CN111350161A - Method for controlling boundary through estuary and coast model test - Google Patents

Abstract

The invention proposes a method for estuary and coastal model test control boundary. According to research needs, it is necessary to conduct research on multiple hydrological conditions, and different hydrological conditions have different experimental control boundary parameters. In the past, each experimental hydrological condition required time-consuming and labor-intensive adjustment of control boundary parameters. After obtaining a set of control boundary parameters on the basis of the first model calibration, this method summarizes and designs a set of effective and fast methods through correlation analysis and other means, and calculates the model control boundary under different hydrological conditions. Improve the efficiency of model testing. The invention has been successfully applied in many national key projects, and the research results meet the requirements of relevant specifications.

Description

A Method of Controlling Boundaries in Estuarine and Coastal Model Tests

technical field

The invention relates to a method for controlling boundary of an estuary and coastal model test, and belongs to the technical field of model control of estuary and coastal physical model tests.

Background technique

Similarity theory is an important theoretical basis for physical model test research. In 1686, Newton proposed the universal law of dynamic similarity, which laid the theoretical foundation for physical model tests. Since then, river engineering has gradually prospered. In 1956, the Nanjing Institute of Water Resources established the first tidal estuary model in my country. Through river engineering models, etc., the laws of estuarine and coastal tide wave propagation, flow velocity distribution, temporal and spatial distribution of water and sediment, and riverbed erosion and deposition are studied; throughout each stage of engineering design, the effect and impact of engineering plans are analyzed and studied by models, and the optimization, comparison and selection of plans are carried out. Provide technical support for program design and program implementation timing. In my country, physical model tests have been successfully applied in the research of the Three Gorges Project, the improvement of the deep water channel below Nanjing, the Sutong Yangtze River Bridge, the Hutong Yangtze River Bridge, the high-speed railway Dashengguan Yangtze River Bridge, and the Hong Kong-Zhuhai-Macao Bridge. Economic construction provides strong support.

Model tests are based on similarity theory, including: geometric similarity, motion similarity, dynamic similarity, etc. Similar phenomena obey the same law of motion and are described by the same mathematical and physical expressions. Therefore, the relationship between the scales of various physical quantities must also be constrained by these expressions and cannot be arbitrarily selected. The accuracy of the model needs to be checked by model validation.

For the estuary and coastal model, the model test can be divided into three steps: model calibration, verification and program test. The first step is to calibrate the model after the model is made and the measurement and control system is installed. Both calibration and verification are carried out with measured data, about 2 to 4 groups, and a representative hydrological condition is selected for calibration. Regarding the technical parameters, the calibrated model boundary control parameters are obtained at the same time. The workload is large, and it often takes half a month, a month or even more time. The second step is to use other hydrological conditions to verify the similarity of the models. After the verification is successful, the corresponding model control parameters will also be obtained. The workload is relatively small, but it usually takes at least one week. In the third step, after the verification is completed, the model can be used to carry out experimental research on the scheme, and representative hydrological conditions can be selected for testing according to needs, mainly including flood season high tide, dry season high tide, large flood, storm surge, etc. For bridge construction, it is also necessary to select the average flow tide, the 20-year flow tide, the 100-year flow tide, and the 300-year flow tide. The boundary control parameters of these test conditions are often at least one week, and sometimes the control parameters can only be generalized.

The open boundary in the estuarine and coastal model is usually controlled by the tidal boundary condition. Different models or the same model but with differences in runoff and tidal current, the control boundary will also be different. Therefore, each group of hydrological conditions mentioned above has different control boundary parameters.

Practice has shown that the selection of boundary control parameters is an important and time-consuming task in the model test. In the test process, it often takes a long time and many attempts to obtain the ideal control boundary, which affects the efficiency of the river engineering model test. At this stage, the rapid development of social economy is not suitable.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for controlling the boundary of an estuary and coastal model test. Experimental control boundary forecasting model for measured water regimes.

