JP2726817B2 - A tidal current generator using the ocean sky - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for generating a tidal current due to a change in tide at an estuary or the like. 2. Description of the Related Art The estuary of a river forms a delta and expands, the flow velocity decreases, sediment accumulates, the water depth becomes shallow, and the river is closed by drifting sand. For this reason, the channel width and waterway have been secured by dredging and dike to secure the channel and discharge channel. [Problems to be Solved by the Invention] The opening of a river has a shallow depth of water, especially when there is interference, so that it becomes difficult to sail a ship or the like or to fish up. If the channel is narrowed by a dike, the river will be raised upstream of the river and the water level will rise. [Means to solve the problem] (The hollow is the surrounding water area surrounded by the embankment structure.) The flow is caused by the change in tide level and the amount of water in the estuary is increased, so that the tractive force at the estuary is increased. The aim is to increase the river bed depth and make the navigation of ships easier. [Effect] A phase shift occurs between the change in the tide level of the open sea in FIG. Utilizing such a time lag, the tidal current 8 or between the open sea 3 and the inland waters
By generating 10 to increase the river flow 7 in addition to the flow 6 of the river's own water volume, it is intended to increase the tractive force. Embodiments The following embodiments of the present invention will be described with reference to FIGS. 1 to 4. FIG. <Open-type tidal current generator> A tidal current generator in which a hollow water area 2 surrounded by a bank 1 shown in FIG. 1 is formed in a water area having a fluctuation in water level, and the hollow water area is opened by a water channel. This is an open-type tidal current generator in which the waterway opening 13 is opened in a river water area having a tidal difference upstream of the river. Such a tidal current generator is also referred to as an open run-up waterway. The structure of the embankment body 1 is a continuous levee embankment, a concrete block embankment, a concrete caisson embankment, and a sheet pile embankment. A levee structure constructed to open in a certain water area. <Closed-type tidal current generator> A closed-type tidal current generator shown in FIG. 2 extending and installed along a seawall 4 in a river water area having a tidal difference in a water area having a fluctuation in water level. . Such a device is also called a closed run-up waterway. The structure of the permeation levee 5 is a known rubble levee, concrete block levee, sand basket, futon car, or the like, and is a transmission type continuous levee structure having multiple voids. [Effect of the Invention] The shortage of the specific water amount 6 of the river is compensated, and the flushing effect of the sediment deposited on the river is enhanced. Since the tide is generated by the energy of the tide, the effect is great during the drought period of the river. The direction 7 of the ebb tide and the direction 8 of the ebb tide in FIG. 1 always flow in the opposite direction to the main flow at normal times, so that the ship can travel without waiting for the tide. Using the energy of the tidal range to secure the water volume at the estuary, there is no influence from the rising of the river, and the effect of removing inland water is great. Since the width of the channel is limited by the embankment body 1 or 5, it is possible to secure the water depth and the flow velocity, and to increase the safety of the channel and the sweeping power of the earth and sand. Further, it is possible to sweep sedimentary sediment offshore, which is relatively unaffected by waves, and has a relatively deep water depth. In particular, the run-up channel with a permeation dike has a large effect of purifying the inflowing river by the catalytic oxidation action.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an open type tidal current generator. FIG. 2 is a plan view of a closed type tidal current generator. FIG. 3 is a graph showing a temporal phase shift between the inside and outside tide levels. FIG. 4 is a cross-sectional view taken along the line C-C. FIG. 4- (1) shows a state at the time of ebb tide (a state in which a tidal current is generated from inside to outside the valley), and FIG. Fig. 4-(3) shows the state at the time of rising tide (state in which a tidal current is generated from the outside to the inside of the basin) 1: The embankment constituting the basin 2: The water area inside the basin 3: The water area outside the basin (open ocean) 4: Revetment 5: Transparent embankment that constitutes the valley 6: Unique water flow of the river 7: Tide flow of water in the valley out of the ridge due to ebb tide 8: Tide flow flowing into the valley through the water channel due to the upper tide 9: Tidal current in the main estuary due to ebb tide 10: Tidal current in the main estuary due to upper tide 11: Temporal change of tide level generated outside the valley (open ocean) Figure 12: Temporal change of tide level generated in the valley

Claims (1)

(57) [Claims] A tidal current generator using "oceanic valley", characterized by opening a hollow water area 2 enclosed and closed by an embankment body 1 in a water area having a tidal difference. 2. A tidal current generator using the "oceanic seaside" according to claim 1, wherein the waterway opening 13 is extended in a waterway shape toward the upstream and opened in a river water area having a tidal level difference. Tidal current generator using 3. In the water area with a tidal difference, a hollow water area 2 surrounded and closed by a seepage dike 5 is formed, and this water area is extended to a river water area with a tidal difference.
Tidal current generator using