Method and system for constructing characteristics of influence of isolated waves in ocean on underwater sound propagation loss

Abstract

The invention discloses a method and a system for constructing a characteristic of influence of a solitary wave on underwater sound propagation loss in an ocean. The method comprises the following steps: acquiring acoustic environment parameters of a specified simulated ocean area to construct an ocean acoustic environment; constructing a plurality of internal solitary wave structures according to the internal solitary wave characteristic parameters; combining the marine acoustic environment and the internal solitary wave structure to construct a plurality of internal solitary environment models; setting a sound source and a receiver, and calculating a sound field by adopting a kraken model based on the internal isolated environment models and the set sound source and receiver to obtain sound propagation loss of each internal isolated environment model; and comparing and analyzing the sound propagation loss of various internal isolated environment models to obtain the influence of the internal isolated waves on the sound propagation loss characteristics. The invention aims to improve the accuracy of the characteristic data of the underwater sound propagation loss influenced by the marine internal solitary wave based on the influence of the internal solitary wave characteristic parameters on the sound propagation loss.

Description

Technical Field

[0001] The present invention relates to sound propagation technology in the field of marine environment, and in particular to a method and system for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean. Background Art

[0002] Sound waves are currently the only form of energy that can propagate over long distances underwater, and they play a vital role in many fields, including underwater target detection, information transmission, marine environment monitoring, and the development of marine resources. The underwater sound propagation characteristics have a decisive influence on accurate target positioning, effective detection, reliable underwater communications, and underwater confrontation activities. Among them, the underwater sound propagation loss characteristics will determine the range of sonar. The marine environment has a significant impact on the underwater sound propagation loss characteristics, which in turn affects the performance of sonar. Internal solitary waves are a common nonlinear, large-amplitude fluctuation phenomenon that is widely present in the global ocean. They have the characteristics of short period and fast flow. The spatial scale in the horizontal direction can reach more than ten kilometers, and the amplitude in the vertical direction can reach hundreds of meters. Internal solitary waves can severely disturb the temperature and salinity distribution in the water body, causing the sound velocity profile to have obvious distance dependence, resulting in modal coupling of sound waves in the internal isolated environment, which in turn causes abnormal changes in the sound propagation characteristics, such as fluctuations in sound propagation loss and decreased space-time correlation of the sound field. Studying the characteristics of internal solitary sound propagation loss can improve sonar detection capabilities, provide auxiliary decision-making for underwater submersible path planning, etc. It is extremely important to achieve the optimal adaptation of hydroacoustic equipment and the marine environment, and maximize the efficiency of hydroacoustic equipment. At present, the methods for studying the influence of internal solitary waves on sound propagation characteristics mainly include measured data analysis method, numerical simulation analysis method, etc. The method of directly observing the sound propagation loss data in the internal solitary wave environment using instruments such as hydroacoustic receiving arrays and temperature chains to obtain the characteristics of internal solitary waves on sound propagation has high accuracy, but there are problems such as insufficient data volume and high implementation costs. The numerical simulation method can simulate the internal solitary wave structure by setting the internal solitary wave characteristic parameters, and obtain the sound propagation characteristic data in the internal solitary wave environment in combination with the acoustic environment of the relevant sea area. In recent years, the KdV equation (see references: Apel, JR; Ostrovsky, LA; Stepanyants, YA; Lynch, JF Internal solitons in the ocean and their effect on underwater sound. J. Acoust. Soc. Am. 2007, 121, 695-722) is often used to represent the internal solitary wave structure in shallow water environments. However, the effect of the characteristic parameters of internal solitary waves on sound propagation loss has not been fully revealed so far. Summary of the invention

