Partikelgrössenverteilung und Natürliche Koagulation im Zürichsee |
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| Authors: | Dr Gertrud K Osman-Sigg Prof Dr Werner Stumm |
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| Institution: | 1. Institut für Gew?sserschutz und Wassertechnologie, ETH Zürich und EAWAG Dübendorf, CH-8600, Dübendorf, Switzerland
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| Abstract: | The size distribution of suspended particles in Lake Zürich water shows always the same shape, irrespective of the total concentration of particles, depth or season. The particle size distribution can be described by a function of the form $$\frac{{\Delta {\rm N}(d_p )}}{{\Delta d_p }} = n(d_p ) = {\rm A}d_p^{ - m} $$ where N (dp)=concentration of particles with diameters between dp and dp+Δdp cm?3], dp=particle diameter μm], A=constant of the particle size distribution, n(dp)=particle size distribution function. m was found to be about 3.5. Model calculations show that coagulation determines the particle size distribution. The lake model consists in three completely mixed parts: the epilimnion, the thermocline and the hypolimnion. The effect of outflow of particles by a river, sedimentation and coagulation on the particle size distribution were investigated. |
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