JPH0431501A - Floating wave dissipation levee - Google Patents

Abstract

PURPOSE:To obtain the effect of accurate wave dissipation by arranging a plurality of levee bodies in parallel along in the approach direction of waves, and setting a water line width of each of the levee bodies so that it is widened downward of waves. CONSTITUTION:A large number of levee bodies 1 as floating bodies are arranged in approximately parallel with one another so that they parallel in the approach direction 2 of waves, and each of the levee bodies 1 is bound with a mooring rope and sinker. A water line width of each of the levee bodies 1 is so set that it is widened downward of waves as a whole, and an average water line width to 1/3 of the length of each of the levee bodies to the front from the rear end downward of waves of the levee bodies 1 is set to more than 1.5 times of an average water line width to 1/3 of the length of each of the levee bodies to the rear from the front end upward of waves of the levee bodies 1. The central position 5 of each of the levee bodies 1 is set within a range of 20 - 40% of the length of each of the levee bodies to the front from the rear end of the levee bodies 1. Wave cause one levee body 1 to give a pitch, a mutual interference of a rolling 3 brought about by the other levee body 1 adjacent to one levee body 1 is greatly made, and approach waves are effectively disturbed to make wave dissipation operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wave-dissipating levee installed offshore of a port, and particularly to a floating wave-dissipating levee constituted by a plurality of levee bodies serving as floating bodies.

[Conventional technology]

Figure 9 (
There is a type of embankment as shown in the plan view), in which a plurality of embankment bodies 01 as floating bodies are arranged so that their longitudinal directions are along the wave ingress direction 02, and the embankment bodies 01 are spaced apart from each other at regular intervals. A mooring rope 03 and a sinker 04 are used as restraint means for maintaining the ship.

FIG. 10 is a side view of the embankment body 01, and movements such as pitching 07 of the embankment body 01 occur as the wave surface 06 changes.

With this movement of the embankment body 01, a transverse wave is generated in the wave direction 05 shown in FIG. The wave-dissipating effect is achieved by consuming the energy of the waves that enter the area.

[Problem to be solved by the invention]

By the way, the reason why the floating wave breakers that have been developed so far as described above have not been realized as a practical device is that wave dissipation occurs only in the wavelength range of the incoming wave where the movement of the breakwater body 01, that is, the pitching is the largest. This is because although it has excellent performance, it has almost no wave-dissipating effect on waves in other wavelength ranges, which is a disadvantageous characteristic when installed in actual sea areas where incoming waves of various wavelengths occur.

The present invention aims to solve such problems, and with respect to a plurality of embankments arranged parallel to incoming waves,
The purpose is to provide a floating wave levee that can accurately obtain a wave-dissipating effect regardless of the length of the wavelength of the incoming wave by improving each shape and appropriately setting the center of gravity. .

[Means to solve the problem]

In order to achieve the above-mentioned object, the floating wave bank of the present invention includes a plurality of bank bodies as floating bodies, and these bank bodies are arranged substantially parallel to each other so that the longitudinal direction of each bank body is along the wave ingress direction. The waterline width of the levee body is set so that it becomes wider toward the wave side as a whole, and the average waterline width from the rear end of the levee body on the wave F side to the front end of the levee body length is 173. is set to be more than 1.5 times the average water line width in 173 towns of the length of the levee body from the front end of the wave side to the rear of the levee body, and the center of gravity of the levee body is set at the rear end of the levee body. 2 of the embankment length from the end to the front
It is characterized by being set within a range of 0 to 40%.

[For production]

In the above-mentioned floating wavebank of the present invention, in the incoming wave,
Since the levee body moves approximately around its center of gravity, the center of gravity is located at the rear of the levee body on the wave side, causing the levee body to move vertically in a manner that causes the front and rear ends of the levee body to lower alternately. The relative motion with the incoming wave increases near the front end of the embankment body.

In other words, the nJ function effectively disturbs the waves near where the waves begin to enter.

Since the average water line width of the levee body is larger at the rear of the levee body on the wave side, waves with relatively short wavelengths are reflected at the part of the levee body where the water line width is wide. , the energy of waves attempting to pass between the embankment bodies can be effectively consumed.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
FIG. 1 is a plan view showing a part of a floating wave levee as a first embodiment of the present invention, in which a large number of levee bodies 1 as floating bodies have their longitudinal directions directed in the direction of wave intrusion from offshore. Each embankment body 1 is arranged substantially parallel to each other so as to be along the
It is restrained by mooring ropes and sinkers (not shown).

The water line width of each levee body 1 is set so as to become wider toward the wave side as a whole, and the average water line width from the rear end of the levee body 1 on the wave upper side to the levee body length 173 forward is as follows. Embankment body 1
The average waterline width from the front end on the wave side to 1/3 of the length of the levee body backwards is set to be at least 1.5 times that width.

Moreover, the center of gravity position 5 of each embankment body 1 is set to be within a range of 20 to 40% of the embankment body length from the rear end of the embankment body 1 to the front.

