CN110193218B - Precipitation tank scale control method and device of rainfall flood resource underground water recharging system - Google Patents
Precipitation tank scale control method and device of rainfall flood resource underground water recharging system Download PDFInfo
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Abstract
The embodiment of the invention discloses a sedimentation tank scale control method and a sedimentation tank scale control device of a rainfall flood resource groundwater recharging system, wherein the sedimentation tank scale control method comprises the following steps: obtaining rated recharging flow and recharging frequency of a recharging water source; determining the upper limit value and the lower limit value of the interception settling velocity of the sedimentation tank, and dispersing a plurality of discrete interception settling velocities; acquiring a recharging project service life value corresponding to each discrete interception sinking speed; generating a relation graph of the interception sinking speed and the service life of the recharging project according to all the discrete interception sinking speeds and all the recharging project service life values; and determining the optimal design interception settling velocity of the sedimentation tank according to the actual life value of the recharging project and the relation graph of the interception settling velocity and the project life. The precipitation tank scale control method and the precipitation tank scale control device of the rainfall flood resource groundwater recharge system disclosed by the embodiment of the invention can not only provide ideas for the optimization design of groundwater recharge pretreatment engineering, but also can evaluate the service life of recharge engineering, and improve the operation efficiency and the economic benefit of the recharge engineering.
Description
Technical Field
The embodiment of the invention relates to the technical field of water conservancy projects, in particular to a sedimentation tank scale control method and a sedimentation tank scale control device for a rainwater flood resource underground water replenishing system.
Background
The artificial groundwater seepage and storage recharge is to recharge and replenish groundwater by using a surface water source and artificially adjust the supplement and drainage relation of the groundwater, so that the continuous decline of the groundwater level is prevented, the fresh water supplement of groundwater is increased, the groundwater level is stabilized, the rain and flood in a flood season and the surplus water amount of transregional water regulation can be fully utilized, and the artificial groundwater seepage and storage recharge can be used for relieving and repairing ground settlement, seawater intrusion, groundwater pollution and the like under certain conditions. In the manual recharging process, suspended particles are blocked, which is the primary factor for restricting the recharging efficiency and influencing the service life of the recharging project. The reasonable pretreatment for removing the suspended particles in the recharge water source can control or reduce the blockage degree, thereby improving the infiltration efficiency of the recharge project and prolonging the service life of the recharge project.
In the prior art, the design and research of a sedimentation tank mainly aims at a drinking water treatment process and is also used for the pretreatment of water quality of irrigation systems such as micro-drip irrigation and the like. In recent years, the concept of underground reservoirs is continuously mentioned, and the underground space is used for regulating and storing surface water to optimize the supply and demand relationship of surface water resources, so that the function of the underground reservoir is self evident, and when the content of suspended matters in the surface water resources is high, the filtering pretreatment is also needed. The precipitation and filtration are also necessary links for the seepage, storage and utilization of rain flood resources.
However, the design of the sedimentation tank is rarely studied, and the reason for this is mainly that the relationship between the occurrence of blockage and the content and distribution of suspended particles is not easily determined quantitatively. The scale of the sedimentation tank depends on economic indexes such as floor area, dredging workload of the sedimentation tank and the like, and the groundwater recharging project depends on benefit indexes such as recharging water quantity, recharging efficiency, normal service life of the project and the like. How to scientifically design the scale of the sedimentation tank and improve the efficiency and the benefit of a rainwater flood resource groundwater recharge system is a technical problem to be solved urgently.
Disclosure of Invention
Therefore, the embodiment of the invention provides a sedimentation tank scale control method and a sedimentation tank scale control device for a rainfall flood resource groundwater recharge system, and aims to solve the technical problems of low operation efficiency and poor economic benefit of recharge engineering in the prior art due to the fact that the relation between the occurrence of sedimentation tank blockage and the content and distribution of suspended particles is not easy to quantify.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to a first aspect of the embodiment of the invention, a sedimentation tank scale control method of a rainfall flood resource groundwater recharging system is provided, which comprises the following steps:
obtaining rated recharging flow and recharging frequency of a recharging water source;
determining an upper limit value and a lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
separating a plurality of discrete interception sinking speeds from the upper limit value and the lower limit value of the interception sinking speed;
obtaining the total recharge water amount corresponding to each discrete interception settling speed;
determining a recharging engineering life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of a recharging water source;
generating a relation graph of the interception sinking speed and the service life of the recharging project according to all the discrete interception sinking speeds and all the recharging project service life values;
and determining the optimal design interception settling velocity of the sedimentation tank according to the actual life value of the recharging project and the relation graph of the interception settling velocity and the project life.
