WO1997002736A1 - Method of protecting against tropical cyclones - Google Patents

Method of protecting against tropical cyclones Download PDF

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Publication number
WO1997002736A1
WO1997002736A1 PCT/GB1995/002203 GB9502203W WO9702736A1 WO 1997002736 A1 WO1997002736 A1 WO 1997002736A1 GB 9502203 W GB9502203 W GB 9502203W WO 9702736 A1 WO9702736 A1 WO 9702736A1
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WO
WIPO (PCT)
Prior art keywords
vortex
zone
stage
convective
deceleration
Prior art date
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PCT/GB1995/002203
Other languages
French (fr)
Inventor
Sergei Leonidovich Vasilyev
Original Assignee
G.W.P. Limited
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 G.W.P. Limited filed Critical G.W.P. Limited
Priority to AU34825/95A priority Critical patent/AU3482595A/en
Publication of WO1997002736A1 publication Critical patent/WO1997002736A1/en

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G15/00—Devices or methods for influencing weather conditions

Definitions

  • This invention relates to meteorology and more, specifically to actively affecting cloud systems (convective clouds,) , to prevent and protect human life and activity against the impact of dangerous phenomena such as hurricanes or typhoons.
  • a method of actively affecting cloud systems, in particular tropical cyclones is known in which the suppression of a tropical cyclone is achieved by covering the area of intensive ascending air flows bounded by the cyclone eye with a monolayer of a reagent (hexadexane) .
  • This method however suffers from major disadvantages in that: i) ocean ecology and energy balance are disturbed; and ii) expensive equipment is needed to distinguish the reagent and large quantities of reagent are needed.
  • the Fury Storm Project is also a known research program devoted to actively influencing hurricanes.
  • the main concept of seeding in the Fury Storm Project is to form a new cloud wall from clouds of rain strips by a dynamic seeding method. Clouds are seeded by aircraft dropping special small pyrotechnic devices 250mm long and 15mm in diameter containing 17g of silver iodide in mixture with 78% AgJOa by mass.
  • seeded clouds in a rain strip grow up to the divergence zone in the upper troposphere, whereas the increased inflow at sea level deviates air from the cloud wall surrounding the hurricane eye.
  • the total energy- balance includes additional inflow of latent heat of condensation, which is several times more than direct inflow due to the freezing of overcooled water.
  • the main and principal disadvantage of the known methods is that they do not take into account the change in hurricane movement path caused by artificially changing its energetics due to the active control of cloud systems.
  • active measures are aimed at a fuller suppression of hurricane energy in its central part.
  • a series of descending motions are created in concentric circles which are about 10-15km apart from the hurricane eye and from one another and have a circular speed of not more than 5-10km per the period of time not exceeding the regeneration period of ascending motions of convective flows in the action zone.
  • a series of explosions near the hurricane eye initiates powerful descending motions which are self-developing due to the inner unstable energy of the hurricane itself.
  • a system of initiated descending motions is directed in a reverse direction to the natural circulation of the hurricane and, thus, considerably abates it.
  • the main disadvantage of the prior art methods is their complexity in suppressing the unstable energy release process in the atmosphere and high material costs. Furthermore, whilst they partially ease the hurricanes intensity, they do not take into account the change in the path and velocity of its movement after the action and all the ensuing consequences thereof.
  • a method of protection against tropical cyclones comprising the steps of determining the path parameters of the tropical cyclone, selecting action zones therein and periodically acting in said zones on convective flows in the cloud system of the tropical cyclone, measuring the wind field while determining path parameters and localizing the zones of maximum deceleration and maximum value of the tangential component of vortex rotation, both of these zones or one of them being chosen as action zones thereby ensuring the movement of the tropical cyclone in a safe direction characterised in that in order to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility thereof and the displacement of the deceleration zone towards the vortex centre, the regeneration of the convective flow is caused in the zone of maximum values of the tangential component.
  • the dissipation of the convective flows is caused in the zone of deceleration to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility and displace the zone of tangential component deceleration towards the vortex centre.
  • the regeneration of the convective flows is caused in the zone of maximum values of the tangential component, while the dissipation of the convective flows is caused in the zone of deceleration to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility and displace the zone of tangential component deceleration towards the vortex centre.
  • a bank of convective clouds is successively exposed to the action, beginning with the most developed cloud, and the dissipation of the convective flows is caused in the zone of the tangential component deceleration to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation.
  • a bank of convective clouds is preferably successively exposed to the action beginning with the most developed cloud, and the regeneration of the convective flows is caused in the zone of maximum values of the tangential component, the action being repeated until the involution of the bank into a cluster, i.e. a meso-scale formation takes place in order to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation.
  • a bank of clouds is successively exposed to the action, beginning with the most developed cloud, the dissipation of the convective flows being caused in the zone of the tangential component deceleration and the regeneration of the convective flows being caused in the zone of maximum values of the tangential component in order to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation.
