JPH07122245B2 - Biological purification artificial beach - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] By arranging a permeable breakwater, a root reef, a submerged dike, a permeable sand stop, and sand in order from the offshore part of the breakwater of a harbor or offshore reclaimed land. The present invention relates to an artificial beach for purifying seawater that has the ability to purify nature.

[Prior Art] Outside the breakwater of the harbor and the revetment of the reclaimed land, etc. are installed for each purpose, and although it can be said that they fulfill their functions sufficiently for the purpose, the reclamation of the beach part as a waterfront plan in recent years. In recent years, the land and the sea ahead of the area developed by urban redevelopment have become particularly dirty, and the red tide of the year has been seen in the inner bays adjacent to large cities such as Tokyo, Osaka, and Ise Bay. The environment is not familiar with.

From this, it is possible to create a new hydrophilic area by installing an artificial beach that purifies seawater by its natural purification ability, and it will meet the needs of society.

[Structure of the Invention] The present invention creates a new hydrophilic region by giving a natural purification ability to the tip of a breakwater of a harbor or a reclaimed seawall.

For this reason, the present invention is to create a permeable breakwater and a root-setting stone reef outside the breakwater of a harbor or on a reclaimed land revetment, etc. The surface of an offshore permeable breakwater, the water flow path inside the breakwater, and the root-filling stone reef were used to remove organic suspensions containing plankton, which is a cause of transparency deterioration as seawater stains, using the sea area as an artificial beach.・ Reduced by adherent hyperphagous organisms such as mussels and barnacles that adhere to the surface of submerged dikes and permeable sand stoppers to reduce into organic strips, and organic strips such as kaikai, crabs, etc. .

Next, nitrogen, etc., which is a nutrient source of phytoplankton, adheres to the surface of the offshore permeable breakwater, the water passage inside the breakwater, and each surface of the root stone embankment, submerged dike, and permeable sand stop. The nutrient salts are mineralized by the interstices of the attached organisms that are allowed to grow and by the nitrifying bacteria that live in the sand of the artificial beach.

Nutrients are absorbed by seaweeds that grow on the submerged levee and the surface of the permeable sill. Seaweeds are eaten by shellfish and echinoderms that live in submerged dikes and permeable sand dams. In addition, the organic matter deposited on the surface of the seabed is mineralized by sea cucumber and becomes seabed soil. The sea cucumber activity is in the low water temperature during the winter, and in the summer, it infiltrates into the gap between the root-setting stone reef at the bottom of the permeable breakwater and the submerged dike, and becomes asleep.

In this way, seawater is purified by concentrating the natural purification capacity in a multidimensional manner, and at the same time, the permeable breakwaters
By attenuating about 1/2 to 1/3 and the submerged dike to the same extent, the sea area surrounded by the breakwater can be kept calm, and a harbor that was unimaginable until now can be used as an artificial beach. It provides a place for people to play, such as playing in water or fishing.

EXAMPLES Next, the present invention will be described with reference to the examples shown in the drawings.

A permeable breakwater 2 and a root-setting stone reef 3 will be installed along the waterfront of the port 200 to 500m offshore of the breakwater 1 of the port. The submerged ridge 4 is piled up widely inside the permeable breakwater 2, and a permeable sand stop 5 is placed inside the permeable breakwater 2. Sand 6 is inserted between the sand stop and the breakwater 1 to form the artificial beach A, Further, a bridge 7 connects the permeable breakwater 2 and the breakwater 1 and a fishing ground B is provided above the permeable breakwater 2.

[Effects of the Invention] Although there are many reclaimed seawalls outside the breakwater of a harbor in urban areas or in the suburbs, they are merely facilities that stop waves or protect the land from erosion, and are not always called hydrophilic areas. It is not a popular place, and especially in the inner bay that borders a large city, it is not a place to get close to the sea, as the red tide of the year has been seen due to eutrophication.

By using the artificial beach according to the present invention, the permeable breakwater offshore is represented by mussels, barnacles, etc. on the surface and inside water passages and root-setting stone reefs / submerged dikes / permeable sand stop surfaces. The organic suspension containing plankton, which causes the adherent hyperphagic organism to be propagated by adhesion, which causes a decrease in transparency as a stain of seawater, is formed into an organic strip.
This is diminished by organic spore-feeding organisms such as kaikai and crab.

Next, nitrogen, which is a nutrient source for phytoplankton, attaches and proliferates on the surface of the offshore permeable breakwater, the water passage inside it, and each of the root-setting stone reef, submerged dike, and permeable sand stop. Nutrients are mineralized by nitrifying bacteria, etc. that live in the pores of periphyton and in the sand of artificial beaches.

The nutrients are absorbed by the seaweeds that grow on the surface of the submerged dam and the permeable sand stop, and the seaweeds are eaten by shellfish (abalone and turban shell) and echinoderms (sea urchins) that live on the submerged dam and the permeable sand stop. . In addition, the organic matter deposited on the surface of the seabed is mineralized by sea cucumber and becomes seabed soil. In addition,
Sea cucumbers are active in the low water temperature during the winter, and in the summer, they infiltrate into the gap between the root rock and the submerged dike and the submerged dike and fall asleep. In this way, seawater is purified by concentrating the natural purification capacity in a multidimensional manner, while the permeable breakwater attenuates the waves by about 1/2 to 1/3, and the submerged dam is also reduced by the same degree. By doing so, the sea area surrounded by the breakwater can be kept calm, and as an artificial beach, it provides people with a place for recreation, water play, fishing, etc., which is very useful for purification and improvement of the environment. Is.

[Brief description of drawings]

 The drawing is a schematic view showing an artificial beach. 1 ... Breakwater, 2 ... Permeable breakwater, 3 ... Rooting stone reef, 4 ... Submerged dam, 5 ... Permeable sand stop, 6 ... Sand, 7 ... Bridge

Claims (1)

[Claims] 1. A permeable breakwater and a root-setting stone reef below the breakwater of a harbor or a reclaimed land revetment, between which a submerged dike for seaweed cultivation and a permeable sand stop are provided offshore. A biological purification artificial beach that is installed with a space in order, and sand is inserted between a sand stop and a breakwater.