CN110400068B - Artificial fish reef scale effect evaluation method - Google Patents
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Abstract
The invention provides an artificial fish reef scale effect evaluation method in the technical field of marine pasture construction, which comprises the following steps of 1) obtaining artificial fish reef flow field effect data of various construction modes through a numerical simulation experiment; 2) Extracting an artificial fish reef construction mode index according to experimental conditions; 3) Simultaneously selecting and calculating a range and an intensity index representing a flow field effect; 4) Establishing an artificial fish reef construction mode index and each flow field effect model; 5) According to the model, a case method for optimizing the construction scale of the artificial fish reef is provided. The system comprehensively provides the artificial reef construction mode index, the flow field effect range and the strength index, establishes the model relation between the two indexes, and provides the artificial reef scale optimization construction method, thereby having practical significance for the artificial reef construction under the strategies of reducing, improving quality and improving efficiency.
Description
Technical Field
The invention relates to the technical field of marine pasture construction, in particular to an artificial fish reef scale effect evaluation method.
Background
The artificial reef is widely applied to the construction of large ocean pasture engineering in China with good marine ecological restoration and fishery resource maintenance effects, and becomes a facility foundation for the construction of the ocean pasture. Along with the increasingly prominent construction effect of the artificial reefs, more coastal areas are opened with large-scale throwing, and by the end of 2018, the throwing amount of the artificial reefs reaches about 8325 and Mo Kongfang and is distributed over all coastal cities in China. In order to realize the artificial fish reef construction strategy of 'reducing, improving quality and improving effect', the construction scale optimization research on the artificial fish reef is particularly important.
The primary main idea of the artificial reef construction is that the production and transmission of nutrient salt, substrate grain size, primary productivity and the like are stimulated through the unique flow field effect generated around the reef body, and the effects of proliferation of plankton, upper-layer swimming organisms and benthos resources are achieved in the form of food supply and habitat modification, so that the artificial reef flow field effect is the basis for the artificial reef to exert ecological and biological effects, and is an important construction result embodiment of the artificial reef. The flow field effect generated by the artificial reef is influenced by the difference of the artificial reef construction modes, and the research on the relation between the artificial reef construction modes and the flow field effect is a numerical basis for optimizing the scale of the artificial reef.
Disclosure of Invention
The invention aims to provide an artificial reef scale effect evaluation method, which comprehensively provides an artificial reef construction mode index, a flow field effect range and an intensity index, establishes a model relation between the two indexes, and provides an artificial reef scale optimization construction method, so that the method has practical significance for artificial reef construction under a reduction quality-increasing and effect-increasing reef construction strategy.
The purpose of the invention is realized in the following way: the artificial fish reef scale effect evaluation method comprises the following steps:
s1, obtaining artificial fish reef flow field effect data of various construction modes through a numerical simulation experiment;
s2, extracting an artificial reef construction mode index according to experimental conditions, wherein the artificial reef construction mode index is divided into an artificial reef construction scale index and an artificial reef construction strength index;
the artificial reef construction scale indexes comprise unit reef side length and height, arrangement interval, throwing amount and permeability, wherein the unit reef side length refers to the boundary length of an artificial reef combination area, the opposite side length refers to the ratio of the unit artificial reef side length to the reef single side length, the reef height refers to the average height of the unit artificial reef, and the relative height refers to the ratio of the unit reef height to the reef single height; the artificial fish reef throwing quantity refers to throwing all artificial fish reef blocks in a certain range of the sea area; the arrangement space refers to the distance between artificial reef units and is expressed by the side length multiple of the artificial reef units; the permeability refers to the ratio of the volume of the single concrete of the artificial fish reef to the volume of the empty space of the single concrete of the artificial fish reef, and represents the circulation degree of the artificial fish reef;
the artificial reef construction strength index comprises a unit reef volume rate, a enclosing degree, a staggered degree and a flow area ratio; wherein the unit reef volume rate refers to the ratio of the unit reef area artificial reef throwing amount to the whole space volume of the unit reef, the enclosure degree refers to the ratio of the sum of the peripheral lengths of all the outer side reefs of the reef stack in a certain range to the whole peripheral line, the stagger degree refers to the height difference between the average height and the highest height of the artificial reef stack in a certain range, and the facing flow area ratio R f The ratio of the area of the facing flow of the artificial fish reef to the occupied area of the reef pile is as follows: r is R f (a)＝A F /A T The method comprises the steps of carrying out a first treatment on the surface of the Wherein A is F Representing the area of the front flow-facing area of the artificial reef facing the direction a, A T Representing the total reef land area;
s3, determining corresponding flow field effect indexes by taking an artificial fish reef construction target as a standard, wherein the flow field effect is expressed as the action of upward flow and back vortex, and the indexes are divided into range indexes and strength indexes;
s4, establishing an artificial fish reef construction mode index and each flow field effect model; performing unit regression fitting of experimental data by using a fitting function ployfit in MATLAB, establishing a multi-element nonlinear model of flow field volume and reef building indexes by using a nlinfit function, and performing model optimization by using a Gauss-Newton method;
s5, selecting the artificial reef construction mode under the optimal condition of the flow field effect according to the artificial reef construction target by using the obtained artificial reef construction mode and the flow field effect model, and realizing the scale optimization of the artificial reef.
