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Recent sedimentological conditions in the delta of the river Kyrönjoki, Western Finland by Heikkilä Raimo is a Environmental Science article available to read on EtoBox.

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The estuary of the River Kyronjoki was echo sounded and, on the basis of these results the delta was delimited and areas of erosion and accumulation were separated . Samples of the sediment surface (0-2 cm) from 65 sites in the estuary were analysed for organic content, C, N, P, Ca, Fe, Mn, Pb, Cu, Zn, Cd and Hg . On the basis of the chemical analyses the delta was divided into two parts according to the sedimentary conditions : (I) In the inner part, where acid fresh water of c . pH 5 .5 from the river is predominant, the conditions were reducing. The Fe/Mn ratio of the sediment was high . The heavy metal content was usually low. The Hg content in the organic compounds of the sediment was, due to the acidity, higher than in the outer part . (II) In the outer part of the delta, where neutral brackish water of pH c. 7 .0 dominates, the sedimentary conditions were mostly oxidizing . The Fe/Mn ratio was very low . The heavy metal and organic content was mostly high in the accumulation areas . This is because the fine-grained allochthonous material, which has a high heavy metal and organic content, flocculates and precipitates when it reaches the brackish water of the Gulf of Bothnia,

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Author

Heikkilä Raimo

Publisher

Springer; Springer-Verlag; Springer (Kluwer Academic Publishers); Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 1573-5141)

Published

1986

Language

EN

Field

Environmental Science (Physical Sciences)