JP3964010B2 - Dam structure - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a dam structure, and more particularly, to a dam structure in which a bank body and a reservoir are provided at a location deviating from a river main stream.
[0002]
[Prior art]
In the conventional basic dam structure, in order to create a reservoir by blocking the river mainstream with a dam body, the dam body or reservoir divides the river mainstream into an upstream part and a downstream part. While production increased and sedimentation progressed, there were problems such as the sediment flow rate or nutrients decreased in the downstream area, and the ecological exchange between the upstream and downstream areas was interrupted.
[0003]
As a solution to the above problems, Japanese Patent Application Laid-Open No. 5-179631 discloses that the upstream and downstream parts of the river main stream are bypassed and always communicated, such as sediments and fishes. A dam structure with a bypass tunnel (including diversion of a temporary drainage tunnel) that allows the above is proposed.
[0004]
[Problems to be solved by the invention]
However, even the dam structure disclosed in the above publication is the same as the conventional dam structure in that the river mainstream is dammed with the dam body, so the occurrence of evacuees due to submergence, environmental problems, or river mainstream navigation・ Currently, problems such as loss of water transport function remain, and the dam development side and river protection side are always in conflict.
[0005]
The present invention has been made in view of the above problems, and its purpose is to eliminate submergence in the mainstream of the river and to preserve various functions such as navigation and water transportation that the river mainstream originally has. It is to provide a dam structure that can antagonize the conflict between the dam development side and the river protection side.
[0006]
[Means for Solving the Problems]
The dam structure according to the present invention is provided with a reservoir in which river water taken from a river mainstream intake through a water conduit is blocked by a dam body, and the dam body and the reservoir are provided at a location outside the river mainstream . In the dam structure, a water discharge channel leading to the river main stream upstream from the dam body is provided, and a water discharge point of the water discharge channel is provided in the vicinity of the water intake .
[0007]
In other words, the dam structure according to the present invention is provided with a bank body and a reservoir that is blocked by the bank body and that takes in and discharges river water from the river main stream at a location outside the river main stream. The river water is supplied and stored through a water conduit (including a water conduit).
[0008]
“Locations that deviate from the river mainstream” are locations other than the river mainstream that do not impair the navigation / water transport functions of the river mainstream and the functions that do not prevent free upstream and downstream movement of the ecosystem. E.g. certain lowlands, depressions or river tributaries in the vicinity of the river main stream, which meet the necessary and appropriate requirements for functioning as a reservoir, and the irreversible effects of submergence are not significant, evicted residents with submergence It is desirable to select a location that minimizes as much as possible.
[0009]
In the present invention, the dam body and the reservoir can be provided in the river main stream in the same manner as the conventional dam structure, and even if this is technically and economically advantageous, it is located at a position other than the river main stream. By installing dams, the dam development side who wants to gain the benefits of water utilization and power generation by installing dams in the river mainstream and the use of river mainstream navigation and water transport functions and ecosystems A new solution can be given as an intermediate technique between the river protection side who wants to preserve the maintenance function.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0011]
FIG. 1 is an explanatory view schematically showing an example in which a dam body 10 and a reservoir 11 are provided in a river tributary 2 flowing into a river main stream 1 as an example of a dam structure according to the present invention. The levee body 10 is constructed in such a manner as to dam the branch 2 at the inlet of the river branch 2 with respect to the river main stream 1. For the branch 2, the intake 12 ′ is branched into the main stream 1 and the outlet 12 ″ is branched into the main stream 1. The river water of the main stream 1 is supplied and stored by the natural flow through the water conduit 12 provided in 2, thereby creating a reservoir 11 whose flood surface is represented by a broken line with a reference number 11 ′.
[0012]
Further, when the river water of the reservoir 11 used for power generation or the like is discharged into the river main stream 1, the water discharge path 13 is led from the dam body 10 along the main stream 1 to the upstream side, thereby the water intake 12 ′ which is a water intake point. The distance between the water intake point and the water discharge point is appropriately changed according to the gradient of the river main stream 1 such that the distance from the water discharge point 13 ′ is shortened and the decrease or depletion of the flow rate is prevented.
[0013]
Furthermore, when performing power generation, etc., the ratio of the flow rate of the river main stream 1 and the amount of water for power generation is set in advance so that the original functions of the river main stream 1 are not impaired. Do not give.
[0014]
【The invention's effect】
As described above, in the dam structure according to the present invention, since the river mainstream cannot be blocked by providing the dam body and the reservoir at a location outside the river mainstream, submergence and eviction of the river mainstream are eliminated. In addition, navigation and water transport functions inherent in river mainstreams and functions that do not interfere with movements such as free upstream and downstream movements of the ecosystem can be preserved. New solutions can be given to the river protection side.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing an example in which a bank body and a reservoir are provided in a river tributary that flows into a river main stream as an example of a dam structure according to the present invention.
[Explanation of symbols]
1 river main stream 2 river tributary 3 pressure compensation water tank 10 dam body 11 reservoir 12 conduit 12 'intake (intake point)
12 "Water outlet 13 Water outlet 13 'Water discharge point

Claims (1)

The accepted river water from the water inlet of the river mainstream through a water conduit provided with a damming was reservoirs by embankment, in dam structure provided with the dam body and the reservoir at a position disengaged from the river main stream, from the embankment A dam structure characterized in that a water discharge channel leading to the upstream river main stream is provided, and a water discharge point of the water discharge channel is provided in the vicinity of the water intake .

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