Further, in the step S1, the artificial reefs are configured and combined in a numerical water tank through a numerical simulation experiment, wherein in the numerical simulation, an inlet boundary condition is set as a speed inlet, and an outlet boundary condition is set as a speed outlet; calculating boundary conditions of the bottom surface of the domain and the surface of the artificial fish reef body, wherein the boundary conditions are set as wall surface boundary parameters, and the side surfaces and the upper top surface are set as symmetrical boundary conditions; the model pressure and speed coupling is subjected to iterative computation by adopting a PISO algorithm, and the fluid density in the simulation is set to be 1024kg/m of the typical density of the sea water 3 The gravity parameter is 9.81m/s2, the three-dimensional flow field of the artificial fish reef calculation domain adopts tetrahedron unstructured grids, and grid encryption is carried out on the surface and the periphery of the reef body.
Further, in step S3, the flow field range index includes a flow field relative volume, a relative height, a relative length; the relative volume of the flow field is expressed by the ratio of the volume of the flow field to the volume of the fish reef monomer, and the volume of the flow field is the volume contained in the peripheral envelope surface of the flow field of the target flow velocity and is divided into a combined volume and a sub-volume; the total volume refers to the volume of the entire envelope surface, including the portion that does not reach the upflow flow velocity but is included in the upflow region, for illustrating the overall effect of the flow field effect; the volume dividing means all reach the area volume of the upflow flow velocity standard, the actual control part of the flow field effect in the flow field area is described, meanwhile, the relative flow field volume of the artificial reef monomer is introduced to be used for describing the space effect and the utilization rate of the artificial reef monomer in each layout mode, and the ratio of the average flow field dividing volume to the total throwing amount of the artificial reef is adopted for representation; the relative height of the flow field is expressed by the ratio of the flow field height to the unit artificial fish reef height, and the flow field height is the maximum height of the flow velocity from the bottom of the artificial fish reef to the target flow velocity, so as to explain the space accessibility in the vertical direction; the relative length of the flow field is expressed by the ratio of the length of the flow field to the length of the artificial fish reef monomer, and is used for explaining the space accessibility of the horizontal flow field.
Further, in the step S3, the flow field strength index adopts the ratio of the flow field relative divided volume to the combined volume, the flow velocity, the unit artificial fish reef tail end vortex time interval and the distance from generation to dissipation of small vortex in the back vortex area respectively.
Further, in the step S4, the volume y and the reef building index x are set i (1, 2, … n) establishing an optimal unary regression model function as y=f i (x i ) R through each cell model 2 And F, checking and verifying the reliability; and then superposing the single index models which are qualified in verification one by one according to a multiple linear regression equation form, checking the reliability of the superposition equation, and if the models do not meet the requirements, further considering the interaction among reef building indexes, thereby building a flow field effect multiple regression model, wherein the mathematical expression is as follows:
further, in the step S1, the incoming flow speed is 0.5m/S of the general flow speed of the artificial fish reef area, the incoming flow direction is perpendicular to the forward direction of the unit artificial fish reef, and the outlet speed is set to be-0.5 m/S.
The invention has the beneficial effects that: the system comprehensively provides the artificial reef construction mode index, the flow field effect range and the strength index, establishes the model relation between the two indexes, and provides the artificial reef scale optimization construction method, thereby having practical significance for the artificial reef construction under the strategies of reducing, improving quality and improving effect.
Drawings
FIG. 1 is a flow chart of a scale optimization in accordance with the present invention.
