Method and device for determining lower-level sand mixing and blowing rate under wave action and electronic equipment

Abstract

The invention provides a method and a device for determining the sand blowing rate of lower-level sand preparation under the action of waves and electronic equipment. The method comprises the following steps: acquiring interaction factors, phase difference parameters and sediment settling velocities of different components in graded sand; and calculating the sand blowing rate of the graded sand based on the interaction factor, the phase difference parameter and the sediment settling velocity. According to the method, design calculation is carried out through the obtained parameters such as the interaction factor, the phase difference parameter and the sediment settling velocity, the sand blowing rate of each component in the graded sand and the sand blowing rate of the graded sand can be calculated, and in the process, the interaction among different components in the sand blowing rate can be reflected; compared with the time response required by the hydrodynamic condition, the sand blowing rate has an upper limit along with the increase of the flow intensity by considering the conservation of the sediment mass, so that the error estimation of the sand blowing rate of the graded sand is avoided, and the estimation precision of the sand blowing rate of the graded sand is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, and in particular to a method, a device and an electronic device for determining a sand raising rate of graded sand under wave action. Background Art

[0002] The periodic reciprocating wave motion makes the sediment movement in the coastal zone have the characteristics of non-constant, non-saturated and unbalanced transport.

[0003] Most of the sediment in nature is graded sand. The interaction between different components in graded sand will affect wave dissipation, sediment transport and beach evolution.

[0004] The dust blowing rate is the vertical sediment flux per unit bed surface per unit time.

[0005] At present, the sand raising rates widely used in engineering are all derived based on the theory of uniform sand steady flow, but they do not take into account the interaction between different components, phase difference and mass conservation. This will result in the sand raising rates obtained being unable to reflect the vertical exchange characteristics of different particle size components in graded sand, unable to reflect the mutual influence between different particle size components in graded sand, that is, the inhibition of coarse components on fine components, and the promotion of fine components on coarse components, and also unable to reflect the time response required for sediment movement relative to hydrodynamic conditions.

[0006] Therefore, it is very necessary to solve the problem that the existing sand raising rate determination method does not consider the interaction between different components, phase difference and mass conservation, resulting in low accuracy of the obtained sand raising rate. Summary of the invention

[0007] The present invention provides a method, device and electronic equipment for determining the sand raising rate of graded sand under the action of waves, so as to overcome the defect that the existing sand raising rate determination method does not consider the interaction, phase difference and mass conservation between different components, resulting in low accuracy of the obtained sand raising rate. The method can not only reflect the sorting process of components with different particle sizes in the graded sand, but also reflect the phase difference of sediment movement and mass conservation of sediment under the action of waves, thereby further improving the estimation accuracy of the sand raising rate of the graded sand.

[0008] On the one hand, the present invention provides a method for determining the sand raising rate of graded sand under the action of waves, comprising: obtaining the interaction factor, phase difference parameter and sediment settling velocity of different components in the graded sand; and calculating the sand raising rate of the graded sand based on the interaction factor, phase difference parameter and sediment settling velocity.

[0009] Furthermore, the sand raising rate of graded sand is calculated based on the interaction factor, phase difference parameter and sediment settling velocity, including: obtaining a wave friction factor; calculating vertical sediment flux and sinking flux of different components in the graded sand according to the interaction factor, phase difference parameter, sediment settling velocity and wave friction factor; and calculating the sand raising rate of the graded sand according to the vertical sediment flux and sinking flux.

[0010] Furthermore, the interaction factor is calculated by the following formula:

[0011]

[0012] Among them, η i is the interaction factor of component i in the graded sand, N is the number of sediment components in the graded sand, p j is the proportion of sediment in component j in graded sand, d i is the particle size of component i in the graded sand, d j The sediment particle size of component j in the graded sand, i and j are two different components in the graded sand.