Further, the obtaining of the total recharge water amount corresponding to each discrete interception settling velocity specifically includes:
aiming at the target discrete interception settling velocity, calculating the concentration and the particle size distribution of suspended particles of recharge source water after the recharge source water is settled in a settling pond according to a still water settling method;
dispersing a plurality of settling periods in time, calculating specific sedimentation amount of suspended particles, a filtration coefficient and change of an aquifer permeability coefficient period by period based on an initial filtration coefficient, and taking the recharge amount when the aquifer permeability coefficient is smaller than a set threshold value as the recharge total water amount corresponding to the target discrete interception settling velocity.
Further, the obtaining of the rated recharging flow rate and recharging frequency of the recharging water source specifically includes:
acquiring the water supply condition information of a back-supplementing water source, wherein the water supply condition information of the back-supplementing water source comprises the water supply process, the content and composition detection information of suspended particles;
and determining the rated recharging flow rate, recharging frequency, the average concentration of suspended particles in the recharging water source and the particle size distribution of the suspended particles according to the water supply process of the water source, the content of the suspended particles and the composition detection data.
Further, the determining of the upper limit value and the lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the requirement of the rated recharge water quantity specifically comprises:
acquiring the maximum value and the minimum value of the construction area of the sedimentation tank;
calculating an interception settling velocity upper limit value and an interception settling velocity lower limit value by utilizing a preset interception settling velocity formula according to the maximum value and the minimum value of the construction area of the sedimentation tank and the rated recharge water quantity requirement;
the preset interception sinking rate formula is as follows:
wherein, U0For intercepting the sinking velocity, k is the turbulent flow correction coefficient, QRated valueAnd A is the construction area of the sedimentation tank for the rated reinjection water quantity requirement.
According to a second aspect of the embodiments of the present invention, there is provided a sedimentation tank scale control device for a rainwater flood resource groundwater recharge system, including:
the acquisition module is used for acquiring the rated recharging flow and recharging frequency of the recharging water source;
the interception settling velocity upper and lower limit determining module is used for determining an interception settling velocity upper limit value and an interception settling velocity lower limit value of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
the discrete module is used for separating a plurality of discrete interception sinking speeds from the interval between the interception sinking speed upper limit and the interception sinking speed lower limit;
the calculation module is used for acquiring the total recharge water amount corresponding to each discrete interception settling velocity;
the determining module is used for determining a recharging engineering life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of the recharging water source;
the generating module is used for generating a relation graph of the interception sinking speed and the recharging project life according to all the discrete interception sinking speeds and all the recharging project life values;
and the control module is used for determining the optimal design interception settling velocity of the sedimentation tank according to the actual service life value of the recharging project and by combining the interception settling velocity and the project service life relation graph.
Further, the calculation module is specifically configured to:
aiming at the target discrete interception settling velocity, calculating the concentration and the particle size distribution of suspended particles of recharge source water after the recharge source water is settled in a settling pond according to a still water settling method;
dispersing a plurality of settling periods in time, calculating specific sedimentation amount of suspended particles, a filtration coefficient and change of an aquifer permeability coefficient period by period based on an initial filtration coefficient, and taking the recharge amount when the aquifer permeability coefficient is smaller than a set threshold value as the recharge total water amount corresponding to the target discrete interception settling velocity.
Further, the obtaining module is specifically configured to:
acquiring the water supply condition information of a back-supplementing water source, wherein the water supply condition information of the back-supplementing water source comprises the water supply process, the content and composition detection information of suspended particles;
and determining the rated recharging flow rate, recharging frequency, the average concentration of suspended particles in the recharging water source and the particle size distribution of the suspended particles according to the water supply process of the water source, the content of the suspended particles and the composition detection data.
Further, the interception settling velocity upper and lower limit determining module is specifically configured to:
acquiring the maximum value and the minimum value of the construction area of the sedimentation tank;
calculating an interception settling velocity upper limit value and an interception settling velocity lower limit value by utilizing a preset interception settling velocity formula according to the maximum value and the minimum value of the construction area of the sedimentation tank and the rated recharge water quantity requirement;
the preset interception sinking rate formula is as follows:
wherein, U0For intercepting the sinking velocity, k is the turbulent flow correction coefficient, QRated valueAnd A is the construction area of the sedimentation tank for the rated reinjection water quantity requirement.
In another aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above method when executing the computer program.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the above method.
