CN106759062B - A kind of bank erosion amount prediction technique - Google Patents
A kind of bank erosion amount prediction technique Download PDFInfo
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- CN106759062B CN106759062B CN201611051022.6A CN201611051022A CN106759062B CN 106759062 B CN106759062 B CN 106759062B CN 201611051022 A CN201611051022 A CN 201611051022A CN 106759062 B CN106759062 B CN 106759062B
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- 230000003628 erosive effect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000002689 soil Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 230000009466 transformation Effects 0.000 claims abstract description 5
- 230000001133 acceleration Effects 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 239000013535 sea water Substances 0.000 claims abstract description 4
- 238000013519 translation Methods 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000000116 mitigating effect Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V20/00—Geomodelling in general
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Abstract
A kind of bank erosion amount prediction technique, includes the following steps：1) breaker wave height H is calculatedb, Hb=0.39g0.2(TH0 2)0.4, g is acceleration of gravity, H0For deep-water weave wave height, T is wave period, and h is that sandy beach is surged depth；2) velocity of wave translation u at sandy beach is calculated0：3) the corresponding wave number N of the different wave height of calculatingi；4) it calculates wave and corrodes shear stress caused by beach face：τw=0.5Fwρwu0 2, in formula, FwThe coefficient of friction resistance between flow and the soil body, ρwFor density of sea water；5) sand anti-erosion critical shear stress is calculated：In formula, dsFor sand median particle diameter, ρsFor sand grains densityFor the internal friction angle of sand；6) erosion amount at sandy beach is calculated：In formula, EsFor wave erosion amount, NiFor the corresponding wave number of i-th of wave height, n is wave height number, KsIt is the transformation ratio for converting the agent of erosion to erosion amount with a, a takes 1.0.The present invention has the advantages that step is simple, result is reliable, it is intended to provide theoretical direction for sand waste mitigation and protection.
Description
Technical field
The present invention relates to a kind of prediction techniques for the bank erosion amount under the strong wave action of typhoon weather.
Background technology
China's southeastern coast suffers from the influence of violent typhoon several times every year, and high-amplitude wave wave influences seabeach sand caused by typhoon
Larger, wave leads to sandy beach sand suspension, is brought at the deeper depth of water under Wave power effect, causes seabeach sand serious
It corrodes.By taking " Mo Ladi " typhoon in 2016 as an example, wave caused by the typhoon causes the Eroded at Xiamen sandy beach, according to tune
It looks into, extra large deep blue Wu Guan bank erosion amounts reach 10~15cm height, and the TongAn communities Hou Tian one reach 23 with artificial bank erosion amount~
54cm height.For the erosion amount at sandy beach, other than field investigation, it is a kind of preferable side to carry out prediction using theoretical model
Method, current prediction technique are all based on greatly what the Transport Model of silt particle, silt particle source and wave current feature were established, these methods are mostly
More complicated, certain parameters are difficult to determine, are not easy to engineer and grasp use.
Invention content
It is a primary object of the present invention to overcome drawbacks described above in the prior art, propose it is a kind of based on the wave current agent of erosion and
The bank erosion amount prediction technique of sand shear strength model has the advantages that using simple, result is reliable, it is intended to subtract for sandy beach
Calamity and protection provide theoretical direction.
The present invention adopts the following technical scheme that：
A kind of bank erosion amount prediction technique, includes the following steps：
1) breaker wave height H is calculatedb, Hb=0.39g0.2(TH0 2)0.4, g is acceleration of gravity, H0For deep-water weave wave height, T is
Wave period, h are that sandy beach is surged depth；
2) velocity of wave translation u at sandy beach is calculated0：
3) the corresponding wave number N of the different wave height of calculatingi；
4) it calculates wave and corrodes shear stress caused by beach face：
τw=0.5Fwρwu0 2
In formula, FwThe coefficient of friction resistance between flow and the soil body, ρwFor density of sea water；
5) sand anti-erosion critical shear stress is calculated：
In formula, dsFor sand median particle diameter, ρsFor sand grains densityFor the internal friction angle of sand；
6) erosion amount at sandy beach is calculated：
In formula, EsFor wave erosion amount, NiFor the corresponding wave number of i-th of wave height, n is wave height number, KsBeing respectively with a will
The agent of erosion is converted into the transformation ratio of erosion amount, Ks4.57mm/d, a is taken to take 1.0.
Preferably, it in step 1), according to wave monitoring station monitoring data, determines deep water wave parameter during typhoon, wraps
Include deep-water weave wave height H0, wave period T and sandy beach are surged depth.
By the above-mentioned description of this invention it is found that compared with prior art, the present invention has the advantages that：
The present invention is based on the wave current agents of erosion and sand shear strength model to carry out bank erosion amount prediction, has step letter
Advantage single, result is reliable, it is intended to provide theoretical direction for sand waste mitigation and protection.
Description of the drawings
Fig. 1 is the corresponding wave height number of different wave height；
Fig. 2 is a certain beach face erosion amount section at sandy beach；
Fig. 3 is another beach face erosion amount section at sandy beach.
Specific implementation mode
Below by way of specific implementation mode, the invention will be further described.
A kind of bank erosion amount prediction technique, implementation step are：
1) according to wave monitoring station monitoring data, deep water wave parameter during typhoon, including deep-water weave wave height H are determined0, wave
Surge depth h for unrestrained cycle T and sandy beach.Calculate breaker wave height Hb,
Hb=0.39g0.2(TH0 2)0.4 (1)
In formula, g is acceleration of gravity.