[0013] Furthermore, the phase difference parameter is calculated by the following formula:

[0014]

[0015]

[0016] Among them, β i and φ i is the phase difference parameter of component i in graded sand, σ=2π / T is the frequency, Θ mi is the Sheartz number Θ of component i in graded sand i The maximum value, w i is the sediment settling velocity of the graded sand components, u m is the maximum value of the outer boundary layer velocity u, η i is the interaction factor of component i in graded sand, d i is the particle size of sediment of component i in the graded sand.

[0017] Furthermore, the sediment settling velocity is calculated by the following formula:

[0018]

[0019] Among them, d m is the arithmetic mean particle size of graded sand, d i is the particle size of component i in the graded sand, σ g is the geometric standard deviation of graded sand, s is the ratio of sediment density to water density, g is the acceleration of gravity, and ν is the kinematic viscosity coefficient of water.

[0020] Furthermore, the vertical sediment flux and sinking flux of different components in the graded sand are calculated by the following formulas:

[0021]

[0022]

[0023] Among them, Φ ti is the vertical sediment flux of component i in graded sand at time t, Φ di is the sinking flux of component i in graded sand at time t, Y is the vertical position, t is the time, η i is the interaction factor of component i in graded sand, C m is the maximum volume concentration, Δ i is the sediment content of component i in the graded sand, u m is the maximum velocity of the outer boundary layer, w i is the sediment settling velocity of component i in graded sand, f is the wave friction factor, β i and φ i is the phase difference parameter of component i in graded sand, u is the velocity of the outer boundary layer, σ is the frequency, s is the ratio of sediment to water density, and g is the gravitational acceleration.

[0024] Furthermore, the Schertz number θ i Calculated by the following formula:

[0025]

[0026] Among them, f is the wave friction factor, u is the velocity of the outer boundary layer, s is the ratio of sediment to water density, and g is the gravitational acceleration;

[0027] The wave friction factor is calculated by the following formula:

[0028]

[0029] Among them, A ac,at is the wave trajectory amplitude of the onshore acceleration section and the offshore acceleration section, T ac,at is the wave period of the onshore acceleration section and the offshore acceleration section, k N is the roughness height of the moving bed surface, T c,t is the wave period at the peak and trough, f ac,at is the wave friction factor in the onshore acceleration section and the offshore acceleration section, A dc,dt is the wave trajectory amplitude during the onshore deceleration stage and the offshore deceleration stage, T dc,dt is the wave period of the onshore deceleration section and the offshore deceleration section, f dc,dtis the wave friction factor in the onshore deceleration section and the offshore deceleration section.

[0030] In a second aspect, the present invention also provides a device for determining the sand raising rate of graded sand under the action of waves, comprising: a data acquisition module for acquiring the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand; and a sand raising rate calculation module for calculating the sand raising rate of the graded sand based on the interaction factors, phase difference parameters and sediment settling velocity.

[0031] In a third aspect, the present invention further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements a method for determining the sand raising rate of graded sand under the action of waves as described in any one of the above.

[0032] In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for determining the sand raising rate of graded sand under the action of waves as described in any one of the above.

[0033] The present invention provides a method for determining the sand raising rate of graded sand under the action of waves, by obtaining the interaction factor, phase difference parameter and sediment settling velocity of different components in the graded sand, and based on the interaction factor, phase difference parameter and sediment settling velocity, the sand raising rate of the graded sand is calculated. The method is designed and calculated by obtaining the interaction factor, phase difference parameter and sediment settling velocity and other parameters, and the sand raising rate of each component in the graded sand and the sand raising rate of the graded sand can be calculated. This process can not only reflect the interaction between different components in the sand raising rate, the time response of the sand raising rate relative to the hydrodynamic conditions, but also consider the conservation of sediment mass to make the sand raising rate have an upper limit as the flow intensity increases, avoid the wrong estimation of the sand raising rate of the graded sand, and further improve the estimation accuracy of the sand raising rate of the graded sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic flow chart of a method for determining the sand raising rate of graded sand under wave action provided by the present invention;

[0036] Figure 2 A schematic diagram of the variation of the wave friction factor and the Sheartz number provided by the present invention within a wave period;

[0037] Figure 3 A schematic diagram of the changes in the wave amplitude and the roughness height of the moving bed surface within a wave cycle provided by the present invention;

