WO2006087802A1 - Système de détection de tsunami - Google Patents

Système de détection de tsunami Download PDF

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Publication number
WO2006087802A1
WO2006087802A1 PCT/JP2005/002601 JP2005002601W WO2006087802A1 WO 2006087802 A1 WO2006087802 A1 WO 2006087802A1 JP 2005002601 W JP2005002601 W JP 2005002601W WO 2006087802 A1 WO2006087802 A1 WO 2006087802A1
Authority
WO
WIPO (PCT)
Prior art keywords
tsunami
floating body
detection system
mooring
horizontal
Prior art date
Application number
PCT/JP2005/002601
Other languages
English (en)
Japanese (ja)
Inventor
Yukihiro Terada
Keiji Ito
Takenori Abe
Takashi Fujita
Original Assignee
Hitachi Zosen Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Zosen Corporation filed Critical Hitachi Zosen Corporation
Priority to PCT/JP2005/002601 priority Critical patent/WO2006087802A1/fr
Priority to JP2007503540A priority patent/JP4588065B2/ja
Publication of WO2006087802A1 publication Critical patent/WO2006087802A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/14—Receivers specially adapted for specific applications
    • G01S19/17—Emergency applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30—Assessment of water resources

Definitions

  • the present invention relates to a tsunami detection system capable of measuring a tsunami using radio waves of a plurality of satellite forces.
  • GPS Global Positioning System
  • Non-Patent Document 1 “Development of GPS Tsunami Meter” (Monthly “Ocean” extra N0.15 1998) (hereinafter referred to as Non-Patent Document 1).
  • Non-Patent Document 2 The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS) etc.) (hereinafter referred to as Non-Patent Document 2).
  • Non-Patent Document 3 “Development of GPS Tsunami Meter-Practical Experiment on Offshore Ofunato” (The IEICE Transactions Vol.J84-B NO.12 December pp2227-2235) (December 2001) (hereinafter, Non-Patent Document 3 Called).
  • Patent Document 1 JP-A-11-63984 (hereinafter referred to as Patent Document 1).
  • Patent Document 2 JP 2001-147263 A (hereinafter referred to as Patent Document 2).
  • Patent Document 3 JP 2001-281323 A (hereinafter referred to as Patent Document 3).
  • Non-Patent Document 1, Non-Patent Document 3, and Patent Document 1 relate to a tsunami detection system using a real-time kinematic method (hereinafter referred to as RTK method).
  • Reference 2 and Patent Document 3 relate to the principle of obtaining positioning accuracy equivalent to that of the RTK method by a method different from the RTK method.
  • the base station which is also a reference station
  • a measurement floating body includes an anchor submerged on the seabed in a predetermined sea area.
  • the floating body is connected to the anchor via a chain or other rope and a weight is attached, and a measuring device is provided on the floating body.
  • the base station and the measurement floating body are equipped with a GPS receiver, and the displacement vector with respect to the base line vector of the floating body is calculated by the RTK method, so that the accurate position of the measurement floating body is obtained in real time. It is made to be required!
  • Non-Patent Document 1 and Non-Patent Document 3 disclose a report based on a measurement result in a state where no tsunami has occurred
  • Patent Document 1 discloses a process for determining displacement data. A configuration is disclosed that is input to the science department to determine whether the displacement is due to a tsunami.
  • Patent Document 4 By the way, in Patent Document 4 described above, only the detection of wave heights including waves is performed. Also in Patent Document 1, displacement data is input to the judgment processing unit and is caused by a tsunami. Although it is only described that it is determined whether it is a failure or not, the present inventors detect tsunamis by removing short-period components such as waves by frequency discrimination and extracting long-period components including tsunami components. Has succeeded.
  • Non-Patent Document 3 experiments have been carried out with a floating body installed in a sea area with a water depth of about 50m. It is small and the sea surface displacement increases as the water depth becomes shallower. If a floating body is installed offshore for early tsunami detection, it is expected that the water depth will become deeper and tsunami detection will be difficult. Therefore, an object of the present invention is to provide a tsunami detection system that does not depend on sea level displacement.
  • a tsunami detection system includes a floating body moored on the sea surface by a mooring device, and a position measuring device that is provided on the floating body and can detect its own position by receiving radio waves from a plurality of satellites.
  • a tsunami detection system comprising a tsunami detection device capable of detecting the presence or absence of a tsunami based on horizontal position data obtained by the position measuring device,
  • a tsunami detection area setting unit that inputs horizontal position data obtained by the position measuring device at predetermined time intervals and sets a tsunami determination area according to the current measurement position of the floating body relative to the mooring center position of the floating body, and this tsunami A tsunami determination unit that determines whether or not there is a tsunami based on whether or not the next measurement position of the floating body is included in the determination region set in the determination region setting unit is provided.
