CN113854209A - Flow field model suitable for adhesive roe incubation and determination method - Google Patents

Flow field model suitable for adhesive roe incubation and determination method Download PDF

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CN113854209A
CN113854209A CN202111141471.0A CN202111141471A CN113854209A CN 113854209 A CN113854209 A CN 113854209A CN 202111141471 A CN202111141471 A CN 202111141471A CN 113854209 A CN113854209 A CN 113854209A
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flow
area
adhesive
fish reef
flow field
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CN113854209B (en
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王卫杰
孙涛
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Beijing Normal University
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Beijing Normal University
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/10—Culture of aquatic animals of fish
    • A01K61/17—Hatching, e.g. incubators
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00—Culture of aquatic animals
    • A01K61/70—Artificial fishing banks or reefs
    • A01K61/73—Artificial fishing banks or reefs assembled of components
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

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Abstract

The invention relates to the technical field of marine ranching construction, in particular to a flow field model suitable for hatching adhesive fish eggs and a determination method. The flow field model includes: the water tank is provided with a depth H; the artificial fish reef is arranged in the middle area of the bottom of the water tank, the height of the artificial fish reef is less than 1/6H, the distance between the artificial fish reef and the two wall surfaces of the water tank is M, and the width of the artificial fish reef is greater than 4M; and (3) attaching the adhesive roe to a set area on the artificial fish reef, wherein the set area is an ascending flow area, a back vortex area, a transverse flow area and a plane flow area. According to the method, the corresponding time-average flow velocity and the corresponding turbulence intensity are obtained through instantaneous flow velocity data calculation and are used as the limit value of the flow field condition suitable for hatching the adhesive roes. The invention can obtain the flow field condition suitable for the development of the adhesive roe so as to improve the survival and multiplication rate of the fish.

Description

Flow field model suitable for adhesive roe incubation and determination method
Technical Field
The invention relates to the technical field of marine ranching construction, in particular to a flow field model suitable for hatching adhesive fish eggs and a determination method.
Background
Hydrodynamic conditions are important factors influencing the habitat suitability of the fish habitat, and the change of hydrodynamic conditions in a water area can have important influence on the survival and the propagation of the fish. Hydrodynamic indexes influencing the survival and the propagation of the fishes mainly comprise flow velocity, water depth, kinetic energy gradient, section average vorticity and the like in a water area. The flow velocity of the water flow can stimulate the behaviors of swimming, spawning, predation and the like of the fishes, so that the flow velocity is a key index for evaluating the suitability of the fish habitat.
The flow rate of the water flow has an important influence on both the spawning of the fish and the hatching of the eggs. The proper flow rate can stimulate the fish to lay eggs; the development of fish gonads needs sufficient oxygen, the content of dissolved oxygen in water has a close relation with the flow velocity of water flow, the water area with large flow velocity has good gas exchange effect of upper and lower water bodies, the content of dissolved oxygen in water is high, and the content of dissolved oxygen in water is lower in the water area with small flow velocity, so that the spawning of fish is influenced obviously due to the difference of water flow conditions. In addition, eggs laid by fishes are divided into floating eggs and adhesive eggs, the floating eggs can be hatched in a floating state in water, and the adhesive eggs can be hatched only when the adhesive eggs are attached to egg laying bases, so that the spawning sites of the fishes need to have unique hydrologic and hydraulic conditions, and the fish eggs can be successfully hatched into young fishes finally. At present, researches on the flow velocity of water flow suitable for hatching roes mainly focus on floating roes, and researches on a flow field suitable for hatching the adhesive roes are rarely reported, which is mainly caused by the lack of an observation technology for the flow field suitable for hatching the adhesive roes, so that a determination technology for the flow field suitable for hatching the adhesive roes needs to be developed.
Disclosure of Invention
In view of this, the invention provides a method for determining a flow field suitable for hatching of adhesive roes, so as to determine flow field conditions suitable for growth of the adhesive roes, thereby improving survival and multiplication rate of fish.