The embodiment of the invention has the following advantages:
the embodiment of the invention discloses a sedimentation tank scale control method and a sedimentation tank scale control device for a rainfall flood resource underground water replenishing system, and provides an optimization design method for an underground water replenishing sedimentation tank aiming at the defects of the current underground water replenishing water source suspended particle pretreatment process engineering design method. In addition, the idea constructed by the method can provide an idea for the optimization design of the groundwater recharge pretreatment project, and meanwhile, the service life of the recharge project can be evaluated, so that the operation efficiency and the economic benefit of the recharge project are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic diagram of a sedimentation tank scale control method of a rainfall flood resource groundwater recharging system according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the fitting result of the characteristic length of the filter layer of the filter material with specific surface area provided by the embodiment of the present invention;
FIG. 3 is a diagram illustrating a standard capture rate function according to an embodiment of the present invention;
FIG. 4 is a flow chart of a sedimentation tank scale calculation method according to an embodiment of the present invention;
fig. 5 is a schematic view of a sedimentation tank scale control device of a rainfall flood resource groundwater recharging system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention mainly relates to the design problem of the scale of the pre-treatment engineering for utilizing the rainfall flood resource containing suspended particles, and aims at the blockage problem in the current engineering use processes of seepage storage utilization, artificial recharge and the like of the rainfall flood resource.
Fig. 1 is a schematic diagram of a sedimentation tank scale control method of a rainwater flood resource groundwater recharge system according to an embodiment of the present invention, and as shown in fig. 1, the embodiment of the present invention provides a sedimentation tank scale control method of a rainwater flood resource groundwater recharge system, which includes:
s101, obtaining rated recharging flow and recharging frequency of a recharging water source;
step S102, determining an upper limit value and a lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
s103, separating a plurality of discrete interception sinking speeds from the upper limit value and the lower limit value of the interception sinking speed;
s104, acquiring the total recharge water amount corresponding to each discrete interception settling speed;
step S105, determining a recharging project life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of a recharging water source;
s106, generating a relation graph of the interception sinking speed and the recharging project life according to all the discrete interception sinking speeds and all the recharging project life values;
and S107, determining the optimal design interception settling velocity of the sedimentation tank according to the actual life value of the recharging project and by combining the interception settling velocity and the project life relation graph.
Based on any of the above embodiments, further, the obtaining of the total recharge water amount corresponding to each discrete interception settling velocity specifically includes:
aiming at the target discrete interception settling velocity, calculating the concentration and the particle size distribution of suspended particles of recharge source water after the recharge source water is settled in a settling pond according to a still water settling method;
dispersing a plurality of settling periods in time, calculating specific sedimentation amount of suspended particles, a filtration coefficient and change of an aquifer permeability coefficient period by period based on an initial filtration coefficient, and taking the recharge amount when the aquifer permeability coefficient is smaller than a set threshold value as the recharge total water amount corresponding to the target discrete interception settling velocity.
Based on any one of the above embodiments, further, the obtaining of the rated recharging flow rate and recharging frequency of the recharging water source specifically includes:
acquiring the water supply condition information of a back-supplementing water source, wherein the water supply condition information of the back-supplementing water source comprises the water supply process, the content and composition detection information of suspended particles;
and determining the rated recharging flow rate, recharging frequency, the average concentration of suspended particles in the recharging water source and the particle size distribution of the suspended particles according to the water supply process of the water source, the content of the suspended particles and the composition detection data.
Based on any one of the above embodiments, further, determining an upper limit value and a lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the requirement of the rated recharge water amount specifically includes:
acquiring the maximum value and the minimum value of the construction area of the sedimentation tank;
calculating an interception settling velocity upper limit value and an interception settling velocity lower limit value by utilizing a preset interception settling velocity formula according to the maximum value and the minimum value of the construction area of the sedimentation tank and the rated recharge water quantity requirement;
the preset interception sinking rate formula is as follows:
wherein, U0For intercepting the sinking velocity, k is the turbulent flow correction coefficient, QRated valueAnd A is the construction area of the sedimentation tank for the rated reinjection water quantity requirement.
The embodiment of the invention provides a calculation method for evaluating the relationship between the scale of a sedimentation tank and the service life of groundwater recharge engineering, and before introducing specific calculation steps, the following concepts need to be emphasized firstly:
(1) the groundwater recharge and underground utilization of rain and flood resources containing suspended particles inevitably leads to the reduction of the permeability coefficient of the aquifer, the formation of blockage and the failure of natural recovery, and the process of the occurrence of the blockage is related to the content and the composition of the suspended particles in the recharge water source.
(2) Numerous studies have shown that the probability of adsorption of suspended particles of different particle size by the aquifer is different, and that when the suspended particles are smaller (<50 μm), the adsorption ratio is not monotonic with respect to the suspended particle size, i.e. the probability of adsorption of relatively smaller suspended particles by the aquifer may be greater, due to mesoscopic forces such as van der waals forces and electric double layer forces.
(3) According to the theory of the still water sedimentation method, the smaller the interception settling velocity of the sedimentation tank is, the higher the removal efficiency of suspended particles is, and the removal rate of the suspended particles with different particle sizes is in positive correlation with the particle sizes of the suspended particles, namely, the larger the particle size of the suspended particles is, the higher the removal rate is, but the smaller the interception settling velocity means the lower water yield, if the water yield is required to be unchanged, the scale of the sedimentation tank needs to be enlarged, the desilting maintenance workload is increased, and therefore, the interception settling velocity of the sedimentation tank has the lower limit inevitably under the economic and feasible conditions.