  • the tsunami determination area in the tsunami detection system is a movement limit line indicating a movement limit of a predetermined radius centered on the mooring center position of the floating body, and extends radially from the floating body center.
  • a judgment boundary line obtained by connecting each of the intersection points where the plurality of straight lines and the movement limit line intersect each other and a plurality of line segments connecting the floating body center are respectively divided at a predetermined ratio.
  • the horizontal relative position with respect to the mooring center position of the floating body is obtained by radio waves of satellite power, and the floating body is within the tsunami determination area set according to the horizontal relative position of the floating body. Because the tsunami is detected by determining whether it is present or not, the tsunami is detected even if the depth is deep! It can be detected easily and accurately only by the amount of movement in the horizontal direction.
  • FIG. 1 is a perspective view showing a schematic overall configuration of a tsunami detection system according to an embodiment of the present invention. It is.
  • FIG. 2 is a block diagram showing a schematic configuration of a mobile station in the tsunami detection system.
  • FIG. 3 is a block diagram showing a schematic configuration of a reference station in the tsunami detection system.
  • FIG. 4 is a block diagram showing a schematic configuration of a tsunami detection device provided in the reference station.
  • FIG. 5 is a plan view for explaining a method for setting a tsunami determination area of the tsunami detection device.
  • FIG. 6 is a plan view for explaining a method for setting a tsunami determination area of the tsunami detection device.
  • FIG. 7 is a flowchart for explaining a tsunami detection method in the tsunami detection system.
  • the tsunami detection system floats a floating body on the sea surface, and based on the horizontal movement amount (including distance and direction) of the floating body on the sea surface (two-dimensional horizontal plane), the presence or absence of a tsunami
  • the horizontal movement of the floating body is measured by the real-time kinematic positioning method, which is a relative positioning using GPS (Global Positioning System).
  • this tsunami detection system is fixed on land, has a known three-dimensional absolute position, and receives radio waves from multiple (at least four) GPS satellites 1.
  • Base station 2 to obtain positioning data, and a mooring cord (such as a mooring tool) 3 such as a chain on the sea surface (specifically, the sea area where the tsunami is to be measured) at a predetermined distance from this base station 2.
  • a mooring cord such as a mooring tool
  • the moored floating body 4 and the mobile station 5 which is provided on the floating body 4 side and receives radio waves from a plurality of GPS satellites 1 as in the reference station 2 and obtains positioning data, and both the stations 2 and 5
  • a detection device (see FIG. 3) 6 is provided.
  • the tsunami detection device 6 is described as being provided in the reference station 2.
  • the mobile station 5 includes a mobile-side GPS receiver (position measuring device) 11 that can receive radio waves from a GPS satellite 1 and detect positioning data, and the mobile side. GPS reception A mobile-side radio device (radio transceiver) 12 capable of transmitting the positioning data obtained by the device 11 by radio is provided.
  • the reference station 2 receives a radio wave from the GPS satellite 1 and can detect positioning data, and a reference-side GPS receiver (position measuring device) 21 and the mobile-side radio A reference-side wireless device (radio transceiver) 22 that receives the positioning data transmitted by the device 12 is provided, and the tsunami detection device 6 is arranged as described above.
  • the positioning data obtained by both the GPS receivers 11 and 21 are input directly and directly via the reference-side wireless device 22, and real-time based on the both positioning data.
  • the kinematic positioning method which uses the carrier phase, hereafter referred to as the RTK method
  • at least the horizontal relative position of the mobile station 5 with respect to the reference station 2 that is, on the sea surface of the center of the floating body 4 (in a two-dimensional horizontal plane)
  • the horizontal position is accurately measured, and the presence or absence of a tsunami is detected based on this measurement position.
  • the tsunami detection device 6 includes positioning data obtained at both stations 2 and 5, [for example, carrier phase value, distance between satellite and receiver antenna (pseudo distance) , Satellite orbit information, and positioning system used to include time-series data (GPS time), etc., and calculate the relative position of mobile station 5 with respect to reference station 2 using the RTK method
  • a horizontal position calculation unit 31 for obtaining the current center position of the floating body 4 relative to the mooring center position of the floating body 4 (which is a relative position with respect to the reference station), that is, a horizontal relative position, and a horizontal position obtained by the horizontal position calculation unit 31 Enter the relative position and the tsunami judgment area S defined in the past, determine whether the current center position of the floating body 4 exists (is included) in the tsunami judgment area S, and the floating body 4 is tsunami If it exists in the judgment area S, it is a tsunami.
  • the tsunami judgment unit 32 to be disconnected and the horizontal relative position obtained by the horizontal position calculation unit 31 are input, and the tsunami that sets the
