JPH11350463A - Device for protecting land from sea level rise by global warming gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the land from being submerged caused by a seat level rise by the earth warming gas. SOLUTION: Caissons 6 each storing a pump and a hydraulic turbine and an offshore weir 5 are installed in parallel with a beach on the sea side of the land 2 to be prevented from being submerged, and ponds 8 are formed by partition weirs 7 connected to the land 2. The water level of each pond 8 is invariably kept at the set water level 11 lower than that of the open sea 1 by several meters by the operation of the pump and water turbine, thus not only the submergence of the beach is avoided, but also the land area is expanded to the offing. The water level of the pond 8 is further lowered than the set water level by a pump operation during the ebb tide at night, and the sea water of the open sea 1 is introduced into the pond 8 by a water turbine operation to raise the water level to the set water level during the high tide in the daytime. A tide pumping power generating system is provided, a high-efficiency pumping power plant combined with the development of tidal energy and the normal pumping power generation is constructed, and economical efficiency is applied to the facility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tidal cutoff dam, a method of constructing a tidal pumping power generation system, and an apparatus therefor for the purpose of protecting land from sea level rise due to global warming gas.

[0002]

2. Description of the Related Art Held in Kyoto in December 1997,
Until the issue of sea-level rise in the 21st century was raised at the International Conference on Global Warming, the technology to protect land from sea-level rise was to raise seawalls. However, among the inventions of Japanese Patent Application No. 9-200818 (inventor Jin Kanno), it can be seen that the technology of the tidal pumping power generation system that is performed at the time of the tide in the bay at the tidal power generation site can be applied to the global coastline as a measure against sea level rise. Therefore, the present invention was carried out as an addition to the above invention.

[0003]

[Problems to be Solved by the Invention] During the 21st century, the sea level became 5
When it rises from 0 cm to 1 m, retreat of the shoreline is inevitable, causing a decrease in land area, loss of sandy beaches, and inundation into the zero meter zone. This is a serious problem especially in lowland countries such as the Netherlands, Bangladesh, and island nations at 1m above sea level.
The present invention, the seashore to protect from sea level rise, parallel to the coast, offshore dike installed offshore, and separated from the open sea by a partition dam connected to both ends of the coast at right angles to this,
By keeping the highest water level of the pond there a few meters below the average sea level of the open sea, for example, 3 m, it is possible to move the shoreline offshore, as opposed to retreating the shoreline. In this case, a caisson equipped with a pump-turbine that controls the water level of the pond is connected to an offshore weir, and tidal pumping and power generation with an efficiency of about 100% is performed using the water level difference between the open sea and the pond. In addition to protecting the coastline from rising sea levels, the development of synthetic energy will help expand the coastal area, simultaneously develop new energy and save energy, and help prevent global warming.

[0004] When the target coastline is long, the distance between the partition dams is kept within a range of several kilometers to 20 km. First, a pond is completed, the water level of the pond is lowered, and the tidal pumping station is operated. By adopting a construction method such as starting construction of the next pond, the aim is to plan economic construction while matching the relationship between the long-term construction period and the annual budget.

[0005]

In order to achieve the above object, all offshore and partition dams, including the caisson equipped with a pump-turbine, are composed of caisson, and the caisson manufactured in advance at the shipyard is towed to the site by a tugboat. Install after towing to shorten the construction period. Reinforce offshore dams as necessary.

Prior to the start of operation of the pump-turbine, the water level of the pond is previously lowered to a set value lower than the average sea level of the open sea by night pump operation, for example, by 3 m. After the start of operation, the pump performs the maximum output operation for 3 to 6 hours before and after the lowest tide time at night, and when the water level of the pond becomes lower than the set value by a specified value, for example, 2 m, As if you stopped driving. Next, during the daytime, the turbine is fully operated within 6 hours before and after the time when the tide level of the open sea reaches the highest level, and the turbine is stopped when the water level of the pond rises to the set value. In this case, the amount of water to be lifted and lowered by the operation of the pump and the water turbine is the same, and the head of the pump can be made smaller than the head of the water turbine, so that the nighttime pump operation energy can be reduced and the daytime waterwheel operation energy can be increased. , Pumping power generation efficiency can be increased to about 100%.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. In FIG. 1 and FIG. 3, it is assumed that there is a linear land 2 facing the ocean 1 where sea level rise is expected, and a seabed gradient 3-16 continues from the coastline 3 toward offshore. Water level 4 is the average high tide level at the time of the current tide,
Indicates the average maximum sea level before sea level rise. Offshore of the target land 2, almost parallel to the land, an offshore dam 5 is installed, and partition dams 7 are installed at both ends thereof, so as to be connected to the shoreline 3. One or two caissons 6 each containing a pump-water turbine 20 shown in FIG. 4 are connected to the offshore dam 5. Thus, a pond 8 is created between the ocean 1 and the land 2. This pond 8 is constructed as a unit for measures against sea level rise, and other pond
Construct 9, 9, etc. in the direction of the arrow. A sluice 37 is installed in the partition 7 to control water flow between adjacent ponds and to pass a small work boat. The highest water level 11 of the pond 8 in FIGS. 3 and 4 is lowered to the set water level by pump operation. As a result, the coastline C facing the pond 8 is shown in FIG.
It extends to offshore, and the land area has increased.
It is safe if the coastline 3 is buried offshore, as shown by the cross-section C-D of the land 2 in preparation for an emergency breach. The new land CDE can be used for multiple purposes. The pump-turbine 20 of FIG. 4 is mounted near the seabed in the caisson 6, and before and after it, a draft tube 21 and 2
2 is arranged. If, in the future, the sea level of the ocean 1 rises by 1 m to reach the dashed line 18, if the set water level 11 of the pond 8 is raised to the dashed line 19 1 m above, it is still safe enough and the head and head of the pump-turbine change. There will be no. The chain line 13 indicates the average water level of the pond and the length of one side that determines the effective average area of the pond. The embankment 36 is constructed for safety at the position D in FIG. 3 in accordance with the height of the sea level rise.