[0003] Technical problem to be solved by the present invention: In view of the above-mentioned problems in the prior art, a method and system for constructing the characteristics of the underwater sound propagation loss affected by internal solitary waves in the ocean are provided. The present invention aims to improve the accuracy of the characteristic data of the underwater sound propagation loss affected by internal solitary waves in the ocean based on the influence of the characteristic parameters of the internal solitary waves on the sound propagation loss.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean, comprising the following steps: Acquire the acoustic environment parameters of the specified simulated ocean area to construct the ocean acoustic environment; Construct various internal solitary wave structures according to the characteristic parameters of internal solitary waves; Combining the ocean acoustic environment and internal solitary wave structure, a variety of internal isolated environment models are constructed; Set up sound sources and receivers, and use the Kraken model to calculate the sound field based on the internal isolated environment model and the set sound sources and receivers to obtain the sound propagation losses of various internal isolated environment models; Comparative analysis of the sound propagation losses of various internally isolated environment models reveals the influence of internally isolated waves on the characteristics of sound propagation losses. The method of constructing a plurality of internal solitary wave structures according to the characteristic parameters of the internal solitary wave comprises: firstly determining the type of the internal solitary wave structure according to the number of internal solitary waves, the amplitude of the internal solitary wave and the polarity of the internal solitary wave, wherein the number of internal solitary waves corresponds to two types of internal solitary wave structures, namely, solitons and wave trains; the amplitude of the internal solitary wave corresponds to two types of internal solitary wave structures, namely, large-amplitude internal solitary waves and small-amplitude internal solitary waves; and the polarity of the internal solitary wave corresponds to two types of internal solitary wave structures, namely, concave-type internal solitary waves and convex-type internal solitary waves; and then constructing a plurality of internal solitary wave structures according to the type of the internal solitary wave structure in combination with the KdV equation shown in the following formula: , In the above formula, is the internal solitary wave amplitude, is the initial internal solitary wave amplitude, is the hyperbolic secant function, is the moving speed of the internal solitary wave, is the initial time, is the current time, is the characteristic width of the internal solitary wave.

[0005] Optionally, the acoustic environment parameters of the designated simulated ocean area include seawater sound velocity, seabed sound velocity, seabed density and seabed absorption coefficient of the designated simulated ocean area.

[0006] Optionally, the seabed sound speed includes the above-cline sound speed, the above-cline sound speed and the below-cline sound speed.

[0007] Optionally, the combining of the ocean acoustic environment and the internal solitary wave structure to construct a plurality of internal isolated environment models comprises: inputting the internal solitary wave structure into the ocean acoustic environment so that the internal solitary wave structure causes disturbance to the sound velocity distribution of the seawater in the vertical direction to form an internal isolated environment model, and the function expression of the sound velocity field distribution in the internal isolated environment model is: , , In the above formula, is the sound velocity field distribution function, is the radius, For depth, is the seawater velocity above the jump layer, is the velocity of seawater below the thermocline, is the depth of the upper seawater, is the depth of the lower seawater, is the transition layer thickness, is the seawater sound velocity gradient in the thermocline, It is the depth boundary of the bottom water body.

[0008] Optionally, the setting of the sound source and the receiver, and the use of the kraken model to calculate the sound field based on the internal isolated environment model and the set sound source and receiver to obtain the sound propagation loss of various internal isolated environment models include: setting the sound source frequency, the sound source position and the sound source depth of the sound source, and setting the receiver position and the receiver depth of the receiver; using the kraken model to calculate the sound field based on the internal isolated environment model and the set sound source and receiver; converting the sound pressure obtained by the sound field calculation into the sound propagation loss according to the following formula: , In the above formula, is the sound transmission loss, is the sound pressure, is the radius, For depth.