  • the position measurement of the floating body 4 by the GPS receivers 11 and 21 is performed at predetermined time intervals. Therefore, the tsunami determination period in the tsunami determination unit 32 also matches this position measurement period. It has been made.
  • the above-mentioned “determined in the past” means that the previous position measurement cycle (tsunami determination cycle) This means that it was determined based on the horizontal relative position of the floating body 4 obtained in (5).
  • the tsunami determination area S determined based on the position means that it will be used for tsunami determination in the next position measurement cycle (which is also the tsunami determination cycle).
  • the floating body 4 is moored to an anchor (not shown) installed on the seabed via a mooring cable body 3 such as a chain.
  • a mooring cable body 3 such as a chain.
  • the boundary line indicating the outer edge of the movable range is referred to as a movement limit circle (movement limit line) A.
  • the center position of the floating body 4 on the sea surface of the movement limit circle A is the mooring center position C.
  • the mooring center position C corresponds to the horizontal position of the anchor on the seabed.
  • the floating body 4 can theoretically move within the movement limit circle A, but in reality, when an external force such as wind or ocean current (force due to meteorological conditions) acts. Means that the floating body 4 moves in that direction and the mooring center position force is also separated, and in this away direction (which is also the direction of external force action), for example, the opposite direction due to the weight of the mooring cord 3 Because of this force, the movable range becomes narrower, but in the opposite direction, the movable range becomes wider because it can move excessively by the distance from the mooring center position.
  • an external force such as wind or ocean current (force due to meteorological conditions) acts.
  • the floating body 4 moves in that direction and the mooring center position force is also separated, and in this away direction (which is also the direction of external force action), for example, the opposite direction due to the weight of the mooring cord 3 Because of this force, the movable range becomes narrower, but in the opposite direction, the movable range becomes wider because it can move excessively by the distance from the
  • this movable range is usually set to a size according to the horizontal position of the floating body 4 in consideration of external forces such as wind and ocean currents that can be assumed, and the floating body is set in a range beyond this movable range. If 4 moves, it can be judged that an excessive energy wave, that is, a tsunami, was applied.
  • a portion within the movement limit circle A and excluding the movable range that can be moved by an external force that can be normally assumed is defined as a tsunami determination region S.
  • a judgment boundary line B indicating the boundary of the movable range that can be moved by a normal external force
  • the tsunami judgment area S is the movement limit circle A.
  • the judgment boundary line B shown with diagonal lines.
  • the floating body 4 is located at the mooring center position C. However, normally, the floating body 4 is either one of the two due to an external force such as wind or ocean current.
  • the mooring cable 3 is floating at a position where the tension and the external force of the mooring cable body 3 are balanced.
  • the tsunami determination area S includes a movement limit circle A having a predetermined radius around the mooring center position C of the floating body 4, a plurality of straight lines L extending radially from the center F of the floating body 4, and the above movement limit.
  • Judgment boundary line B obtained by connecting a plurality of division points M, each of which is obtained by dividing the line segment L connecting each intersection K where the circle A intersects with the floating body center F with a predetermined ratio, into a curved line (may be a straight line) And the range between.
  • the tsunami determination area S is set using the ratio to the ratio (hereinafter referred to as the area setting coefficient, specifically, a positive value smaller than 1).
  • the tsunami determination area S is determined based on the current position (measurement position) of the floating body 4, that is, based on the horizontal relative position with respect to the mooring center position C, and naturally, in the mooring center position direction. Is easy to move, but difficult to move in the opposite direction, so multiple straight lines L extend radially from the center position F of the floating body 4, and the intersection K of each of these straight lines L and the movement limit circle A and the floating body center F Multiplying the line segment L by the above area setting factor to determine the movable range B of the floating body 4, and the range between the extension of this movable range B and the movement limit circle A (indicated by the diagonal lines) ) Is the tsunami determination area S.
  • the movable range B is easily moved to the mooring center position C side in the direction in which the floating body 4 is being flown.
  • the range on the far side becomes narrower, and on the opposite side it becomes wider.
  • the region setting coefficient is determined in advance by experience, experiment, etc., and the value is constant for the line segment L in all directions of the floating body center F. Depending on the force situation, different values for each line segment L may be used in stages.
