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Lagrangian drift experiment on the Middle Daugava River (Latvia) during the filling phase of the spring floods

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The 2nd real-time Lagrangian drift experiment within the river-floodplain system of the Middle Daugava (South-East Latvia) was conducted on April 8, 2010, by applying a drifting sampling platform (a maritime life-raft) and a Lagrangian sampling strategy. Repeated measurements of the water temperature, pH, oxidation-reduction potential, conductivity, turbidity, dissolved oxygen concentration and the chlorophyll-a concentration were performed at a depth of 0.5 m with a 30 min frequency. In addition, a subsurface sampling of the zooplankton was performed hourly by applying standard methods. Repeated measurements of the Secchi depth, the drift speed and the river depth were also performed in-situ.

The drift was started at 08:00, 10 km upstream from Daugavpils and finished at 19:00, 62 km further downstream. During the drift, 23 series of in-situ measurements were performed and 11 zooplankton samples were collected. The Spearman's rank correlation and the Multivariate and Partial Mann-Kendall tests were applied to the selected variables to identify statistically significant downstream trends as well as their correlation with the drift speed and river depth.

Significant downstream trends were observed for the drift speed, the Secchi depth, turbidity, temperature, pH, conductivity and the dissolved oxygen. Most trends were different from those recorded during the drainage phase of floods (Gruberts et al. 2012). A possible impact of the drift speed on the chlorophyll-a concentration was detected. Downstream trends of other physical, chemical and biological parameters were independent from in-channel hydrological conditions. At 28.5 km downstream from Krauja, an abrupt shift in the Secchi depth indicated lateral interaction between the main channel and the adjacent floodplain area, which resulted in enrichment of the water column with suspended material and rotifers like Synchaeta sp. and Filinia longiseta.
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Keywords: DOWNSTREAM TRENDS; IN-SITU SAMPLING; LAGRANGIAN DRIFT EXPERIMENT; LATERAL INTERACTION; STAGNANT FLOODWATERS; ZOOPLANKTON RECRUITMENT

Document Type: Research Article

Publication date: June 1, 2014

More about this publication?
  • Fundamental and Applied Limnology is an international journal for freshwater research in the widest sense, including problems of marine biology and brackish water research. Papers dealing with ecological topics are especially welcome in association with experimental or physiological studies. All papers published in this journal are subject to peer review.

    Archiv für Hydrobiologie, now Fundamental and Applied Limnology has been published continuously since 1906.

    Volumes prior to vol. 168 were published under the previous title Archiv für Hydrobiologie.
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