FIG. 2 is a diagram showing the index parameters of the artificial reef in the form of a Chinese character Mi in example 1.
FIG. 3 is the volume of the upflow in example 1.
Fig. 4 is the volume of the back vortex in example 1.
FIG. 5 is a table showing the maximum relative volume of back vortex and the corresponding arrangement pitch in 4 arrangement modes of a unit artificial fish reef.
Detailed Description
The invention will be further described with reference to figures 1-5 and the specific examples.
Example 1
The embodiment is the establishment of an artificial fish reef construction mode and a flow field effect model.
The rice-shaped artificial fish reef is selected for research, and is formed by reinforced concrete into a square artificial fish reef monomer with the side length of 3m, and the permeability characteristic is 27.37 percent (concrete volume/empty square volume). In order to obtain the flow field characteristics of the artificial reefs in various combination modes under different throwing amounts, the artificial reefs are configured and combined in a numerical water tank through a numerical simulation experiment, the flow inlet surface of the numerical water tank is 3 times the side length (Length of unit artificial reef, L) of the unit reef, the tail of the unit reef is 15L to the flow outlet surface, the wall surfaces of the left and right sides of the reef are 3L, and the rising flow field effect is remarkable according to the characteristic that the height of the artificial reef is 1/10 of the water depth, and the height of the numerical water tank is 30m. According to the quantity (T) of artificial fish reef a ) The unit artificial fish reef combination is divided into four types of 4, 9, 16 and 25 according to the number, and the throwing amount of each unit fish reef is respectively 108, 243, 432 and 675 empty m 3 The unit fish reef is in a square layout mode (L) m ) 2×2, 3×3, 4×4, 5×5, respectively, and a layout pitch (L) d ) The two-layer reef layout scheme under the condition that the side length multiple of the artificial reef monomer is expressed as 0.0l, 0.5l, 1.0l, 1.5l, 2.0l, 3.0l and 4.0l respectively, and meanwhile 4 throwing amounts are added at intervals of 0l is used for explaining the flow field effect of the unit artificial reef height difference, and the figure 1 is a schematic diagram of the artificial reef structure in the shape of Chinese character Mi and the artificial reef layout parameters. The inflow speed of the numerical water tank is 0.5m/s of the general flow rate of the artificial fish reef throwing area, and the inflow direction is perpendicular to the forward direction of the reef body combination.
Presented herein as a sheetThe side length and the height of the fish reef are used as the scale index of the artificial fish reef construction, and the unit fish reef volume rate is used as the strength index of the artificial fish reef construction. Wherein the side length of the unit fish reef refers to the boundary length of the artificial fish reef combination area, the fish reef height (Height of artificial reef, H) refers to the average height of the unit artificial fish reef, the Relative side length and the Relative height are used for representing when the model is built, and the Relative side length (L) r ) Refers to the ratio of the side length of the unit artificial reef to the side length of the reef monomer, and the Relative height (H) r ) Refers to the ratio of the unit reef height to the reef unit height. Unit reef volume ratio (Volume ratio of unit artificial reefs, V) R ) Refers to the ratio of the artificial reef throwing amount in the unit reef area to the whole space volume of the unit reef. On the other hand, the artificial reef construction index needs to represent the reef construction effect requirement, the reef construction effect in the research is reflected by different speed flow field effects to be achieved by artificial reef construction, and the up-flow speed ratios (Ratio of upwelling velocity, R u ) Speed ratio to back vortex (Ratio of back eddy velocity, R b ) The values indicate that the upflow speed ratios are 0.05, 0.10, 0.15 and 0.20, respectively, and the back vortex speed ratios are 0.80, 0.85, 0.90 and 0.95, respectively.
Based on the flow field data of the artificial fish reef obtained by simulation under each layout condition, the upflow and back vortex volume under different standards are selected as flow field effect indexes due to the difference of requirements on the effect of the artificial fish reef. The vertical velocity is respectively smaller than 0.05, 0.10, 0.15 and 0.20 times of the incoming flow velocity area is selected as an ascending flow effect area, the absolute value of the flow velocity in the incoming flow direction is respectively smaller than 0.80, 0.85, 0.90 and 0.95 times of the incoming flow velocity area is selected as a back vortex effect area, the flow field volume under each velocity ratio is calculated according to the standard, the flow field volume refers to the volume of an envelope surface surrounded by the effective velocity, and the numerical experimental result average value of 100-110s is used as the flow field volume calculation value. FIG. 3 is a schematic view of the selection of upflow and back vortex flow field volumes, both of which are calculated by MATLAB program, the flow field volumes being expressed in terms of relative volumes at the time of model creation, upflow relative volumes (Relative upwelling volume, V) u ) Finger upflow flow field volume and artificial fish reefRatio of monomer volumes, back vortex relative volume (Relative back eddy volume, V b ) Refers to the ratio of the back vortex flow field volume to the artificial fish reef monomer volume.
