CN110795792A - Method for predicting riverbed deformation of strong turbulent fluctuation area of river channel caused by engineering construction - Google Patents
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Abstract
The invention discloses a method for predicting riverbed deformation of a strong turbulent fluctuation area of a riverway caused by engineering construction, which corrects the saturated sand-holding force of the strong turbulent fluctuation area by adopting the ratio lambda of the water turbulence intensity of each grid node of the strong turbulent fluctuation area caused by the engineering construction to the average turbulence intensity value of the whole riverway, so that the calculated riverbed deformation value is more in line with the actual condition and has better calculation precision.
Description
Technical Field
The invention relates to the technical field of river dynamics in the hydraulic engineering subject, in particular to a method for predicting riverbed deformation of a strong turbulent fluctuation area of a river channel caused by engineering construction.
Background
Riverbed deformation is a common evolution phenomenon of natural rivers, and can bring remarkable influence on flood control safety and wading engineering safety of the riverway, and accurate calculation of riverbed deformation is one of key technical problems which need to be solved for river regulation and protection.
However, the deformation of the riverbed of the natural river channel is influenced by incoming water and sand and a constraint boundary, the evolution mechanism is very complex, and the accurate calculation of the riverbed deformation value has a great challenge, particularly, the local strong turbulent water body area caused after the engineering construction has large scouring deformation amplitude, so that a general calculation method cannot be applied, and a mature and reliable calculation method does not exist at present.
Disclosure of Invention
The invention aims to provide a method for predicting riverbed deformation of a strong turbulent fluctuation area of a riverway caused by engineering construction.
In order to achieve the above purpose, with reference to fig. 1, the present invention provides a method for predicting riverbed deformation in a strong river channel turbulence area caused by engineering construction, wherein the method comprises:
s1: generating a computational grid of a riverbed deformation area according to the water turbulence intensity of each grid node of a strong turbulence area and the riverway whole body caused by engineering constructionBased on the energy consumption principle, the ratio lambda of the volume average turbulence intensity values is used for correcting the water flow saturation sand-holding capacity of each grid node in the strong turbulence area through the following formula to obtain the actual saturated sand-holding capacity S of each grid node in the strong turbulence areaTurbulent fluctuation：
STurbulent fluctuation＝λ×S*
In the formula: sTurbulent fluctuationSaturated sand-carrying force in a strong turbulent region; s*The sand-carrying force is the water flow saturation; lambda is the ratio of the turbulent intensity of the strong turbulent region to the overall average turbulent intensity value;
s2: calculating the value S according to the actual sand content of each grid node in the strong turbulence area and the saturated sand-holding force S of each grid node in the strong turbulence areaTurbulent fluctuationBased on the sedimentation flux conservation principle, the riverbed deformation value of the strong turbulence area is calculated according to the following formula:
in the formula: delta ZbIs the riverbed deformation value; gamma raysThe dry volume weight of the riverbed silt; the settling velocity of omega silt; s, STurbulent fluctuationActual sand content and saturated sand-carrying capacity in a strong turbulent region respectively; Δ t is the calculation time length.
In a further embodiment, in step S1, the obtaining process of the ratio λ between the turbulence intensity of the water flow at each grid node of the strong turbulence area and the average turbulence intensity value of the whole river channel caused by engineering construction includes:
s11: collecting basic data of a specified riverbed deformation area;
s12: generating a computational grid of the riverbed deformation area according to the collected basic data, and establishing a water flow sediment mathematical model of the riverbed deformation area;
s13: according to the boundary conditions of the strong turbulent fluctuation area of the river channel, based on the water-sand motion basic theory and the control equation, calculating the turbulent fluctuation intensity distribution of each grid node of the river channel by adopting a water-sand mathematical model, calculating the overall average turbulent fluctuation intensity value of the river channel according to the turbulent fluctuation intensity distribution, and calculating the ratio lambda of the turbulent fluctuation intensity of each grid node of the local strong turbulent fluctuation area to the overall average turbulent fluctuation intensity value caused by engineering construction.
In a further embodiment, the basic data of the specified riverbed deformation area includes riverway terrain, constraint boundaries, hydrological conditions and riverbed gradation.
In a further embodiment, the boundary conditions of the river channel strong turbulence area include river channel water level and flow rate.
In a further embodiment, the prediction method further comprises:
continuously calculating the water depth, the flow velocity and the actual sand content S of each grid node of the river channel by adopting a water flow sediment mathematical model, and then calculating the water flow saturation sand-carrying capacity S of each grid node of the river channel according to a water flow sand-carrying force formula*。
In a further embodiment, the prediction method further comprises:
s3: and determining the riverbed deformation risk level and the corresponding protection strategy by combining the riverbed deformation value of the strong turbulent fluctuation area obtained by calculation.
Compared with the prior art, the technical scheme of the invention has the following remarkable beneficial effects:
the ratio lambda of the turbulent intensity of water flow of each grid node in the strong turbulent fluctuation area to the average turbulent intensity value of the whole river channel, which is caused by engineering construction, is adopted to correct the saturated sand-carrying force in the strong turbulent fluctuation area, so that the calculated riverbed deformation value is more in line with the actual situation, and the calculation precision is better.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a flow chart of a method for predicting the deformation of a river bed in a strong river channel turbulence area caused by engineering construction according to the present invention.