The invention provides a method for the control boundary of an estuary and coastal model test, wherein the model control boundary is a curve composed of a set of parameters at different times, and the method comprises the following steps:

The first step is to calibrate the model similarity based on the measured hydrological data. By modifying the model, debugging the measurement and control system, and modifying the control curve of the lower boundary of the model, until the model verification results meet the requirements of the "Technical Regulations for Coastal and Estuary Tidal Sediment Simulation" (JTST 231-2-2010), a set of natural measured curves is obtained. Corresponding model boundary control parameter curve;

The second step is to compare the calibrated model boundary control parameter curve with the corresponding natural measured curve. It is found that there are differences in the magnitude and phase of the parameters between the two curves, which indicates that the measured data cannot be directly used as the model boundary control parameter. Therefore, other The control boundary parameters of the test conditions need to be re-adjusted for the time-consuming and laborious control boundary parameters;

In the third step, on the basis of the successful model calibration, the present invention compares the relationship between the control boundary parameters obtained in the calibration test and the measured data curve, and analyzes the difference between the maximum value and the minimum value of the measured curve and the model boundary control parameter curve, The difference between the maximum value and the minimum value of the curve is called the tidal range, and the tidal range ratio a between the two curves can be obtained;

The fourth step, continue to analyze the time when the maximum and minimum values of the natural measured curve and the model boundary control parameter curve appear, and the phase difference t between the two curves can be obtained;

The fifth step is to obtain an algorithm reflecting the relationship between the original tide level data and the model tide level control parameters according to the parameters such as the maximum value, the minimum value, the tidal range ratio a, and the phase difference t between the two curves. The algorithm is shown in the following formula:

Z _i =a ₁ P _i-1 +a ₂ P _i +c

In the formula, Z _i represents the calculated value of the control parameter at time i in the model boundary control parameter curve, P _i-1 represents the measured tide level value at time i-1 in the natural measured tide level curve, and P _i represents the measured tide level value at time i in the natural measured tide level curve. The measured tide level value, i represents the time, a ₁ and a ₂ are coefficients, and c is a constant;

Step 6: Determine the control parameter curves of other tests of the model according to the algorithm of step 5, reduce the number of model validation test groups, save a lot of time-consuming and laborious test control boundary parameter adjustment work, and greatly improve the model test efficiency.

By adopting the method of the present invention, calibration and verification tests are firstly carried out according to the multi-model of the measured hydrological data, so as to ensure the similarity between the model and the prototype. During the calibration test, several measures such as debugging and modifying the model tidal level control boundary were taken until the similarity between the model tidal level and the natural tidal level met the relevant specification requirements, which was the most labor-intensive part of the model verification. After the model calibration is successful, a set of model control boundary parameters corresponding to the measured curve will be obtained. Due to the detailed differences between the two curves, other measured curves cannot be directly used as model boundary control parameter curves. It is time-consuming and laborious to use the test to obtain the boundary control control parameter curve of other test conditions, and the curve that needs to be verified has many groups (such as flood season spring tide, dry season spring tide, flood season neap tide, dry season neap tide, etc.); There are also multiple sets of hydrological conditions required for the test. In this way, the control boundary parameter curves that need to be determined according to the test are as few as 3 or 4, and as many as 10 or more, resulting in the selection of the above control boundary is a tedious and necessary work. The core of the present invention is to analyze the relationship between the control boundary that meets the requirements of the specification and the adjacent measured tide level, and summarize and design a set of effective and fast methods by means of model similarity, data interpolation and correlation analysis to calculate different hydrological conditions. Conditional Model Control Boundaries. On the basis of the successful model calibration, the verification test of more than one week can be completed in 1 to 2 days, which greatly improves the efficiency of the model test; the control curve parameters of the plan test that need more than one week to be determined can be obtained immediately according to the algorithm.

As a further technical scheme of the present invention, its detailed description is as follows:

In the first step, according to the first group of measured hydrological data, which is generally a tide level curve composed of an astronomical tide and 25-hour data, the model is calibrated by adjusting data such as model roughness and boundary control parameters; After success, the roughness of the model is determined, the model is similar to the prototype, and a set of experimental control parameters, that is, the model boundary control parameter curve corresponding to the measured hydrological data, will be obtained. Next, prepare to compare the curve with the measured curve, and try to analyze the relationship between the two curves, so as to save the time-consuming and laborious adjustment of boundary control parameters, and directly calculate other boundary control parameter curves through algorithms.