  • the method of the present invention achieves the following while determining path parameters (position of the eye, velocity and direction of movement) , the wind field is measured by determining the position of the zones of maximum deceleration and maximum value of tangential component of vortex rotation. These two zones or one of them are chosen as zones to act on convective flows in the cloud system of the tropical cyclone, the action being exerted by artificial regeneration (formation of ascending motions) or artificial dissipation (formation of descending motions) of convective flows.
  • the proposed technical solution is based on a previously unknown regularity in the movement of a vortex formation in the atmosphere which was first established experimentally using a convective cloud as an example.
  • a vortex formation in the atmosphere moves relative to the point of maximum deceleration of the module-highest tangential rotation component; velocity and direction of movement regularly changes depending on the potential of forces acting on the dynamic "vortex-external wind" system.
  • Other previously known methods of computing the movement of tropical cyclones, hurricanes, and typhoons do not make it possible to obtain the movement vector from first observation data (it is usually necessary to make at least two series of observations separated from one another by several hours) , i.e. the vector of how the tropical cyclone has been moving is obtained, which dramatically reduces promptitude of analysis and forecastability of a development phase and consequently the displacement of the tropical cyclone.
  • Figure 1 shows a kinematic "vortex-external wind" scheme illustrating the position of maximum deceleration point A at various phases in the development of the dynamic system.
  • a phase in the development of the dynamic system is determined by the relationship between external wind vector U 0 and tangential rotation component vector U.
  • Modules of the said vectors are determined by potentials of active forces, i.e. the non-uniformity of fields of pressure, temperature and humidity, gravitation component and orographic obstacles.
  • Figure 2 shows the wind field in a tropical cyclone where zones with maximum air velocities are highlighted.
  • a tachogram with maximum wind velocities is plotted.
  • the position of point A i.e. the point of maximum deceleration of module-highest tangential rotation component
  • the line of position of vortex layer is then drawn from this point through the vortex centre. All vectors in the vortex layer are parallel and directed normally to the position line.
  • the vector of highest velocity in the vortex layer is constructed (to scale) on the vortex side opposite to point A.
  • point B The beginning of this vector in Figure 2 is marked with point B and its position corresponds to the maximum value of the tangential vortex rotation vector.
  • the movement path of the tropical cyclone can be made to deviate in a direction which coincides with the vortex rotation direction, i.e. to the left for a cyclone that has formed in the northern hemisphere, and to the right if the cyclone has formed in the southern hemisphere.
  • the path of the tropical cyclone can be made to deviate in a direction opposite to that of the vortex rotation, i.e. to the right for a cyclone formed in the northern hemisphere, and to the left if it has formed in the southern hemisphere.
  • zone A By causing regeneration in zone A and, at the same time, dissipation in zone B (the zone of maximum tangential component value) makes the cyclonic path deviate in a direction which coincides with that of the vortex rotation and changes it into a looplike path, which simultaneously slows down movement velocity. 4. By causing simultaneous regeneration of convective flows in both zones, the cyclonic path can be made to deviate in a direction coinciding with that of the vortex rotation and changed into a looplike path, which simultaneously accelerates movement velocity.
  • zone B By causing the regeneration of convective flows in zone B, the movement of a tropical cyclone can be accelerated without changing its course so that it leaves the area adjacent to that to be protected as soon as possible; ii) By causing the dissipation in the same zone B, the velocity of the cyclone can be slowed down. It is expedient to apply the latter combination in case of a dying-out cyclone in order to accelerate its destruction.
  • Regeneration of convective flows in clouds is normally induced by placing in them small portions of an ice- forming reagent (silver iodide) or cooling agent (solid carbonic acid) .
  • the reagent is injected into the cloud top.
  • the action is exerted for a time period equal to or longer than the period of regeneration of convective flows determined by the timing of changes in the altitude of the upper cloud boundary or with the help of radar.
  • a brightly outlined top of the cloud growing in height is an indication that regeneration has begun.
  • the airplane may serve as an indication for the place and time to introduce the reagent.
  • the airplane flies directly over the cloud top at 500-600m above its upper boundary to avoid any negative effect due to the dynamic impact caused by its wake.
  • the heat of phase transitions (condensation and crystallization) released as a result of the active intervention reinforces convective flows in the clouds.
  • Dissipation (suppression) of convective flows can be brought about by dropping into the cloud top self-opening wrappers weighing 20-30kg which contain course-dispersed powder with a specific surface area of no less than 10 m/g. While falling, particles of the course-dispersed powder induce the development of descending motions which cause dissipation of the unstable energy and of ascending motions in the clouds. The action is repeated for time periods equal to or shorter than the period of regeneration of convective flows in the clouds (approximately 15-20 min) .
  • the preferred method of the present invention is beneficial because it not only allows the unstable energy release process in a tropical cyclone (hurricane, typhoon) to be controlled but it also promptly takes into account changes in the cyclonic path and velocity after the action.
  • implementation of the method enables projects and installations to be protected as well as the protection of human life and activity in regions exposed to the destructive effects of tropical cyclones (hurricanes, typhoons) .