[0038] Figure 4 A schematic diagram of the change of the sediment amount, vertical sediment flux, sinking flux, sand raising rate of different components in the graded sand provided by the present invention and the graded sand sand raising rate within a wave cycle;

[0039] Figure 5 A schematic diagram of the changes in vertical sediment flux, sinking flux and sand-raising rate of different components in graded sand for removing the interactions between different components provided by the present invention within a wave cycle;

[0040] Figure 6 A schematic diagram of the structure of a device for determining the sand raising rate of graded sand under the action of waves provided by the present invention;

[0041] Figure 7 This is a schematic structural diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that the sand-raising rates currently widely used in engineering are derived based on the theory of uniform sand steady flow, which does not take into account the interaction between different components in graded sand, phase differences and mass conservation.

[0044] That is to say, the sand-raising rate calculated by the prior art cannot reflect the vertical exchange characteristics of different particle size components in graded sand. Specifically, it cannot reflect the mutual influence between different particle size components in graded sand, that is, the inhibition of coarse components on fine components and the promotion of fine components on coarse components. It also cannot reflect the time response required for sediment movement relative to hydrodynamic conditions, nor can it reflect the mass conservation of sediment.

[0045] So far, there is no reference result or method on how to calculate the sand blowing rate of graded sand under the action of waves.

[0046] In view of this, the present invention provides a method for determining the sand raising rate of graded sand under wave action, specifically, Figure 1 The flowchart of the method for determining the sand raising rate of graded sand under the action of waves provided by the present invention is shown.

[0047] like Figure 1 As shown, the method includes:

[0048] S110, obtaining the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand.

[0049] It can be understood that, in this embodiment, in order to calculate the sand raising rate of graded sand under the action of waves, it is necessary to first execute step S110, that is, to obtain the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand.

[0050] By obtaining the interaction factors and sediment settling velocities of different components in graded sand, the interactions between different components in graded sand are taken into consideration, so that the subsequently calculated graded sand raising rate can reflect the mutual influence between different components, reflecting the inhibition of coarse components on fine components, and the promotion of fine components on coarse components.

[0051] By obtaining the phase difference parameters of different components in graded sand, the mass conservation of sediment is taken into consideration, so that the subsequently calculated graded sand raising rate can reflect the time response required for sediment movement relative to hydrodynamic conditions. By considering mass conservation, the raising rate has an upper limit as the flow intensity increases.

[0052] Among them, the acquisition process (calculation formula) of the interaction factors, phase difference parameters and sediment settling velocity of different components in graded sand will be further expanded in subsequent embodiments.

[0053] S120, calculates the graded sand raising rate based on the interaction factor, phase difference parameter and sediment settling velocity.

[0054] It can be understood that, based on the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand obtained in step S110, step S120 can further calculate the graded sand raising rate according to a series of parameters obtained in step S110.

[0055] Specifically, since it is a calculation of the sand raising rate of graded sand under the action of waves, it is necessary to calculate the wave friction factor. On this basis, according to the interaction factor, phase difference parameter, sediment settling velocity and wave friction factor, the vertical sediment flux and sinking flux of different components in the graded sand can be further calculated. Thus, according to the vertical sediment flux and sinking flux, the sand raising rate of graded sand under the action of waves can be calculated.

[0056] Among them, the calculation of the wave friction factor and the calculation formula of the graded sand blowing rate will be further expanded in the subsequent embodiments.

[0057] It should be noted that the method for determining the sand-raising rate of graded sand under wave action provided in this embodiment is applied to conditions where graded sand exists near the shore, and is particularly suitable for application scenarios such as beach protection and shoreline reconstruction of graded sand coasts.

[0058] It should also be noted that the method for determining the sand-raising rate of graded sand under wave action provided in this embodiment can assist in determining the vertical exchange intensity of sediment in related issues such as nearshore sediment transport and beach evolution.