Fig. 2 is a schematic diagram of the river channel strong turbulence zone caused by engineering construction according to the invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
Detailed description of the preferred embodiment
The invention provides an effective new prediction method for riverbed deformation of a strong turbulent fluctuation area of a riverway caused by engineering construction, and can provide technical support for riverway treatment and protection.
The method for predicting the riverbed deformation of the strong turbulent fluctuation area of the riverway caused by engineering construction comprises the following steps:
(1) collecting basic data of riverway terrain, constraint boundaries (including engineering construction), hydrological conditions (such as a flow change process, a water level change process, a flow velocity change process, a sand coming process and the like), riverbed gradation and the like of a riverbed deformation area to be calculated.
(2) And generating a calculation grid of the river channel of the calculation region according to the basic data, and establishing a water flow sediment mathematical model of the river channel of the calculation region.
(3) According to boundary conditions such as river channel water level, flow and the like, based on a water-sand motion basic theory and a control equation, calculating turbulence intensity distribution (including a strong turbulence area caused by engineering construction) of each grid node of a river channel by adopting a water-sand mathematical model, calculating an overall average turbulence intensity value of the river channel according to the turbulence intensity distribution, and calculating the ratio lambda (more than 1) of the turbulence intensity of each grid node of a local strong turbulence area caused by the engineering construction to the overall average turbulence intensity value.
(4) MiningContinuously calculating the water depth, the flow velocity and the actual sand content S of each grid node of the river channel by using a water flow sediment mathematical model, and then calculating the water flow saturation sediment-carrying capacity S of each grid node of the river channel according to a water flow sediment-carrying force formula*。
(5) Correcting the saturated sand-blasting force of the water flow of each grid node in the strong turbulence area through the following formula based on the energy consumption principle according to the ratio lambda of the turbulence intensity of the water flow of each grid node in the strong turbulence area to the overall average turbulence intensity value, thereby obtaining the saturated sand-blasting force of each grid node in the strong turbulence area which is consistent with the actual situation;
Sturbulent fluctuation＝λ×S*(1)
In the formula: sTurbulent fluctuationSaturated sand-carrying force in a strong turbulent region; s*The sand-carrying force is the water flow saturation; and lambda is the ratio of the turbulent intensity of the strong turbulent region to the overall average turbulent intensity value.
(6) Calculating the value S according to the actual sand content of each grid node and the saturated sand-carrying force S of each grid node in the strong turbulence areaTurbulent fluctuationBased on the principle of conservation of sedimentation flux, the deformation value of the riverbed in the strong turbulence area can be calculated according to the following formula:
in the formula: delta ZbIs the riverbed deformation value; gamma raysThe dry volume weight of the riverbed silt; the settling velocity of omega silt; s, STurbulent fluctuationActual sand content and saturated sand-carrying capacity in a strong turbulent region respectively; Δ t is the calculation time length.
Detailed description of the invention
With reference to fig. 2, the method for predicting the deformation of the riverbed in the strong turbulence area of the riverway caused by engineering construction comprises the following steps:
(1) and collecting the river channel basic data of the river bed deformation area to be calculated.
(2) And establishing a water flow sediment mathematical model in the calculation range shown in the figure 2 according to the basic data.
(3) Given the computational boundary, the upstream traffic is 100m3The downstream given water level is 16m, and the water-sand movement basic theory and the control equation are adoptedCalculating the turbulence intensity distribution of each grid node of the river channel by using a water flow sediment mathematical model, and calculating the integral average turbulence intensity value of the river channel to be 0.012m2/s2Then, local strong turbulence areas (the turbulence intensity is larger than the average value of 0.012 m) caused by engineering construction are calculated2/s2Region of (d) the ratio λ of the turbulence intensity of each grid node to the global average turbulence intensity value, where the maximum value λ on the grid node is 3.30, as will be further described below by taking this strongly turbulent region grid node as an example.
(4) Continuously calculating the water depth, the flow velocity and the actual sand content S of each grid node of the river channel by adopting a water flow sediment mathematical model, wherein the calculated value of the sand content S of the grid nodes in the strong turbulence area is 0.30kg/m3Then, the water flow saturation sand-carrying capacity S of each grid node of the river channel is calculated according to a water flow sand-carrying capacity formula*Wherein S of the above-mentioned grid nodes of strong turbulence zone*Is 0.40kg/m3。
(5) Correcting the saturated sand-holding force of the water flow of the nodes of the strong turbulent area grids according to the ratio lambda of the turbulent intensity of the water flow of the nodes of the strong turbulent area grids to the average turbulent intensity of the whole body based on the energy consumption principle by the following formula, thereby obtaining the saturated sand-holding force of the strong turbulent area grids which is consistent with the actual situation;
Sturbulent fluctuation＝λ×S*(1)
Namely the saturated sand-holding force S of the grid node of the strong turbulent fluctuation areaTurbulent fluctuationThe correction is 0.4kg/m3X 3.3＝1.32kg/m3。
(6) Calculating the value S according to the actual sand content of the grid nodes in the strong turbulent fluctuation area and the saturated sand-carrying force S in the strong turbulent fluctuation areaTurbulent fluctuation(ii) a Calculating the time delta t to be 10 days, namely 864000 s; the sediment sedimentation velocity omega is 0.0005 m/s; dry volume weight gamma of riverbed siltsIs 1200kg/m3(ii) a Based on the principle of conservation of settlement flux, the riverbed deformation value of the grid node in the strong turbulence area can be calculated according to the following formula:
namely the grid node of the strong turbulent fluctuation regionRiverbed deformation value delta ZbWhen the value is-0.367 m, the flushing is 0.367 m.