In order to achieve the above purpose, the present invention mainly provides the following technical solutions:
an adhesive roe hatching suitable flow field model, comprising: the water tank is provided with a depth H; the artificial fish reef is arranged in the middle area of the bottom of the water tank, the height of the artificial fish reef is less than 1/6H, the distance between the artificial fish reef and the two wall surfaces of the water tank is M, and the width of the artificial fish reef is greater than 4M; and (3) attaching the adhesive roe to a set area on the artificial fish reef, wherein the set area is an ascending flow area, a back vortex area, a transverse flow area and a plane flow area.
In the above suitable flow field model for hatching the adhesive fish eggs, the bottom middle region is a region in a circle which takes the central point of the bottom surface of the water tank as the center of a circle and takes the side length of the artificial fish reef as the radius.
In the flow field model suitable for the incubation of the adhesive fish eggs, the actually collected fish eggs with activity are attached to the artificial fish reef in an artificial mode;
among the suitable flow field model of foretell adhesive fish egg hatching, the solid square that the artificial fish reef was formed by the concrete material preparation the surface covering of solid square has the roughness of straw mat in order to increase artificial fish reef.
In the above suitable flow field model for hatching the adhesive fish eggs, in the ascending flow region, the ratio of the vertical flow velocity to the incoming flow velocity at the front part of the artificial fish reef is greater than or equal to 10%;
in the above suitable flow field model for hatching the adhesive roes, the back vortex region is a slow flow region with vortex formed on the back of the artificial fish reef;
in the flow field model suitable for the incubation of the adhesive roes, the transverse flow area is a flow field area on the side surface of the artificial fish reef;
in the above flow field model suitable for hatching the adhesive roes, the planar flow area is a flow field area on the upper part of the artificial fish reef.
A method for measuring a flow field suitable for hatching adhesive fish eggs comprises the following steps,
step 1, arranging a flow velocity meter in the flow field model suitable for the incubation of the adhesive roes, which is disclosed by claims 1-4, wherein a probe of the flow velocity meter is arranged at a position 5-10 cm above the adhesive roes;
step 2, performing an experiment in the multifunctional circulating water tank, slowly increasing the water flow in the water tank, wherein the water flow is 0-10 cm/s, observing the attachment state of roes on the fish reef model, and measuring instantaneous flow velocity data of a flow field around the current meter when the roes are suspended;
step 3, processing the instantaneous flow rate data by using software, screening each group of data by the correlation of not less than 70%, and calculating the screened instantaneous flow rate data to obtain corresponding time-average flow rate and turbulence intensity;
and 4, taking the time-average flow rate and the turbulence intensity as upper limits to serve as a limit value of flow field conditions suitable for hatching the adhesive fish eggs.
In the above determination method, the time-average flow rate includes time-average flow rates in three directions, namely, a longitudinal direction, a transverse direction and a vertical direction, and a calculation formula of the time-average flow rates in the three directions is as follows:
Figure BDA0003284089330000031
Figure BDA0003284089330000032
Figure BDA0003284089330000033
wherein u, v and w are respectively the time-average flow velocity of the longitudinal direction, the transverse direction and the vertical direction, and the unit is m/s; n is the number of samples of each measuring point; u. ofi、viAnd wiThe instantaneous flow rates in m/s are longitudinal, transverse and vertical, respectively.
In the above determination method, the turbulence intensity includes turbulence intensities in the longitudinal direction, the transverse direction and the vertical direction, and the calculation formulas of the turbulence intensities in the three directions are as follows:
Figure BDA0003284089330000034
Figure BDA0003284089330000035
Figure BDA0003284089330000036
in the formula, σu、σvAnd σwRespectively, the root mean square of the longitudinal, transverse and vertical pulsating flow velocity, i.e. the turbulence intensity, m/s.
In the above measurement method, the flow meter is a doppler flow meter, and a probe on a probe of the doppler flow meter, which detects the flow velocity in the X direction, points in the incoming flow direction of the water flow; the sampling frequency of the Doppler current meter is 25Hz, each measuring point lasts for 20-25 s, and 500-625 data can be obtained.