[0009] Optionally, the comparative analysis of the sound propagation losses of various internal isolated environment models to obtain the characteristic influence of the internal solitary wave on the sound propagation loss includes: for the internal isolated environment models corresponding to the two types of internal solitary wave structures, i.e., solitons and wave trains, corresponding to the number of internal solitary waves, respectively obtaining the sound propagation losses corresponding to different distances above and below the jump layer, and constructing curves of the sound propagation losses corresponding to different distances to evaluate the characteristic influence of the internal solitary wave on the sound propagation loss; for the internal isolated environment models corresponding to the two types of internal solitary wave structures, i.e., large-amplitude internal solitary waves and small-amplitude internal solitary waves corresponding to the amplitude of the internal solitary wave, respectively obtaining the sound propagation losses corresponding to different distances above and below the jump layer, and constructing curves of the sound propagation losses corresponding to different distances to evaluate the characteristic influence of the internal solitary wave on the sound propagation loss; for the internal isolated environment models corresponding to the two types of internal solitary wave structures, i.e., concave internal solitary waves and convex internal solitary waves corresponding to the polarity of the internal solitary wave, respectively obtaining the sound propagation losses corresponding to different distances above and below the jump layer, and constructing curves of the sound propagation losses corresponding to different distances to evaluate the characteristic influence of the internal solitary wave on the sound propagation loss.

[0010] In addition, the present invention also provides a system for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean, comprising a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the method for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean.

[0011] In addition, the present invention also provides a computer-readable storage medium, which stores a computer program or instruction, and the computer program or instruction is programmed or configured to execute the method of constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean through a processor.

[0012] In addition, the present invention also provides a computer program product, including a computer program or instructions, which are programmed or configured to execute the method of constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean through a processor.

[0013] Compared with the prior art, the present invention mainly has the following advantages: the method of the present invention includes selecting sea acoustic environment parameters according to the specified ocean area; forming the ocean acoustic environment according to the selected acoustic environment parameters; constructing the internal solitary wave structure according to the input internal solitary wave characteristic parameters; setting the sound source and receiver conditions in the internal isolated environment model; calculating the sound field based on the kraken model and obtaining the sound propagation loss result; comparing and analyzing the sound propagation loss results in different internal isolated environments, and obtaining the influence of the internal solitary wave on the sound propagation loss characteristics. The present invention can construct the underwater sound propagation loss characteristics under the influence of internal solitary waves with universal applicability, and can improve the accuracy of the characteristic data of the underwater sound propagation loss affected by the internal solitary waves in the ocean based on the influence of the internal solitary wave characteristic parameters on the sound propagation loss, thereby providing a reference for the effect of the internal solitary wave on the sound propagation, and providing theoretical support for studying the sound propagation loss characteristics under different characteristic internal solitary wave environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the basic flow of the method of the embodiment of the present invention.

[0015] Figure 2 Schematic diagram of an internal solitary wave environment model during the study period in an embodiment of the present invention.

[0016] Figure 3 Schematic diagram of the sound field in a solitary wave environment during the study period in an embodiment of the present invention.

[0017] Figure 4 : It is the sound propagation loss of receiving on the jump layer of different numbers of internal solitary wave environments during the study period in the embodiment of the present invention.

[0018] Figure 5 : is the receiving sound propagation loss under the jump layer in different numbers of internal solitary wave environments during the study period in the embodiment of the present invention.

[0019] Figure 6 It is the acoustic propagation loss of the receiving layer in the solitary wave environment with different amplitudes during the study period in the embodiment of the present invention.

[0020] Figure 7 It is the receiving sound propagation loss under the jump layer in the solitary wave environment with different amplitudes during the study period in the embodiment of the present invention.

[0021] Figure 8 It is a stacked bar chart of the percentage of the acoustic propagation loss ratio in the solitary wave environment with different polarities during the study period in the embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention provides a method for constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean. The present invention aims to change the characteristic parameters of internal solitary waves through simulation experiments to study the characteristics of underwater sound propagation loss in different internal solitary wave environments. In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, the method for constructing the characteristics of the underwater sound propagation loss affected by the solitary wave in the ocean in this embodiment includes the following steps: Acquire the acoustic environment parameters of the specified simulated ocean area to construct the ocean acoustic environment; Construct various internal solitary wave structures according to the characteristic parameters of internal solitary waves; Combining the ocean acoustic environment and internal solitary wave structure, a variety of internal isolated environment models are constructed; Set up sound sources and receivers, and use the Kraken model to calculate the sound field based on the internal isolated environment model and the set sound sources and receivers to obtain the sound propagation losses of various internal isolated environment models; The sound propagation losses of various internal isolated environment models are compared and analyzed to obtain the influence of internal solitary waves on the characteristics of sound propagation loss.

