JPH0420607A - Biologically clarified artificial beach - Google Patents

Abstract

PURPOSE:To obtain an artificial beach having natural purifying capability by forming a water-permeable wave dissipation bank and foundation consolidating masonry sunken- rocks at the earth tip of a breakwater, and by arranging a submerged breakwater, a water-permeable sand stopper, and a sandy beach between the breakwater and the water dissipation bank. CONSTITUTION:On the respective surfaces of a water-permeable wave dissipation bank 2, a water-passing course in the bank 2 and a foundation consolidating masonry sunken-rocks 3, a submerged breakwater 4, and a water-permeable sand stopper 5 in the offing of a breakwater 1, the organic corrupted substance of the cause of the pollution of seawater due to the attachable filtered edible living things of attachably living hard-shelled mussels, barnacles, and the like is converted to the organic fine pieces of the food of lugworms, crabs, and the like, and is reduced. Then, nitrogen or the like to be the nourishing source of planktons is absorbed into seaweeds growing thick to make nourishing salts inorganic with nitrification bacteria or the like living on the bank 2, the sunken rocks 3, the submerged breakwater 4, the sand stopper 5, and sand 6. After that, organic substance piled up on the surface of the sea bottom is made inorganic with trepangs and is turned into sea bottom soil. As a result, biological clarification can be performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] By arranging permeable breakwaters, foot protection reefs, submerged dikes, permeable sand stoppers, and sand in order from offshore areas such as outside of port breakwaters and reclaimed land seawalls. This relates to an artificial beach that purifies seawater and has a natural purifying ability.

[Conventional technology] The outside of port breakwaters and reclaimed land seawalls are installed for different purposes, and although they can be said to serve their purposes satisfactorily, in recent years land reclamation of seashore areas as part of waterfront planning has become more and more important. In recent years, the land and the sea in areas that have been developed through urban redevelopment have become particularly dirty, and annual red tide can be seen in the inner bays that border large cities such as Tokyo, Oban, and Ise Bay, making it difficult for residents living near the sea. The environment is not conducive to getting close to the sea.

For this reason, by installing an artificial beach that purifies seawater using its natural purifying ability, it is possible to create a new water area that meets the needs of society.

[Structure of the Invention] The present invention creates a new water area by providing natural purification ability to local areas such as the outside of a port breakwater or a reclaimed land seawall.

For this reason, the present invention constructs a permeable wave-dissipating levee and a foot-protected stone reef outside the breakwater of a port or at the site of a reclaimed land revetment, and installs a submerged levee or a sandy beach in between, and is surrounded by a permeable wave-dissipating levee. The sea area has been made into an artificial beach, and organic pollutants including plankton, which are the cause of decreased seawater transparency, are removed from the surface of the offshore permeable breakwater, the water flow path inside the breakwater, and the foot protection stone reef.・Reduced to organic fragments by sessile organisms such as mussels and barnacles that adhere to and reproduce on the surfaces of submerged embankments and permeable sand stoppers, and reduced by organic fragments that feed on organic fragments such as mussels and crabs. let

Next, nitrogen, which is a nutrient source for phytoplankton, adheres to the surface of the offshore permeable breakwater, the water flow path inside the breakwater, and the surfaces of the foot protection masonry reef, submerged breakwater, and permeable sand stop. Nutrient salts are mineralized by nitrifying bacteria, etc., which live in the gaps of sessile organisms that grow and propagate, and in the broken pieces of artificial beaches.

Nutrient salts are absorbed by the seaweed that grows on the submerged embankment and the surface of the permeable sand stop. The seaweed is eaten by shellfish and carcasses that live in submerged banks and permeable sandbanks.

In addition, organic matter deposited on the seafloor surface is mineralized by sea cucumbers and becomes seafloor soil. Note that sea cucumbers are active during the low water temperature period during the winter, and in the summer they hide in the gap between the rocky reef at the bottom of the permeable breakwater and the submerged levee to hibernate.

In addition to purifying seawater by concentrating nature's purification ability in multiple dimensions, permeable wave-dissipating levees attenuate waves by approximately 172 to 173 degrees, and submerged levees also attenuate to the same extent. The sea area surrounded by wave-dissipating dykes can remain calm, making the harbor an artificial beach that was previously unimaginable.
It provides a place for people to relax, play in the water, fish, etc.

[Example] Next, the present invention will be explained according to embodiments shown in the drawings.

A permeable breakwater 2 and a stone wall reef 3 are installed 200 to 500 m offshore from a breakwater 1 of a port along the waterline of the port. Then, the submerged levees 4 are widely stacked inside the permeable wave-dissipating levee 2 of the lever, and the permeable sand stops 5 are placed inside the levees 4.
Sand 6 is put between this sand stop and the breakwater 1 to create an artificial beach A, and the permeable breakwater 2 and the breakwater 1 are connected by a bridge 7, and the upper part of the permeable breakwater 2 is used as a fishing spot B. be.

[Effects of the invention] Despite the fact that there are many seawalls outside of port breakwaters and reclaimed land in urban areas and suburbs, they are merely facilities for dampening waves and protecting land from erosion, and are not necessarily called water-access areas. In addition, it is not a place where people can enjoy the sea, especially in the inner bays that border large cities, where annual red tides are seen due to eutrophication.

By creating an artificial beach according to the present invention, the offshore permeable breakwater can be protected by mussels, fujibocha, etc. The organic suspensions containing plankton, which are the cause of decreased transparency as seawater pollution, are converted into organic particles by the sessile filter-feeding organisms that are attached to them.
This is reduced by organic phagocytic organisms such as mussels and crabs.

Next, nitrogen, which is a nutrient source for phytoplankton, adheres to the surface of offshore permeable breakwaters, internal water passages, and surfaces of foot protection masonry reefs, submerged levees, and permeable sand stops, where they propagate. Nutrient salts are mineralized by nitrifying bacteria that live in the spaces between attached organisms and in the broken pieces of artificial beaches.

These nutrients are then absorbed by the seaweed that grows on the surface of the submerged embankment and permeable sand stop.
eaten by sea urchins). In addition, organic matter deposited on the seafloor surface is mineralized by sea cucumbers and becomes seafloor soil. Note that sea cucumbers are active during the low water temperature period during the winter, and in the summer they hide in the gap between the rocky reef at the bottom of the permeable breakwater and the submerged levee to hibernate.

As shown in 2, in addition to purifying seawater by utilizing the natural purification ability in multiple dimensions, permeable wave-dissipating levees attenuate waves by about 172 to 1/3, and submerged levees also attenuate to the same degree. By doing so, the sea area surrounded by wave-dissipating banks can remain calm, and as an artificial beach, it provides people with a place to relax, play in the water, fish, etc., and greatly contributes to the purification and improvement of the environment. It is.

[Brief explanation of the drawing]

1... Breakwater 2... Permeable breakwater 3...
- Stone wall reef 4...Submerged levee 5...Permeable sand stopper 6...Sand 7...Bridge Patent applicant Nippon Mikunya Co., Ltd. Representative Patent attorney Matsuda Province Procedural formalities written in city correct form) % formula % 1. Indication of the incident 1990 Patent Application No. 123022 2. Name of the invention Biological purification artificial beach Name Japan Mikunya Co., Ltd. Schematic diagram showing the artificial beach. Insert J.

Claims (1)

[Claims] Outside the breakwaters of ports and offshore of reclaimed land seawalls, there is a permeable wave-dissipating levee and a foot-hardening stone reef at the bottom, with submerged levees for growing seaweed and permeable sand stops placed at intervals from offshore. Biological purification artificial beach consisting of a sand stopper and a breakwater, etc.