When the land 2 is an island, considering the coastline 3 in FIG. 1 as a curve, the coastline 3 of the island 2, the offshore dam 5, the caisson 6, the partition dam 7 in FIG. 3 and 4 can be used in common. The number of ponds 8, 9, and 10 surrounding the island 2 varies depending on the size of the island 2 and the length of the coastline 3.

[0009] The tide level, head,
The relationship between the head, the flow rate, the power and the energy will be described with reference to FIG. 5. The upper half of FIG.
One cycle of the tide, showing the relationship between 3 and time, is 12.4 hours. Because the tides rise and fall twice a day, there is always one low tide during the 12 hours at night and one high tide during the 12 hours during the day. In the lower part of FIG.
And the lowest water level 12. If the maximum power of the pump and the turbine is Lp, kW and Lt, kW, respectively, then Lp = Lt in terms of structure. The pump-water turbine uses a Kaplan type impeller, and the pump and the water wheel are operated at the maximum output regardless of the head and head during both the operation of the pump and the operation of the turbine. The head at the start of the pump operation is 24-25, 24 indicates the tide level, and 25 indicates the water level of the pond 8. The head at the end of the pump operation is 26-27. During this time, the tide level changes as 24-26, the water level of the pond 8 changes as 25-27, the operation time of the pump is 34, and the average head during that time is 32. Similarly, the start head of the turbine operation is 28-29, the end head is 30-31, the average head between them is 33, and the operation time of the turbine is 35. The average flow rates of both are Qp, m ³ / s, and
Qt, m ³ / s, average head 32 of the pump is Hp, m, average head 33 of the turbine is Ht, m, and the average efficiency of both is Fp and Ft. , Is as follows. Lp = K * Hp * Qp / Fp ----------------------- (1) Lt = K * Ht * Qt * Ft ----------------------- (2) Where K is a proportional constant and Lp = Lt, so Qp / Qt = (Ht / Hp) * Fm −−−−−−−−−−−−− (3) where Fm = Fp * Ft, If Ht / Hp = 1.5 and Fm = 0.7, Qp = 1.05 * Qt ----------------------- (4) However, the operating time of the pump to raise and lower the same amount of water and the operation of the turbine Since the time is inversely proportional to the respective flow rates, assuming that the operation time of the pump is Tp time and the operation time of the water turbine is Tt, Tt = 1.05 * Tp −−−−−−−−−−−−−−−− (5) The power consumption of the pump is Ep = Lp * Tp, kWh, the output power of the turbine is Et = Lt * Tt, kWh, and since Lp = Lt, Et / Ep = 1.05 −−−−−−−−−−−− −−−−− (6) In this case, pumped storage power generation efficiency is 105%.

[0010]

Since the present invention is configured as described above, it has the following effects.

The present invention has the effect of preventing seawater from entering the land and islands from rising sea levels due to global warming.

By always keeping the water level of the ponds 8, 9, 10 and the like lower than the water level of the open sea 1, there is an effect of expanding the area of the land 2 to the offshore side, that is, an effect of expanding the national land area.

A tidal pumped-storage power generation system having one pond 8 as one unit is constructed, and each pond 8, 9, 10, etc. has an efficiency of 1 unit.
It will be a pumped storage power plant with an efficiency of around 00%.

If necessary, one or several ponds may be reclaimed in whole or in part to make land development, for example, a seaside city,
Construction of marine airports, port facilities, fishing ports, industrial parks, leisure lands, agricultural land, etc. can be performed. In this case, it is possible to construct a tidal pumping station by constructing a pond similar to the previous one offshore.