[0059] In this embodiment, the interaction factor, phase difference parameter and sediment settling velocity of different components in the graded sand are obtained, and the graded sand raising rate is calculated based on the interaction factor, phase difference parameter and sediment settling velocity. This method can calculate the raising rate of each component in the graded sand and the raising rate of the graded sand by designing and calculating the obtained interaction factor, phase difference parameter and sediment settling velocity parameters. This process can not only reflect the interaction between different components in the raising rate, the time response of the raising rate relative to the hydrodynamic conditions, but also consider the conservation of sediment mass to make the raising rate have an upper limit as the flow intensity increases, avoid the wrong estimation of the raising rate of the graded sand, and further improve the estimation accuracy of the raising rate of the graded sand.

[0060] On the basis of the above-mentioned embodiment, the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand are further obtained. This embodiment is carried out for the calculation process of a series of parameters.

[0061] For example, in a specific embodiment, the interaction factor of different components of graded sand is obtained. Specifically, the interaction factor can be calculated by the following formula:

[0062]

[0063] Among them, η i is the interaction factor of component i in the graded sand, N is the number of sediment components in the graded sand, p j is the proportion of sediment in component j in graded sand, d i is the particle size of component i in the graded sand, d j The sediment particle size of component j in the graded sand, i and j are two different components in the graded sand.

[0064] For another example, in another specific embodiment, the phase difference parameters of different components in the graded sand are obtained. Specifically, the phase difference parameters can be calculated by the following formula:

[0065]

[0066]

[0067] Among them, β i and φ i is the phase difference parameter of component i in graded sand, σ=2π / T is the frequency, Θ mi is the Sheartz number Θ of component i in graded sand i The maximum value, w i is the sediment settling velocity of the graded sand components, u m is the maximum value of the outer boundary layer velocity u, η i is the interaction factor of component i in graded sand, d i is the particle size of sediment of component i in the graded sand.

[0068] In formula (3), the Schertz number θ i It can be calculated by the following formula:

[0069]

[0070] Among them, f is the wave friction factor, u is the outer boundary layer velocity, s is the ratio of sediment to water density, and g is the gravitational acceleration.

[0071] In formula (4), the wave friction factor can be calculated by the following formula:

[0072]

[0073] Among them, A ac,at is the wave trajectory amplitude of the onshore acceleration section and the offshore acceleration section, T ac,at is the wave period of the onshore acceleration section and the offshore acceleration section, k N is the roughness height of the moving bed surface, T c,t is the wave period at the peak and trough, f ac,at is the wave friction factor in the onshore acceleration section and the offshore acceleration section, A dc,dt is the wave trajectory amplitude during the onshore deceleration stage and the offshore deceleration stage, T dc,dt is the wave period of the onshore deceleration section and the offshore deceleration section, f dc,dt is the wave friction factor in the onshore deceleration section and the offshore deceleration section.

[0074] According to formula (5), the subscripts c and t represent the peak and trough moments; the subscripts ac, at, dc and dt represent the onshore acceleration segment, the offshore acceleration segment, the onshore deceleration segment and the offshore deceleration segment.

[0075] In formula (5), the wave track amplitude A ac,at , A dc,dt It can be calculated by the following formula:

[0076]

[0077] Among them, u c,t is the outer boundary layer velocity at the peak and trough moments.

[0078] Roughness height of moving bed surface k N It can be obtained by the following calculation formula:

[0079]

[0080] For another example, in another specific embodiment, the sediment settling velocity of different components in the graded sand is obtained. Specifically, the sediment settling velocity can be calculated by the following formula:

[0081]

[0082] Among them, d m is the arithmetic mean particle size of graded sand, d i is the particle size of component i in the graded sand, σ g is the geometric standard deviation of graded sand, s is the ratio of sediment density to water density, g is the acceleration of gravity, and ν is the kinematic viscosity coefficient of water.

[0083] According to the above formulas (1)-(8), the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand can be calculated. Furthermore, according to the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand, the sand raising rate of the graded sand can be calculated.

