Vízügyi Közlemények, 1969 (51. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(17) All tliis should be regarded as evidence for the importance of aerial photography in karstic water research, the application of which is expected to result in a considerable saving of both time and costs. It should be noted further, that aerial photographs taken with an inclined axis and field reconnaissance are important methods lor checking the information gained by the interpretation. llltlllF PUBLICATIONS AMI REPORTS I. Dr. Kezeli, Árpád: Construction of a barrage in the nioulli of (lie Eider River (For the Hungarian text see pp. 110 ) Based on personal experience a brief accounl is given on the construction of Lhc Eider barrage (Figs. 1 and 2) closing the mouth of the Eider River (Schleswig-Holstein, Federal Republic of Germany). The barrage is constructed within the program of levee construction, levee reinforcement and shore protection, intended to offer protection against destructive flooding similar to those caused by the high spring tides in 1902 along the shores of the North Sea. The purpose of the barrage is to prevent the entrance of tides into Lhc mouth of the Eider River, and to offer protection to 200 thousand hectares of Eider-land. The closure, incorporating a weir and a navigation lock will further improve the estuary of the Eider and Freene Rivers, as well as navigation on the Eider River. The closure, which was designed alter five years of preliminary studies and detailed explorations, will intersect the main current line of the river at right angles across the Katinget Watt. The length of the levee is 4.8 km, at a crest elevation of 8.5 m above NN (normal zero). Л cross section through the sand-fill levee is shown in Fig. 4. The rockl'ill slope filled with Colcrete mortar on the seaward side is shown in Fig. 5, while the toe of the slope, covered by a layer of bituminous sand on the riverside of the levee is shown in Fig. 6. The closing organs, the navigation lock and the movable weir are located on the southern part. Л construction site („Bauinsel") 500 m long and 580 m wide has been enclosed for building the lock and the movable weir (Figs. 3 and 11 ). The construction site is connectcd with the main land by the transporting bridge (Fig. 7). In the construction site surrounded by a ring levee the groundwater level has been lowered with llie help of 10 large diameter (filter diameter = 1.0 m) wells sunk to 14 m depth. Further wells were necessary for lowering the groundwater table in the construction pits for the piers of the movable weir. The vacuum-well method has been adopted l'or this purpose. The movable weir (Fig. 0) will transmit flow in two directions through sector gates. The 2 m thick foundation slab is supported on piles driven partly to a 1.0 on 1 batter, partly vertically. The piles consist of steel pipes of 560 mm diameter and 11.1 mm wall thickness ( Fig. 10). Each pier will be supported on 68 piles, the heads of which will be encased after driving into a common pile cap (Fig. 8). llazslinszky, Tamás; Garden Architect: Landscaping along surface waters (For the Hungarian text see pp. 120) Landscaping is understood as the regular maintenance and enhancement of natural values, the biological equilibrium of the landscape. Its responsibilities include the control of runoff conditions, the shaping of the channel, biological measures, maintenance and care of vegetation for bank protection. The role of the latter function, i. e. biological bank protection is of especial importance. Biological bank protection offers a number of advantages, among these cheapness, ability for sell' purification and casting of shadow. Adverse effects are mainly due to improper plantation and care (runoff obstacles, leaf accumulation, etc.). This method is widely adopted and practiced by hydraulic engineers in East- and West Germany, in Austria and Switzerland. The first international symposium on this subject was held in 1967 in Erfurt (German Democratic Republic). The method of bank surveying has been developed in recent years and surv ey data have been grouped into four categories, namely bank morphology, degree of