In the second step, comparing the relationship between the model boundary control parameter curve obtained in the calibration test and the measured curve, it is found that because the model control system has a process in responding to the control command composed of the control curve parameters, and the model boundary Inconsistent with the position of the measured station, there are differences in the maximum value, minimum value and phase between the two curves; this indicates that the model boundary control parameter curves of other hydrological conditions need to be re-adjusted before they can be used.

In the third step, the maximum and minimum values of the two curves are first analyzed, and the maximum and minimum values of the natural measured curves of the tide station adjacent to the boundary are recorded as P _max and P _min respectively, and the obtained model boundary control is calculated. The maximum and minimum values of the parameter curves are recorded as M _max and M _min respectively, and the tidal range ratio a between the two curves is calculated according to the following formula:

a=(M _max - M _min )/(P _max - P _min );

After analyzing the maximum and minimum values of the two curves, it is found that the measured tide level value P _{i at time i} and the tide level calculated value Z _i of the boundary control parameter curve have the following relationship:

Z _i =(M _max -M _min )/(P _max -P _min )×(P _i -P _min )+M _min (1)

In the formula, Z _i represents the tidal level calculated value of the boundary control parameter curve, Pi represents the tidal level value at time _i in the natural measured tidal level curve, P _max and P _min represent the maximum and minimum values of the natural measured tidal level curve of the tidal level station adjacent to the boundary, respectively. value, M _max and M _min respectively represent the maximum and minimum values of the model boundary control parameter curve obtained by calibration;

In the natural measured curve, P _max and P _min are fixed values. In the model boundary control parameter curve that has been calibrated, M _max and M _min are also fixed values, and because a=(M _max -M _min )/(P _max - P _min ), then the above formula is simplified to:

Z _i =a(P _i -P _min )+M _min (2)

In this way, after calculation and processing, we have successfully made the maximum and minimum values of the measured curve and the calibrated control parameter curve consistent, but there is a phase difference, which needs to be corrected.

In the fourth step, the time difference Tmax between the maximum values _Pmax and _Mmax of the natural measured curve and the model boundary control parameter curve is analyzed respectively, and the time difference _{Tmin difference} between the minimum values _Pmin and _Mmin occurs, and it is found that _Tmax The difference is not much _different from the T _{min difference} , and the average of the two can be obtained to obtain the phase difference of the two curves,

t=(T _{max difference} + T _{min difference} )/2 (3)

In the formula, t represents the phase difference between the natural measured curve and the control curve of the model boundary control parameters;

If t=0, then the two curves overlap; if t<0, then the phase of the natural measured curve is in the front; if t>0, then the phase of the natural measured curve is behind. In the actual model test process, the t value is generally between -1 and 0 due to the control accuracy of the model test.

In the fifth step, after determining the data size relationship a and the phase difference t between the two curves, the calculation formula of the parameters in the boundary control parameter curve is deduced. Considering that there is only a phase difference t between the two curves, the value of Z _i at moment i must be equal to P _i+ t at moment i+t, namely:

Z _i =P _i+t (4)

In the formula, Z _i represents the calculated value of the model boundary control parameter curve at time i, and P _i+t represents the measured tide level value of the natural measured curve at time it;

Since i+t is not necessarily an integer, the value of P _i+t is between the data of two integer points, which can be interpolated. After interpolation, it is brought into formula (4), and we get:

Z _i =(int(t+1)-t)P _i +(t-int(t))P _i-1 (5)

Combining Equation (2) in the third step and Equation (5) in the fifth step, we have:

Z _i =(a(P _i -P _min )+M _min +(int(t+1)-t)P _i +(t-int(t))P _i-1 )/2 (6)

Simplify this formula, then:

Z _i =(t-int(t))/2P _i-1 +(a+int(t+1)-t))/2P _i +(M _min -aP _min )/2

Let a ₁ =(t-int(t))/2, a ₂ =(a+int(t+1)-t))/2, c=(M _min -aP _min )/2, further simplify the formula ( 6), obtain the required model boundary control parameter calculation formula:

Z _i =a ₁ P _i-1 +a ₂ P _i +c (7)

In the formula, Z _i represents the calculated value of the control parameters at time i, P _i represents the measured tide level value at time i in the natural measured tide level curve, i represents the time, and other parameters are the same as before.