[0084] In this embodiment, the interaction factor, phase difference parameter and sediment settling velocity of different components in the graded sand are obtained, and the graded sand raising rate is calculated based on the interaction factor, phase difference parameter and sediment settling velocity. This method can calculate the raising rate of each component in the graded sand and the raising rate of the graded sand by designing and calculating the obtained interaction factor, phase difference parameter and sediment settling velocity parameters. This process can not only reflect the interaction between different components in the raising rate, the time response of the raising rate relative to the hydrodynamic conditions, but also consider the conservation of sediment mass to make the raising rate have an upper limit as the flow intensity increases, avoid the wrong estimation of the raising rate of the graded sand, and further improve the estimation accuracy of the raising rate of the graded sand.

[0085] On the basis of the above embodiments, further, based on the interaction factor, phase difference parameter and sediment settling velocity, the graded sand raising rate is calculated, including: obtaining the wave friction factor; calculating the vertical sediment flux and sinking flux of different components in the graded sand according to the interaction factor, phase difference parameter, sediment settling velocity and wave friction factor; calculating the graded sand raising rate according to the vertical sediment flux and sinking flux.

[0086] It can be understood that the wave friction factor can be obtained by calculation according to the above formula (5).

[0087] After calculating the interaction factors, phase difference parameters, sediment settling velocity, and wave friction factors of different components in the graded sand, the sediment amounts of different components in the graded sand, Δ i .

[0088] Specifically, the amount of sediment Δ of component i in the graded sand i It can be calculated by the following formula:

[0089]

[0090] Among them, σ=2π / T is frequency, t is time, β i and φ i is the phase difference parameter of component i in graded sand, Θ i is the Sheartz number of component i in the graded sand, Θ mi is the Sheartz number Θ of component i in graded sand i The maximum value of u m is the maximum value of the outer boundary layer velocity u, w i is the sediment settling velocity of the components in the graded sand, d i is the particle size of sediment of component i in the graded sand.

[0091] Calculate the sediment content of component i in the graded sand i Afterwards, the vertical sediment flux and sinking flux of different components in the graded sand were calculated according to the interaction factors, phase difference parameters, sediment settling velocity, wave friction factor and sediment amount of different components in the graded sand.

[0092] Specifically, the vertical sediment flux and sinking flux of different components in graded sand can be calculated by the following formulas:

[0093]

[0094]

[0095] Among them, Φ ti is the vertical sediment flux of component i in graded sand, Φ di is the sinking flux of component i in graded sand, Y is the vertical position, t is the time, η i is the interaction factor of component i in graded sand, C m is the maximum volume concentration, Δ i is the sediment content of component i in the graded sand, u m is the maximum velocity of the outer boundary layer, wi is the sediment settling velocity of component i in graded sand, f is the wave friction factor, β i and φ i is the phase difference parameter of component i in graded sand, u is the velocity of the outer boundary layer, σ is the frequency, s is the ratio of sediment to water density, and g is the gravitational acceleration.

[0096] Finally, the sand raising rate Φ of the graded sand components is calculated based on the vertical sediment flux and sinking flux. i .

[0097] Φ i (Y,t)=Φ ti (Y,t)-Φ di (Y,t) (12)

[0098] Among them, Φ ti is the vertical sediment flux of the graded sand components, Φ di is the sinking flux of components in graded sand.

[0099] Furthermore, according to the dust raising rate Φ of different components in the graded sand i , calculate the sand raising rate Φ of graded sand under wave action.

[0100] Specifically, the sand blowing rate Φ of graded sand under wave action can be calculated by the following formula:

[0101]

[0102] Among them, p i is the proportion of sediment in component i in the graded sand, and N is the number of sediment components in the graded sand.

[0103] In this embodiment, the sand raising rate of graded sand is calculated based on the obtained interaction factors, phase difference parameters and sediment settling velocity. This method can calculate the sand raising rate of each component in the graded sand and the sand raising rate of the graded sand by designing and calculating the obtained interaction factors, phase difference parameters and sediment settling velocity and other parameters. This process can not only reflect the interaction between different components in the sand raising rate, the time response of the sand raising rate relative to the hydrodynamic conditions, but also consider the conservation of sediment mass to make the sand raising rate have an upper limit as the flow intensity increases, avoid the wrong estimation of the sand raising rate of the graded sand, and further improve the estimation accuracy of the sand raising rate of the graded sand.

