Water intake method of dam lake

Abstract

To provide a water intake method of a dam lake capable of clarification of effluents from the dam lake.SOLUTION: In a water intake method of a dam lake, at least one of lateral face sides of a selective water intake port of a dam is provided with a partition wall, toward an upstream direction of the selective water intake port, a membrane-type turbidity prevention body is stretched between the partition wall and another partition wall or a dam wall so as to surround the selective water intake port, and water intake is run from the selective water intake port surrounded by the membrane-type turbidity prevention body.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a method for taking water from a selective intake of a dam lake. [Background technology]

[0002] Traditionally, dam lakes have been constructed to generate electricity or when there is a shortage of water for use in downstream rivers. Generally, dam lakes have warm water near the surface and cold water at the bottom. Heavy rains and other events can also cause temporarily turbid water to flow into the dam near the surface. Selective water withdrawal is used to appropriately extract water that varies in temperature and turbidity depending on the depth, depending on the downstream environment and purpose. In other words, in order to minimize the impact on the natural ecosystem of downstream rivers due to changes in water temperature and turbidity, the dam lake's water intake position is adjusted and selective water intake systems are installed that allow clean water of the appropriate temperature to flow downstream. Summary of the Invention [Problem to be solved by the invention]

[0003] However, one problem with water intake from a dam lake is the turbidity of the water when it is taken in. This problem occurs especially when a large amount of water is taken in over a short period of time. The present inventors have conducted extensive research to solve these problems and have completed the present invention. [Means for solving the problem]

[0004] In other words, the present invention is a method of taking water from a dam lake, in which a partition wall is provided on at least one side of the dam's selective intake facing upstream of the selective intake, a membrane-like pollution prevention body is extended between the partition wall and the other partition wall or the dam wall to surround the selective intake, and water is taken from the selective intake surrounded by the membrane-like pollution prevention body. [Effects of the Invention]

[0005] According to the method of the present invention, even when a large amount of water, such as 10 tons per second, is taken from a dam lake, there is no impact on the natural ecosystem of downstream rivers due to turbidity. [Brief explanation of the drawings]

[0006] [Figure 1] An enlarged plan view of a portion near the selective intake of the dam lake. [Figure 2] FIG. 10 is a partially enlarged plan view of the vicinity of the selective intake of a dam lake of another embodiment. [Figure 3] FIG. 10 is a partially enlarged plan view of the vicinity of the selective intake of a dam lake of another embodiment. [Figure 4] FIG. 10 is a partially enlarged plan view of the vicinity of the selective intake of a dam lake of another embodiment. [Figure 5] FIG. 10 is a partially enlarged plan view of the vicinity of the selective intake of a dam lake of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] Figure 1 is an enlarged plan view of a portion of the dam lake near the selective intake, where 1 is the selective intake, 2 is the flood discharge outlet, and 3 is the dam lake wall. In the present invention, a bulkhead 3 is provided on the side wall of a selective intake section 1 of a dam, facing the upstream direction of the selective intake section 1. In another embodiment, a bulkhead 4 can be provided on the other side of the selective intake section 1, similar to the bulkhead 3, as shown in Figure 2. The bulkheads 3 and 4 may have different lengths in the upstream direction, as shown in Figure 2, or may have the same length (not shown). The bulkheads 3 and 4 can be made of either concrete or iron, and are preferably erected from the bottom of the water.

[0008] Next, in the present invention, as shown in FIG. 3, membrane-like pollution prevention bodies 5 are spread in multiple layers between the partition walls 3 and 4, for example, in a grid pattern. The film-like pollution control body 5 used in the present invention is, as shown in FIG. 4, a film body 6 in the form of a sheet or mesh suspended from a float 7 having a rope insertion hole.

[0009] In another embodiment, as shown in Figure 5, membrane pollution prevention bodies 5 are deployed in a fan-like fashion between the bulkhead 3 and the dam wall 8. In order to maintain the deployed form when the membrane pollution prevention bodies 5 are deployed in a multi-fold manner, it is preferable to deploy them in a compartmentalized manner. Furthermore, by fixing the membrane pollution prevention bodies 5 to anchors 11 with ropes 10 or the like from the vertical direction from floats 9, the multi-fold deployed form can be maintained even when the flow rate increases. [Explanation of symbols]

[0010] 3...bulkhead 5. Membrane-type pollution prevention body 8. Dam wall

Claims

[Claim 1] A method of taking water from a dam lake, characterized in that a partition wall is provided on at least one side of a selective intake of a dam facing upstream of the selective intake, a membrane-like pollution prevention body is extended between the partition wall and the other partition wall or the dam wall so as to surround the selective intake, and water is taken from the selective intake surrounded by the membrane-like pollution prevention body.

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