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Continental waters biological processes

The accumulation of sediments in estuaries appears to be so effective that Meade (1981) has estimated that, "Probably less than 5 percent of all river sediment discharged into the tidal waters of the Atlantic seaboard is deposited on the floor of the continental shelf or the deep sea". These sediments contain an often dramatic imprint of human activity and impact on the estuary and its watershed. But it is an imprint which results not only from the input of materials, but also from the interaction of a great variety of physical, chemical and biological processes in the estuary. We are only beginning to learn to read that record, but the early results suggest that we may learn more about what flows between rivers and the sea from the humble muds on the estuary floor than we can from the water above. [Pg.117]

The sediments represent the major sink for material in the oceans. The main pathway to the sediments is the deposition of suspended particles. Such particles may be only in transit through the ocean from a continental origin or be formed in situ by chemical and biological processes. Sinking particles can scavenge material from solution. Accordingly, this section introduces the components found in marine sediments, but emphasises processes that occur within the water column that lead to the formation and alteration of the deposited material. [Pg.210]

Abstract. Water quality modelling in small rivers is often considered unworthy from a practical and economic point of view. This work shows that a simple model structure can be set up to describe the stationary water quality in small river basins in terms of carbon and nitrogen compounds, when it is unfeasible to use complex models. The one-dimensional model include principle factors such as chemical and biological oxidation, concentration of nutrients. Natural process of selfpurification for small river in sharp continental climate of Central Siberia is inhibited by low temperatures, rapid currents and poor development of plankton cenosis. So, a determination of model parameters demands carrying out of special experiments with water samples. The results of numerical modelling are verified by data from the environmental monitoring of some rivers in the basin of Central Enisey. [Pg.158]


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Biological processes

Biology water

Continental

Continental waters

Process water

Water biological

Water processing

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