Transportmechanismen von Oel in natürlichen Gewässern unter besonderer Berücksichtigung von Sedimentations- und Flotationsbedingungen bei der Heterokoagulation von kolloidalen Oeltröpfchen mit mineralischen Schwebstoffen
Naturwissenschaftliche Untersuchungen : Untersuchungen über den Einfluss erhöhter Kupferkonzentrationen auf die Wechselwirkungen zwischen Algen, Bakterien und gelösten organischen Algenexkreten : gesellschaftswissenschaftliche Untersuchungen: Arbeiten zum
The following report represents a condensed summary and synthesis of the Regional Project of the Cooperative Programme on Eutrophication sponsored by OECD with the cooperation of 18 countries. Programe development and guidance have been the responsibility of a Technical Bureau composed of the regional programe leaders and other experts.
Turbidites and varves in Lake Brienz (Switzerland): Deposition of clastic detritus by density currents
Lake Brienz is a 14 km long and 261 m deep oligotrophic valley lake which lies in the front range of the Swiss Alps. Sedimentation is entirely clastic and is dominated by two rivers which enter the lake at opposite ends. The sediment load is transported and deposited in the lake by overflows, interflows (low- and high -density turbidity currents) depending on the density difference between river and lake water. Whereas high-density turbidity currents, which deposit up to 150 cm-thick graded sand layers, occur only once or twice per century after catastrophic flooding, low-density turbidity currents occur annually during periods of high discharge and deposit centimetre-thick faintly graded sand layers. Fine grained sediment supply by overflows and interflows rains down continuously during summer thermal stratification to from the dark-grey summer half-couplet of a varve; at turnover in the autumn the remaining sediment trapped at the thermocline settles out and forms the light-grey winter layer.