[0024] The method for constructing the characteristics of the underwater sound propagation loss affected by the internal solitary wave in the ocean in this embodiment mainly includes four steps, namely, construction of the internal solitary wave environment (obtaining the acoustic environment parameters of the specified simulated ocean area to construct the ocean acoustic environment; constructing a variety of internal solitary wave structures according to the characteristic parameters of the internal solitary wave; combining the ocean acoustic environment and the internal solitary wave structure to obtain a variety of internal isolated environment models;), calculating the sound field (setting the sound source and the receiver, and using the kraken model to calculate the sound field based on the internal isolated environment model and the set sound source and receiver to obtain the sound propagation loss of various internal isolated environment models), and characteristic analysis (comparative analysis of the sound propagation losses of various internal isolated environment models to obtain the influence of the internal solitary wave on the sound propagation loss characteristics).

[0025] In order to obtain the ocean acoustic environment in the studied area, it is necessary to input the ocean acoustic environment using the seawater sound velocity, seabed sound velocity, seabed density and seabed absorption coefficient. In this embodiment, the acoustic environment parameters of the specified simulated ocean area include the seawater sound velocity, seabed sound velocity, seabed density and seabed absorption coefficient of the specified simulated ocean area. Among them, the seawater sound velocity, seabed sound velocity, seabed density and seabed absorption coefficient can be set according to the acoustic environment parameters set by the acoustic simulation experiment completed in the relevant sea area. In this embodiment, the acoustic environment of the SWARM (Shallow Water Acoustic Random Medium) experiment (see the literature: Duda, TF; Preisig, JC A modeling study of acoustic propagation throughmoving shallow-water solitary wave packets. IEEE Ocean Eng. 1999, 24, 16-32) is selected as a reference.

[0026] In this embodiment, the seabed sound speed includes the sound speed above the jump layer, the sound speed above the jump layer, and the sound speed below the jump layer.

[0027] In this embodiment, constructing multiple internal solitary wave structures according to the internal solitary wave characteristic parameters includes: firstly determining the type of internal solitary wave structure according to the number of internal solitary waves, the amplitude of the internal solitary wave and the polarity of the internal solitary wave, wherein the number of internal solitary waves corresponds to two types of internal solitary wave structures, i.e., solitons and wave trains; the amplitude of the internal solitary wave corresponds to two types of internal solitary wave structures, i.e., large-amplitude internal solitary waves and small-amplitude internal solitary waves; and the polarity of the internal solitary wave corresponds to two types of internal solitary wave structures, i.e., concave-type internal solitary waves and convex-type internal solitary waves; and then constructing multiple internal solitary wave structures according to the type of internal solitary wave structure in combination with the KdV equation shown in the following formula: , In the above formula, is the internal solitary wave amplitude, is the initial internal solitary wave amplitude, is the hyperbolic secant function, is the moving speed of the internal solitary wave, is the initial time, is the current time, is the characteristic width of the internal solitary wave. It should be noted that the three internal solitary wave characteristic parameters of the number of internal solitary waves, the internal solitary wave amplitude and the internal solitary wave polarity can be combined as needed to obtain up to eight types of internal solitary wave structures, such as the soliton, large amplitude and concave internal solitary wave structures constructed in this embodiment. Figure 2 shown.

[0028] In this embodiment, the ocean acoustic environment and the internal solitary wave structure are combined to construct a plurality of internal isolated environment models, including: an internal isolated environment model in which the internal solitary wave structure is input into the ocean acoustic environment so that the internal solitary wave structure causes disturbance to the seawater sound velocity distribution in the vertical direction, and the function expression of the sound velocity field distribution in the internal isolated environment model is: , , In the above formula, is the sound velocity field distribution function, is the radius, For depth, is the seawater velocity above the jump layer, is the velocity of seawater below the thermocline, is the depth of the upper seawater, is the depth of the lower seawater, is the transition layer thickness, is the seawater sound velocity gradient in the thermocline, It is the depth boundary of the bottom water body.

