KR101272854B1 - Tsunami database establishment and tsumani computation methods by unit tsunami - Google Patents

Abstract

PURPOSE: A tsunami database establishment and tsunami computation method by unit tsunami is provided to rapidly predict the scale of tsunami in case of earthquakes without establishing large amount of database. CONSTITUTION: A method for predicting the height of tsunami includes the following steps: computing the heights of tsunami respectively in a plurality of areas with predetermined unit areas; computing wave heights of respective earthquake occurred areas; computing a ratio between the wave heights of the respective earthquake occurred areas and a predetermined wave height; and computing the height of tsunami at a predetermined area based on the computed ratio. A database unit(101) is for storing data of the plurality of areas.

Description

Tsunami database construction and tsunami calculation method by unit tsunami {TSUNAMI DATABASE ESTABLISHMENT AND TSUMANI COMPUTATION METHODS BY UNIT TSUNAMI}

The present invention relates to a tsunami database construction and a tsunami calculation method using unit tsunamis, and more specifically, to construct a tsunami database for a unit tsunami and calculate tsunamis in a specific region by using the tsunami database.

Globally, an average of 500,000 earthquakes are happening about 500,000 times a year, and about 100,000 earthquakes can be felt by humans. Most earthquakes are caused by the movement of the earth's crust, which is explained by plate tectonics, when the stress accumulated over time is unbalanced, causing the crust to bounce or deviate from one another. More than 90% of the earthquakes that occur throughout the earth occur in the Pacific Rim midwifery called the Ring of fire.

In Japan, which is part of the Pacific Rim midwifery, earthquakes often occur and the occurrence of unusual earthquakes is high because they are located at the junction of four crustal masses (Eurasian, Philippine, Pacific, and North American plates).

Japan is a country with tremendous heat and pressure energy underground due to its geological location.

Tsunamis are gravitational waves generated by rising or settling of the ocean floor when an earthquake, volcanic eruption, fault movement, or nuclear test occurs on the ocean floor. As mentioned above, tsunami is also called tsunami in Japan, where earthquakes frequently occurred and the tsunami was severely damaged. Waves in the ocean vary from less than one second to more than 24 hours, but tsunamis are waves that are one to two hours long. Tsunami propagation speed is proportional to depth.

The tsunami caused by the earthquake off Japan's Honshu Akida Prefecture on May 26, 1983, and the earthquake off the coast of Hokkaido on July 12, 1993, caused severe damage on Korea's east coast. If an earthquake occurs in the northeastern sea of the East Sea (offshore northwest of Japan), the resulting tsunami will reach the east coast after an hour to an hour and a half, so an appropriate warning can give you about 30 minutes to an hour.

To predict the tsunamis up to now, numerical simulations of the magnitude of the subsea earthquake are carried out only on a certain range or a certain scale (for example, 7.0 to 8.0, 0.4 interval, etc.), and the results are databased. In the case of a subsea earthquake, the tsunami tsunami is predicted using the database data of the most similar size.

According to this method, when an earthquake of magnitude not currently stored in the database occurs, the magnitude of the tsunami is estimated by using calculation methods such as interpolation. When the earthquake occurs in the northeastern area of the East Sea, the tsunami on the east coast There was a problem that it takes longer than 1 hour to 1 hour 30 minutes to reach this time.

In order to solve this problem, it is necessary to establish a database for earthquakes of various scales, and there are problems such as large database.

The present invention is to solve the above problems, it is an object of the present invention to provide a method that can quickly and quickly predict the magnitude of the tsunami when an earthquake occurs without building a large database.

In order to achieve the above object, according to an embodiment of the present invention, a method for predicting the height of the tsunami of the predetermined area is disclosed. The method comprises the steps of: calculating a height of the tsunami generated in the predetermined area when a predetermined crest occurs in each of the plurality of areas having a predetermined unit area; Calculating a crest height for each of the areas where the earthquake occurs when an earthquake occurs in at least one of the plurality of areas; Calculating a ratio between each crest occurring in the regions where the earthquake occurred and the predetermined crest; And a tsunami of the predetermined region by adding a height of the tsunami generated in the predetermined region by a wave height generated in each of the regions in which the earthquake occurred based on a ratio calculated for each of the regions in which the earthquake occurred. Computing the height of may include.