Correspondingly, if a conventional method is adopted, namely the saturated sand-carrying force of the strong turbulent fluctuation area is not corrected, the riverbed erosion deformation value is only 0.036m, the difference between the saturated sand-carrying force and the saturated sand-carrying force is large, and the actual riverbed erosion deformation value is about 0.4m, so that the calculation result of the calculation method disclosed by the invention is more consistent with the actual situation and has better calculation accuracy.
And evaluating the deformation condition of the riverbed according to the calculation result and adjusting a corresponding protection strategy, so that the method is closer to the actual condition and the actual requirement.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (6)
1. A method for predicting riverbed deformation of a strong turbulent fluctuation area of a riverway caused by engineering construction is characterized by comprising the following steps:
s1: generating a computational grid of a riverbed deformation area, correcting the water flow saturation sand-holding capacity of each grid node in a strong turbulence area through the following formula based on the energy consumption principle according to the ratio lambda of the water flow turbulence intensity of each grid node in the strong turbulence area to the overall average turbulence intensity value of the riverway caused by engineering construction, and obtaining the strong turbulence area which is consistent with the actual situationSaturated sand-holding force S of each grid node in regionTurbulent fluctuation：
STurbulent fluctuation＝λ×S*
In the formula: sTurbulent fluctuationSaturated sand-carrying force in a strong turbulent region; s*The sand-carrying force is the water flow saturation; lambda is the ratio of the turbulent intensity of the strong turbulent region to the overall average turbulent intensity value;
s2: calculating the value S according to the actual sand content of each grid node in the strong turbulence area and the saturated sand-holding force S of each grid node in the strong turbulence areaTurbulent fluctuationBased on the sedimentation flux conservation principle, the riverbed deformation value of the strong turbulence area is calculated according to the following formula:
in the formula: delta ZbIs the riverbed deformation value; gamma raysThe dry volume weight of the riverbed silt; the settling velocity of omega silt; s, STurbulent fluctuationActual sand content and saturated sand-carrying capacity in a strong turbulent region respectively; Δ t is the calculation time length.
2. The method for predicting riverbed deformation in a strong turbulence area of a river channel caused by engineering construction as claimed in claim 1, wherein in step S1, the process of obtaining the ratio λ between the water turbulence intensity of each grid node in the strong turbulence area caused by engineering construction and the average turbulence intensity value of the whole river channel comprises:
s11: collecting basic data of a specified riverbed deformation area;
s12: generating a computational grid of the riverbed deformation area according to the collected basic data, and establishing a water flow sediment mathematical model of the riverbed deformation area;
s13: according to the boundary conditions of the strong turbulent fluctuation area of the river channel, based on the water-sand motion basic theory and the control equation, calculating the turbulent fluctuation intensity distribution of each grid node of the river channel by adopting a water-sand mathematical model, calculating the overall average turbulent fluctuation intensity value of the river channel according to the turbulent fluctuation intensity distribution, and calculating the ratio lambda of the turbulent fluctuation intensity of each grid node of the local strong turbulent fluctuation area to the overall average turbulent fluctuation intensity value caused by engineering construction.
3. The method as claimed in claim 2, wherein the basic data of the specified riverbed deformation area includes riverway topography, constraint boundaries, hydrological conditions and riverbed gradations.
4. The method for predicting riverbed deformation of a river channel strong turbulence area caused by engineering construction as claimed in claim 2, wherein the boundary conditions of the river channel strong turbulence area comprise river channel water level and river channel flow rate.
5. The method for predicting riverbed deformation in a strong river channel turbulence area caused by engineering construction according to claim 2, wherein the method for predicting riverbed deformation in a strong river channel turbulence area further comprises:
adopting a water flow sediment mathematical model to continuously calculate the water depth, the flow velocity and the actual sand content S of each grid node of the river channel, and then calculating the water flow saturation sand-holding force S of each grid node of the river channel according to a water flow sand-holding force formula*。
6. The method for predicting riverbed deformation in a strong river channel turbulence area caused by engineering construction according to claim 1, wherein the method for predicting riverbed deformation in a strong river channel turbulence area further comprises:
s3: and determining the riverbed deformation risk level and the corresponding protection strategy by combining the riverbed deformation value of the strong turbulent fluctuation area obtained by calculation.
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