[0104] In addition, in a specific embodiment, an application embodiment of a method for determining the sand raising rate of graded sand under the action of waves is also provided.

[0105] Expanded, given a standard atmospheric pressure, 20°C water temperature, T = 5s, N = 2, d1 = 0.15mm, d2 = 0.51mm, p1 = 0.5, p2 = 0.5, dm =0.33mm,σ g =2.29, s=2.65, g=9.8m / s2, ν=1.0*10-6m2 / s, using the second-order Strokes reciprocating flow velocity, that is, u(t)=1.2cos[2π(t / T-0.214)]+0.3cos[4π(t / T-0.214)].

[0106] First, calculate the interaction factor η corresponding to d1 and d2 i and sediment settling velocity w i .

[0107] Specifically, according to the above formula (1), η1=0.71, η2=1.40; according to the above formula (8), w1=0.018m / s, w2=0.059m / s.

[0108] Then, the Sheartz number θ corresponding to the wave friction factor f, d1 and d2 is calculated i , wave track amplitude A and moving bed surface roughness height k N .

[0109] Specifically, according to the above formulas (5)-(7), we can know f, Θ i , A and k N The calculation result of .

[0110] Expanded, Figure 2 The schematic diagram of the variation of the wave friction factor and the Sheartz number provided by the present invention within the wave period is shown, and Figure 3 The figure shows the change of the wave amplitude and the roughness height of the moving bed surface provided by the present invention within the wave cycle.

[0111] exist Figure 2 where t / T is the dimensionless time, Θ1 and Θ2 are the Schertz numbers corresponding to d1 and d2, respectively.

[0112] exist Figure 3 Medium, A / A m is the dimensionless wave orbit amplitude, k / k Nm is the dimensionless roughness height of the moving bed surface.

[0113] Then, calculate the phase difference parameter β corresponding to d1 and d2 i and φ i .

[0114] Specifically, according to the above formulas (2)-(3), it can be calculated that β1=1.04, β2=2.03, φ1=0.51, and φ2=0.20.

[0115] Next, calculate the sediment volume Δ corresponding to d1 and d2i .

[0116] Specifically, according to the above formula (9), we can get Δ i The calculation result of .

[0117] Expanded, Figure 4 The diagram shows the sediment amount of different components in the graded sand provided by the present invention, the vertical sediment flux, the sinking flux, the sand raising rate, and the change of the graded sand sand raising rate within the wave cycle.

[0118] Finally, calculate the vertical sediment flux Φ corresponding to d1 and d2 ti , sinking flux Φ di 、Sand blowing rate Φ i And the graded sand blowing rate Φ.

[0119] Specifically, according to the above formulas (10)-(13), the vertical sediment flux Φ can be obtained: ti , sinking flux Φ di 、Sand blowing rate Φ i As well as the calculation results of the graded sand blowing rate Φ, please refer to the above Figure 4 .

[0120] exist Figure 4 In the equation, Δ1 and Δ2 are the sediment amounts corresponding to d1 and d2 respectively, Φ t1 , Φ d1 and Φ1 are the vertical sediment flux, sinking flux and sand raising rate corresponding to d1, respectively. t2 , Φ d2 and Φ2 are the vertical sediment flux, sinking flux and sand raising rate corresponding to d2, respectively, and Φ is the sand raising rate of graded sand.

[0121] in addition, Figure 5 The schematic diagram shows the changes in vertical sediment flux, sinking flux and sand raising rate of different components in graded sand for removing the interaction between different components provided by the present invention within a wave cycle.

[0122] By comparison Figure 4 and Figure 5 It can be seen that due to the interaction between different components in the graded sand, the vertical sediment flux, sinking flux and sand raising rate of the fine component decreased, while the vertical sediment flux, sinking flux and sand raising rate of the coarse component increased.