In addition, the predetermined unit area is a region corresponding to 0.1 degrees longitude and 0.1 degrees latitude, the predetermined wave height is 1m, and calculates the ratio between each wave height generated in the earthquake-producing areas and the predetermined wave height The step may further include designating the ratio as 0 when the ratio between the wave height generated in the earthquake occurrence area and the predetermined wave height is 0.1 or less.

According to another embodiment of the present invention, a computer readable electronic recording medium including a computer program for predicting the height of a tsunami in a predetermined area is disclosed. The computer readable electronic recording medium is a computer program for causing at least one computer to respectively calculate the height of a tsunami generated in the predetermined area when a predetermined crest occurs in each of a plurality of areas having a predetermined unit area. code; Computer program code for causing at least one computer to calculate crest height for each of the regions where the earthquake occurred when an earthquake occurs in one or more of the plurality of regions; Computer program code for causing at least one computer to calculate a ratio between each crest occurring in the regions where the earthquake occurred and the predetermined crest; And causing the at least one computer to add the heights of the tsunamis generated in the predetermined area by the crest generated in each of the earthquake-occurring areas based on a ratio calculated for each of the earthquake-prone areas. Computer program code may be included to calculate the height of the tsunami in a predetermined region.

In addition, the predetermined unit area is an area corresponding to 0.1 degrees longitude and 0.1 degrees latitude, the predetermined wave height is 1m, and causes each of the wave heights generated in the earthquake areas and the predetermined The computer program code for causing the ratio between the crests to be calculated is a computer program for causing at least one computer to specify the ratio as zero if the ratio between the crests occurring in the region where the earthquake occurred and the predetermined crest is less than or equal to 0.1. It may further include code.

According to such a configuration, it is possible to warn by predicting the height of the tsunami within a short time for the area where the tsunami damage is expected.

1 shows a schematic diagram of a system for predicting the height of a tsunami in a predetermined area according to one embodiment of the invention.
2 is a view illustrating a state in which the waters of the Republic of Korea are chopped to a unit area according to an embodiment of the present invention.
3 is a graph showing the wave height according to the earthquake occurred in each unit area according to an embodiment of the present invention.
4 shows a flowchart of a method for predicting the height of a tsunami in a predetermined area in accordance with an embodiment of the present invention.
5-7 illustrate a process for calculating the expected height of a tsunami of a predetermined area in accordance with one embodiment of the present invention.

Various embodiments are now described with reference to the drawings. In the following description, for purposes of explanation, various explanations are presented through embodiments. It is evident, however, that such embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing embodiments.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

The terms "component," "module," "system," and the like as used herein refer to a computer-related entity, hardware, firmware, software, combination of software and hardware, or execution of software. For example, a component may be, but is not limited to, a process executing on a processor, a processor, an object, an executing thread, a program, and / or a computer. For example, both an application running on a computing device and a computing device may be a component. One or more components may reside within a processor and / or thread of execution, one component may be localized within one computer, or it may be distributed between two or more computers. Further, such components may execute from various computer readable media having various data structures stored therein. The components may be, for example, a signal (e.g., a local system, data from one component interacting with another component in a distributed system, and / or data over a network, such as the Internet, Lt; RTI ID = 0.0 > and / or < / RTI >

In addition, the various aspects or features presented herein may be embodied in a method, apparatus, or article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" includes a computer program, carrier, or media accessible from any computer-readable device. For example, computer readable media may include magnetic storage devices (eg, hard disks, floppy disks, magnetic strips, etc.), optical disks (eg, CDs, DVDs, etc.), smart cards, and flash memory devices. (Eg, EEPROM, card, stick, key drive, etc.), but is not limited to these. In addition, various storage media presented herein include one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" includes, but is not limited to, wireless channels and various other media capable of storing, holding, and / or transferring instruction (s) and / or data.

1 shows a schematic diagram of a system for predicting the height of a tsunami in a predetermined area according to one embodiment of the invention.

Referring to FIG. 1, the system may include a database unit 101, a wave height calculation unit 102, a ratio calculation unit 103, and a tsunami height calculation unit 104.

The database unit 101 calculates the height of the tsunami generated in the predetermined area when a predetermined crest occurs in each of the plurality of areas having a predetermined unit area.

The area where the tsunami height needs to be mainly calculated is the coastal area of Korea, including the east coast area that can be damaged by the tsunami caused by the Japanese coastal earthquake as described above.

