Composition of the suspended particulate matter at the Severnaya Dvina River mouth (White Sea) during the spring flood period |
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| Authors: | M D Kravchishina V P Shevchenko A S Filippov A N Novigatskii O M Dara T N Alekseeva V A Bobrov |
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| Institution: | 1.P.P. Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia;2.V.S. Sobolev Institute of Geology and Mineralogy, Siberian Division,Russian Academy of Sciences,Novosibirsk,Russia |
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| Abstract: | The grain-size and mineral composition of the suspended particulate matter (SPM) of the Severnaya Dvina River mouth is studied,
as well as the content of several lithogenic elements in the SPM during the spring flood in May 2004. The data published on
the composition of the riverine SPM in the White Sea basin are very poor. The spring flood period when more than half of the
annual runoff is supplied from the river to the sea in a short time is understood more poorly. The report considers the comparison
results for the grain-size compositions of the SPM and the bottom sediments. The data of laser and hydraulic techniques of
the grain-size analysis are compared. The short-period variations of the SPM concentration and composition representing two
diurnal peaks of the tide level are studied. It is found that the SPM is mainly transferred during the spring flood as mineral
aggregates up to 40 μm diameter. The sandysilty fraction of the riverine SPM settles in the delta branches and channels, and
the bulk of the fine pelitic matter is supplied to the sea. The mineral and chemical composition of the Severnaya Dvina River
SPM is determined by the supply of substances from the drainage basin. This substance is subjected to intense mechanic separation
during the transfer to the sea. The key regularities of the formation of the mineral composition of the SPM during the flood
time are revealed. The effect of the grain-size composition of the SPM on the distribution of the minerals and elements studied
in the dynamic system of the river mouth are characterized. |
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