Hidrológiai Közlöny 1971 (51. évfolyam)

1. szám - Kolin László: A vízminőség szerepe és változásai tározókban

Special Conference Number, Szebellédy, L. Hidrológiai Közlöny 1971. 1. sz. 57 Fig. 3. Flow conditions in a single-compartment, circular storage basin of 1000 cu. m capacity A flow-through basin of rectangular plan and 2 X500 cu.m. capacity is shown in Fig. 1. Thanks to the favourable arrangement in plan, relatively little stagnation occurs in the pláne of flow. As demonstrated alsó by experiments abroad, for instance the paper by Langer, in basins divided in this manner by a baffle, where the length to width ratio is around 4:1, favourable flow conditions may be expected to develop. A double-chamber, flow-through type basin of 1000 cu.m capacity, with circular plan is shown in Fig. 2. The incoming discharge is divided among the outer and inner compartments. In the pláne of flow, the movement of water is practically uniform m the outer compartment and no stagnation areas can be observed. In the inner compartment, however, no uniform flow is developed, even with a baffle, 011 the two sides of which, as well as on both sides of the basin large areas of stagnation occur. These in turn may adversely affect the quality of stored water. A similarly circular, but single chamber basin of 1000 cu.m capacity is illustrated in Fig. 3, involving no baffle wall. The inlet pipe in the flow-through system basin is extended to the opposite side, still it should be obvious that no pattern of flow is possible that would eliminate aeras of stagnation and ensure perfect water exchange in the basin. Fig. 4 illustrates a four-compartment pressure tank. The pipe arrangement is in principle identical with that in the foregoing figure and neither here does it result in a satisfactory flow pattern. A polygonal storage basin of the flow-through system, with baffle walls, is shown in Fig. 5. Essentially the baffle walls turn the basin into a labyrinth passage, in which —at least in the inlet and outiét planes—fairlv uniform flow conditions Fig. 4. Flow conditions in square storage basins of 4X5000 cu. m capacity Fig. 5. Flow conditions in a polygonal storage basin of (2X ) 1500 cu. m capacity prevail. Stagnation areas are small and few. Of fundamental importance with this tvpe of basin is that owing to the baffle walls every entering water partiele is forced to travel the entire length of the passage within the basin to arrive at the outiét pipe. Reviewing the types of basin commonly appliedin Hungary it seems permissible to conclude that although definite efforts have been done towards