CN110766327A - Risk assessment method for island desalination water body under tidal action - Google Patents
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Abstract
The invention provides an island desalination water body risk assessment method under the action of tides, which comprises the following steps: taking the effective wave height and period of tide as a single risk index, and setting a single risk index grade standard; obtaining the effective wave height and the period of the evaluated tidal scene, and respectively determining the grade of the effective wave height and the period of the evaluated tidal scene according to the grade standard of the single risk index; establishing a single index conversion function, and converting the effective wave height and the period to obtain an effective wave height conversion function value and a period conversion function value; setting a reference sequence, calculating the correlation coefficient of each single conversion function value sequence and the reference sequence, and calculating the correlation degree according to each single index correlation coefficient; and determining the comprehensive index evaluation risk index grade according to the relevance. The method fully considers the influence of the effective wave height and the period of two important indexes representing tides on the risk of the island reef desalination water body, and can be used for evaluating the risk level of the tides on the island reef desalination water body.
Description
Technical Field
The invention relates to the technical field of risk assessment, in particular to a risk assessment method for island desalination water under the action of tides.
Background
The island reef desalination water body is formed under the combined action of abundant atmospheric precipitation, special coral geology and light salt water specific gravity difference, and coral island reefs with certain widths are possible to form desalination water bodies. If the water quality can reach the irrigation water standard, the ecological floating island can be used for resident living, greening, livestock breeding, island forestation and the like, and the life quality of residents on the island can be fundamentally improved; even industrial and agricultural development provides important basic conditions. Factors influencing the formation of the desalinated water body mainly include hydrogeological characteristics (permeability distribution, development conditions of cracks, pores and karst caves, unconformity depth and the like). Since the reef is located in the geographical location of the water around the sides, the tides may pose an unknown risk to desalinating a body of water.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
Therefore, the invention aims to provide a risk assessment method for the island desalination water body under the action of tide.
In order to achieve the above object, an embodiment of the present invention provides a method for assessing risk of an island reef desalination water body under tidal action, including the following steps:
step S1, taking the effective wave height and period of tide as a single risk index, and setting a single risk index grade standard;
step S2, obtaining the effective wave height and the period of the evaluated tidal scene, and respectively determining the grade of the effective wave height and the period of the evaluated tidal scene according to the grade standard of the single risk index;
step S3, establishing a single index conversion function, and converting the effective wave height and the period to obtain an effective wave height conversion function value and a period conversion function value, so that the value ranges of the effective wave height conversion function value and the period conversion function value are (0, 1);
step S4, setting a reference sequence, calculating the correlation coefficient of each single conversion function value sequence and the reference sequence, and calculating the correlation degree according to each single index correlation coefficient;
and step S5, determining the comprehensive index evaluation risk index grade according to the relevance.
Further, in step S1, the setting of the individual risk indicator level criteria includes the following steps:
the risk indicators are divided into 5 grades according to each single statistical indicator, including: extremely dangerous, highly dangerous, obvious dangerous, general dangerous, rare danger, different statistical indexes correspond different calamity grades.
Further, in step S3, a conversion function of the effective wave height is established, and a single-term index conversion function value of the effective wave height is calculated according to the following formula:
wherein, UpIs the conversion function value of the absolute value of the effective wave height; x is the absolute value of the effective wave height; lg is the logarithm of base 10X.
Further, in the step S3, a periodic conversion function is established, and a periodic one-term index conversion function value is calculated according to the following formula:
wherein, URIs a conversion function value of the cycle absolute value; x is the absolute value of the period; lg is the logarithm of base 10X. Further, in the step S4, a correlation coefficient λ of the significant wave height and the period is calculatedpAnd λZAccording to the following formula:
wherein, Deltap=|Uop-Up|;ΔR=|UoR-UR|;UOpAnd UORReference values for the effective wave height and the cycle absolute value respectively; u shapepAnd URThe comparison value is the conversion function value of the effective wave height and the absolute value of the period.
Further, in the step S4, the calculating a degree of association is according to the following formula:
wherein α is the degree of association, λpAnd λZRespectively, the correlation coefficient of the effective wave height and the period.
Further, in step S5, the determining a comprehensive index evaluation risk index level according to the relevance degree includes: and comparing the calculated association degree with a preset comprehensive index judgment risk index grade table to match and determine the comprehensive index judgment risk index grade corresponding to the association degree.
The invention relates to an island and reef desalination water body risk assessment method under the action of tides, which fully considers the influence of the effective wave height and the period of two important indexes representing the tides on the island and reef desalination water body risk and provides a new method for the island and reef desalination water body risk assessment under the action of the tides. The method theoretically fills the blank of risk assessment of the island desalination water body under the tidal action, can be used for assessing the risk level of the tide on the island desalination water body, and has important scientific value and practical significance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flow chart of a risk assessment method for an island desalination water body under the action of tide according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides a risk assessment method for an island desalination water body under the action of tides, which can be used for assessing the risk level of the tides on the island desalination water body.
As shown in fig. 1, the method for assessing the risk of the island desalinated water body under the action of tide according to the embodiment of the invention comprises the following steps:
and step S1, taking the effective wave height and period of the tide as a single risk index, and setting a single risk index grade standard.
Specifically, the method for setting the single risk index grade standard comprises the following steps:
the risk indicators are divided into 5 grades according to each single statistical indicator, including: extremely dangerous, highly dangerous, obvious dangerous, general dangerous, rare danger, different statistical indexes correspond different calamity grades.
In this step, different statistical indicators correspond to different disaster levels, as shown in table 1.