  • the positioning data obtained by the mobile-side GPS receiver 11 of the mobile station 4 provided on the floating body 4 floating on the sea surface is transferred via the mobile-side and reference-side radio devices 12, 22 Then, it is input to the tsunami detection device 6 of the reference station 2, and the positioning data obtained by the reference-side GPS receiver 21 is also input to the tsunami detection device 6.
  • the horizontal relative position obtained by the horizontal position calculation unit 31 and the tsunami determination region S set in the previous position measurement cycle by the tsunami determination region setting unit 33 are input to the tsunami determination unit 32, where Then, it is determined whether or not the center position of the floating body 4 exists in the tsunami determination area S (step 2).
  • a tsunami determination area that is set in advance is used.
  • a notification to that effect is sent from the base station 2 to, for example, the Disaster Prevention Center (step 3).
  • the measurement position measured in the current position measurement cycle is the tsunami determination area setting unit.
  • the tsunami detection area S for the next determination is set (step 4), and the above procedure is repeated to perform tsunami detection processing.
  • the positioning data detected by the GPS receivers 21 and 11 of the reference station 2 provided on land and the mobile station 5 provided on the floating body 4 on the sea surface are used.
  • the real-time kinematic positioning method which is relative positioning, accurately measures at least the amount of movement of the floating body 4 relative to the reference station 2 in the horizontal direction, and obtains the horizontal relative position of the moving force force floating body 4 to the mooring center position. And according to the horizontal relative position of the floating body 4
  • the tsunami determination period is described as being performed in accordance with the position measurement period of the floating body.
  • the setting of the tsunami determination area S that does not need to be aligned with the position measurement period of the floating body is performed. Although it is performed at every measurement, it may be determined whether or not the force is a tsunami by using the tsunami determination area S set n times before every predetermined number of position measurements. In this way, by increasing the interval between the tsunami determination periods to some extent, it is possible to prevent erroneous recognition due to temporary disturbances such as gusts.
  • the position measurement cycle can be changed as appropriate. For example, if it is determined that the floating body is moving for each position measurement, the tsunami can be detected more quickly by shortening the tsunami determination cycle.
  • the tsunami determination region has been described by calculation based on the position of the floating body with respect to the mooring center position.
  • a reference direction the direction in which the floating body is located. It is also possible to obtain a tsunami determination area for this position according to the distance of the mooring center position force and use the tsunami determination area in this reference direction.
  • the movement of the floating body is the same as the mooring center position regardless of the orientation of the floating body in view of the mooring center position force.
  • a reference azimuth is determined in advance, and a reference tsunami determination area is set according to the position of the floating body in this reference azimuth.
  • the tsunami detection device 6 is installed in the reference station 2.
  • it should be a convenient location for system management regardless of where it is installed.
  • it may be installed in a land-based monitoring facility other than the reference station 2, and the positioning data obtained by the mobile-side GPS receiver 11 of the mobile station 5 and the reference-side GPS receiver 21 are used.
  • the obtained positioning data is sent to the monitoring facility via the reference-side wireless device 22.
  • the tsunami detection device 6 can also be installed on the mobile station 2 side.
  • the RT K method using GPS is used to determine the position of the floating body 4.
  • a DGPS positioning method or a single positioning method which is one of the relative positioning methods, is used. It can also be used, and it is possible to use other satellite positioning methods that are not limited to GPS.
  • the position of the floating body has been described as being obtained as a relative position with respect to the reference station.
  • the positioning coordinate system by the satellite including the relative positioning method and the single positioning method described above is used. It can also be handled as the absolute position used.
  • the horizontal position of a floating body moored on the sea surface is accurately measured using a satellite, and can be moved by an external force such as normal wind or ocean current based on this measurement position. If the area between the judgment boundary line indicating the extension of a certain range and the movement limit circle of the floating body is set as the tsunami judgment area, and the floating body exists in this tsunami judgment area, it is judged as a tsunami. Therefore, the tsunami can be detected with high accuracy simply by measuring the current horizontal position of the floating body. In particular, it greatly contributes to the reduction of damage caused by tsunami caused by a large earthquake.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

