JPH0577369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fish and shellfish swimming blocking device that blocks the swimming of fish and shellfish into and out of a predetermined sea area.

[Conventional technology]

In general, as a method to prevent fish and shellfish from entering or escaping a designated sea area such as a fish farm, flat electrodes or equally spaced A plurality of electrodes consisting of a plurality of electrode rods arranged in a row and electrically connected to each other are arranged in parallel at equal intervals, and a power source is used to
It has been considered to apply a potential to each electrode such that the potential of adjacent electrodes is different, and to form an electric field for blocking the swimming of fish and shellfish in the blocking section.

At this time, not only an electric field is formed between each electrode, but also a leakage electric field is generated outside between each electrode, and the electric field strength is maximum at the center between adjacent electrodes, but it has an effect of blocking the swimming of fish and shellfish. The effective electrode strength region with
It also extends to the outside between each electrode, which is the leakage electric field area mentioned above, and by utilizing this leakage electric field to the outside between each electrode, it is possible to effectively block the swimming of fish and shellfish into and out of the designated sea area. be able to.

[Problem to be solved by the invention]

In the conventional technology, if the electrode width, electrode spacing, etc. are not carefully selected, even if power is supplied so that the maximum electric field strength is a predetermined value, electric field leakage will increase, resulting in lower power consumption. The problem is that it becomes very large.

Therefore, the present invention has been made with the above points in mind,
The purpose is to reduce power consumption as much as possible by optimally setting the electrode width and electrode spacing.

[Means to solve the problem]

In order to achieve the above object, a plurality of electrodes having a width L are arranged in parallel at equal intervals in a swimming cutoff section in the sea, and a power supply is applied to each of the electrodes so that the potential of the adjacent electrodes is different. In the fish and shellfish swimming blocking device that applies a potential to form an electric field for blocking the swimming of fish and shellfish in the blocking portion, the present invention provides the following: the ratio D/L of the distance D and the width L of each of the electrodes is 1≦ It is characterized by setting D/L≦8.

[Effect]

With the above configuration, by setting the ratio between the interval of each electrode and the width L to 1≦D/L≦8, the maximum value of the electric field strength can be adjusted to a predetermined value by the power source. When power is supplied to , the power consumption is lower than when 1>D/L and D/L>8.

〔Example〕

Examples will be described with reference to the drawings.

In Fig. 1, which shows the schematic configuration, 1 is a plurality of flat electrodes with a width L that are arranged in parallel at equal intervals in a swimming cutoff part in the sea, 2 is a power supply, and one output terminal is connected every other , the other output terminal is connected to each of the remaining electrodes 1, and each electrode 1 has a
Potentials are applied so that the potentials of adjacent electrodes 1 are different.

At this time, the distance D and the width L are set so that the ratio D/L between the distance D and the width L of each electrode 1 is 1≦D/L≦8.

By the way, as shown in FIG. 1, the electric field strength at the center position P of the adjacent electrodes 1 where the electric field strength is maximum is E [V/cm], the applied voltage of the power source 2 is Vp [V], and the water depth is H [cm]. , if the resistivity of seawater is ρ [Ωcm], then
Experimentally, the applied voltage Vp can be expressed as Vp=(0.92-0.05D/L) ^-1・E・D..., and the power consumption P is as follows: P={0.6+(D/L) ^{- 1} }(n-1)Vp ²・H・
It can be expressed as ρ ^-1 ... Here, n is the number of poles.

Furthermore, when each electrode 1 is arranged in a swimming cutoff section with a length W, the maximum value E of the electric field strength is determined by the type of fish and shellfish targeted for swimming cutoff, and the interval D is determined by the size of the ship sailing on the sea, Since it is determined from the number of poles n, the electrode spacing D, and the cutoff length W, the only variable in the above equation is D/L, and the remaining E, ρ, D, (n-1), and H are constants. can be considered.

Therefore, the above equations and formulas can be rewritten as Vp=C ₁・(0.92−0.05D/L) ⁻¹ …… P=C ₂・{0.6+(D/L) ⁻¹ }・Vp ² …… Here, C ₁ and C ₂ are constants, and C ₁ = E・D, C ₂ = H・(n-1)・ρ ⁻¹ , respectively, and by substituting the above equation into the equation,
Power consumption P is P=C ₁ ²・C ₂・{0.6+(D/L) ^-1 }(0.92-0.
05D/L) ^-2 =K・0.6+(D/L) ^-1 /(0.92−0.05D
/L) ² ... is expressed as.

Here, K= ^E2 * ^D2 *H*ρ ^-1 *(n-1).

For example, D = 100 (cm), E = 0.1 (V/
cm), H = 50 (cm), ρ = 25 (Ωcm), and n = 3, and the relationship between D/L and P in the above equation is as shown in Figure 2. From Figure 2, when D/L is smaller than "1" or when D/L is larger than "8", power consumption P increases rapidly, so in order to reduce power consumption P as much as possible,
The electrode spacing D and the electrode width L may be set so that D/L satisfies the following: 1≦D/L≦8.

In this way, by setting the ratio D/L between the interval D of the electrodes 1 and the width L of the electrodes 1 to 1≦D/L≦8, the maximum value of the electric field intensity is set to a predetermined value by the power source 2. When power is supplied as follows, power consumption can be significantly reduced compared to when 1>D/L and D/L>8.

Note that the electrodes are not limited to the above-mentioned flat plate-like electrodes, and electrodes made of a plurality of electrode rods arranged at equal intervals and electrically connected to each other may be used.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

The ratio D/L of the electrode spacing D and the electrode width L is 1≦
By setting D/L≦8, when the power supply supplies power so that the maximum value of the electric field strength becomes a predetermined value, compared to when D/L is smaller than 1 or when D/L is larger than 8, Power consumption can be significantly reduced, and the operating cost of the device can be significantly reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the fish and shellfish swimming blocking device of the present invention, and FIG. 1 is a plan view, and FIG. 2 is a relationship between the ratio D/L of the electrode spacing D and the electrode width L and power consumption. It is a diagram. 1... Electrode, 2... Power supply.

Claims (1)

[Scope of Claims] 1. A plurality of electrodes having a width L are arranged in parallel at equal intervals in a swimming cutoff part in the sea, and a power source applies a potential to each electrode so that the potential of the adjacent electrodes is different. In the fish and shellfish swimming blocking device, which forms an electric field for blocking the swimming of fish and shellfish in the blocking portion, the ratio D/L between the distance D and the width L of each electrode is 1≦D/L≦8. A swimming blocking device for fish and shellfish, characterized in that it is set to: