JPS5934331B2 - Teisou Inokumi Agehouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for pumping up bottom water using only natural forces, in order to increase the productivity of fishing grounds by using nutrient-rich bottom water.

Sea bottom water generally contains large amounts of nutrients.

Among the trace components in seawater, these nutrient salts include silicates, phosphates, nitrates, nitrites, ammonium salts, etc.
It contains relatively abundant components that are inaccessible to the growth of phytoplankton, and exists in large quantities in the deep sea where ordinary fish cannot live due to water pressure and oxygen levels, that is, at depths of 100 m or deeper. .

For example, when we investigated the distribution of nutrients in the sea near Noto on the Sea of Japan coast, we found that the proportion of components that are particularly effective for the growth of fish is shown in Table 1, and increases rapidly at a depth of 100 meters. I know that there is.

Therefore, when bottom water is brought to the sea surface and mixed with surface water, sunlight promotes the reproduction of phytoplankton and zooplankton, resulting in the growth of young fish and small fish that feed on plankton, which in turn feed on small fish. It is already well known that large fish can be bred.

However, when artificial prime movers such as motors and internal combustion engines are used to pump up bottom water, maintenance and inspections require manpower, which tends to increase operating costs, ultimately leading to an increase in the cost of fishery products.

In order to solve the above problems, the present invention provides a method for pumping up bottom water using only natural forces, and will be explained below with reference to the drawings.

In the figure, the right side of embankment 1 is the sea, and the left side is land.A weir 3 is integrally installed in a concrete water tank 2 installed on embankment 1, and the inside is a
, the second storage chamber A and B are divided, and the height of the upper edge of the weir 3 is set 8 by ΔH lower than the sea level 4 at high tide.

△H above is the tidal level difference H between sea level 4 and 4' at high tide and low tide
However, in the embodiment, ΔH is set to a relatively small value.

This is to prevent the bottom layer water once pumped into the storage chamber B from escaping as much as possible, as will be described later.

The upper end of the pumping pipe 5 is opened at the center of the bottom of the storage chamber A through a filter 6, and the lower end of the pipe 5 is opened at the center of the bottom of the storage chamber A, for example.
It opens into the bottom water area 7 deeper than oom.

Note that 8 is a cock attached to the water tank 2, 9 is a pump, and 10 is a pipe for supplying the bottom water in the storage chamber B pressurized by the pump 9 to a sprinkler (not shown) in the fish farm.

When the storage chamber B is empty at low tide, when the sea level 4' gradually rises when the tide rises, the sea level in the storage chamber A is also pumped through the pumping pipe 5 to the bottom water area 7 so that the sea level 4' remains at the same level. The bottom layer water inside rises into the storage chamber A.

When the sea level in storage chamber A exceeds the upper edge of weir 3, bottom layer water continuously overflows from storage chamber A to storage chamber B, and this overflow action makes the sea level in storage chambers A and B equal. During this period, the bottom water is continuously supplied into the storage chamber A from the pumping pipe 5.

Therefore, at high tide, storage chambers A and B are filled with bottom water up to the sea level 4 shown by the chain line.

Next, when the tide ebbs, the bottom water in the hatched area on storage chamber B will escape to storage chamber A until the sea level reaches 4" in tank 2, but when the sea level reaches 4" When this level is reached, the bottom layer water in the storage chamber B at that time will be captured in the storage chamber B by the weir 3, and as much bottom layer water as possible will be captured in the storage chamber B.
remain within.

The sea level in storage room A gradually decreases until it reaches low tide, and after reaching sea level l, it moves to the next cycle where it rises again.

The bottom water captured in storage chamber B will be stored just before the next high tide, when the sea level is 4.
Until the level of ζ is reached, the bottom water in storage chamber A is insulated from the bottom water, heated by the surrounding atmospheric temperature and sunlight, and the temperature rises to a level that does not cause cold water pollution even when sprayed on the farm. do.

The cock 8 is opened at an appropriate time, and the bottom layer water in the storage chamber B is supplied to the sprinkler of the fish farm by the pump 9, so that the bottom layer water in the storage chamber B is used up.

If △H is brought closer to H, when the tide goes from low tide to high tide, the bottom water that was once pumped up above the storage chamber B will escape to the storage chamber A side until it is blocked by the weir 3 at low tide, but if the cock 8 is Driving the open pump 9 has the advantage of increasing the period during which bottom water can be used continuously.

However, in that case, the bottom layer water immediately after being pumped is
It will be supplied to aquaculture farms.

Therefore, unless a particularly large amount of bottom water is required, storage room B
In order to temporarily store as much bottom water as possible, △H
It is convenient to make it as small as possible.

As explained above, according to the present invention, bottom water can be automatically pumped up into the storage chamber B by using the water tank 2 having the weir 3 and the pumping pipe 5, and the height of the weir 3 can be adjusted appropriately. Depending on the selection, it is possible to capture as much bottom water as possible in storage chamber B and raise the temperature, or to increase △H to a certain extent so that the necessary amount of bottom water can be freely used when necessary. can.

[Brief explanation of drawings]

The figure is a schematic longitudinal side view of an apparatus for carrying out the invention. 2 is a water tank, 3 is a weir, 4 is the sea surface, 5 is a pumping pipe, 7 is a bottom water area, 8 is a cock, and 9 is a pump.

Claims (1)

[Claims] 1. A first storage chamber having a weir whose upper edge is lower than the tide level at high tide, and one or more second storage chambers communicating with the weir.
A storage chamber is provided, and the upper end of a pumping pipe whose lower end opens into the bottom water body is opened at the bottom of the first storage chamber, and the water rises to the first storage chamber through the pumping pipe between low tide and high tide. A method for pumping up bottom water, comprising: overflowing the bottom water into the second storage chamber over the weir and filling the second storage chamber.