In the measuring method, the adhesive fish eggs are gathered into an egg mass with the diameter of not more than 5cm, and the experiment is repeated for 3-5 times in each set area.
In the above measurement method, in step 3, the software is windav software.
By means of the technical scheme, the flow field model suitable for the hatching of the adhesive fish eggs, provided by the invention, has the following advantages:
1) the flow field model suitable for the incubation of the adhesive fish eggs, provided by the embodiment of the invention, is simple in structure, can simulate an egg laying base through the reduced artificial fish reef body and simulate an indoor water tank experiment, is convenient to observe the attachment states of the adhesive fish eggs under different water flow velocities, and can truly reflect the flow field and the attachment states of the fish eggs;
2) in the method for determining the flow field suitable for hatching the adhesive roes, provided by the embodiment of the invention, the Doppler current meter is used for determining the three-dimensional instantaneous water flow velocity of the surrounding flow field during the suspension of the adhesive roes, and the flow field condition suitable for hatching the adhesive roes is calculated according to the instantaneous water flow velocity (namely the instantaneous flow velocity). The flow field condition suitable for the development of the adhesive fish eggs is determined, and the survival and multiplication rate of the fish can be improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an artificial fish reef provided by an embodiment of the invention;
FIG. 2 is a schematic view showing the structure of the present invention in which the egg masses of the fish eggs are adhered to the upstream region;
FIG. 3 is a schematic structural view of the position of the egg masses of the roes adhered to the plane flow area according to the present invention;
FIG. 4 is a schematic structural view of the position of the egg masses of the roes adhered to the back vortex region in the present invention;
FIG. 5 is a schematic structural view of the position of the egg masses of roes adhering to the transverse flow region according to the present invention;
fig. 6 is a schematic structural view of the placement position of the current meter in the invention when measuring the flow rate of water.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of a flow field model and a method for determining an adhesive egg hatching suitable flow field according to the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Flow field model embodiments
As shown in fig. 1 to 6, the present embodiment provides a flow field model suitable for hatching of adhesive roe, the flow field model includes: the water tank is provided with a depth H; the artificial fish reef is arranged in the middle area of the bottom of the water tank, the height of the artificial fish reef is less than 1/6H, the distance between the artificial fish reef and the two wall surfaces of the water tank is M, and the width of the artificial fish reef is greater than 4M; and (3) attaching the adhesive roe to a set area on the artificial fish reef, wherein the set area is an ascending flow area, a back vortex area, a transverse flow area and a plane flow area.
In the embodiment, the specific specification of the water tank is 25m in length, 0.8m in width and 0.8m in height, the depth of water in the water tank is 0.4m, and the artificial fish reef is a cube with the side length of 20 cm; the distance between the artificial fish reef and the two wall surfaces of the water tank is 0.3 m.
The artificial fish reef comprises an artificial fish reef body 1 and a straw mat 2 covering the artificial fish reef body 1.
The flow field model suitable for hatching the adhesive roes provided by the embodiment is a reduced artificial fish reef body 1 for simulating a spawning base, observing the attachment states of the adhesive roes under different water flow velocities through an indoor water tank experiment, measuring the three-dimensional instantaneous water flow velocity of the surrounding flow field during suspension of the adhesive roes by using a Doppler current velocity meter (ADV), and calculating the flow field condition suitable for hatching the adhesive roes according to the instantaneous water flow velocity (namely instantaneous flow velocity) data.