[0029] In this embodiment, a sound source and a receiver are set, and the kraken model is used to calculate the sound field based on the internal isolated environment model and the set sound source and receiver to obtain the sound propagation loss of various internal isolated environment models, including: setting the sound source frequency, sound source position and sound source depth of the sound source, and setting the receiver position and receiver depth of the receiver; wherein the sound source conditions and the receiver conditions can be specified according to actual needs. For example, in this embodiment, the sound source frequency is specifically set to 600Hz, the sound source is at a water depth of 50m, the receiver is at a water depth of 12m (water layer above the thermocline) and 40m (water layer below the thermocline), and the distance between the sound source and the receiver is 33km; based on the internal isolated environment model and the sound source and receiver, the kraken model is used to calculate the sound field. In this embodiment, based on Figure 2 The soliton, large amplitude, concave internal solitary wave structure shown in the figure sets the accuracy of sound pressure to 1m in the depth direction and 10m in the distance direction. The distance from the sound source to the receiver is 2.4km. The sound field is as follows: Figure 3 As shown; the sound pressure calculated from the sound field is converted into sound propagation loss according to the following formula: , In the above formula, is the sound transmission loss, is the sound pressure, is the radius, For depth.

[0030] In this embodiment, the comparative analysis of the sound propagation losses of various internal isolated environment models to obtain the influence of internal solitary waves on the characteristics of sound propagation loss includes: (1) for the internal isolated environment models corresponding to the two types of internal solitary wave structures corresponding to the number of internal solitary waves, namely solitons and wave trains, the sound propagation losses corresponding to different distances above and below the jump layer are obtained respectively, and curves of sound propagation losses corresponding to different distances are constructed to evaluate the influence of internal solitary waves on the characteristics of sound propagation loss; in this embodiment, the sound propagation losses in the soliton and wave train environments are calculated respectively, and the sound propagation loss characteristics in the soliton and wave train environments when the sound source receiving depth is 12m (above the jump layer) and the sound propagation loss characteristics in the soliton and wave train environments when the sound source receiving depth is 40m (below the jump layer) are compared and analyzed. Figure 4 and Figure 5 The comparison diagrams of acoustic propagation loss above and below the jump layer in soliton and wave train environments are given respectively. Figure 4 and Figure 5 The comparison of the results shows that: as the number of internal solitary waves increases, the sound propagation loss decreases by 3dB and 5-25dB above and below the jump layer, respectively. (2) For the internal solitary environment model corresponding to the two types of internal solitary wave structures, large-amplitude internal solitary waves and small-amplitude internal solitary waves corresponding to the internal solitary wave amplitude, the sound propagation loss corresponding to different distances above and below the jump layer is obtained respectively, and the sound propagation loss curves corresponding to different distances are constructed to evaluate the influence of internal solitary waves on the sound propagation loss characteristics; in this embodiment, the sound propagation loss in the small-amplitude internal solitary wave and large-amplitude internal solitary wave environments are calculated respectively, and the sound propagation loss characteristics in the small-amplitude internal solitary wave and large-amplitude internal solitary wave environments when the sound source receiving depth is 12m (above the jump layer) and the sound propagation loss characteristics in the small-amplitude internal solitary wave and large-amplitude internal solitary wave environments when the sound source receiving depth is 40m (below the jump layer) are compared and analyzed. Figure 6 and Figure 7 The comparison diagrams of acoustic propagation loss above and below the jump layer in small-amplitude internal solitary wave and large-amplitude internal solitary wave environments are given respectively. Figure 6 and Figure 7The comparison of the results shows that: under the sound source conditions of this embodiment, the sound propagation loss above the jump layer decreases by 10dB as the internal solitary wave amplitude increases, and the sound propagation loss below the jump layer increases by 14dB as the internal solitary wave amplitude increases, indicating that the increase in the internal solitary wave amplitude is beneficial to the average of the sound energy in the vertical direction. (3) For the internal solitary wave polarity corresponding to the two types of internal solitary wave structures, namely the concave internal solitary wave and the convex internal solitary wave, the sound propagation losses corresponding to different distances above and below the jump layer are obtained respectively, and the sound propagation loss curves corresponding to different distances are constructed to evaluate the influence of the internal solitary wave on the sound propagation loss characteristics. In this embodiment, the sound propagation losses in the concave internal solitary wave and convex internal solitary wave environments are calculated respectively, and the sound propagation loss characteristics in the concave internal solitary wave and convex internal solitary wave environments when the sound source receiving depth is 12m (above the jump layer) and the sound propagation loss characteristics in the concave internal solitary wave and convex internal solitary wave environments when the sound source receiving depth is 40m (below the jump layer) are compared and analyzed. Figure 8 A stacked bar chart of the percentage of sound propagation loss above and below the jump layer in the concave internal solitary wave and convex internal solitary wave environments under the sound source conditions of this embodiment is given. Figure 8 The statistical results of the stacked bar chart of the percentage of sound propagation loss show that: relative to the distribution of propagation loss above the jump layer, the distribution of sound propagation loss below the jump layer becomes narrower; when receiving below the jump layer: the sound propagation loss in the convex internal solitary wave environment is concentrated at 65dB, while the sound propagation loss in the concave internal solitary wave environment is concentrated at 85dB. This shows that when the polarity of the internal solitary wave changes from concave to convex, the sound propagation loss is significantly reduced below the jump layer. It can be seen that the method of constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean in this embodiment can construct a universal underwater sound propagation loss characteristic under the influence of internal solitary waves, and can improve the accuracy of the data of the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean based on the influence of the characteristic parameters of the internal solitary waves on the sound propagation loss, thereby providing a reference for the effect of internal solitary waves on sound propagation, and providing theoretical support for studying the characteristics of sound propagation loss under different characteristic internal solitary wave environments.