(4) The permeability coefficient of the aquifer is reduced in relation to the deposition of suspended matter, the larger the deposition, the larger the proportion of pore space blocked, the smaller the permeability coefficient, and for the usual non-pressure recharge (non-pumped well pressure recharge) mode, the permeability coefficient can be reduced to 10-8m/d, or even lower.
The embodiment of the invention provides a calculation method for evaluating the relationship between the scale of a sedimentation tank and the service life of groundwater recharge engineering, wherein the scale of the sedimentation tank refers to indexes such as the length, the area and the interception settling velocity of the sedimentation tank, and the service life of the groundwater recharge engineering refers to the time required for reducing the permeability coefficient to a certain threshold value under the condition of a certain groundwater recharge flux. The method is a method for establishing the relationship between the water replenishing quantity and the water replenishing efficiency and the normal service life of the engineering, and provides a core support for the design of the sedimentation engineering.
In addition, the standard capture rate function and aquifer filter characteristic length are described as follows:
whether suspended particles in source water are captured by filtering of an aquifer pore medium is mainly influenced by the aquifer pore medium, the composition of the suspended particles and the specific deposition amount, wherein the standard capture rate function reflects the influence of the particle size of the suspended particles on the capture rate, and the influence of the aquifer on the capture rate is reflected on the filtering characteristic length of the filter layer.
To solve the aquifer filtering coefficient, a standard capture rate function and an aquifer filtering characteristic length are determined.
Characteristic length of the filter layer: for a certain filter layer, if the probability that suspended particles with the particle size of 15 μm are captured by the filter layer after passing through the filter layer at a certain depth is equal to 0.01, the reciprocal of the depth value of the filter layer is taken as the characteristic length of the filter layer and is recorded as LcThe depth of the filtering layer is recorded in centimeters, and the characteristic length is dimensionless. The characteristic length of the filter layer reflects the capture capacity of the porous aquifer medium for suspended particles.
LcCan be obtained by a test method and an empirical curve estimation method respectively.
Firstly, designing a filtering test of a sand column filtering layer with any depth, and measuring inflow concentration C at the initial moment of filteringinAnd the effluent concentration CoutAnd inflow suspended particle grading distribution Qin(x) Calculating L from the formula (1)c。
Wherein P (x) is a standard capture rate function, and Δ L is a depth of a filter layer.
FIG. 2 is a diagram showing a fitting result of the characteristic length of a filter layer of a filter material with a specific surface area, as shown in FIG. 2, of the specific surface area of a porous water medium and the characteristic length L of the filter layercThe method has good correlation, the characteristic lengths of filter layers of 4 filter materials with different specific surface areas are calculated based on a large number of test results, linear fitting is carried out on the characteristic lengths, and the fitting resultSee fig. 2, whereby the results of the aquifer media particle can be used to estimate the filter characteristic length after calculating the specific surface area of the media.
Standard capture rate function: for a characteristic length of LcP (d) is suspended particles with the particle size d passing through the filter layer by 1/LcThe probability of capture by the filter after depth, referred to as P (d), is a standard capture rate function. FIG. 3 is a schematic diagram of a standard capture rate function according to an embodiment of the present invention, as shown in FIG. 3, the standard capture rate function reflects the influence of the size of suspended particles on the probability of being captured by a porous medium, in combination with the characteristic length L of a filter layercThe ability of suspended particles in the source water to block the aquifer can be quantitatively calculated.
The standard capture rate is shown in table 2.
TABLE 2 Standard Capture Rate P (d) Experimental empirical value Table
Fig. 4 is a flow chart of a sedimentation tank scale calculation method provided in an embodiment of the present invention, and as shown in fig. 4, a detailed embodiment of the present invention is as follows:
(1) firstly, analyzing the water supply condition information of the recharging water source, including the water supply process, the content and composition detection information of suspended particles, and determining the rated recharging flow, recharging frequency, the average concentration of suspended particles of the recharging water source and the particle size distribution (mass density function f expression) of the suspended particles.
Rated recharge flow rate: analysis and determination of the rated recharge flow QRated value(m3And d), the rated recharging flow rate is the lowest flow rate capable of recharging normally under the condition that the water source is sufficient, and if the flow rate is lower than the lowest flow rate, the recharging project is considered to be incapable of operating normally due to blockage and the like.
The recharge frequency is as follows: the recharge frequency gamma is the proportion of days of which the recharge water amount reaches the rated recharge amount to the total days of the whole year, and the average annual recharge frequency can be estimated according to the analysis of the water process of years.