It can be seen from the above that the calculation formulas for the values of a ₁ , a ₂ and c are as follows:

a ₁ =(t-int(t))/2

a ₂ =(a+int(t+1)-t)/2

c=(M _min -aP _min )/2

In the formula, t is the phase difference between the two curves, a is the tidal range ratio between the two curves, M _min is the minimum value of the model boundary control parameter curve obtained by calibration, and P _min is the minimum value of the natural measured curve.

After the model is calibrated to determine the model boundary control parameter curve, the calculated value of the control parameter at each moment can be calculated according to the formula (7), saving a lot of time-consuming and laborious test parameter curve adjustment process.

Compared with the prior art, the present invention adopts the above technical scheme, and has the following technical effects:

(1) The present invention proposes a method for calculating the control boundary of a physical model of an estuary and coast;

(2) The method proposed according to the present invention can quickly calculate the physical model test control boundary under the hydrological conditions of each model verification and model test;

(3) The method proposed by the present invention can be used to calculate the control boundary of the physical model of the moving bed without using the generalized control curve;

(4) Through the method of the present invention, the traditional model verification within one week to half a month can be completed within 1 to 2 days, and the short one-week test curve determination work can be determined immediately by calculation, which greatly shortens the time. working hours.

According to the research needs, the present invention needs to conduct research on multiple hydrological conditions, and different hydrological conditions have different experimental control boundary parameters. In the past, each experimental hydrological condition required time-consuming and labor-intensive adjustment of control boundary parameters. After obtaining a set of control boundary parameters on the basis of the first model calibration, this method summarizes and designs a set of effective and fast methods through correlation analysis and other means, and calculates the model control boundary under different hydrological conditions. Improve the efficiency of model testing. The invention has been successfully applied in many national key projects, and the research results meet the requirements of relevant specifications.

Description of drawings

Fig. 1 is a flow chart of the method for controlling the boundary of the estuarine and coastal model test in the present invention.

FIG. 2 is a comparison diagram of the model calibration control curve of the mouth section of the Yangtze River in the present invention and the measured tidal level process line of Wusongkou Station.

FIG. 3 is a comparison diagram of the tidal level of Wusongkou in the mouth of the Yangtze River and the calculated control parameters in the present invention.

Fig. 4 is a probabilistic control curve and a calculation control curve diagram of a moving bed model test of a model in the mouth of the Yangtze River in the present invention.

Detailed ways

The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings. These examples are only intended to illustrate the present invention and not to limit the scope of the present invention.

As shown in Figure 1, the method for controlling the boundary of the estuary and coastal model test of the present invention comprises the following steps:

(1) After the model is made and the measurement and control system is installed, the model calibration is started according to the hydrological conditions of the first set of verification tests. The initial boundary control parameter curve can be the curve of the adjacent measured water level station (referred to as "measured curve"). Compare the data simulated by the model with the measured data, correct the model, debug the measurement and control system, and modify the control curve of the lower boundary of the model until the model calibration results meet the "Technical Regulations for Coastal and Estuary Tide and Sediment Simulation" (JTST231-2- 2010) specification requirements, so far the rate has been successful.

(2) After the calibration is successful, a set of model boundary control parameter curves are obtained, and the relationship with the "measured curve" is compared. The data comparison is shown in Table 1, and the graph comparison is shown in Figure 1. It can be seen from the chart that there is a phase difference between the two curves, and there will also be a difference between the maximum and minimum values. Therefore, the measured data cannot be directly used as the control parameters of the model boundary.