For example, it is very important to predict the height of the tsunami in a particular area of the east coast when a tsunami occurs in the epicenter because it is determined that the area of the east coast is mainly affected by the tsunami.

The database unit 101 generates an earthquake in each of the unit areas for each of the unit areas 202a, 202b, 202c, ..., 202n shown in FIG. You can calculate the height of the tsunami in a predetermined area where you want to predict the height of the tsunami and build it into a database.

For example, when a portion indicated by 201 in FIG. 2 is a place affected by a tsunami caused by an earthquake, a specific height, for example, in each unit area 202a, 202b, 202c, ..., 202n is used. For example, when a 1m tsunami occurs, how many crests are generated in the area 201 due to the tsunami generated in the unit areas 202a, 202b, 202c, ..., 202n. Through experimentation, you can build a database.

For example, when a 1 m tsunami occurs in the unit area 202a, a crest occurring in the area 201 is 30 cm, and a crest occurring in the area 201 when a 1 m tsunami occurs in the unit area 202b occurs. When a tsunami of 1 cm occurs at 20 cm and unit area 202c, the crest generated in the area 201 is 15 cm, and so on, a database is constructed for each unit area 202a, 202b, 202c, ..., 202n. Can be set.

Here, the unit area may mean an area corresponding to 0.1 degree longitude and 0.1 degree latitude.

When the earthquake occurs in one or more of the unit areas 202a, 202b, 202c,..., 202n, the crest calculator 102 may calculate a crest height for each of the areas where the earthquake occurs.

For example, when an earthquake occurs in areas 202a, 202b, and 202c of the unit areas, a tsunami may be calculated for each of the areas 202a, 202b, and 202c.

For example, the wave height of the area 202a can be calculated as 2m, the wave height of the area 202b is 2.5m, and the wave height of the area 202c is 1.8m.

As described above, a method of calculating the tsunami of the tsunami when the earthquake occurs in the epicenter is variously known in the art, and the calculation time is very short. Detailed description of this calculation method is omitted.

The ratio calculator 103 may calculate a ratio between each wave height generated in the earthquake-prone regions and the predetermined wave height.

For example, since the reference wave height is 1m for the area 202a and the tsunami wave height is 2m, the ratio can be calculated as 2, and for the area 202b, the reference wave height is 1m and the tsunami wave is generated. Since the ratio is 2.5m, the ratio can be calculated as 2.5, and the ratio can be calculated as 1.8 because the reference wave height is 1m for the area 202c and the tsunami wave generated is 1.8m.

Here, when the ratio is 0.1 or less, for example, when the reference wave height is 1m, the ratio may be calculated as 0 for the area where the tsunami height of the areas is 0.1m or less. This is because the tsunami wave height generated in the region to predict the tsunami is hardly affected by the tsunami generated in the unit area whose ratio is 0.1 or less.

The tsunami height calculation unit 104 may calculate the crest height of the desired area 201 based on the ratio calculated by the ratio calculation unit 103.

The tsunami height calculation unit 104 multiplies the crest data constructed by the database unit 101 by the ratio calculated by the ratio calculation unit 103 in the region 201 predetermined by the tsunami generated in each unit area. The heights of the tsunamis of the generated tsunamis can be obtained, respectively, and linearly added to predict the resulting heights of the tsunamis.

For example, the ratio calculated for the unit area 202a is 2, the crest occurring in the area 201 for a reference wave height (e.g., 1 m) is 30 cm multiplied by 60 cm, and the unit area 202b. ) And the calculated crest for area 201 with respect to the reference crest is 20 cm multiplied by 50 cm, the calculated ratio for the unit area 202c is 1.8 and the crest for the reference crest is 1.8 The crest occurring at 201) is 15 cm multiplied by 27 cm.

As a result, the value 137 cm plus the above three values (60 + 50 + 27) may be a wave tsunami predicted to occur in the predetermined region 201.

The reason why the height of the resulting tsunami can be calculated as a linear sum as described above is explained below.

In general, in calculating tsunamis, fault planes consist of one or several squares, depending on their shape.

For example, for a tsunami with two faults, if the numerical model is linear, the tsunami formed by each fault can be calculated independently and the original solutions can be obtained by adding the two solutions together.

The same result can be obtained by discretizing the tsunami initial waveform into a unit grid in the same way, then extracting the components and calculating them independently.

