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- W2337133846 abstract "The Mpofu Dam completely blocks the Kromme River a few kilometers above the estuary and prevents a normal flow of freshwater. Because of this, the biological characteristics of the estuary have changed and the system is now more like an arm of the sea t han a productive estuary. An annual allocation of 2 x 10 6 m 3 water (less than 2% of the natural mean annual run-off) is released to prevent the salinity in the estuary from rising above that of the sea (i.e. 35‰). An experiment was undertaken in which the annual allo cation of freshwater was released as a single pulse in an attempt to create a salinity gradient and stimulate a biological response pa rticularly in the estuary water column. The release was expected to create freshwater conditions throughout the upper half of the estuary. Instead the low density freshwater flowed over the more dense seawater and there was little mixing. A week after the release bo th the vertical and longitudinal salinity gradients began to disappear. The measurable concentration of mineral nutrients in the estuary after the release remained low, with the result that there was a negligible increase in microalgal biomass either in the water column or on the subtidal sediment. These effects were noticeable in the zooplankton and larval fish communities, both of which remain ed almost unchanged during and after the release. The results of this experimental release, and other data, indicate that a basefl ow of water is necessary to create a longitudinal salinity gradient and a productive river-estuary interface zone. This information s hould be used to guide assessments of the freshwater requirements of South African estuaries." @default.
- W2337133846 created "2016-06-24" @default.
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- W2337133846 date "2000-01-01" @default.
- W2337133846 modified "2023-10-01" @default.
- W2337133846 title "The effects of a single freshwater release into the Kromme Estuary. 5. Overview and interpretation for the future" @default.
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