The fish that produces adhesive ovum uses natural reef as its foundation of laying eggs in the ocean more, in order to press close to the real environment of laying eggs of fish in the experiment, with solid artificial fish shelter body 1 that concrete material made forms as the basis, cover rough thing such as grass mat 2 on its surface in order to increase the roughness of fish shelter model to fix the fish shelter model in the bottom surface of basin with the adhesive, prevent to lead to fish shelter model dystopy because of rivers erode intensity is too big, in order to reach the purpose of furthest simulation fish foundation of laying eggs. The size of the artificial fish reef body 1 needs to be determined according to the specific size of a water tank used for experiments, and generally, the height of the fish reef model needs to be smaller than 1/6 of the water depth in the water tank so as to avoid incomplete upwelling development of the fish reef; the distance between the fish reef model and the two wall surfaces of the water tank is required to be larger than 4 times of the width of the water tank so as to avoid the wall surfaces of the water tank from interfering with a transverse flow field generated by the fish reef; because the regional length of the produced back vortex of fish reef model is longer, consequently should lay the fish reef model in the middle part position of basin, can avoid the unstable and the not enough defect of basin rear portion length of the anterior rivers of basin like this. The concrete picture is shown in figure 1.
The bottom middle area is an area in a circle which takes the central point of the bottom surface of the water tank as the center of a circle and takes the artificial fish reef as the side length as the radius.
The method is characterized in that the actually collected fish eggs with activity are attached to the artificial fish reef in an artificial mode.
In the ascending flow area, the ratio of the vertical flow velocity to the incoming flow velocity at the front part of the artificial fish reef is more than or equal to 10 percent;
the back vortex area is a slow flow area with vortex formed on the back of the artificial fish reef;
the transverse flow area is a flow field area on the side surface of the artificial fish reef;
and the planar flow area is a flow field area at the upper part of the artificial fish reef.
Therefore, in the experiment, according to all possible stress conditions of a typical flow field area when roes are adhered to a fish reef model, roes are adhered to an upflow area (namely, a fish reef model upstream side), a back vortex area (a fish reef model back flow side), a transverse flow area (a fish reef model side) and a plane flow area (a fish reef model upper top side) of the fish reef model respectively, and then the flow field when the roes are adhered to different areas is observed and determined, wherein the specific adhesion mode of the roes is shown in the attached drawings 2-5, specifically, the attached drawings 2-4 are left view direction views of the attached drawing 1, and the attached drawing 5 is top view direction views of the attached drawing 1.
Examples of measurement methods
The embodiment discloses a method for measuring a flow field suitable for hatching adhesive roes, which comprises the following steps,
step 1, arranging a current meter in the flow field model suitable for the incubation of the adhesive roes, which is disclosed by claims 1-4, wherein a probe of the current meter is arranged at a position 5-10 cm above the roes;
step 2, slowly adjusting the water flow in the water tank in the experiment (slowly adjusting the water flow from 0 to 10cm/s), observing the attachment state of the roes on the fish reef model, and measuring instantaneous flow velocity data of a flow field around the current meter when the roes are suspended (namely the roes are changed from the adhesion state to the floating state);
step 3, processing the instantaneous flow rate data by using software, screening each group of data by the correlation of not less than 70%, and calculating the screened instantaneous flow rate data to obtain corresponding time-average flow rate and turbulence intensity;
and 4, taking the time-average flow rate and the turbulence intensity as upper limits to serve as a limit value of flow field conditions suitable for hatching the adhesive fish eggs.
The time-average flow rate comprises time-average flow rates in the longitudinal direction, the transverse direction and the vertical direction, and the calculation formula of the time-average flow rates in the three directions is as follows:
Figure BDA0003284089330000071
Figure BDA0003284089330000072
Figure BDA0003284089330000073
wherein u, v and w are respectively the time-average flow velocity of the longitudinal direction, the transverse direction and the vertical direction, and the unit is m/s; n is the number of samples of each measuring point; u. ofi、viAnd wiThe instantaneous flow rates in m/s are longitudinal, transverse and vertical, respectively.
The turbulence intensity comprises turbulence intensities in the longitudinal direction, the transverse direction and the vertical direction, and the calculation formulas of the turbulence intensities in the three directions are as follows:
Figure BDA0003284089330000074
Figure BDA0003284089330000075
Figure BDA0003284089330000076
in the formula, σu、σvAnd σwRespectively, the root mean square of the longitudinal, transverse and vertical pulsating flow velocity, i.e. the turbulence intensity, m/s.