If the epicenter of the tsunami discretizes the fault zone into a unit grid and reproduces the initial conditions of the tsunami on the grid, a solution of the height of the unit height is given to the grid included in the fault zone. have.

Each solution can be summed by multiplying the calculated height by the initial height of the tsunami assigned to the fault zone to obtain the desired tsunami solution.

3 is a graph showing the wave height according to the earthquake occurred in each unit area according to an embodiment of the present invention.

Referring to FIG. 3, an earthquake occurs between 139 degrees to 139.4 degrees longitude and 39.9 degrees to 40.9 degrees longitude, resulting in a tsunami. have. This ratio can be used to calculate tsunami surges in predetermined areas.

4 shows a flowchart of a method for predicting the height of a tsunami in a predetermined area in accordance with an embodiment of the present invention.

Referring to FIG. 4, first, when a predetermined crest occurs in each of a plurality of regions having a predetermined unit area, a height of a tsunami generated in a predetermined region may be calculated (401).

Then, when an earthquake occurs in one or more of the plurality of regions, a crest may be calculated for each of the regions where the earthquake occurred (402).

Then, a ratio between each crest occurring in the regions where the earthquake occurred and a predetermined crest may be calculated (403). Here, the predetermined unit area may be an area corresponding to 0.1 degree longitude and 0.1 degree latitude. In addition, the predetermined crest may be 1 m. In addition, when the ratio between the crest occurring in the region where the earthquake occurs and the predetermined crest is 0.1 or less, the ratio may be designated as zero.

Finally, the height of the tsunamis in the predetermined area is added by adding the heights of the tsunamis generated in the predetermined area by the wave height generated in each of the earthquake areas based on the ratio calculated for each of the earthquake areas. May be calculated (404).

Referring to the tsunami calculation process according to an embodiment of the present invention proceeds as follows.

Indexing is performed by configuring the calculation grid of the numerical simulation program according to the size of the unit earthquake. The initial waveform of the tsunami is calculated according to the magnitude of the earthquake, and the experimental plan of the unit earthquake corresponding to the initial waveform is analyzed by analyzing the calculated initial waveform. If the sea level of the initial waveform is less than 10 cm and if it corresponds to land, it is not considered to be affected. To run the tsunami simulation program, a stable Linux-based server is built. The experiment plan calculated from the initial waveform analysis is divided by server.

Based on the data constructed through the preprocessing process, the script is configured to automatically execute the unit earthquake according to the experiment.

For each experiment of the unit earthquake, the initial wave height is calculated as 1m, and the calculation grid of unit earthquake tsunami is composed of 0.1 ^o × 0.1 ^o to generate input data that can be input to the numerical simulation program.

After each experiment for the unit earthquake, the time series values for the newly selected coast monitoring point are extracted and saved to a file. Due to the large amount of program results, the result files are deleted as soon as time series values are extracted.

Once the calculation for the unit earthquake is complete, the time series files extracted for the monitoring points are collected in one place. Collected data are merged according to scenario and size through pre-searched unit earthquake index. Based on the merged time series data, the arrival time and the maximum wave height of the initial wave are estimated for the coastal monitoring point and the result file is derived.

5-7 illustrate a process for calculating the expected height of a tsunami of a predetermined area in accordance with one embodiment of the present invention.

Referring to FIG. 5, the tsunami occurrence points are displayed in color like contour lines according to the ratio. Among them, the area indicated in red square on the northeastern coast of Japan has a ratio of 0.1 or more, which is a significant area that affects the predetermined area.

Referring to FIG. 6, an indexing operation is performed on the square region.

For indexed parts, crest is calculated by the following equation.

In the above equation, D (t) represents the crest over time, d ^t _n is the crest over time calculated for the unit tsunami, and η _n represents the crest ratio of the initial waveform.

The table above shows the result of multiplying the crest and ratio over time for each earthquake index over time.

The final value D (t) is a value obtained by calculating all the influences on each of the indices for each time, and thus means a crest value in a predetermined region over time.

Referring to FIG. 7 as a graph of this, the crest value for the tsunami in the Mukho area is displayed as a graph over time.

