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Seaweed Bed Project
Background
Condition of ocean
Sea deseart
Red tide
Blue tide
Measure
Seaforest
Mineral supply
Circulation and oxygen supply

地球の水をまもろう!
榛名湖畔

本文

Seaweed bed Project

Circulation and oxygen supply

 Circulation in the ocean is conducted by ocean current or tide current. Ocean current is general term for longitudinal current of ocean water in the earth level, while tide current has short term periodicity which depending on ebb-and-flow. In ocean current, water flows one direction for long time, and due to the characteristics, it largely separates warm current and cold current. Also, in vertical current occurs due to the difference of temperature between ocean surface and ocean depth. There are some ocean areas which have constant vertical current.In circulation due to ocean current, there are surface circulation and deep circulation depending on the depth. Surface circulation is the circulation which occurs by wind on the ocean surface, while deep circulation occurs by the unbalance of temperature and salt amount. By these circulation, lots of matters moves in ocean at the earth level thus becoming rich ocean. Oxygen dissolved in the ocean water by the waves goes deeply into the ocean and circulates.

 However, in inner ocean ad closed water areas such as coast, large circulation by ocean current doesn't occur so that these areas are easily affected by inner land area. Currently, by discharge of polluted matters, shore protection, and dredging works, Eco systems are destroyed and environment destruction becomes serious issues. In such inner ocean and closed water areas, Making circulation due to forced current enables to provide oxygen to the bottom of the ocean, to recover Eco system, to prevent lack of oxygen area, and facilitate the decomposition of nitrogen and phosphorous.


            


 Marine lyfter system can effectively make circulation in the areas such as inner ocean, inner bay and farms where retain ocean water and has risk of developing temperature layers which have serious effect on fish growth. Thus, Marine lyfter system contributes to conserve ecosystem and purify the water.By small amount of water from inner lands, large scale up and down convection mixing motion occurs. As a result water in the bottom of the ocean rises up and gradually large convection occurs. By the water current, oxygen spreads out in the deep water. Thus, this is the system to conserve Eco system, support natural purification function and improve water purification.

 Convection mixing motion is very safe and effectively uses natural function. Only air goes into the ocean so that there is no risk of secondary effects. Moreover, it is simple structure and strong so that has high durability. It can be used for long time. Also, it enables to conduct automatic operation or remote control. Furthermore, it doesn't require large power and use with solar battery. Due to these labor saving efforts, it reduces the running costs.

 
         


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