributes to the variability of the estuarine environment.This study has been conducted to assess diurnal fluctuations of some physicochemical features in relation to tides in the surface water of Terengganu river estuary.The three stations were set al.,ong the area which linked the river to the coastal water where salinity, temperature, dissolved Oxygen, pH, TSS, chlorophyll-a, Phosphate and silicate nutrients were measured at the surface water for every 2 hrs over a period of 12 hrs during spring tide of September 2012.The salinity changes were found to follow the tidal rhythm, while the daily variation of the remaining feature were found to be more pronounced than the tidal induced variation.With exception to salinity, gradual increases in all features were observed during the day tides, which generally, decreased from afternoon and early morning.The effect of tidal amplitude which said to be important in determining the extent of variation was more pronounced at lower estuary.The remaining stations were observed to be strongly influenced by the river flow.
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