Apparatus and method for quickly identifying vertically mixed areas of pollutants

Abstract

An apparatus and method for rapidly identifying a sea area with vertical mixing of pollutants are disclosed. The method for rapidly identifying a sea area with vertical mixing of pollutants includes the steps of: acquiring past observation data of a sea area to be identified; for a plurality of points in the sea area to be identified, substituting the acquired past observation data into a preset formula for determining whether full-depth mixing occurs and performing calculations; and, based on the calculation results, identifying an area of ​​points where the calculated value is less than or equal to a preset threshold value as a sea area with smooth vertical mixing of pollutants, and identifying an area of ​​points where the calculated value exceeds a preset threshold value as a sea area with restricted vertical mixing of pollutants.

Description

Technology Field

[0001] The present invention relates to a rapid identification device and method for vertically mixed pollutant sea areas. Background Technology

[0002] Areas with active vertical mixing facilitate efficient seawater exchange between the upper and lower layers, resulting in high nutrient content and abundant marine resources, which in turn leads to high productivity of fishery products. Conversely, if pollutants are introduced into these areas, the active seawater exchange can cause the contamination to spread rapidly across the entire depth. Therefore, to manage the environmental impact of marine pollution, it is necessary to promptly identify areas with efficient vertical mixing and establish optimal management strategies.

[0003] In areas with fast currents and shallow water, the bottom mixed layer formed by the current is thick and overlaps with the surface mixed layer formed by the wind. In such areas where the surface and bottom mixed layers overlap, mixing occurs throughout the entire water depth, resulting in smooth seawater exchange between the upper and lower layers.

[0004] Generally, a method for finding areas where vertical mixing is effective is to compare water temperatures at all depths and consider areas where the water temperatures at all depths are similar to a certain level as areas of full-depth mixing, and areas other than the areas of full-depth mixing as stratospheric areas. To do this, water temperatures at all depths must be observed for the areas to be searched, which requires a lot of time and cost. Prior art literature

[0005] Korean Patent Publication No. 10-2023-0055765 (April 26, 2023) The problem to be solved

[0006] The present invention aims to provide a rapid identification device and method for vertical mixing areas of pollutants, which identify areas of smooth and restricted vertical mixing of pollutants using a numerical tidal current model derived from the relationship between current velocity and water depth and historical observation data. means of solving the problem

[0007] According to one aspect of the present invention, a method for rapidly determining a vertically mixed pollutant area is disclosed, which is performed by a rapid determination device for a vertically mixed pollutant area.

[0008] A method for rapidly determining a sea area with vertical mixing of pollutants according to an embodiment of the present invention comprises: a step of acquiring past observation data of a sea area to be determined; a step of calculating for a plurality of points in the sea area to be determined by substituting the acquired past observation data into a preset formula for determining whether full-depth mixing occurs; and a step of determining, based on the calculation result, an area of ​​points where the calculated value is less than or equal to a preset reference value as a sea area with smooth vertical mixing of pollutants, and an area of ​​points where the calculated value exceeds a preset reference value as a sea area with restricted vertical mixing of pollutants.

[0009] The aforementioned acquired historical observation data includes the seafloor friction coefficient of the sea area to be identified, the reference density prior to temperature change, specific heat, contribution ratio, volume expansion coefficient, and the rate of change of heat absorbed per unit area.

[0010] The above formula for determining whether the total depth is mixed is established by the following mathematical formula, which is the relationship between the current velocity and the water depth.

[0011]

[0012] Here, h is the water depth and u is the current velocity.

[0013] The reference value of the above formula for determining whether the total depth is mixed is calculated using the following mathematical formula.

[0014]

[0015] Here, k is the seafloor friction coefficient, ρ0 is the reference density before the temperature change, and C p is specific heat, and is the contribution ratio, α is the coefficient of volume expansion, g is the acceleration due to gravity, and dQ / dt is the rate of change of heat absorbed per unit area.