The inside of the ponds 8, 9, 10, etc., is operated by a pump-turbine once a day so that the same seawater enters and exits at the time of flood tide, so that the seawater does not stagnate and contaminate, so it is suitable for aquaculture fishing. ing.

The offshore weir 5 has the effect of protecting the shore 2 from the tsunami of the earthquake. A similar effect can be obtained for storm surges during a typhoon.

By constantly lowering the water level of the pond, the drainage of the coastal land is improved, which has the effect of preventing salt damage.

The surface of the offshore dam and the partition dam are as follows:
Alternatively, the inside can be used for a motorway or railroad as a tunnel. In particular, since the power supply of the pumped storage power plant is wired along the bank, it is suitable for a new transportation system using electricity, such as a superconducting train and an unmanned train.

[0019]

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan view showing changes in coastlines along with a group of dams and tidal power ponds installed between straight shores for preventing submergence from the sea where sea level rise is expected.

FIG. 2 is a plan view when an island is protected from sea level rise.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, showing a change in the water level of the ocean 1 and the pond 8, a seabed gradient and a position of an offshore dam.

FIG. 4 is a cross-sectional view showing the relationship between the water levels of the sea side 1 and the pond side 8 of the caisson 6 and the state of the caisson with the pump-water turbine 20 mounted therein, taken along the line BB in FIG.

FIG. 5 shows the change of the tide level 23, the head, the head and the operation timing of the pump-turbine 20 and the water levels 11, 1 of the pond 8 in a day.
FIG. 7 is a time lapse diagram showing a relationship between changes of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ocean 2 Land or island 3 Current coastline 4 Current highest tide 5 Offshore dam 6 Caisson equipped with a pump-turbine 7 Partition dam 8, 9, 10 Pond 11 Highest water level of pond (set water level) 12 Lowest water level of pond 13 Average water level of the ponds 14 Average sea level 15 Current average low tide 3-16 Seabed gradient 17 Sea bottom with caisson 18 Highest tide after sea level rise 19 Set water level of the pond after sea level rise 20 Pump-turbine 21,22 Pump-turbine Draft tube 23 Tide curve 24,26 Tide level at start and end of pump operation 25,27 Pond water level at start and end of pump operation 28,30 Tide level at start and end of turbine operation 29,31 Turbine Pond water level at start and end of operation 32,33 Average head and head of pump and turbine 34,35 Operating hours of pump and turbine 36 New construction Seawalls 37 sluice gates of

Claims (10)

[Claims] 1. An offshore dam 5 including a caisson 6 equipped with a pump-turbine 20 and a partition dam 7 on the sea side of the coast 3 of the land 2 where flooding due to sea level rise is to be prevented.
A device to protect the land from rising sea level 1 by constantly maintaining the water level of the pond below the sea level by pump operation and its construction method. 2. The construction of a single pond 8 as one unit, firstly lowering the water level of the pond, and then adding similar ponds 9, 10 etc. along the shoreline as necessary, so that Construction method that adjusts construction period and construction cost of one pond according to budget. 3. A permanent land created by constantly lowering the water level of the pond 8, C-D-E of FIG. 3, is used for multipurpose use such as reclaimed land, seaside city, airport, harbor land, industrial park and the like. How to use land. 4. When the land is an island, as shown in FIG. 2, the offshore dam 5 has a closed curve surrounding the island, and the number of ponds and partition dams increases and decreases in proportion to the length of the shoreline of the island. Construction method. 5. The maximum water level 11 of the pond is set as a set water level, the set value is determined by the depth from the average sea level 14, and the minimum water level 12 of the pond is determined lower than the set water level. The operation of the pump is performed when the tide level is lower than the average sea level at night, and the operation of the turbine is performed when the tide level is higher than the average sea level in the daytime, so that the average head 33 of the turbine is larger than the average head 32 of the pump every time. An apparatus and an operation method according to the present invention that increase power generation efficiency to about 100%. 6. A caisson 6 fitted with a pump-turbine 20.
And a caisson 6 to improve the flow of seawater in the pond by connecting the two offshore dams 5 of one pond 8 at a distance.
Installation method. 7. A sluice 37 is installed in the partition dam 7, the sluice is opened if necessary, the water level of the adjacent ponds 8, 9 is controlled, the flow of seawater is adjusted, and the small work boat is provided. Sluice gate device for use in traffic. 8. The method according to the present invention, wherein the offshore dam 5 and the partition dam 7 including the caisson 6 are used for a traffic route such as a car, a train, and the like. 9. A method according to the present invention, wherein one or a plurality of ponds 8, 9, 10 and the like are constructed on a shore severely damaged by a tsunami to prevent the tsunami and normally used as a tidal pumping power station. 10. A method for using a pond for performing aquaculture and fisheries, especially for releasing large-sized fish, using the fact that the pond 8 is driven once a day by the operation of a pump-turbine, and that the seawater flows in and out of the tide even at low tide. .