In the above-mentioned floating wave levee, each levee body 1 along the wave ingress direction 2 causes pitching around the center of gravity 5 set at the rear of the levee body as described above, so that the levee body 1 and the incoming wave The relative movement with respect to the levee body 1 becomes large near the front end of the embankment body 1. As a result, in the area where the waves begin to enter, the mutual interference between the transverse waves 3.3 generated from the adjacent embankments 1, 1 becomes significant, and as a result, it becomes possible to effectively disturb the incoming waves. The wave-dissipating action becomes more efficient.

In addition, as mentioned above, because the water line width gradually increases at the rear of the embankment on the wave side, it is possible to convert incoming waves with relatively short wavelengths into diagonally forward reflected waves indicated by reference numeral 4. By generating these reflected waves 4, the energy of waves attempting to pass between the embankment bodies 1 is effectively absorbed. This is how the wave-dissipating effect is carried out.

Note that it is considered that the center of gravity position 5 is preferably set as far back as possible. This is because by locating the center of gravity 5 as close to the rear of the wave side as possible, the relative movement between the bank body 1 and the wave on the wave side is increased, and the movement near the front end of the bank body where waves begin to enter is increased. This is because the collapse of the waves can be increased.

Furthermore, in the case shown in Fig. 1, the embankment body 1 is constricted into two stages, but the planar shape of the embankment body 1 is shown in Figs. 2(a) and (b).

The embankment body 1 may be formed as shown in each modification shown in FIG. The thing is shown in Figure 2 (e
), the planar shape of the embankment body 1 that changes in a curved shape is simplified by forming it by a combination of straight lines, and this makes it possible to set the center of gravity 5 further to the rear. Become.

3 to 5 show a form in which the buoyancy body part of the embankment body 1 corresponds to the entire embankment body including the bulge below the water surface 10, but the third embodiment of the present invention shown in FIGS. In the example, the buoyant body part 11
satisfies the requirements of the present invention as in the case of the first embodiment described above, and it has no buoyancy (that is, it has buoyancy as a member but does not form a buoyancy tank). It is provided with additional parts consisting of a water bottom surface section 14, a vertical wall surface section 12, and a reinforcing bracket 13 that connects them.

In the case of this third embodiment, while having the feature that the center of gravity position 5 is located at the rear, the shape of the embankment body is devised so that the disturbance imparted to the waves is as large as possible.

In this way, in each of the above-mentioned modifications and in the second and third embodiments, the water line width of the levee body is set to become wider as a whole toward the bottom of the wave, and the levee body The average width of the water line from the rear end on the underside of the wave to 173 of the levee body length forward is at least 1.5 times the average width of the water line from the front end of the levee on the underside of the wave to 173 of the levee body length backward. At the same time, the center of gravity of the levee body is moved forward from the rear end of the levee body by 2 times the length of the levee body.
By setting it within the range of 0 to 40%, as in the case of the first embodiment described above, the wave cancellation effect can be efficiently performed regardless of the length of the wavelength of the incoming wave. .

〔Effect of the invention〕

As described in detail above, according to the floating wave levee of the present invention, by improving the planar shape and setting of the center of gravity of each levee body, the wave-dissipating effect is achieved regardless of the length of the wavelength of the incoming wave from offshore. This has the advantage of making it possible to accurately carry out the process, and making it possible to install it in actual sea areas where incoming waves of various wavelengths occur.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a floating wave levee as a first embodiment of the present invention, and FIGS. 2(a), (b), and (c) all show modified examples of the levee body in the above embodiment. FIGS. 3 to 5 show a floating wavebank as a second embodiment of the present invention, FIG. 3 is a plan view thereof, and FIG. Fig. 5 is a cross-sectional view taken along the line ■-■ in Fig. 3, Figs. Its plan view, Fig. 7 is a sectional view taken along the ■-■ arrow in Fig. 6, Fig. 8 is a sectional view taken along the -■ arrow in Fig. 6, and Fig. 9.10 is a sectional view taken along the arrow ■-■ in Fig. 6. 9 is a plan view thereof, and FIG. 10 is a side view of the embankment body. 1... Embankment body, 2... Approach direction of incoming waves, 3.4...
・Waves generated from the embankment body, 5... Center of gravity position, 10...
・Water surface, 11... Buoyant body part, 12... Longitudinal wall part,
13... Reinforcement bracket, 14... Submerged bottom part. Agent Patent Attorney Yoshihiko Iinuma Figure 1 (b) Figure (C) Figure 02

Claims (1)

[Claims] A plurality of embankment bodies are provided as floating bodies, and these embankment bodies are arranged approximately parallel to each other so that their longitudinal directions are along the wave ingress direction, and the water line width of the embankment bodies as a whole is The average water line width is set to widen toward the bottom, and the average water line width from the rear end of the levee body on the wave side to the front up to 1/3 of the levee body length is Set to be at least 1.5 times the average water line width up to 1/3 of the body length, and the center of gravity of the bank body is within a range of 20 to 40% of the bank body length from the rear end of the bank body forward. A floating breakwater characterized by being set up as shown in the figure.