Abstract

A method of protecting an environment or area against tropical cyclones is disclosed involving determining the path parameters of the tropical cyclone, selecting action zones therein and periodically acting in said zones on convective flows in the cloud system of the tropical cyclone, measuring the wind field while determining path parameters and localizing the zones of maximum deceleration and maximum value of the tangential component of vortex rotation, both of these zones or one of them being chosen as action zones thereby ensuring the movement of the tropical cyclone in a safe direction. Regeneration of the convective flow is caused in the zone of maximum values of the tangential component to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility and displace the deceleration zone towards the vortex centre.

Description

METHOD OF PROTECTING AGAINST TROPICAL CYCLONES
This invention relates to meteorology and more, specifically to actively affecting cloud systems (convective clouds,) , to prevent and protect human life and activity against the impact of dangerous phenomena such as hurricanes or typhoons.
A method of actively affecting cloud systems, in particular tropical cyclones, is known in which the suppression of a tropical cyclone is achieved by covering the area of intensive ascending air flows bounded by the cyclone eye with a monolayer of a reagent (hexadexane) . This method however suffers from major disadvantages in that: i) ocean ecology and energy balance are disturbed; and ii) expensive equipment is needed to distinguish the reagent and large quantities of reagent are needed.
The Fury Storm Project is also a known research program devoted to actively influencing hurricanes. The main concept of seeding in the Fury Storm Project is to form a new cloud wall from clouds of rain strips by a dynamic seeding method. Clouds are seeded by aircraft dropping special small pyrotechnic devices 250mm long and 15mm in diameter containing 17g of silver iodide in mixture with 78% AgJOa by mass. As a result of the stimulation created thereby, seeded clouds in a rain strip grow up to the divergence zone in the upper troposphere, whereas the increased inflow at sea level deviates air from the cloud wall surrounding the hurricane eye. The total energy- balance includes additional inflow of latent heat of condensation, which is several times more than direct inflow due to the freezing of overcooled water.
The main and principal disadvantage of the known methods is that they do not take into account the change in hurricane movement path caused by artificially changing its energetics due to the active control of cloud systems.
In another proposed procedure, active measures are aimed at a fuller suppression of hurricane energy in its central part. To this end, a series of descending motions are created in concentric circles which are about 10-15km apart from the hurricane eye and from one another and have a circular speed of not more than 5-10km per the period of time not exceeding the regeneration period of ascending motions of convective flows in the action zone. A series of explosions near the hurricane eye initiates powerful descending motions which are self-developing due to the inner unstable energy of the hurricane itself. As this takes place, a system of initiated descending motions is directed in a reverse direction to the natural circulation of the hurricane and, thus, considerably abates it. The main disadvantage of the prior art methods is their complexity in suppressing the unstable energy release process in the atmosphere and high material costs. Furthermore, whilst they partially ease the hurricanes intensity, they do not take into account the change in the path and velocity of its movement after the action and all the ensuing consequences thereof.
It is an object of the present invention therefore to reduce expense and increase reliability by making a tropical cyclone follow a safe course.
According to the invention, there is provided a method of protection against tropical cyclones comprising the steps of determining the path parameters of the tropical cyclone, selecting action zones therein and periodically acting in said zones on convective flows in the cloud system of the tropical cyclone, measuring the wind field while determining path parameters and localizing the zones of maximum deceleration and maximum value of the tangential component of vortex rotation, both of these zones or one of them being chosen as action zones thereby ensuring the movement of the tropical cyclone in a safe direction characterised in that in order to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility thereof and the displacement of the deceleration zone towards the vortex centre, the regeneration of the convective flow is caused in the zone of maximum values of the tangential component.
Preferably, the dissipation of the convective flows is caused in the zone of deceleration to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility and displace the zone of tangential component deceleration towards the vortex centre.
Conveniently the regeneration of the convective flows is caused in the zone of maximum values of the tangential component, while the dissipation of the convective flows is caused in the zone of deceleration to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility and displace the zone of tangential component deceleration towards the vortex centre.
Suitably, a bank of convective clouds is successively exposed to the action, beginning with the most developed cloud, and the dissipation of the convective flows is caused in the zone of the tangential component deceleration to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation.