In order to build a flow field volume comprehensive evaluation model, the study firstly proposes to build a multiple nonlinear regression model of a plurality of independent variables (each artificial fish reef construction index) and a dependent variable (flow field volume) by using a mathematical statistics method, and the flow field volume mathematical model is built by adopting a single index method. The single index method is to separately consider the relation between each reef building index and the flow field volume and respectively build a flow field volume optimal single index regression model. Set volume y and reef building index x i (1, 2, … n) establishing an optimal unary regression model function as y=f i (x i ) The reliability of each unit model is verified by the R2 and F test. And then superposing the single index models which are qualified in verification one by one according to a multiple linear regression equation form, checking the reliability of the superposition equation, and if the models do not meet the requirements, further considering the interaction among reef building indexes, thereby building a flow field volume multiple regression model, wherein the mathematical expression is shown as a formula 1-1. The single index method is adopted to build the volume model, so that the degree of coincidence between the volume model and the actual situation is high, and the physical meaning of the model can be conveniently explained. The study utilizes a fitting function ployfit in MATLAB to carry out unit regression fitting of experimental data, an nlinfit function is applied to establish a multi-element nonlinear model of flow field volume and reef building indexes, and a Gauss-Newton method is used for model optimization. Model establishment is completed by regression coefficient R 2 The relative error and model limit numerical significance illustrate the model reliability.
And selecting the artificial reef construction mode under the optimal condition of the flow field effect according to the artificial reef construction target by using the obtained artificial reef construction mode and the flow field effect model, so as to realize the scale optimization of the artificial reef.
Example 2
The artificial fish reef construction planning scheme based on the flow field effect comprehensive evaluation model and aiming at breeding the typical releasing fish species black sea bream in the east sea area is briefly described below. The black sea bream likes to perch in the sediment and the bottom layer of the multi-rock reef substrate water area, and the dynamic distribution trend experiment of the young black sea bream in the artificial fish reef water tank is analyzed to determine the liked area of the black sea breamThe method is mainly used for calculating the back vortex flow area, and the flow speed is 0.72-0.80 times of the background flow speed, so that the main task of the plan is to calculate the artificial fish reef construction mode when the back vortex flow is the maximum volume under the target flow speed. The water depth of the planned artificial fish reef throwing area is 30m, the average flow velocity is 0.5m/s, the substrate type is silt sand, the artificial fish reef construction requirement is met, and the artificial fish reef throwing amount is 5000 empty m 3 The fish reef is of the type described herein in the shape of a Chinese character 'mi'.
According to the back vortex volume regression model, the back vortex maximum relative volumes and the corresponding layout intervals in the 4 layout modes are calculated as shown in table 1. When the layout modes are respectively 2×2, 3×3, 4×4 and 5×5, the range of the layout interval corresponding to the maximum relative volume under the condition of the target speed ratio is respectively 1.79-1.99, 1.88-2.06, 1.71-1.83 and 1.46-1.54 times, and the trend of increasing and decreasing is presented.
1) The relative volume of the artificial reef monomer flow field represents the action efficiency of the artificial reef, if the relative volume of the artificial reef monomer flow field is only used as the selection basis of the construction mode, the less the unit artificial reef is put, the stronger the utilization rate and the action effect of the reef are, and the best the action efficiency of the reef is when the relative height is 2 in the 2 x 2 mode, and the unit artificial reef is put in the unit of 216 empty m 3 . However, the ecological effect can be reflected only when the artificial reef is put up to a certain construction scale, and the unit artificial reef amount in the artificial reef construction in China is set according to Japanese artificial reef putting standards, and the unit artificial reef putting amount is required to be more than 400 empty m 3 The eastern sea area is generally 600 empty m 3 Left and right, therefore, the 2×2 mode is optimal considering only the reef flow field effect and ignoring the ecological effect is not available.