Average concentration of suspended particles in the recharge water source: concentration of suspended particles C0(mg/L) The average concentration of the suspended particles of the recharge water source is determined by sampling, detecting and calculating for multiple times under different water supply conditions such as a rich water period, a dry water period and the like, and the weighted average concentration of the water supply is used as the average concentration of the suspended particles of the recharge water source.
Suspended particle mass density function f: the suspended particle mass density function refers to the mass density distribution of suspended particles of different particle sizes, and the integral over the entire particle size range is equal to 1, see the following formula.
In the formula: d is the particle size of suspended particles; f (d) as a function of the mass density of the suspension; m (d → d +. DELTA.d) is the total mass of suspended matters with the particle size between d and d +. DELTA.d in a unit volume water sample; m is the total mass of the suspended matter in the water sample of unit volume.
(2) Analyzing and evaluating to obtain the design interception settling velocity upper limit U 'of the sedimentation tank according to the actual condition of the recharge site and the rated recharge water quantity demand'0With a lower limit value U0'。
Interception sinking speed: interception sinking speed U0Means the settling velocity (mm/s) of the particles with the smallest particle size in the particles which can be completely removed in the sedimentation tank.
The total length and depth of the sedimentation tank need to be designed within a certain range under the constraint of field conditions and the requirement of rated reinjection water quantity. For an ideal advection type sedimentation tank, the surface load rate (namely the surface area water yield of the unit sedimentation tank) and the interception sedimentation velocity are equal in value, and under the condition that a turbulence correction coefficient k (k is 1.2-1.5) is considered:
in the formula, A is the construction area of the sedimentation tank. Therefore, under the condition of a certain rated backwater water quantity, the sinking velocity U is intercepted0Mainly determined by the area of the sedimentation tank. After investigating the site construction conditions, firstly, the maximum construction area and the minimum construction area of the sedimentation tank which are possible are evaluated and determinedCalculating according to the formula 3 to obtain an upper limit U 'of the trapped sinking velocity'0With a lower limit value U0'。
(3) Dispersing the interception sinking speeds from high to low into n, selecting the interception sinking speeds one by one, and calculating respectively (the selected first interception sinking speed is the maximum interception sinking speed, namely U)0＝U'0) Then, calculating the concentration C of suspended particles of the recharge source water after the recharge source water is precipitated in the sedimentation tank according to a still water sedimentation method1With particle size distribution f1。
Firstly, according to a 'manual design of Water works' table 38-3-1, a relation function U of suspended particle size and sinking speed is constructedi＝g(di) Or its inverse function di＝g1(Ui) Then, the suspended particle concentration C after the sediment of the recharging water source is calculated according to the following formula1With particle size distribution f1。
(4) Based on the particle size distribution f1Standard capture rate function P (d), aquifer filtering characteristic length LcCalculating an initial filter coefficient lambda0。
(5) Dispersing the time by day or week, and calculating specific deposition amount sigma and maximum specific deposition amount sigma of suspended particles by time interval based on initial filter coefficientmAnd the filtration coefficient lambda and the aquifer permeability coefficient K are changed until the aquifer permeability coefficient is smaller than a set threshold value, or the recharge engineering is stopped when the recharge engineering can not meet the rated recharge flow requirement at the moment.
The specific deposition amount is the volume of the deposited suspension as a percentage of the total volume, not exceeding the porosity of the porous medium. The maximum specific deposition amount refers to the maximum volume of the suspension which can be deposited in a unit volume, and the porosity can be used as the maximum specific deposition amount.
The filter coefficients are calculated from the initial filter coefficients according to the minutes formula:
according to the results of indoor multiple filtration and blockage tests, the reduction of the permeability coefficient of the aquifer caused by the recharge and blockage of the rain flood mainly occurs within 20cm of the surface layer. Therefore, when the clogging process of the recharging suspended particles is estimated, the flow concentration and the suspended matter specific deposition amount can be calculated according to the filtration coefficient and the filtration depth L by mainly considering the area within 20cm below the surface layer.
Cout/Cin＝exp(-λL) (8)
Wherein, CinFor influent concentration, i.e. C in the preceding text1And L is the depth (cm) of the top aquifer, in 20 cm.
Wherein, sigma is the specific deposition amount of suspended matters at the end of the calculation period, and sigma1The last time is the specific deposition of suspended matter, sigma2For calculating the increment of the deposited suspended matters in the time interval, T is the time length (d) of the time interval, rho is the dry volume weight of suspended particles, and the experimental value is 0.93g/cm3(i.e., the mass of suspended matter deposited per unit volume) and S is the recharge tank surface area.
And after the sigma is obtained through calculation, calculating the permeability coefficient of the surface layer of the recharge tank at the end of the time according to a Carman-Kozeny formula.
In the formula, K0The initial permeability coefficient of the aquifer is K, and the permeability coefficient of the sewage interception aquifer is K. y and z are parameters for representing the deflection of the capillary model and the spherical model, and both proposals areThe value is 1, epsilon0Is the initial porosity of the aqueous layer.
