Sediment-water exchange in Lake Grevelingen under different environmental conditions
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, more
Related to:Kelderman, P. (1985). Sediment-water exchange in Lake Grevelingen under different environmental conditions, in: Kelderman, P. Nutrient dynamics in the sediment of Lake Grevelingen (SW Netherlands). pp. 26-51, more
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| Abstract |
The impact of various environmental factors on the phosphate and silicate sediment-water exchange in Lake Grevelingen has been investigated in a series of laboratory experiments under aerobic conditions. Silicate mobilization from the sediment showed a strong temperature dependence, with fluxes ranging from 5 ± 3.2 mg Si·m−2·d−1 at 5°C to 85 ± 18 mg Si·m−2·d−1 at 20°C. Phosphate mobilization fluxes ranged from 0.5 ± 0.7 mg PO4-P·m−2·d−1 at 5°C to 11 ± 3.4 mg P·m−2·d−1 at 20°C.The phosphate exchange fluxes showed a significantly linear negative correlation with the phosphate concentrations in the overlying water, in accordance with Fick's first law of diffusion. High P accumulation rates into the sediment were especially found at low water temperatures. Resuspension of the upper sediment layer was shown to enhance these P accumulation rates even more. Based on the results of four different sediment types, general relationships have been derived for the phosphate sediment-water exchange as a function of water temperature and phosphate concentration in Lake Grevelingen. The results have successfully been applied in a simulation model for the phosphate concentration in Lake Grevelingen over the years 1974–1977. |
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