2) If the throwing amount is used as the first standard, when the distribution mode is 3×3, the relative height is 2, the distribution mode is 4×4, the relative heights are 1 and 2, and the relative heights are 5×5, namely 1 and 2, the throwing amount of unit artificial fish reef meets the requirement of throwing amount of unit artificial fish reef, namely 486, 432, 864, 675 and 1350 empty m 3 The average action efficiencies of the artificial reef monomers in the 5 modes are 5.73, 4.02, 3.93, 3.17 and 3.05 respectively, wherein the action efficiency of the reef monomers is highest when the relative height of the reef monomers is 2 in the 3X 3 mode, and the action efficiency of the artificial reef monomers in the other two modes is 1 in the relative heightThe ratio is higher than the value with the relative height of 2, the operation efficiency generated by the unit reef throwing amount when the layout mode is 5 multiplied by 5 and the relative height is 2 is obviously lower than the reef operation efficiency under the corresponding throwing amount of other modes, the reef waste phenomenon occurs, and other 4 construction modes can be considered.
3) The construction height of the unit artificial fish reef is generally required to be greater than 1/10 and less than 1/3 of the sea water depth. The water depth is 30m, the heights of the unit artificial fish reefs in 4 construction modes are 3m and 6m respectively and are between 3 and 10m, and the height requirement condition is met. In the artificial fish reef construction process, unit fish reefs are formed at first, and unit artificial fish reefs are arranged at certain intervals to form a fish reef group which is the basic scale of the artificial fish reef to exert the resource proliferation effect. According to the existing research on the arrangement space of the artificial reefs in the shape of a Chinese character 'mi', when the arrangement space is more than 4 times, the flow field effect between adjacent reef units along the incoming flow direction has no synergistic effect, so that the unit reef interval forming the reef group is more than 4 times of the side length of the reef unit, namely more than 12m, and meanwhile, the research indicates that the unit reef interval is 100-200m. The 4 mode unit artificial reefs are arranged into a reef group according to the interval of 100m, the lengths of the reef group are 1100, 1280, 780 and 930m respectively, and the lengths of the 4 reef groups are all in accordance with the planned construction range of the artificial reefs in the general sea area. The total back vortex relative volumes constituting the 0.72-0.80 times speed ratio are 882-1221, 587-883, 613-942 and 433-717, respectively, so that the total volume of the flow field is maximum when the unit fish reef is 3×3 at a relative height of 2, the arrangement mode is 4×4 and the relative height is 2, then the relative height is 1, and the volume of the flow field is minimum when the arrangement mode is 5×5 and the relative height is 1, so that the volume of the flow field is larger when the unit artificial fish reef is 2. However, when the relative height is 2, two artificial fish reef monomers are actually overlapped, and the difficulty in on-site construction is high, so that the construction effect is optimal when the relative height is 2 in a 3×3 layout mode if construction conditions allow; if the construction conditions are difficult, the construction effect is optimal when the relative height is 1 in the 4×4 layout mode.
It is to be understood that while the spirit and principles of the invention have been described in connection with several embodiments, it is to be understood that this invention is not limited to the specific embodiments disclosed nor does it imply that the features of these aspects are not combinable and that such is for convenience of description only. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (5)
1. The artificial fish reef scale effect evaluation method is characterized by comprising the following steps of:
s1, obtaining artificial fish reef flow field effect data of various construction modes through a numerical simulation experiment;
s2, extracting an artificial reef construction mode index according to experimental conditions, wherein the artificial reef construction mode index is divided into an artificial reef construction scale index and an artificial reef construction strength index;
the artificial reef construction scale indexes comprise unit reef side length and height, arrangement interval, throwing amount and permeability, wherein the unit reef side length refers to the boundary length of an artificial reef combination area, the opposite side length refers to the ratio of the unit artificial reef side length to the reef single side length, the reef height refers to the average height of the unit artificial reef, and the relative height refers to the ratio of the unit reef height to the reef single height; the artificial fish reef throwing quantity refers to throwing all artificial fish reef blocks in a certain range of the sea area; the arrangement space refers to the distance between artificial reef units and is expressed by the side length multiple of the artificial reef units; the permeability refers to the ratio of the volume of the single concrete of the artificial fish reef to the volume of the empty space of the single concrete of the artificial fish reef, and represents the circulation degree of the artificial fish reef;