And with the increase of the iteration time period, the specific surface deposition amount is larger and smaller, the permeability coefficient is smaller and smaller, and the calculation is stopped when the permeability coefficient of the aquifer is smaller than a set threshold value or when the recharge project at the moment is considered to be incapable of meeting the rated recharge flow requirement. Permeability coefficient threshold KsThe method can be based on the maximum recharge depth, and the rated recharge flow is calculated by combining the Darcy formula.
In the formula, DhThe maximum water storage depth (m) of the recharging pool is L, wherein L is measured in meters, namely L is 0.2 m.
(6) Calculating according to the step 5 to obtain the specified interception sinking velocity U0Under the condition, the total water quantity W of the engineering recharging, in addition, the effective working time length (the service life A of the recharging engineering in unit year) of the recharging engineering can be calculated by combining the rated recharging flow Q and the recharging frequency gamma.
In the formula, n0The number of time segments is calculated for the total.
(7) And (3) selecting the next interception settling velocity from high to low, repeating the steps 3 to 6 until all the n interception settling velocities obtained through dispersion are calculated, and drawing a relation graph of the interception settling velocity-the engineering service life or the interception settling velocity-the total water quantity of engineering recharging.
(8) Drawing a relation curve of the sedimentation tank construction area and the engineering life according to a relation graph of the interception sinking speed and the engineering life or the interception sinking speed and the engineering recharge total water quantity or a combined formula 3, comprehensively considering the engineering life or the engineering recharge total water quantity and the construction, maintenance and land occupation costs of the sedimentation tank, providing a plurality of sets of construction schemes with different costs of different heights, and determining the corresponding service life of the recharge engineering or the engineering recharge total water quantity for a decision maker to select.
The invention mainly aims to fill the blank of scale design and calculation of the sedimentation tank for groundwater recharge of rainfall flood resources, and provides a calculation method for evaluating the relationship between the scale of the sedimentation tank and the service life of recharge engineering, thereby providing an important basis for the scale and size optimization design of the sedimentation tank.
On the basis of more than 100 groups of suspended particle blocking tests, the method firstly analyzes the characteristic that heterogeneous suspended particles block the aquifer with a pore structure, determines the rule that different concentrations and suspended particle distribution are absorbed by the aquifer, and establishes a standard capture rate function. Further establishing a decision relation of heterogeneous suspended particle flux with different concentrations and distribution to the permeability coefficient attenuation of the aquifer according to the relation of the deposition amount (the amount adsorbed by the aquifer) of the suspended particles and the permeability coefficient attenuation ratio established by a Carman-Kozeny empirical formula, thereby quantitatively evaluating the rate of blocking the aquifer under different recharging water source conditions after the pretreatment of precipitation, establishing the relation between the design treatment capacity of the sedimentation tank and the service life of the recharging project, and providing support for the optimization design of the groundwater recharging pretreatment project, the service life evaluation of the recharging project and the overall economic benefit evaluation.
Based on any one of the above embodiments, fig. 5 is a schematic view of a sedimentation tank scale control device of a rainfall flood resource groundwater recharge system provided by an embodiment of the present invention, as shown in fig. 5, the sedimentation tank scale control device of the rainfall flood resource groundwater recharge system provided by the embodiment of the present invention includes an obtaining module 501, an upper and lower limit of trapped settling velocity determining module 502, a discrete module 503, a calculating module 504, a determining module 505, a generating module 506, and a control module 507, where:
the obtaining module 501 is configured to obtain a rated recharging flow rate and recharging frequency of a recharging water source; the interception settling velocity upper and lower limit determining module 502 is used for determining an interception settling velocity upper limit value and an interception settling velocity lower limit value of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement; the discrete module 503 is used for separating a plurality of discrete interception sinking velocities from the interval between the interception sinking velocity upper limit and the interception sinking velocity lower limit; the calculation module 504 is configured to obtain a total recharge water amount corresponding to each discrete trapped settling velocity; the determining module 505 is configured to determine a recharging project life value according to a total recharging water amount and by combining a rated recharging flow rate and recharging frequency of a recharging water source; the generating module 506 is configured to generate a relationship diagram between the interception sinking rate and the recharging project life according to all the discrete interception sinking rates and all the recharging project life values; and the control module 507 is used for determining the optimal design interception settling velocity of the sedimentation tank according to the actual life value of the recharging project and by combining the interception settling velocity and the project life relation graph.
Based on any of the above embodiments, further, the calculation module is specifically configured to:
aiming at the target discrete interception settling velocity, calculating the concentration and the particle size distribution of suspended particles of recharge source water after the recharge source water is settled in a settling pond according to a still water settling method;
dispersing a plurality of settling periods in time, calculating specific sedimentation amount of suspended particles, a filtration coefficient and change of an aquifer permeability coefficient period by period based on an initial filtration coefficient, and taking the recharge amount when the aquifer permeability coefficient is smaller than a set threshold value as the recharge total water amount corresponding to the target discrete interception settling velocity.