And a probe for detecting the water flow speed in the X direction on the probe of the current meter points to the incoming flow direction of the water flow.
In the experiment, the experiment should be respectively carried out on representative egg masses with different sizes, so that the final experiment result can cover the condition that all fish egg masses are suspended, and the experiment is repeated for 5 times for each egg mass.
Flume experiment for measuring floating state of adhesive roe under action of water flow
After the artificial fish reef body 1 is manufactured according to the method and is arranged in the water tank, the adhesive roes are taken out and attached to the artificial fish reef body 1. The acting force that receives when the roe adheres to the different positions in fish reef flow field is different, the roe adheres to when rising the flow region of fish reef model, receive the combined action of gravity, resistance, buoyancy etc. the roe only receives the effect of rivers scouring force and resistance in the plane flow region at fish reef model top, can receive gravity when the transverse flow region of fish reef model side, vertical and vertical resistance and the effect of rivers scouring force, and its rivers acting force that receives when the fish reef model back is less than other regions in flow field.
In the experiment, the water flow in the water tank is slowly adjusted, the attachment state of the roes on the fish reef model is observed, and the water flow velocity of the surrounding flow field is measured when the roes are suspended. In the experiment, a Doppler current meter (ADV) is adopted to accurately measure the water flow velocity of the flow field around the roe. In the experiment, a probe of a doppler current meter (ADV) is placed 5cm or 10cm above the roe, and then a probe for detecting the water flow velocity in the X direction on the probe is pointed to the incoming flow direction of the water flow, as shown in fig. 6, the doppler current meter (ADV) comprises a sending probe 31 and a plurality of receiving probes 32, the roe is used as a sampling body 33, wherein: the line between the transmission probe 31 and the sample volume 33 forms an angle of 30 ° with the line between the reception probe 32 and the sample volume 33. In the experiment, the experiment should be respectively carried out on representative egg masses with different sizes, so that the final experiment result can cover the condition that all fish egg masses are suspended, and the experiment is repeated for 5 times for each egg mass.
Calculation method suitable for adhesive fish egg hatching flow field
In the experiment, the sampling frequency of an ADV (advanced dynamic pressure) current meter is set to be 25Hz, each measuring point lasts for 20-25 s, 500-625 data can be obtained, software WINADV is used for processing the data, each group of data is screened according to the relevance of not less than 70%, and the screened data are calculated to obtain the corresponding time-average current and the corresponding turbulence intensity.
And finally, calculating the measured data when the fish eggs are adhered to the upflow area, the back vortex area, the transverse flow area and the plane flow area of the fish reef model by the method to obtain the upper limit of the flow velocity of the water flow in the peripheral flow field when the fish eggs are suspended as 0.3m/s and the upper limit of the turbulence intensity as 0.04m/s, and taking the upper limit as the flow field condition range suitable for the incubation of the adhesive fish eggs.
In the method for determining the flow field suitable for hatching the adhesive roes, provided by the embodiment of the invention, the Doppler current meter is used for determining the three-dimensional instantaneous water flow velocity of the surrounding flow field during the suspension of the adhesive roes, and the flow field condition suitable for hatching the adhesive roes is calculated according to the instantaneous water flow velocity (namely the instantaneous flow velocity). The flow field condition suitable for the development of the adhesive fish eggs is determined, and the survival and multiplication rate of the fish can be improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.

Claims (10)

1. An adhesive roe hatching suitable flow field model is characterized by comprising:
the water tank is provided with a depth H;
the artificial fish reef is arranged in the middle area of the bottom of the water tank, the height of the artificial fish reef is less than 1/6H, the distance between the artificial fish reef and the two wall surfaces of the water tank is M, and the width of the artificial fish reef is greater than 4M;
and (3) attaching the adhesive roe to a set area on the artificial fish reef, wherein the set area is an ascending flow area, a back vortex area, a transverse flow area and a plane flow area.