the artificial reef construction strength index comprises a unit reef volume rate, a enclosing degree, a staggered degree and a flow area ratio; wherein the unit reef volume rate refers to the ratio of the unit reef area artificial reef throwing amount to the whole space volume of the unit reef, the enclosure degree refers to the ratio of the sum of the peripheral lengths of all the outer side reefs of the reef stack in a certain range to the whole peripheral line, the stagger degree refers to the height difference between the average height and the highest height of the artificial reef stack in a certain range, and the facing flow area ratio R f The ratio of the area of the facing flow of the artificial fish reef to the occupied area of the reef pile is as follows: r is R f (a)＝A F /A T The method comprises the steps of carrying out a first treatment on the surface of the Wherein A is F Representing the area of the front flow-facing area of the artificial reef facing the direction a, A T Representing the total reef land area;
s3, determining corresponding flow field effect indexes by taking an artificial fish reef construction target as a standard, wherein the flow field effect is expressed as the action of upward flow and back vortex, and the indexes are divided into range indexes and strength indexes;
s4, establishing an artificial fish reef construction mode index and each flow field effect model; performing unit regression fitting of experimental data by using a fitting function ployfit in MATLAB, establishing a multi-element nonlinear model of flow field volume and reef building indexes by using a nlinfit function, and performing model optimization by using a Gauss-Newton method;
s5, selecting the artificial reef construction mode under the optimal condition of the flow field effect according to the artificial reef construction target by using the obtained artificial reef construction mode and the flow field effect model, and realizing the scale optimization of the artificial reef.
2. The method for evaluating the scale effect of an artificial fish reef according to claim 1, wherein: in the S1 step, configuring and combining the artificial fish reefs in a numerical water tank through a numerical simulation experiment, wherein in the numerical simulation, an inlet boundary condition is set as a speed inlet, and an outlet boundary condition is set as a speed outlet; calculating boundary conditions of the bottom surface of the domain and the surface of the artificial fish reef body, wherein the boundary conditions are set as wall surface boundary parameters, and the side surfaces and the upper top surface are set as symmetrical boundary conditions; the model pressure and speed coupling is subjected to iterative computation by adopting a PISO algorithm, and the fluid density in the simulation is set to be 1024kg/m of the typical density of the sea water 3 The gravity parameter is 9.81m/s2, the three-dimensional flow field of the artificial fish reef calculation domain adopts tetrahedron unstructured grids, and grid encryption is carried out on the surface and the periphery of the reef body.
3. The method for evaluating the scale effect of an artificial fish reef according to claim 1, wherein: in the step S3, the flow field range indexes comprise the relative volume, the relative height and the relative length of the flow field; the relative volume of the flow field is expressed by the ratio of the volume of the flow field to the volume of the fish reef monomer, and the volume of the flow field is the volume contained in the peripheral envelope surface of the flow field of the target flow velocity and is divided into a combined volume and a sub-volume;
the total volume refers to the volume of the entire envelope surface, including the portion that does not reach the upflow flow velocity but is included in the upflow region, for illustrating the overall effect of the flow field effect;
the volume dividing means all reach the area volume of the upflow flow velocity standard, the actual control part of the flow field effect in the flow field area is described, meanwhile, the relative flow field volume of the artificial reef monomer is introduced to be used for describing the space effect and the utilization rate of the artificial reef monomer in each layout mode, and the ratio of the average flow field dividing volume to the total throwing amount of the artificial reef is adopted for representation;
the relative height of the flow field is expressed by the ratio of the flow field height to the unit artificial fish reef height, and the flow field height is the maximum height of the flow velocity from the bottom of the artificial fish reef to the target flow velocity, so as to explain the space accessibility in the vertical direction;
the relative length of the flow field is expressed by the ratio of the length of the flow field to the length of the artificial fish reef monomer, and is used for explaining the space accessibility of the horizontal flow field.
4. A method of evaluating an artificial fish reef scale effect according to claim 3, wherein: in the step S3, the flow field intensity index adopts the ratio of the flow field relative divided volume to the combined volume, the flow velocity, the vortex time interval at the tail end of the unit artificial fish reef and the distance from generation to dissipation of small vortices in the back vortex area respectively.
5. The method for evaluating the scale effect of the artificial fish reef according to claim 2, wherein: in the step S1, the incoming flow speed is 0.5m/S of the general flow speed of the artificial fish reef area, the incoming flow direction is perpendicular to the forward direction of the unit artificial fish reef, and the outlet speed is set to be-0.5 m/S.
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