[0016] According to another aspect of the present invention, a rapid identification device for vertically mixed pollutant sea areas is disclosed.

[0017] A rapid identification device for a vertically mixed pollutant sea area according to an embodiment of the present invention comprises a memory for storing instructions and a processor for executing instructions, wherein the instructions perform a rapid identification method for a vertically mixed pollutant sea area comprising the steps of: acquiring past observation data of a sea area to be identified; substituting the acquired past observation data into a preset formula for determining whether full-depth mixing occurs for a plurality of points of the sea area to be identified and calculating; and, based on the calculation result, identifying an area of ​​points where the calculated value is less than or equal to a preset reference value as a sea area where vertical mixing of pollutants is smooth, and identifying an area of ​​points where the calculated value exceeds a preset reference value as a sea area where vertical mixing of pollutants is restricted. Effects of the invention

[0018] The apparatus and method for rapidly identifying areas of vertical mixing of pollutants according to an embodiment of the present invention can identify areas of smooth vertical mixing of pollutants and restricted areas relatively easily and quickly without performing direct observations in the ocean by using a numerical model of tidal currents derived from the relationship between the current velocity and water depth and past observation data. Brief explanation of the drawing

[0019] FIG. 1 is a flowchart schematically illustrating a method for rapidly identifying a vertically mixed sea area of ​​pollutants performed by a rapid identification device for vertically mixed sea areas of pollutants according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a method for rapidly identifying a vertically mixed sea area of ​​pollutants according to an embodiment of the present invention of FIG. 1. FIG. 3 is a diagram schematically illustrating the configuration of a rapid identification device for vertically mixed pollutant sea areas according to an embodiment of the present invention. Specific details for implementing the invention

[0020] As used in this specification, singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "composed" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be excluded, or that additional components or steps may be included. Furthermore, terms such as "...part," "module," etc., as used in the specification refer to a unit that processes at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

[0021] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings.

[0022] FIG. 1 is a flowchart schematically illustrating a method for rapidly identifying a vertically mixed sea area of ​​pollutants performed by a rapid identification device for vertically mixed sea areas of pollutants according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining the method for rapidly identifying a vertically mixed sea area of ​​pollutants according to an embodiment of the present invention of FIG. 1. Hereinafter, the method for rapidly identifying a vertically mixed sea area of ​​pollutants according to an embodiment of the present invention will be explained with reference to FIG. 1, but with reference to FIG. 2.

[0023] In step S110, the rapid identification device for vertically mixed pollutant areas acquires historical observation data of the area to be identified. For example, the rapid identification device for vertically mixed pollutant areas can acquire historical observation data from databases such as the National Oceanographic Survey and the United States Geological Survey (USGS).

[0024] In step S120, the rapid identification device for vertically mixed pollutant areas calculates by substituting acquired past observation data for multiple points in the area to be identified into a preset formula for determining whether full-depth mixing has occurred.

[0025] Here, the total depth mixing discriminant can be established as a relationship between the current velocity and the water depth, as shown in the following mathematical formula.

[0026]

[0027] Here, h is the water depth and u is the current velocity.

[0028] In step S130, the rapid identification device for pollutant vertical mixing areas identifies the area of ​​points where the calculated value is below a preset threshold value as a pollutant vertical mixing smooth area, and identifies the area of ​​points where the calculated value exceeds the preset threshold value as a pollutant vertical mixing restricted area.

[0029] Hereinafter, with reference to FIG. 2, the total depth mixing discrimination formula will be explained.

[0030] The persistence of a tidal front can be influenced by tidal mixing. Thus, referring to Figure 2, when heat of q is introduced into the seawater, the density of the upper layer from the sea surface to a depth Δh changes by Δρ.