2. The adherent roe hatching suitable flow field model of claim 1,
the bottom middle area is an area in a circle which takes the central point of the bottom surface of the water tank as a circle center and takes the side length of the artificial fish reef as a radius.
3. The adherent roe hatching suitable flow field model of claim 1,
adhering the adhesive roe to an artificial fish reef in an artificial mode by using the actually collected roe with activity;
artifical fish reef is the solid square that forms by the preparation of concrete material the surface covering of solid square has the roughness of straw mat in order to increase artifical fish reef.
4. The adherent roe hatching suitable flow field model of claim 1,
in the ascending flow area, the ratio of the vertical flow velocity to the incoming flow velocity at the front part of the artificial fish reef is more than or equal to 10 percent;
the back vortex area is a slow flow area with vortex formed on the back of the artificial fish reef;
the transverse flow area is a flow field area on the side surface of the artificial fish reef;
and the planar flow area is a flow field area at the upper part of the artificial fish reef.
5. A method for measuring a flow field suitable for hatching adhesive fish eggs is characterized by comprising the following steps,
step 1, arranging a flow velocity meter in the flow field model suitable for the incubation of the adhesive roes, which is disclosed by claims 1-4, wherein a probe of the flow velocity meter is arranged at a position 5-10 cm above the adhesive roes;
step 2, performing an experiment in the multifunctional circulating water tank, slowly increasing the water flow in the water tank, wherein the water flow is 0-10 cm/s, observing the attachment state of roes on the fish reef model, and measuring instantaneous flow velocity data of a flow field around the current meter when the roes are suspended;
step 3, processing the instantaneous flow rate data by using software, screening each group of data by the correlation of not less than 70%, and calculating the screened instantaneous flow rate data to obtain corresponding time-average flow rate and turbulence intensity;
and 4, taking the time-average flow rate and the turbulence intensity as upper limits to serve as a limit value of flow field conditions suitable for hatching the adhesive fish eggs.
6. The method of measuring according to claim 5,
the time-average flow rate comprises time-average flow rates in the longitudinal direction, the transverse direction and the vertical direction, and the calculation formula of the time-average flow rates in the three directions is as follows:
Figure FDA0003284089320000021
Figure FDA0003284089320000022
Figure FDA0003284089320000023
wherein u, v and w are respectively the time-average flow velocity of the longitudinal direction, the transverse direction and the vertical direction, and the unit is m/s; n is the number of samples of each measuring point; u. ofi、viAnd wiThe instantaneous flow rates in m/s are longitudinal, transverse and vertical, respectively.
7. The method of measuring according to claim 6,
the turbulence intensity comprises turbulence intensities in the longitudinal direction, the transverse direction and the vertical direction, and the calculation formulas of the turbulence intensities in the three directions are as follows:
Figure FDA0003284089320000024
Figure FDA0003284089320000025
Figure FDA0003284089320000026
in the formula, σu、σvAnd σwRespectively, the root mean square of the longitudinal, transverse and vertical pulsating flow velocity, i.e. the turbulence intensity, m/s.
8. The method of measuring according to claim 5,
the flow meter is a Doppler flow meter, and a probe for detecting the water flow speed in the X direction on a probe of the Doppler flow meter points to the incoming flow direction of the water flow; the sampling frequency of the Doppler current meter is 25Hz, each measuring point lasts for 20-25 s, and 500-625 data can be obtained.
9. The method of measuring according to claim 5,
the adhesive fish eggs are gathered into egg masses with the diameter not larger than 5cm, and the experiment is repeated for 3-5 times in each set area.
10. The method of measuring according to claim 5,
in step 3, the software is WINADV software.
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CN111165411A (en) * 2020-01-21 2020-05-19 大连海洋大学 Up-flow type fish resource maintenance reef

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Publication number Priority date Publication date Assignee Title
AU2015202133A1 (en) * 2014-04-24 2015-11-12 Ocean Grown Abalone Limited An artificial reef structure
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