[0123] It should be emphasized that, by adopting the method for determining the sand raising rate of graded sand under wave action provided by the present invention, the sand raising rate comprehensively considers the interaction between different components in the graded sand, the phase difference and the conservation of mass.

[0124] Compared with the existing method for determining the sand raising rate of graded sand, the present invention has the following advantages:

[0125] In one aspect, the present invention is able to calculate the vertical fluxes of different components in graded sand.

[0126] That is, the present invention can calculate the vertical sediment flux, sinking flux and sand raising rate of each component in the graded sand and the graded sand sand raising rate, and then can accurately predict the vertical exchange characteristics of sediments of different particle sizes on the graded sand coast under the action of waves.

[0127] On the other hand, the present invention can embody the sorting process of different particle size components in graded sand.

[0128] That is, the present invention can reflect the mutual influence between different components by considering the interaction between different components, and reflect the inhibition of coarse components on fine components and the promotion of fine components on coarse components.

[0129] Due to the interaction between different components, the vertical sediment flux, sinking flux and sand-raising rate of the fine component will decrease, while the vertical sediment flux, sinking flux and sand-raising rate of the coarse component will increase.

[0130] In addition, the present invention can also reflect the phase difference of sediment movement under the action of waves and the mass conservation of sediment.

[0131] The present invention can reflect the time response required for sediment movement relative to hydrodynamic conditions by calculating the phase difference parameter, and by considering the conservation of mass, the sand raising rate has an upper limit as the flow intensity increases.

[0132] Figure 6 The schematic diagram of the structure of the device for determining the sand raising rate of graded sand under the action of waves provided by the present invention is shown.

[0133] like Figure 6 As shown, the device includes: a data acquisition module 610, which is used to obtain the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand; a sand raising rate calculation module 620, which is used to calculate the sand raising rate of the graded sand based on the interaction factors, phase difference parameters and sediment settling velocity.

[0134] In this embodiment, the interaction factors, phase difference parameters and sediment settling speed of different components in the graded sand are obtained by the data acquisition module 610, and the sand raising rate calculation module 620 calculates the graded sand raising rate based on the interaction factors, phase difference parameters and sediment settling speed. The device is designed and calculated by the acquired interaction factors, phase difference parameters and sediment settling speed parameters, and can calculate the sand raising rate of each component in the graded sand and the sand raising rate of the graded sand. This process can not only reflect the interaction between different components in the sand raising rate, the time response of the sand raising rate relative to the hydrodynamic conditions, but also consider the conservation of sediment mass to make the sand raising rate have an upper limit as the flow intensity increases, avoid the wrong estimation of the graded sand raising rate, and further improve the estimation accuracy of the graded sand raising rate.

[0135] It should be noted that the device for determining the sand raising rate of graded sand under the action of waves provided in this embodiment and the method for determining the sand raising rate of graded sand under the action of waves described above can correspond to each other and will not be repeated here.

[0136] Figure 7 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 7 As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730 and a communication bus 740, wherein the processor 710, the communication interface 720 and the memory 730 communicate with each other through the communication bus 740. The processor 710 may call the logic instructions in the memory 730 to execute a method for determining the sand raising rate of graded sand under the action of waves, the method comprising: obtaining the interaction factor, phase difference parameter and sediment settling velocity of different components in the graded sand; and calculating the sand raising rate of the graded sand based on the interaction factor, phase difference parameter and sediment settling velocity.

[0137] In addition, the logic instructions in the above-mentioned memory 730 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0138] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the method for determining the sand raising rate of graded sand under the action of waves provided by the above-mentioned methods. The method includes: obtaining the interaction factors, phase difference parameters and sediment settling velocity of different components in the graded sand; based on the interaction factors, phase difference parameters and sediment settling velocity, calculating the sand raising rate of the graded sand.

[0139] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0140] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the sand raising rate of graded sand under wave action, characterized in that: include: Obtain the interaction factors, phase difference parameters and sediment settling velocity of different components in graded sand; Based on the interaction factor, phase difference parameter and sediment settling velocity, the graded sand raising rate is calculated.

