Vízügyi Közlemények, 1966 (48. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(101) 7. The method of flow through studies can be applied generally to all reactors of continuous operation, but efficiencies and parameters characteristic for the process must be determined for each particular case (with due consideration to the type of installation). 8. The flow through curve should preferably be written into a mathematical form, since mathematical methods offer added information about the nature of the hydraulic phenomenon represented by the curve. EXPERIENCES OF MODEL TESTS ON HYDRAULIC STRUCTURES Őermak, Zd. and Klapetek, Fr. Civ. Engrs (Brno) (For the Hungarian text see pp. 505) Loads acting on pipes passing through embankments, as well as actual stress distributions within the structure are expediently determined by structural model tests. Loads were determined in a sand model (Figs. 1 to 4), the distribution of stresses in a direct plane model of the Beggs type (Figs. 6 to 9), in a photoelastie model ( Figs. 10 to 14) and with the help of electric analogy ( Figs. IS, 16). BRIEF PUBLICATIONS AND REPORTS 1. Karbaum, H. : Civ. Engr.: Determination of discharge in weed-overgrown channels (For the Hungarian text see pp. 519) In Mecklenburg District of the German Democratic Republic flat watercourses are overgrown with weeds to different extents. As a consequence highest stages may be associated with smallest discharge ( Fig. 1 ). For determining the retardance caused by weed growth the only available method consists of discharge measurement. Results thereof lie in the narrow band above the rating curve pertaining to weedfree conditions (Fig. 2). A set of curves can be traced with difficulty only (Fig. 3). For the regular recording of discharge in weed overgrown watercourses a reduction curve determined from discharge measurements is recommended. The degree of flow retardance varies from year to year ( Fig. 5) and 1 he effect of weed control measures on the bed is always observable (Fig. 4). Data for the Klempenow gaging section on the Tollense River are introduced as an example. 2. Zsuffa, I., Civ. Engr.: Developments in the exploration of storage opportunities in hilly country (For the Hungarian text see pp. 525) In the exploration of storage opportunities in Hungary [1] reservoir sites permitting storage of over 1 million eu. m have only been considered. Instead of particular studies, profile surveys of individual valleys and watercourses may be suggested. This is facilitated by the storage profile (Figs. 1 to 3), which can be resolved into three parts. In Fig. 1 the profile of catchment areas is represented above the geological valley profile, Fig. 2. indicates the profile for determining storage volume (utilization, or flood retention), while in Fig. 3 the profile containing morphological data (dam height-volume, surface and crest length relationships) is indicated. The use of these figures is illustrated by the numerical example indicated by the dashed line. On the basis of the above data the profile of costs (Fig. 4) can be prepared for deciding the most economic engineering alternative. :S. Szilágyi. L., Civ. Engr.: Use of plastic foil for seawall contsruction along Lake Balaton (For the Hungarian text see pp. 532) On the South-Eastern shore of Lake Balaton beach erosion is controlled by the construction of sea-walls which are backfilled by the hydraulic fill method. Some of the backfill material escaped through the voids of rockfill, while backfilling with earth proved too costly and cumbersome (Fig. 1). An attempt was made at sealing 5)»