TABLE 1 Single index rating standards
And step S2, obtaining the effective wave height and the period of the evaluated tidal scene, and respectively determining the levels of the effective wave height and the period of the evaluated tidal scene according to the single risk index level standard.
Step S3, a single index conversion function is established, and the effective wave height and the period are converted to obtain an effective wave height conversion function value and a period conversion function value, so that the value ranges of the effective wave height conversion function value and the period conversion function value are (0, 1). The corresponding relationship between the single index level and the single conversion function value is shown in table 2.
Specifically, the value of the single index conversion function of the effective wave height is calculated according to the following formula:
wherein, UpIs the conversion function value of the absolute value of the effective wave height; x is the absolute value of the effective wave height, and the unit is meter; lg is the logarithm of base 10X.
The periodic single index transfer function value is calculated according to the following formula:
wherein, URIs a conversion function value of the cycle absolute value; x is the absolute value of the period and the unit is second; lg is the logarithm of base 10X.
TABLE 2 corresponding relationship between single index grade and single conversion function value
And matching the effective wave height conversion function value and the period conversion function value obtained by calculation with the grade relation in the table 2 to determine the index grade.
And step S4, setting a reference sequence according to a grey correlation analysis method, calculating the correlation coefficient of each single conversion function value sequence and the reference sequence, and calculating the correlation degree according to each single index correlation coefficient.
In this step, the correlation coefficient λ of the effective wave height and period is calculatedpAnd λZAccording to the following formula:
wherein, Deltap=|Uop-Up|;ΔR=|UoR-UR|;UOpAnd UORReference values of the effective wave height and the cycle absolute value of the south sea (the effective wave height is 10 meters, and the cycle is 4 seconds) respectively; u shapepAnd URThe comparison value is the conversion function value of the effective wave height and the absolute value of the period.
The degree of association is then calculated according to:
wherein α is the degree of association, λpAnd λRRespectively, the correlation coefficient of the effective wave height and the period.
And step S5, determining the comprehensive index evaluation risk index grade according to the association degree.
Specifically, determining the comprehensive index evaluation risk index grade according to the relevance comprises the following steps: and comparing the calculated association degree with a preset comprehensive index judgment risk index grade table (shown in table 3) to match and determine the comprehensive index judgment risk index grade corresponding to the association degree.
TABLE 3 comprehensive index rating
According to the method for evaluating the risk of the island desalination water body under the tidal action, the influence of the effective wave height and the period of two important indexes representing the tide on the risk of the island desalination water body is fully considered, and a new method for evaluating the risk of the island desalination water body under the tidal action is provided. The method theoretically fills the blank of risk assessment of the island desalination water body under the tidal action, can be used for assessing the risk level of the tide on the island desalination water body, and has important scientific value and practical significance.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. An island desalination water body risk assessment method under the action of tides is characterized by comprising the following steps:
step S1, taking the effective wave height and period of tide as a single risk index, and setting a single risk index grade standard;
step S2, obtaining the effective wave height and the period of the evaluated tidal scene, and respectively determining the grade of the effective wave height and the period of the evaluated tidal scene according to the grade standard of the single risk index;
step S3, establishing a single index conversion function, and converting the effective wave height and the period to obtain an effective wave height conversion function value and a period conversion function value, so that the value ranges of the effective wave height conversion function value and the period conversion function value are positioned in the (0,1) interval;
step S4, setting a reference sequence, calculating the correlation coefficient of each single conversion function value sequence and the reference sequence, and calculating the correlation degree according to each single index correlation coefficient;
and step S5, determining the comprehensive index evaluation risk index grade according to the relevance.
2. The tidal island desalination water risk assessment method according to claim 1, wherein the step S1 of setting a single risk index rating standard comprises the steps of:
the risk indicators are divided into 5 grades according to each single statistical indicator, including: extremely dangerous, highly dangerous, obvious dangerous, general dangerous, rare danger, different statistical indexes correspond different calamity grades.
3. The tidal island desalination water risk assessment method according to claim 1, wherein in step S3, a transfer function of the absolute value of the effective wave height is established, and a one-index transfer function value of the absolute value of the effective wave height is calculated according to the following formula:
wherein, UpIs the conversion function value of the absolute value of the effective wave height; x is the absolute value of the effective wave height; lg is the logarithm of base 10X.
4. The tidal island desalination water risk assessment method of claim 1, wherein in step S3, a periodic transfer function is established, and a periodic monomial index transfer function value is calculated according to the following formula:
wherein, URIs a conversion function value of the cycle absolute value; x is the absolute value of the period; lg is the logarithm of base 10X.
5. The tidal island desalination water risk assessment method according to claim 1, wherein in step S4, the correlation coefficient λ of the significant wave height and period is calculatedpAnd λZAccording to the following formula:
wherein, Deltap=|Uop-Up|;ΔR=|UoR-UR|;UOpAnd UORReference values for the effective wave height and the cycle absolute value respectively; u shapepAnd URThe comparison value is the conversion function value of the effective wave height and the absolute value of the period.
6. The tidal island desalination water risk assessment method according to claim 5, wherein in step S4, the calculating of the correlation degree is according to the following formula:
wherein α is the degree of association, λpAnd λRRespectively, the correlation coefficient of the effective wave height and the period.
7. The tidal island desalination water risk assessment method according to claim 1, wherein the determining a composite index evaluation risk index grade according to the correlation degree in step S5 comprises: and comparing the calculated association degree with a preset comprehensive index judgment risk index grade table to match and determine the comprehensive index judgment risk index grade corresponding to the association degree.
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