[0031] In addition, this embodiment also provides a system for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean, including a microprocessor and a memory connected to each other, and the microprocessor is programmed or configured to execute the method of constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean.

[0032] In addition, this embodiment also provides a computer-readable storage medium, which stores a computer program or instruction, and the computer program or instruction is programmed or configured to execute the method of constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean through a processor.

[0033] In addition, this embodiment also provides a computer program product, including a computer program or instructions, which are programmed or configured to execute the method of constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean through a processor.

[0034] Those skilled in the art should understand that the technical solutions provided by the embodiments of the present invention may be in the form of methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that instructions executed by the processor of a computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0035] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean, characterized in that: The steps include: Acquire the acoustic environment parameters of the specified simulated ocean area to construct the ocean acoustic environment; Construct various internal solitary wave structures according to the characteristic parameters of internal solitary waves; Combining the ocean acoustic environment and internal solitary wave structure, a variety of internal isolated environment models are constructed; Set up sound sources and receivers, and use the Kraken model to calculate the sound field based on the internal isolated environment model and the set sound sources and receivers to obtain the sound propagation losses of various internal isolated environment models; Comparative analysis of the sound propagation losses of various internally isolated environment models reveals the influence of internally isolated waves on the characteristics of sound propagation losses. The method of constructing a plurality of internal solitary wave structures according to the characteristic parameters of the internal solitary wave comprises: firstly determining the type of the internal solitary wave structure according to the number of internal solitary waves, the amplitude of the internal solitary wave and the polarity of the internal solitary wave, wherein the number of internal solitary waves corresponds to two types of internal solitary wave structures, namely, solitons and wave trains; the amplitude of the internal solitary wave corresponds to two types of internal solitary wave structures, namely, large-amplitude internal solitary waves and small-amplitude internal solitary waves; and the polarity of the internal solitary wave corresponds to two types of internal solitary wave structures, namely, concave-type internal solitary waves and convex-type internal solitary waves; and then constructing a plurality of internal solitary wave structures according to the type of the internal solitary wave structure in combination with the KdV equation shown in the following formula: ， In the above formula, is the internal solitary wave amplitude, is the initial internal solitary wave amplitude, is the hyperbolic secant function, is the moving speed of the internal solitary wave, is the initial time, is the current time, is the characteristic width of the internal solitary wave.