(3) Analyze the difference between the maximum value and the minimum value of each curve. In the estuary and coast model, the professional term is called "tidal range", and the ratio a of the tidal range between the two curves is calculated.

(4) Comparing the time difference at the average tide level of the two curves by the graphical method can be used as the phase difference between the two curves to obtain the phase difference t.

(5) Through the analysis of the tidal range ratio a and the phase difference t, the calculation formula of the control curve parameters is obtained:

Z _i =a ₁ P _i-1 +a ₂ P _i +c (7)

In the formula: Z _i ——the control parameter at time i is calculated, unit: m;

P _i ——the value at time i in the measured tide level curve, unit: m;

i - time, unit: hour;

a ₁ , a ₂ - coefficients, a ₁ =(t-int(t))/2, a ₂ =(a+int(t+1)-t)/2;

a——the tidal range ratio of the two curves, a=(M _max -M _min )/(P _max -P _min )

c——constant, c=(M _min -aP _min )/2

P _max , P _min ——the maximum and minimum values of the tide level curve of the measured tide level station adjacent to the boundary, unit: m;

M _max , M _{min ——the} maximum and minimum values of the model control boundary parameter curve obtained by calibration, unit: m.

(6) Calculate the control boundary of the model test according to the above calculation formula. The measured tide level curves of adjacent tide level stations under various hydrological conditions are calculated from the relevant hydrological analysis. The general test conditions are 8 groups or more, and the workload of one week can be instantly determined by the calculation method of the present invention.

The method of the invention has been successfully applied in the estuary model of the Yangtze River of the Nanjing Institute of Water Resources Research, a national key laboratory, the model of the PAYRA power plant in Bangladesh, and the physical model of the Changtai Yangtze River Bridge.

Example 1

In this embodiment, the State Key Laboratory of the Yangtze River Estuary Model is used as an example to calculate the control boundary parameter curve of the southern branch of the Yangtze River.

The State Key Laboratory of the Yangtze Estuary Model is located in the Tiexinqiao Base of the Nanjing Institute of Water Resources, which belongs to the State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering Science. The model is nearly 300m long, equivalent to 190km in nature. The model has a horizontal scale of 655 and a vertical scale of 100. The Yangtze River Estuary is a medium-strength tidal estuary with runoff in the upper reaches, and the Wusong Mouth, the lower boundary of the model, is controlled by tides. The model of this embodiment was built in 2005, and was upgraded in 2017 due to the special research and development needs of the national major instrument development. After the reconstruction, the control boundary including the lower boundary Wusongkou needs to be calibrated and verified, and the control boundary of each verification hydrological condition and experimental hydrological condition is given.

There are 3 sets of hydrological conditions in this verification, and 6 sets of control boundaries should be provided for the downstream Wusongkou boundary:

(1) Measured hydrological data in September 2015, large and neap tides. The average flow during the survey period is 30000m ³ /s.

(2) The hydrological data measured in August 2018, the spring tide and the neap tide, the average flow during the measurement period was 37780m ³ /s.

(3) The measured hydrological data in June 2019, the spring tide and the neap tide, the average flow during the measurement period was 46000m ³ /s.

The test hydrological conditions are divided into two groups: fixed-bed test hydrological conditions and moving-bed test hydrological conditions:

(1) 6 groups of hydrological conditions for fixed bed test: dry season spring tide, flood season spring tide, 97 storm surge, 98 flood tide, 20-year flow tide, 100-year flow tide and 300-year flow tide; upstream flow They are 16500m ³ /s, 56800m ³ /s, 45500m ³ /s, 85000m ³ /s, 85000m ³ /s, 96000m ³ /s and 100400m ³ /s, respectively. The downstream boundary exists due to different upstream flow and downstream tidal strength. difference;

(2) 5 groups of hydrological conditions for moving bed test: normal flood and sediment year, 2010 wet year, 100-year flow process year, 300-year flow process year, and several consecutive hydrological years; upstream flow is corresponding or optimized The annual flow process of , and the downstream boundary is the matching tidal level process.

In summary, there are a total of 17 sets of experimental control curves that need to be provided at the Wusongkou boundary.