A bank of convective clouds is preferably successively exposed to the action beginning with the most developed cloud, and the regeneration of the convective flows is caused in the zone of maximum values of the tangential component, the action being repeated until the involution of the bank into a cluster, i.e. a meso-scale formation takes place in order to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation.
Preferably, a bank of clouds is successively exposed to the action, beginning with the most developed cloud, the dissipation of the convective flows being caused in the zone of the tangential component deceleration and the regeneration of the convective flows being caused in the zone of maximum values of the tangential component in order to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation.
The method of the present invention achieves the following while determining path parameters (position of the eye, velocity and direction of movement) , the wind field is measured by determining the position of the zones of maximum deceleration and maximum value of tangential component of vortex rotation. These two zones or one of them are chosen as zones to act on convective flows in the cloud system of the tropical cyclone, the action being exerted by artificial regeneration (formation of ascending motions) or artificial dissipation (formation of descending motions) of convective flows.
The prior art methods do not describe operations which are performed to purposefully change the path and velocity of vortex formations.
A major distinction between the present invention and the prior art lies in the basic concept that convective clouds are acted upon not to suppress the development of a tropical cyclone, but rather to actively control the process of unstable energy release and, in so doing, also take into account the change in the cyclone's displacement vector after the action has been exerted.
The proposed technical solution is based on a previously unknown regularity in the movement of a vortex formation in the atmosphere which was first established experimentally using a convective cloud as an example.
A vortex formation in the atmosphere moves relative to the point of maximum deceleration of the module-highest tangential rotation component; velocity and direction of movement regularly changes depending on the potential of forces acting on the dynamic "vortex-external wind" system. Other previously known methods of computing the movement of tropical cyclones, hurricanes, and typhoons do not make it possible to obtain the movement vector from first observation data (it is usually necessary to make at least two series of observations separated from one another by several hours) , i.e. the vector of how the tropical cyclone has been moving is obtained, which dramatically reduces promptitude of analysis and forecastability of a development phase and consequently the displacement of the tropical cyclone.
It has been established (by mathematical modelling methods) that a major role in the formation of the circulation of atmospheric vortexes is played by latent evaporation heat in the ascending air flow in well- developed convective clouds. This circumstance has initiated searches for technical solutions aimed at abating a tropical cyclone (typhoon) by actively affecting convective clouds in its cloud system.
Figure 1 shows a kinematic "vortex-external wind" scheme illustrating the position of maximum deceleration point A at various phases in the development of the dynamic system. A phase in the development of the dynamic system is determined by the relationship between external wind vector U0 and tangential rotation component vector U. Modules of the said vectors are determined by potentials of active forces, i.e. the non-uniformity of fields of pressure, temperature and humidity, gravitation component and orographic obstacles.
The tangential rotation vector of a vortex is conditioned by the unstable energy release in the air mass and is related to the vertical component by the continuity equation: div Ux>y,2= 0
It will be clear that if action is exerted upon the convective component (vertical U) , this action will bring about changes in horizontal components U, U and, consequently, the tangential component of vortex rotation; so the position of deceleration point A will also change.
Figure 2 shows the wind field in a tropical cyclone where zones with maximum air velocities are highlighted. By superimposing the kinematic scheme of Figure 1 on the wind field shown in Figure 2, it is possible to obtain the vector of cyclone displacement from available data. By module and direction, the estimated vector coincides with the actual one shown in the upper part of Figure 2. Thus, the aforementioned regularity in the movement of a vortex formation in the atmosphere is true for tropical cyclones.
Following the basic concept of the present invention, i.e. active control over the unstable energy release process, and taking into account changes in the displacement vector of a tropical cyclone after exerting action upon it, the following procedure for performing technological operations is proposed by way of example.