2. The method for constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean according to claim 1, characterized in that: The acoustic environment parameters of the designated simulated ocean area include the seawater sound velocity, seabed sound velocity, seabed density and seabed absorption coefficient of the designated simulated ocean area.

3. The method for constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean according to claim 2, characterized in that: The seabed sound speed includes the above-cline sound speed, the below-cline sound speed and the below-cline sound speed.

4. The method for constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean according to claim 1, characterized in that: The method of combining the ocean acoustic environment and the internal solitary wave structure to construct a plurality of internal isolated environment models includes: inputting the internal solitary wave structure into the ocean acoustic environment so that the internal solitary wave structure causes disturbance to the sound velocity distribution of seawater in the vertical direction, and the function expression of the sound velocity field distribution in the internal isolated environment model is: ， ， In the above formula, is the sound velocity field distribution function, is the radius, For depth, is the seawater velocity above the jump layer, is the velocity of seawater below the thermocline, is the depth of the upper seawater, is the depth of the lower seawater, is the transition layer thickness, is the seawater sound velocity gradient in the thermocline, It is the depth boundary of the bottom water body.

5. The method for constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean according to claim 4, characterized in that: The method of setting a sound source and a receiver, and using a kraken model to calculate the sound field based on the internal isolated environment model and the set sound source and receiver to obtain the sound propagation loss of various internal isolated environment models includes: setting the sound source frequency, the sound source position and the sound source depth of the sound source, and setting the receiver position and the receiver depth of the receiver; using a kraken model to calculate the sound field based on the internal isolated environment model and the set sound source and receiver; and converting the sound pressure obtained by the sound field calculation into the sound propagation loss according to the following formula: ， In the above formula, is the sound transmission loss, is the sound pressure, is the radius, For depth.

6. The method for constructing the characteristics of underwater sound propagation loss affected by internal solitary waves in the ocean according to claim 1, characterized in that: The comparative analysis of the sound propagation losses of various internal isolated environment models to obtain the influence of the internal solitary wave on the sound propagation loss characteristics includes: for the internal isolated environment models corresponding to the two types of internal solitary wave structures, i.e., solitons and wave trains, the sound propagation losses corresponding to different distances above and below the jump layer are obtained respectively, and curves of the sound propagation losses corresponding to different distances are constructed to evaluate the influence of the internal solitary wave on the sound propagation loss characteristics; for the internal isolated environment models corresponding to the two types of internal solitary wave structures, i.e., large-amplitude internal solitary waves and small-amplitude internal solitary waves, the sound propagation losses corresponding to different distances above and below the jump layer are obtained respectively, and curves of the sound propagation losses corresponding to different distances are constructed to evaluate the influence of the internal solitary wave on the sound propagation loss characteristics; for the internal isolated environment models corresponding to the two types of internal solitary wave structures, i.e., concave internal solitary waves and convex internal solitary waves, the sound propagation losses corresponding to different distances above and below the jump layer are obtained respectively, and curves of the sound propagation losses corresponding to different distances are constructed to evaluate the influence of the internal solitary wave on the sound propagation loss characteristics.

7. A system for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean, comprising a microprocessor and a memory connected to each other, characterized in that: The microprocessor is programmed or configured to execute the method for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean as described in any one of claims 1 to 6.

8. A computer-readable storage medium having a computer program or instruction stored therein, characterized in that: The computer program or instruction is programmed or configured to execute the method for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean as described in any one of claims 1 to 6 through a processor.

9. A computer program product comprising a computer program or instructions, characterized in that The computer program or instruction is programmed or configured to execute the method for constructing the characteristics of underwater sound propagation loss affected by solitary waves in the ocean as described in any one of claims 1 to 6 through a processor.

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