Based on any of the above embodiments, further, the obtaining module is specifically configured to:
acquiring the water supply condition information of a back-supplementing water source, wherein the water supply condition information of the back-supplementing water source comprises the water supply process, the content and composition detection information of suspended particles;
and determining the rated recharging flow rate, recharging frequency, the average concentration of suspended particles in the recharging water source and the particle size distribution of the suspended particles according to the water supply process of the water source, the content of the suspended particles and the composition detection data.
Based on any of the above embodiments, further, the interception settling rate upper and lower limit determining module is specifically configured to:
acquiring the maximum value and the minimum value of the construction area of the sedimentation tank;
calculating an interception settling velocity upper limit value and an interception settling velocity lower limit value by utilizing a preset interception settling velocity formula according to the maximum value and the minimum value of the construction area of the sedimentation tank and the rated recharge water quantity requirement;
the preset interception sinking rate formula is as follows:
wherein, U0For intercepting the sinking velocity, k is the turbulent flow correction coefficient, QRated valueAnd A is the construction area of the sedimentation tank for the rated reinjection water quantity requirement.
The embodiment of the invention provides a sedimentation tank scale control device of a rainfall flood resource groundwater recharging system, which is used for executing the method in any embodiment.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 6, the electronic device includes: a processor (processor)601, a memory (memory)602, and a bus 603;
wherein, the processor 601 and the memory 602 complete the communication with each other through the bus 603;
obtaining rated recharging flow and recharging frequency of a recharging water source;
determining an upper limit value and a lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
separating a plurality of discrete interception sinking speeds from the upper limit value and the lower limit value of the interception sinking speed;
obtaining the total recharge water amount corresponding to each discrete interception settling speed;
determining a recharging engineering life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of a recharging water source;
generating a relation graph of the interception sinking speed and the service life of the recharging project according to all the discrete interception sinking speeds and all the recharging project service life values;
and determining the optimal design interception settling velocity of the sedimentation tank according to the actual life value of the recharging project and the relation graph of the interception settling velocity and the project life.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including:
obtaining rated recharging flow and recharging frequency of a recharging water source;
determining an upper limit value and a lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
separating a plurality of discrete interception sinking speeds from the upper limit value and the lower limit value of the interception sinking speed;
obtaining the total recharge water amount corresponding to each discrete interception settling speed;
determining a recharging engineering life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of a recharging water source;
generating a relation graph of the interception sinking speed and the service life of the recharging project according to all the discrete interception sinking speeds and all the recharging project service life values;
and determining the optimal design interception settling velocity of the sedimentation tank according to the actual life value of the recharging project and the relation graph of the interception settling velocity and the project life.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include:
obtaining rated recharging flow and recharging frequency of a recharging water source;
determining an upper limit value and a lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
separating a plurality of discrete interception sinking speeds from the upper limit value and the lower limit value of the interception sinking speed;
obtaining the total recharge water amount corresponding to each discrete interception settling speed;
determining a recharging engineering life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of a recharging water source;
generating a relation graph of the interception sinking speed and the service life of the recharging project according to all the discrete interception sinking speeds and all the recharging project service life values;
and determining the optimal design interception settling velocity of the sedimentation tank according to the actual life value of the recharging project and the relation graph of the interception settling velocity and the project life.
The above-described embodiments of the apparatuses and devices are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or 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 solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A sedimentation tank scale control method of a rainfall flood resource groundwater recharge system is characterized by comprising the following steps:
obtaining rated recharging flow and recharging frequency of a recharging water source;
determining an upper limit value and a lower limit value of the interception settling velocity of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
separating a plurality of discrete interception sinking speeds from the upper limit value and the lower limit value of the interception sinking speed;
obtaining the total recharge water amount corresponding to each discrete interception settling speed;
determining a recharging engineering life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of a recharging water source;
generating a relation graph of the interception sinking speed and the service life of the recharging project according to all the discrete interception sinking speeds and all the recharging project service life values;
and determining the optimal design interception settling velocity of the sedimentation tank according to the actual service life value of the recharging project and by combining the interception settling velocity and the recharging project service life relation graph.
2. The sedimentation tank scale control method for a rainfall flood resource groundwater recharge system according to claim 1, wherein the obtaining of the recharge total water amount corresponding to each discrete interception sinking velocity specifically comprises:
aiming at the target discrete interception settling velocity, calculating the concentration and the particle size distribution of suspended particles of recharge source water after the recharge source water is settled in a settling pond according to a still water settling method;
dispersing a plurality of settling periods in time, calculating specific sedimentation amount of suspended particles, a filtration coefficient and change of an aquifer permeability coefficient period by period based on an initial filtration coefficient, and taking the recharge amount when the aquifer permeability coefficient is smaller than a set threshold value as the recharge total water amount corresponding to the target discrete interception settling velocity.
