Method for predicting beach shoulder retreating amount in beach repair construction

Abstract

The invention discloses a beach repair construction beach shoulder retreat amount prediction method, and belongs to the technical field of beach repair, and the method comprises the steps: determining the sand filling particle size, the construction beach shoulder elevation, the construction beach shoulder width, the construction profile gradient and the sand filling amount according to beach repair design requirements; and calculating and predicting the retreat amount of the beach shoulder through a beach shoulder retreat amount calculation formula. According to the method, the beach shoulder retreating amount of beach repair construction can be quickly and accurately predicted.

Description

Technical Field

[0001] The invention relates to the technical field of beach restoration, and in particular to a method for predicting the retreat amount of a beach shoulder during beach restoration construction. Background Art

[0002] The destruction or disappearance of beaches has led to the reduction or loss of coastal disaster protection functions, ecological functions and tourism value. In order to restore the beach system, repair the beach landscape and improve the coastal ecological environment, engineering techniques such as beach maintenance are used to repair the damaged beaches.

[0003] In beach maintenance projects, the construction profile is often steeper than the natural equilibrium profile. As the beach gradually approaches equilibrium, the beach shoulder will retreat rapidly within a few months and transform into an equilibrium slope. Monitoring beach stability is an important means to evaluate the success of artificial beach technology. The prediction of beach shoulder retreat during beach restoration construction is of great significance for monitoring beach stability.

[0004] At present, the amount of excessive erosion from the beach shoulder to the equilibrium profile during beach restoration construction is estimated and predicted based on experience, which cannot meet the requirements of rapid and quantitative prediction.

[0005] In view of this, it is necessary to provide a new technical solution to solve the above problems. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a method for predicting the retreat amount of beach shoulders during beach restoration construction, which can quickly and accurately predict the retreat amount of beach shoulders during beach restoration construction.

[0007] A method for predicting the retreat of beach shoulders during beach restoration construction, comprising: Determine the sand replenishment particle size, construction beach shoulder elevation, construction beach shoulder width, construction beach surface slope and sand replenishment quantity according to beach restoration design requirements; The beach shoulder retreat amount is calculated and predicted using the beach shoulder retreat amount calculation formula.

[0008] Preferably, the calculation formula for the beach shoulder retreat amount is: ; In the formula, is the amount of beach shoulder retreat; The width of the construction shoulder; The width of the beach shoulder after the beach is balanced.

[0009] Preferably, the calculation formula for the width of the beach shoulder after the beach is balanced is: ; in, ; ; In the formula, is the scale parameter of natural sand profile; is the scale parameter of the filling sand profile; The height of the construction shoulder; It is the amount of sand thrown for single-width construction.

[0010] Preferably, the calculation formula of the filling sand profile scale parameter is: ; In the formula, is the settling velocity of the filling sand.

[0011] Preferably, the calculation formula of the natural sand profile scale parameter is: ; In the formula, is the settling velocity of natural sand.

[0012] Preferably, the calculation formula for the settling speed of filling sand and natural sand is: ; In the formula, is the median particle size of packing sand or natural sand; The density of fill sand or natural sand; The density of seawater in the sea area for beach restoration construction.

[0013] Compared with the prior art, this application has at least the following beneficial effects: 1. The present invention calculates and predicts the retreat of the beach shoulder through the beach shoulder retreat calculation formula, which can quickly and accurately predict the retreat of the beach shoulder during beach restoration construction. 2. The present invention calculates and predicts the beach shoulder retreat amount through the beach shoulder retreat amount calculation formula, simplifies the calculation process, does not require long-term data accumulation, and effectively reduces the workload and cost of on-site measurement.

[0014] 3. The beach shoulder retreat data calculated by the present invention is helpful to optimize the beach restoration plan and provide technical support for beach maintenance and restoration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall process of the present invention; Figure 2 It is a schematic diagram of the beach restoration construction section and the balanced beach section of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0017] like Figure 1 As shown, a method for predicting the retreat of beach shoulders during beach restoration construction includes the following steps: S1. Determine the sand replenishment particle size, construction beach shoulder elevation, construction beach shoulder width, construction beach slope and sand replenishment quantity according to the beach restoration design requirements.

[0018] Specifically, when determining the particle size of the replenishment sand, first calculate the average particle size of the natural sand of the coastline to be restored, and then use the average particle size of the replenishment sand as the design indicator based on the sediment compatibility requirements in the "Technical Guidelines for Beach Maintenance and Restoration" (HY / T 2525-2018). The basic principle for determining the average particle size of the replenishment sand is that the average particle size of the filling sand should be equal to or slightly coarser than the natural beach sand in the project area.