From measurement data obtained (e.g. with the help of a Doppler radar) for the wind field in a tropical cyclone, a tachogram with maximum wind velocities is plotted. On the tachogram, the position of point A, i.e. the point of maximum deceleration of module-highest tangential rotation component, is localized. The line of position of vortex layer is then drawn from this point through the vortex centre. All vectors in the vortex layer are parallel and directed normally to the position line. The vector of highest velocity in the vortex layer is constructed (to scale) on the vortex side opposite to point A. The beginning of this vector in Figure 2 is marked with point B and its position corresponds to the maximum value of the tangential vortex rotation vector. The end of this vector is connected with point A, which gives the line of vector profile in the vortex layer. The vector of tropical cyclone displacement is then constructed from the vortex centre, this vector being normal to the position line and bounded by the profile line of the wind. Module value is obtained using a scale factor to convert the modules geometrical length into measurement units . If a tropical cyclone is shifting in a threatening direction, its path can be changed using any one of the six combinations of operations disclosed hereafter.
1. By causing the regeneration of convective flows (the artificial formation of ascending motions) in the zone of maximum deceleration of the tangential vortex rotation component (in zone A) , the movement path of the tropical cyclone can be made to deviate in a direction which coincides with the vortex rotation direction, i.e. to the left for a cyclone that has formed in the northern hemisphere, and to the right if the cyclone has formed in the southern hemisphere.
2. By causing the dissipation of convective flows (the artificial formation of descending motions) in the same zone the path of the tropical cyclone can be made to deviate in a direction opposite to that of the vortex rotation, i.e. to the right for a cyclone formed in the northern hemisphere, and to the left if it has formed in the southern hemisphere.
3. By causing regeneration in zone A and, at the same time, dissipation in zone B (the zone of maximum tangential component value) makes the cyclonic path deviate in a direction which coincides with that of the vortex rotation and changes it into a looplike path, which simultaneously slows down movement velocity. 4. By causing simultaneous regeneration of convective flows in both zones, the cyclonic path can be made to deviate in a direction coinciding with that of the vortex rotation and changed into a looplike path, which simultaneously accelerates movement velocity.
5. By causing simultaneous dissipation of convective flows in both zones makes the path of a tropical cyclone deviate in a direction opposite to that of the vortex rotation and it changes into a looplike path, which simultaneously slows down movement velocity.
6. By causing the dissipation of convective flows in zone A and the regeneration thereof in zone B makes the cyclonic path deviate in a direction opposite to that of the vortex rotation, which simultaneously accelerates movement velocity.
If a tropical cyclone is shifting in a safe direction close by an area to be protected and if there is a probability that it may spontaneously change its course, one of the following two combinations should be used.
i) By causing the regeneration of convective flows in zone B, the movement of a tropical cyclone can be accelerated without changing its course so that it leaves the area adjacent to that to be protected as soon as possible; ii) By causing the dissipation in the same zone B, the velocity of the cyclone can be slowed down. It is expedient to apply the latter combination in case of a dying-out cyclone in order to accelerate its destruction.
Regeneration of convective flows in clouds is normally induced by placing in them small portions of an ice- forming reagent (silver iodide) or cooling agent (solid carbonic acid) . The reagent is injected into the cloud top. The action is exerted for a time period equal to or longer than the period of regeneration of convective flows determined by the timing of changes in the altitude of the upper cloud boundary or with the help of radar. A brightly outlined top of the cloud growing in height (as visually observed from an airplane) is an indication that regeneration has begun. The appearance of fibrous, vertically oriented structures on the cloud top
(determined visually from an airplane) may serve as an indication for the place and time to introduce the reagent. The airplane flies directly over the cloud top at 500-600m above its upper boundary to avoid any negative effect due to the dynamic impact caused by its wake. The heat of phase transitions (condensation and crystallization) released as a result of the active intervention reinforces convective flows in the clouds.
Dissipation (suppression) of convective flows can be brought about by dropping into the cloud top self-opening wrappers weighing 20-30kg which contain course-dispersed powder with a specific surface area of no less than 10 m/g. While falling, particles of the course-dispersed powder induce the development of descending motions which cause dissipation of the unstable energy and of ascending motions in the clouds. The action is repeated for time periods equal to or shorter than the period of regeneration of convective flows in the clouds (approximately 15-20 min) .
Depending on the objective, operations in the procedure should be carried out either prior to the moment when a tropical cyclone leaves the zone to be protected or before it completely dissipates its energy.
The preferred method of the present invention is beneficial because it not only allows the unstable energy release process in a tropical cyclone (hurricane, typhoon) to be controlled but it also promptly takes into account changes in the cyclonic path and velocity after the action. Thus, implementation of the method enables projects and installations to be protected as well as the protection of human life and activity in regions exposed to the destructive effects of tropical cyclones (hurricanes, typhoons) .