3. The sedimentation tank scale control method for the rainfall flood resource groundwater recharge system according to claim 1, wherein the obtaining of the rated recharge flow rate and recharge frequency of the recharge water source specifically comprises:
acquiring the water supply condition information of a back-supplementing water source, wherein the water supply condition information of the back-supplementing water source comprises the water supply process, the content and composition detection information of suspended particles;
and determining the rated recharging flow rate, recharging frequency, the average concentration of suspended particles in the recharging water source and the particle size distribution of the suspended particles according to the water supply process of the water source, the content of the suspended particles and the composition detection data.
4. The sedimentation tank scale control method of a rainfall flood resource groundwater recharge system according to claim 1, wherein the determining of the upper limit value and the lower limit value of the interception sinking rate of the sedimentation tank according to the recharge site constraint condition and the rated recharge water demand specifically comprises:
acquiring the maximum value and the minimum value of the construction area of the sedimentation tank;
calculating an interception settling velocity upper limit value and an interception settling velocity lower limit value by utilizing a preset interception settling velocity formula according to the maximum value and the minimum value of the construction area of the sedimentation tank and the rated recharge water quantity requirement;
the preset interception sinking rate formula is as follows:
wherein, U0For intercepting the sinking velocity, k is the turbulent flow correction coefficient, QRated valueAnd A is the construction area of the sedimentation tank for the rated reinjection water quantity requirement.
5. The utility model provides a sedimentation tank scale control device of rainfall flood resource groundwater recharge system which characterized in that includes:
the acquisition module is used for acquiring the rated recharging flow and recharging frequency of the recharging water source;
the interception settling velocity upper and lower limit determining module is used for determining an interception settling velocity upper limit value and an interception settling velocity lower limit value of the sedimentation tank according to the constraint condition of the recharge site and the rated recharge water quantity requirement;
the discrete module is used for separating a plurality of discrete interception sinking speeds from the interval between the interception sinking speed upper limit and the interception sinking speed lower limit;
the calculation module is used for acquiring the total recharge water amount corresponding to each discrete interception settling velocity;
the determining module is used for determining a recharging engineering life value according to a recharging total water quantity and by combining the rated recharging flow and recharging frequency of the recharging water source;
the generating module is used for generating a relation graph of the interception sinking speed and the recharging project life according to all the discrete interception sinking speeds and all the recharging project life values;
and the control module is used for determining the optimal design interception settling velocity of the sedimentation tank according to the actual service life value of the recharging project and by combining the interception settling velocity and the recharging project service life relation graph.
6. The sedimentation tank scale control device of the rainfall flood resource groundwater recharge system according to claim 5, wherein the calculation module is specifically configured to:
aiming at the target discrete interception settling velocity, calculating the concentration and the particle size distribution of suspended particles of recharge source water after the recharge source water is settled in a settling pond according to a still water settling method;
dispersing a plurality of settling periods in time, calculating specific sedimentation amount of suspended particles, a filtration coefficient and change of an aquifer permeability coefficient period by period based on an initial filtration coefficient, and taking the recharge amount when the aquifer permeability coefficient is smaller than a set threshold value as the recharge total water amount corresponding to the target discrete interception settling velocity.
7. The sedimentation tank scale control device of the rainfall flood resource groundwater recharge system of claim 5, wherein the obtaining module is specifically configured to:
acquiring the water supply condition information of a back-supplementing water source, wherein the water supply condition information of the back-supplementing water source comprises the water supply process, the content and composition detection information of suspended particles;
and determining the rated recharging flow rate, recharging frequency, the average concentration of suspended particles in the recharging water source and the particle size distribution of the suspended particles according to the water supply process of the water source, the content of the suspended particles and the composition detection data.
8. The sedimentation tank scale control device of a rainfall flood resource groundwater recharge system according to claim 5, wherein the interception sinking velocity upper and lower limit determination module is specifically configured to:
acquiring the maximum value and the minimum value of the construction area of the sedimentation tank;
calculating an interception settling velocity upper limit value and an interception settling velocity lower limit value by utilizing a preset interception settling velocity formula according to the maximum value and the minimum value of the construction area of the sedimentation tank and the rated recharge water quantity requirement;
the preset interception sinking rate formula is as follows:
wherein, U0In order to intercept the sinking speed of the water,k is a turbulence correction factor, QRated valueAnd A is the construction area of the sedimentation tank for the rated reinjection water quantity requirement.
9. An electronic device, comprising: a memory and a processor;
the processor and the memory are communicated with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 4.
10. A non-transitory computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the method of any one of claims 1 to 4.
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