[0019] When determining the slope of the construction beach, the slope of the beach construction beach can be selected based on the particle size of the sand replenishment and the hydrodynamic conditions of the coastline to be repaired.

[0020] The construction beach shoulder elevation can be determined based on the 20-year return period high water level and design wave run-up in the Technical Guidelines for the Design of Beach Maintenance Sand Retaining Dikes (T / CAOE 72-2023).

[0021] The amount of sand replenishment is determined based on the actual water depth before construction and the water depth of the target area.

[0022] When carrying out beach restoration work, the sand replenishment method of adding sand to the dry beach to increase its width can be used.

[0023] S2. Calculate and predict the beach shoulder retreat amount using the beach shoulder retreat amount calculation formula.

[0024] The present invention can quickly and accurately predict the retreat amount of beach shoulders in beach restoration construction, and can better meet the actual needs of the project.

[0025] Specifically, the calculation formula for the beach shoulder retreat is: ; In the formula, is the amount of beach shoulder retreat; The width of the construction beach shoulder; The width of the beach shoulder after the beach is balanced.

[0026] The calculation formula for the width of the beach shoulder after the beach is balanced is: ; in, ; ; In the formula, is the scale parameter of natural sand profile; is the scale parameter of the filling sand profile; The height of the construction shoulder; The amount of sand thrown per unit width of construction refers to the volume of sand that needs to be thrown on the beach per unit width. It is usually used to evaluate and design the amount of sand placed in beach restoration or maintenance projects.

[0027] Furthermore, the calculation formula of the fill sand profile scale parameter is: ; The calculation formula of the natural sand profile scale parameter is: ; In the formula, is the settling velocity of the filling sand; is the settling velocity of natural sand.

[0028] When calculating the settling velocity of filling sand and natural sand, the following calculation formula can be used: ; In the formula, is the median particle size of packing sand or natural sand; The density of fill sand or natural sand; The density of seawater in the sea area for beach restoration construction.

[0029] In addition, when determining the width of the beach shoulder after the beach is balanced, the formula and To obtain the value, and then calculate the and The corresponding beach shoulder width result table is prepared, and the beach shoulder width trial calculation result table after beach balance is produced. The beach shoulder width after beach balance is obtained by looking up the table, thereby improving the calculation efficiency of the beach shoulder retreat. The beach shoulder width trial calculation result table after beach balance is shown in Table 1.

[0030] Table 1 Calculation results of beach shoulder width after beach balance

[0031] The profiles formed by different sand particle sizes will be different, which can quickly and accurately predict the amount of beach shoulder retreat involved in beach restoration construction, and better meet the actual needs of the project.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for predicting the retreat of beach shoulders during beach restoration construction, characterized in that: include: Determine the sand replenishment particle size, construction beach shoulder elevation, construction beach shoulder width, construction beach surface slope and sand replenishment quantity according to beach restoration design requirements; The beach shoulder retreat amount is calculated and predicted using the beach shoulder retreat amount calculation formula.

2. The method for predicting the retreat of beach shoulders during beach restoration construction according to claim 1, characterized in that: The calculation formula for the beach shoulder setback is: ； In the formula, is the amount of beach shoulder retreat; The width of the construction shoulder; The width of the beach shoulder after the beach is balanced.

3. The method for predicting the beach shoulder recession amount according to claim 2, characterized in that: The calculation formula for the width of the beach shoulder after the beach is balanced is: ； in, ； ； In the formula, is the scale parameter of natural sand profile; is the scale parameter of the filling sand profile; The height of the construction shoulder; It is the amount of sand thrown for single-width construction.

4. The method for predicting the beach shoulder recession amount according to claim 3, characterized in that: The calculation formula of the fill sand profile scale parameter is: ； In the formula, is the settling velocity of the filling sand.

5. The method for predicting the beach shoulder recession amount according to claim 4, characterized in that: The calculation formula of the natural sand profile scale parameter is: ； In the formula, is the settling velocity of natural sand.

6. The method for predicting the beach shoulder recession amount according to claim 5, characterized in that: The calculation formula for the settling velocity of filling sand and natural sand is: ； In the formula, is the median particle size of packing sand or natural sand; The density of fill sand or natural sand; The density of seawater in the sea area for beach restoration construction.

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