L’invention concerne un système de détection de tsunami possédant une section de calcul de position horizontale (31) permettant d’obtenir, sur la base des données de positionnement obtenues par les récepteurs GPS (11, 21), une position horizontale par rapport à la position centrale d’amarrage d’un corps flottant (4) ; une section de définition de région de détermination de tsunami (33) permettant de définir une région de détermination de tsunami S, en fonction de la position relative horizontale du corps flottant, pour une détermination subséquente ; et une section de détermination de tsunami (32) permettant de déterminer, sur la base de la position horizontale relative du corps flottant et d'une région de détermination de tsunami définie précédemment, si le corps flottant se trouve dans la région de détermination de tsunami.
PCT/JP2005/002601 2005-02-18 2005-02-18 Système de détection de tsunami WO2006087802A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2005/002601 WO2006087802A1 (fr) 2005-02-18 2005-02-18 Système de détection de tsunami
JP2007503540A JP4588065B2 (ja) 2005-02-18 2005-02-18 津波検知システム

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/002601 WO2006087802A1 (fr) 2005-02-18 2005-02-18 Système de détection de tsunami

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WO2006087802A1 true WO2006087802A1 (fr) 2006-08-24

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PCT/JP2005/002601 WO2006087802A1 (fr) 2005-02-18 2005-02-18 Système de détection de tsunami

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JP (1) JP4588065B2 (fr)
WO (1) WO2006087802A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009229432A (ja) * 2008-02-26 2009-10-08 Takehiko Furukawa Ｇｐｓ受信体を利用した津波観測システム
JP2012203747A (ja) * 2011-03-25 2012-10-22 Yasuaki Iwai 表示装置、描画用プログラム、防災システム

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10122860A (ja) * 1996-10-17 1998-05-15 Kaijo Corp 津波計
JPH1163984A (ja) * 1997-08-25 1999-03-05 Teruyuki Kato 津波検知システム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10122860A (ja) * 1996-10-17 1998-05-15 Kaijo Corp 津波計
JPH1163984A (ja) * 1997-08-25 1999-03-05 Teruyuki Kato 津波検知システム

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
TAKASHI FUJITA: "A development pf gps wave, tide and tsunami meter", PROC. OF WORKSHOP ON WAVE, TIDE OBSERVATIONS AND MODELING IN THE ASIAN PACIFIC REGION, 2004, pages 61 - 72, XP008051839 *
TERUYUKI KATO: "A new tsunami monitoring system using RTK-GPS", PAPERS AND ABSTRACTS FROM THE INTERNATIONAL TSUNAMI SYMPOSIUM 2001, 2001, pages 645 - 651, XP002990858 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009229432A (ja) * 2008-02-26 2009-10-08 Takehiko Furukawa Ｇｐｓ受信体を利用した津波観測システム
JP2012203747A (ja) * 2011-03-25 2012-10-22 Yasuaki Iwai 表示装置、描画用プログラム、防災システム

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JPWO2006087802A1 (ja) 2008-07-03
JP4588065B2 (ja) 2010-11-24

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