[0031] It can be assumed that an energy supply of V2-V1 is required for the upper layer, whose density has changed by Δρ, to mix with the lower layer so that the water column up to depth h' has a density of ρ'. Here, V1 and V2 are the potential energies before and after the mixing of the upper and lower layers, respectively.

[0032] Here, V1 = potential energy when the density of the entire water column is ρ - potential energy when the density of the upper layer is Δρ smaller + atmospheric pressure.

[0033] Here, the potential energy when the total density of the water column is ρ can be expressed by the following mathematical formula.

[0034]

[0035] And, the potential energy when the density of the upper layer is smaller by Δρ is the potential energy when the density of the entire water column is Δρ minus the potential energy of the lower layer, and can be expressed by the following mathematical formula.

[0036]

[0037] Therefore, V1 and V2 can be expressed by the following mathematical formula.

[0038]

[0039] Here, Δh< <h라고 가정하면 and, h=h' and, P a is atmospheric pressure.

[0040] Therefore, the difference in potential energy before and after vertical mixing can be expressed by the following mathematical formula.

[0041]

[0042] Meanwhile, according to the law of conservation of energy, the following mathematical equation is satisfied.

[0043]

[0044] Accordingly, the difference in potential energy before and after vertical mixing can be expressed by the following mathematical formula.

[0045]

[0046] Below, since the difference in density between the upper and lower layers is due to the difference in heat quantity, we will convert Equation 7 into a relationship of heat quantity.

[0047] In general, the following mathematical equation holds between density ρ, temperature T, and heat quantity Q.

[0048]

[0049] Here, Q is the amount of heat absorbed per unit area, and C p ε is the specific heat, ρ0 is the reference density before the temperature change, α is the coefficient of volume expansion, and ΔT is the difference in temperature change.

[0050] Based on this relationship, mathematical formula 7 can be expressed as the following mathematical formula.

[0051]

[0052] Therefore, the rate of change of potential energy dv / dt can be expressed by the following mathematical formula.

[0053]

[0054] For mixing to occur, an amount of energy approximately equal to that in Equation 10 must be continuously supplied. It is assumed that this energy is bottom turbulence energy caused by tides. Near the seafloor, the current velocity u b Phosphoric algae bottom friction (bottom stress) τ b The average power contributing to it can be expressed by the following mathematical formula.

[0055]

[0056] Here, E is the energy of the water column per unit area, and bar(￣) represents the average over time.

[0057] And, bottom stress τ b It can be approximated as a quadratic function of the flow velocity as shown in the following mathematical formula.

[0058]

[0059] Here, k is the non-dimensional seafloor friction coefficient, and empirically, 0.0025 can be applied.

[0060] Therefore, the average power can be expressed by the following mathematical formula.

[0061]

[0062] U b When (t) = u0cos(wt), it can be expressed by the following mathematical formula.

[0063]

[0064] Applying this to average power, it can be expressed as the following mathematical formula.

[0065]

[0066] Since not all of this energy contributes to the change in potential energy, the contribution ratio Let us assume that. Then, it can be expressed as the following mathematical formula.

[0067]

[0068] From this, the reference value of the total depth mixture discrimination formula can be derived as shown in the following mathematical formula.

[0069]

[0070] Therefore, the acquired historical observation data of the sea area to be identified includes the seafloor friction coefficient k, the reference density ρ0 prior to temperature change, and the specific heat C p , contribution ratio It may include the coefficient of volume expansion α and the rate of change of heat absorbed per unit area dQ / dt.

[0071] FIG. 3 is a diagram schematically illustrating the configuration of a rapid identification device for vertically mixed pollutant sea areas according to an embodiment of the present invention.

[0072] Referring to FIG. 3, a rapid identification device for a vertically mixed sea area of ​​pollutants according to an embodiment of the present invention includes a processor (10), a memory (20), a communication unit (30), and an interface unit (40).

[0073] The processor (10) may be a CPU or a semiconductor device that executes processing instructions stored in memory (20).