2) velocity of wave translation u at sandy beach is calculated0：
3) the corresponding wave number N of the different wave height of calculatingi；
4) it calculates wave and corrodes shear stress caused by beach face,
τw=0.5Fwρwu0 2 (3)
In formula, FwThe coefficient of friction resistance between flow and the soil body, Fw=0.01-0.10, ρwFor density of sea water, 1.025g/ is taken
cm3。
5) sand anti-erosion critical shear stress is calculated,
In formula, dsFor sand median particle diameter, ρsFor sand grains density, 2.70-2.71g/cm is taken3,For the internal friction angle of sand.
6) erosion amount at sandy beach is calculated,
In formula, EsFor wave erosion amount, NiFor the corresponding wave number of i-th of wave height, n is wave height number, KsBeing respectively with a will
The agent of erosion is converted into the transformation ratio of erosion amount, Ks4.57mm/d, a is taken to take 1.0.
When it is implemented, according to the method described above, determining wave and sand parameter, the sandy beach during a typhoon is finally found out
Erosion amount.
Case study on implementation, southeastern coast city of China are influenced by a violent typhoon, and the somewhere sandy beach soil body is fine sand, through surveying
Examination, median particle diameter ds=0.25mm, sand grains density ps=2.70g/cm3, inner friction angel of sandy soil is 20 °；At wave monitoring station
The high-amplitude wave wave effect lasts about 10h of (depth of water 53.0m) monitoring, as shown in Figure 1, wave is flat for the corresponding wave number of different wave height
The equal period is 5.4s, and depth is surged as 2.5m, the coefficient of friction resistance F between flow and the soil body in sandy beachw0.05 is taken, erosion amount transformation system
Number Ks=4.57mm/d.Two beach profiles are as shown in Figure 2 and Figure 3, prediction technique using the present invention, and prediction is strong by this time
After typhoon wave corrodes, the erosion amount in seabeach face, the elevation after corroding indicates in fig. 2.As can be seen that erosion amount is substantially
Reduce with the increase of the depth of water, under extreme sea condition, the depth of water be more than 4.0m when, wave substantially will not centering sand seabeach generate invade
Erosion.The erosion at 1 seabeach of Fig. 2 sections occurs mainly in offshore line 80m distances, and 2 beach gradient of Fig. 3 sections is larger, corrodes master
It is happened in offshore line 20m distances.
The specific implementation mode of the present invention is above are only, but the design concept of the present invention is not limited thereto, it is all to utilize this
Conceive the change for carrying out unsubstantiality to the present invention, the behavior for invading the scope of the present invention should all be belonged to.
Claims (2)
1. a kind of bank erosion amount prediction technique, includes the following steps：
1) breaker wave height H is calculatedb, Hb=0.39g0.2(TH0 2)0.4, g is acceleration of gravity, H0For deep-water weave wave height, T is wave
Period, h are that sandy beach is surged depth；
2) velocity of wave translation u at sandy beach is calculated0：
3) the corresponding wave number N of the different wave height of calculatingi；
4) it calculates wave and corrodes shear stress caused by beach face：
τw=0.5Fwρwu0 2
In formula, FwThe coefficient of friction resistance between flow and the soil body, ρwFor density of sea water；
5) sand anti-erosion critical shear stress is calculated：
In formula, dsFor sand median particle diameter, ρsFor sand grains densityFor the internal friction angle of sand；
6) erosion amount at sandy beach is calculated：
In formula, EsFor wave erosion amount, NiFor the corresponding wave number of i-th of wave height, n is wave height number, KsIt is by the agent of erosion with a
It is converted into the transformation ratio of erosion amount, Ks4.57mm/d, a is taken to take 1.0.
2. a kind of bank erosion amount prediction technique as described in claim 1, it is characterised in that：In step 1), according to wave
Monitoring station monitoring data determine deep water wave parameter during typhoon, including deep-water weave wave height H0, wave period T and sandy beach increase
Water depth.
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| CN108121888B (en) * | 2018-02-06 | 2021-06-01 | 水利部交通运输部国家能源局南京水利科学研究院 | Analysis method for cross section balance gradient of beach intertidal zone |
| CN108827871B (en) * | 2018-08-17 | 2020-11-10 | 河海大学 | Method for determining shear stress of sediment surface in tubular sediment erosion test device |
| CN109583639B (en) * | 2018-11-22 | 2021-04-30 | 华侨大学 | Method for predicting erosion amount of sea erosion cavern caused by waves carrying floating objects |
| CN114740550B (en) * | 2022-06-14 | 2022-08-26 | 广东海洋大学 | Intelligent recognition early warning method and system for continuous storm events |
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| CN102661741B (en) * | 2012-04-27 | 2015-03-11 | 中国科学院水利部成都山地灾害与环境研究所 | Method for monitoring topography and erosion amount of head of small-sized gully |
| JP6061499B2 (en) * | 2012-06-01 | 2017-01-18 | 株式会社荏原製作所 | Erosion prediction method and erosion prediction system, erosion characteristic database used for the prediction, and its construction method |
| CN104484710B (en) * | 2014-11-19 | 2017-10-20 | 华侨大学 | Soft seascarp sheer erosion amount Forecasting Methodology caused by a kind of wave action |
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