2. The method for determining the sand raising rate of graded sand under wave action according to claim 1, characterized in that: The step of calculating the graded sand raising rate based on the interaction factor, the phase difference parameter and the sediment settling velocity comprises: Get the wave friction factor; According to the interaction factor, phase difference parameter, sediment settling velocity and wave friction factor, vertical sediment flux and sinking flux of different components in graded sand are calculated; The graded sand raising rate is calculated based on the vertical sediment flux and the sinking flux.

3. The method for determining the sand raising rate of graded sand under wave action according to claim 1, characterized in that: The interaction factor is calculated by the following formula: Among them, η i is the interaction factor of component i in the graded sand, N is the number of sediment components in the graded sand, p j is the proportion of sediment in component j in graded sand, d i is the particle size of component i in the graded sand, d j The sediment particle size of component j in the graded sand, i and j are two different components in the graded sand.

4. The method for determining the sand raising rate of graded sand under wave action according to claim 1, characterized in that: The phase difference parameter is calculated by the following formula: Among them, β i and φ i is the phase difference parameter of component i in graded sand, σ=2π / T is the frequency, Θ mi is the Sheartz number Θ of component i in graded sand i The maximum value, w i is the sediment settling velocity of component i in graded sand, u m is the maximum value of the outer boundary layer velocity u, η i is the interaction factor of component i in graded sand, d i is the particle size of sediment of component i in the graded sand.

5. The method for determining the sand raising rate of graded sand under wave action according to claim 1, characterized in that: The sediment settling velocity is calculated by the following formula: Among them, d m is the arithmetic mean particle size of graded sand, d i is the particle size of component i in the graded sand, σ g is the geometric standard deviation of graded sand, s is the ratio of sediment density to water density, g is the acceleration of gravity, and ν is the kinematic viscosity coefficient of water.

6. The method for determining the sand raising rate of graded sand under wave action according to claim 2, characterized in that: The vertical sediment flux and sinking flux of different components in the graded sand are calculated by the following formulas: Among them, Φ ti is the vertical sediment flux of component i in graded sand at time t, Φ di is the sinking flux of component i in graded sand at time t, Y is the vertical position, t is the time, η i is the interaction factor of component i in graded sand, C m is the maximum volume concentration, Δ i is the sediment content of component i in the graded sand, u m is the maximum velocity of the outer boundary layer, w i is the sediment settling velocity of component i in graded sand, f is the wave friction factor, β i and φ i is the phase difference parameter of component i in graded sand, u is the velocity of the outer boundary layer, σ is the frequency, s is the ratio of sediment to water density, and g is the gravitational acceleration.

7. The method for determining the sand raising rate of graded sand under wave action according to claim 4, characterized in that: The Scherz number θ i Calculated by the following formula: Among them, f is the wave friction factor, u is the velocity of the outer boundary layer, s is the ratio of sediment to water density, and g is the gravitational acceleration; The wave friction factor is calculated by the following formula: Among them, A ac,at is the wave trajectory amplitude of the onshore acceleration section and the offshore acceleration section, T ac,at is the wave period of the onshore acceleration section and the offshore acceleration section, k N is the roughness height of the moving bed surface, T c,t is the wave period at the peak and trough, f ac,at is the wave friction factor in the onshore acceleration section and the offshore acceleration section, A dc,dt is the wave trajectory amplitude during the onshore deceleration stage and the offshore deceleration stage, T dc,dt is the wave period of the onshore deceleration section and the offshore deceleration section, f dc,dt is the wave friction factor in the onshore deceleration section and the offshore deceleration section.

8. A device for determining the sand raising rate of graded sand under wave action, characterized in that: include: Data acquisition module, used to obtain the interaction factors, phase difference parameters and sediment settling velocity of different components in graded sand; The sand raising rate calculation module is used to calculate the graded sand raising rate based on the interaction factor, phase difference parameter and sediment settling velocity.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for determining the sand raising rate of graded sand under the action of waves as described in any one of claims 1 to 7 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining the sand raising rate of graded sand under the action of waves as claimed in any one of claims 1 to 7 is implemented.

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