[0074] The memory (20) may include various types of volatile or non-volatile memory media. For example, the memory (20) may include ROM, RAM, etc.

[0075] For example, memory (20) can store instructions for performing a rapid identification method for a vertically mixed sea area of ​​pollutants according to an embodiment of the present invention.

[0076] The communication unit (30) is a means for transmitting and receiving data with other devices through a communication network.

[0077] The interface section (40) may include a network interface and a user interface for connecting to a network.

[0078] Meanwhile, the components of the aforementioned embodiments can be easily identified from a process perspective. That is, each component can be identified as a separate process. Furthermore, the processes of the aforementioned embodiments can be easily identified from the perspective of the device components.

[0079] In addition, the technical details described above may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., either individually or in combination. The program instructions recorded on the medium may be those specifically designed and configured for the embodiments, or they may be those known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc. Hardware devices may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

[0080] The embodiments of the present invention described above are disclosed for illustrative purposes only, and those skilled in the art with ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims. Explanation of the symbols

[0081] 10: Processor 20: Memory 30: Communications Department 40: Interface section

Claims

Claim 1 A method for rapidly determining a vertically mixed pollutant area performed by a rapid determination device for a vertically mixed pollutant area comprises: a step of acquiring past observation data of a sea area to be determined; a step of calculating for a plurality of points in the sea area to be determined by substituting the acquired past observation data into a preset formula for determining full-depth mixing; and a step of determining, based on the calculation result, an area of ​​points where the calculated value is less than or equal to a preset reference value as a sea area where vertical mixing of pollutants is smooth, and an area of ​​points where the calculated value exceeds a preset reference value as a sea area where vertical mixing of pollutants is restricted, wherein the acquired past observation data includes the seabed friction coefficient, reference density before temperature change, specific heat, contribution ratio, volume expansion coefficient, and rate of change of heat absorbed per unit area of ​​the sea area to be determined, and the formula for determining full-depth mixing is set by the following mathematical formula, which is a relationship between the current velocity and the water depth. A method for rapidly determining a vertically mixed sea area of ​​pollutants, characterized in that, where h is the water depth and u is the current velocity, the reference value of the above-mentioned formula for determining whether the entire water depth is mixed is calculated using the following mathematical formula. Here, k is the seafloor friction coefficient, ρ0 is the reference density before the temperature change, and C p is specific heat, and is the contribution ratio, α is the coefficient of volume expansion, g is the acceleration due to gravity, and dQ / dt is the rate of change of absorbed heat per unit area. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A rapid identification device for a vertical mixing area of ​​pollutants comprises: a memory for storing instructions; and a processor for executing instructions, wherein the instructions include: a step of acquiring past observation data of a sea area to be identified; a step of calculating for a plurality of points of the sea area to be identified by substituting the acquired past observation data into a preset formula for determining full-depth mixing; and a step of identifying, based on the calculation result, an area of ​​points where the calculated value is less than or equal to a preset reference value as a sea area where vertical mixing of pollutants is smooth, and an area of ​​points where the calculated value exceeds a preset reference value as a sea area where vertical mixing of pollutants is restricted. The acquired past observation data includes the seabed friction coefficient, reference density before temperature change, specific heat, contribution ratio, volume expansion coefficient, and rate of change of heat absorbed per unit area of ​​the sea area to be identified, and the formula for determining full-depth mixing is set by the following mathematical formula, which is a relationship between the current velocity and the water depth. A rapid detection device for vertically mixed pollutant sea areas, characterized in that, where h is the water depth and u is the current velocity, the reference value of the above-mentioned formula for determining whether the entire water depth is mixed is calculated using the following mathematical formula. Here, k is the seafloor friction coefficient, ρ0 is the reference density before the temperature change, and C p is specific heat, and is the contribution ratio, α is the coefficient of volume expansion, g is the acceleration due to gravity, and dQ / dt is the rate of change of absorbed heat per unit area.

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