Claims

1. A method of protection against tropical cyclones comprising the steps of determining the path parameters of the tropical cyclone, selecting action zones therein and periodically acting in said zones on convective flows in the cloud system of the tropical cyclone, measuring the wind field while determining path parameters and localizing the zones of maximum deceleration and maximum value of the tangential component of vortex rotation, both of these zones or one of them being chosen as action zones thereby ensuring the movement of the tropical cyclone in a safe direction characterised in that in order to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility thereof and the displacement of the deceleration zone towards the vortex centre, the regeneration of the convective flow is caused in the zone of maximum values of the tangential component.
2. A method according to claim 1 characterised in that in order to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility and the displacement of the zone of tangential component deceleration towards the vortex centre, the dissipation of the convective flows is caused in the zone of deceleration.
3. A method according to claim 1 characterised in that in order to increase the vortex intensity (at the stage of a meso-scale formation) to the stage of a young tropical cyclone with low mobility thereof and the displacement of the zone of tangential component deceleration towards the vortex centre, the regeneration of the convective flows is caused in the zone of maximum values of the tangential component, while the dissipation of the convective flows is caused in the zone of deceleration.
4. A method according to claim 1 characterised in that in order to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation, a bank of convective clouds is successively exposed to the action, beginning with the most developed cloud, and the dissipation of the convective flows is caused in the zone of the tangential component deceleration.
5. A method according to claim 1 characterised in that in order to increase the size and intensity of the vortex (at the stage of a rotating convective cloud) to the stage of a meso-scale formation, a bank of convective clouds is successively exposed to the action beginning with the most developed cloud, and the regeneration of the convective flows is caused in the zone of maximum values of the tangential component, the action being repeated until the involution of the bank into a cluster, i.e. a meso-scale formation takes place.
6. A method according to claim 1 characterised in that in order to increase the size and intensity of the vortex
(at the stage of a rotating convective cloud) to the stage of a meso-scale formation, a bank of clouds is successively exposed to the action, beginning with the most developed cloud, the dissipation of the convective flows being caused in the zone of the tangential component deceleration and the regeneration of the convective flows being caused in the zone of maximum values of the tangential component.
PCT/GB1995/002203 1995-07-13 1995-09-18 Method of protecting against tropical cyclones WO1997002736A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001087048A1 (en) * 1999-03-02 2001-11-22 Vadim Nikolaevich Pelevin Method for weakening tropical cyclones (hurricanes, typhoons)
RU2514409C2 (en) * 2009-07-07 2014-04-27 Дмитрий Николаевич Бодров Method of converting thermal cyclone into front and device for its implementation

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2001087048A1 (en) * 1999-03-02 2001-11-22 Vadim Nikolaevich Pelevin Method for weakening tropical cyclones (hurricanes, typhoons)
RU2514409C2 (en) * 2009-07-07 2014-04-27 Дмитрий Николаевич Бодров Method of converting thermal cyclone into front and device for its implementation

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