Those skilled in the art will appreciate that the various illustrative logical blocks, modules, processors, means, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be embodied directly in electronic hardware, (Which may be referred to herein as "software") or a combination of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the design constraints imposed on the particular application and the overall system. Those skilled in the art may implement the described functionality in various ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The various illustrative logical blocks, modules, and circuits described in connection with the embodiments disclosed herein are general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), designed to perform the functions described herein, It may be implemented or performed through a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general purpose processor may be a microprocessor, or, in the alternative, the general purpose processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

It will be appreciated that the particular order or hierarchy of steps in the presented processes is an example of exemplary approaches. It will be appreciated that, based on design priorities, certain orders or hierarchies of steps in processes may be rearranged within the scope of the present invention. The appended method claims provide elements of the various steps in a sample order, but are not meant to be limited to the specific order or hierarchy presented.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules and other data (e.g., including executable instructions and related data) may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, Or any other form of storage medium as is known in the art. An exemplary storage medium may be coupled to a machine, such as a computer or processor (which may be referred to as a "processor" for convenience), such that the processor reads information (e.g., software instructions) And record information on a storage medium. An exemplary storage medium may be integral to the processor. The processor and the storage medium may be included within an ASIC. The ASIC may be included within the user device. In the alternative, the processor and the storage medium may reside as discrete components in a user device.

In one or more exemplary designs, the techniques described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored in a computer-readable medium, or transmitted as one or more instructions via a computer-readable medium, or may be coded in a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates the transfer of computer programs from one place to another. The storage medium may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can be RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic field disk storage or other magnetic storage devices, or general purpose or special purpose computers, Or any other medium which can be accessed by the destination processor and used to carry or store the program code means required in the form of instructions or data structures. Also, all connections are terminated with a suitably computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using wireless technologies such as coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or infrared, wireless and microwave , Coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave are included in the definition of the medium. As used herein, a disk and a disc include a compact disk (CD), a laser disk, an optical disk, a DVD, a floppy disk, and a Blu-ray disk, While disks usually reproduce the data magnetically. Combinations of the above are also encompassed within the scope of computer-readable media.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

Claims (4)

As a method for estimating the height of the tsunami in a predetermined area,
Calculating a height of the tsunami generated in the predetermined area when a predetermined crest occurs in each of the plurality of areas having a predetermined unit area;
Calculating a crest height for each of the areas where the earthquake occurs when an earthquake occurs in at least one of the plurality of areas;
Calculating a ratio between each crest occurring in the regions where the earthquake occurred and the predetermined crest; And
By adding the height of the tsunami generated in the predetermined area by the wave height generated in each of the earthquake occurred region based on the ratio calculated for each of the earthquake occurred region, the tsunami of the predetermined area Step to calculate height
A method for predicting the height of the tsunami of the predetermined area, comprising. The method of claim 1,
The predetermined unit area is an area corresponding to 0.1 degrees longitude and 0.1 degrees latitude,
The predetermined crest is 1 m,
Calculating a ratio between each crest occurring in the earthquake-prone areas and the predetermined crest,
And if the ratio between the crest occurring in the earthquake region and the predetermined crest is less than 0.1, designating the ratio as zero. A computer readable electronic recording medium comprising a computer program for predicting the height of a tsunami in a predetermined area,
The computer program,
Computer program code for causing at least one computer to respectively calculate the height of the tsunami generated in the predetermined area when a predetermined crest occurs in each of the plurality of areas having a predetermined unit area;
Computer program code for causing at least one computer to calculate crest height for each of the regions where the earthquake occurred when an earthquake occurs in one or more of the plurality of regions;
Computer program code for causing at least one computer to calculate a ratio between each crest occurring in the regions where the earthquake occurred and the predetermined crest; And
Wherein the at least one computer adds the heights of the tsunamis generated in the predetermined area by the crest generated in each of the earthquake-occurring areas based on a ratio calculated for each of the earthquake-prone areas. Computer program code to calculate the height of the tsunami in the determined area
And a computer readable electronic recording medium. The method of claim 3, wherein
The predetermined unit area is an area corresponding to 0.1 degrees longitude and 0.1 degrees latitude,
The predetermined crest is 1 m,
Computer program code for causing at least one computer to calculate a ratio between each crest occurring in the regions where the earthquake occurred and the predetermined crest,
And computer program code for causing at least one computer to specify the ratio as zero if the ratio between the wave height occurring in the region where the earthquake occurred and the predetermined wave height is 0.1 or less.

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