Vízügyi Közlemények, 1965 (47. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

<89) equip the weirs and power stations with special closure devices of permanent or temporary character, respectively. 3. Scour phenomena in the surroundings of hydraulic structures. Reviewed by Ö. Starosolszky after G. L. Smith. (For the Hungarian text see pp. 421) The extent of scour occurring in the surroundings of hydraulic structures depends on the kinetic energy, as well as on characteristics of the stream bed material. A number of laws have been determined by Rouse, Doddiah, Thomas, Hallmark, Albertson and Smith concerning scour processes. Factors and interrelations affecting backwash phenomena have been ascertained by Smith in experimental way. He gave also experimental coefficients both for calculating and preventing scour processes. The exponential law of scour, related to maximum depth and time-dependent change, has also been verified by experiments performed in Delft and Padova. 4. New navigation locks on the Dunkerque-Valenciennes l'anal. Reviewed by Gy. Kontur after Claudon, I. G. and Thiboult, B. (For the Hungarian text see pp. 426) The quick development of the Dunkerque Port and in the adjoining industrial area necessitated the navigation canal of Northern France being modernized. The new ship locks, having a useful surface of 144.6 Xl2 m, are suited for receiving pushboats of 3000 tons. There are three ship locks completed so far: Douai, Courchelettes and Pont-Malin.