(1) Model making and installation of measurement and control system are completed. The model is calibrated using the measured hydrological data in September 2015. During the measurement period, the upstream runoff is 30,000m ³ /s, and the Wusongkou tide level station is about 2.0m away from the control boundary. First, control the water level according to the measured water level station curve (referred to as "measured curve") of the adjacent Wusongkou Station, which is about 2.0m away from the control boundary. Compare the data simulated by the model with the measured data, modify the model, debug the measurement and control system, and modify the control curve of the lower boundary of the model until the model verification results meet the "Technical Regulations for Coastal and Estuary Tide and Sediment Simulation" (JTST 231-2- 2010) specification requirements, and the calibration test was completed.

(2) After the calibration test is completed, the boundary control parameter curve of the Wusongkou model and the measured tide level hydrograph of Wusongkou Station are obtained. The comparison results of the two are shown in Figure 2, and the data list is shown in Table 1. It can be seen from Figure 2 that there is a difference between the two curves, which means that in this model, the control boundary of the final model cannot be directly controlled by the measured station or the existing curve.

Table 1 Model calibration control curve and measured tidal level process data at Wusongkou Station

(3) According to the data in the above table, there are:

P _max =2.33, P _min =-0.68, M _max =2.31, M _min =-0.35, then:

a=(M _max - M _min )/(P _max - P _min )=0.884.

(4) Using the graphic method, measure the time difference between the two curves to obtain the phase difference, with t=-0.33 hours.

(5) The coefficients and constants in the formula (7) are calculated from the above data.

a ₁ =(t-int(t))/2=(-0.33-int(-0.33))/2=0.335

a ₂ =(a+int(t+1)-t)/2=(0.884+int(-0.33+1)+0.33)/2=0.607

c=(M _min -aP _min )/2=(-0.347+0.884×0.68)/2=0.13

Then, equation (7) can be written as:

Z _i =0.335P _i-1 +0.607P _i +0.13

This formula is the calculation formula of the boundary control parameters of the model in the mouth of the Yangtze River. According to the different Wusongkou tidal level process curve values P _i under various test conditions, the curve is provided by natural measurement or mathematical model calculation, and the corresponding model lower boundary model control parameter curve can be obtained by calculation, as shown in Figure 3.

In the same way, the lower boundary control parameter curve of the moving bed model test can be obtained. The calculated average annual runoff control parameter curve is shown in Figure 4. The generalized curve parameters in this figure are the control curves without formula calculation before the model transformation.

After the above models have been verified and the control parameters of fixed-bed and moving-bed model tests have been determined, a number of national major special projects, water conservancy and transportation and other major scientific and technological projects have been studied. There are:

(1) Transportation Construction Science and Technology Project (2011 3287 4660): Research on key technologies of deep water channel system governance in Fujiangsha, Tongzhousha and Baimaosha in the Yangtze River;

(2) National Major Scientific Instrument and Equipment Development Project (2011YQ070055): Development of intelligent measurement and control system for large-scale river engineering model tests in my country;

(3) National 863 Program (2012AA112508): Research on deep water channel regulation technology in the tidal branch section;

(4) Jiangsu Provincial Water Conservancy Science and Technology Project (2015004): Research on the evolution law of the Yangtze River in the Jiangsu section of the Yangtze River and key technologies for comprehensive management;

(5) Phase I and Phase II of the 12.5-meter deep-water channel renovation project below Nanjing in the Yangtze River; comprehensive renovation project in the Chengtong section of the Yangtze River;

(6) Bridge or tunnel projects such as Hutong Yangtze River Bridge, Changtai Yangtze River Bridge, Yantaixi-Changyi River Crossing Channel, Sino-Russian Natural Gas Crossing River Pipeline, and Beiyan River Crossing River Channel.

Claims (6)

1. a method for estuary and coastal model test control boundary, is characterized in that, comprises the following steps: The first step is to calibrate the similarity of the model according to the measured hydrological data. By modifying the model and debugging the measurement and control system, the lower boundary control curve of the model is modified until the model verification results meet the "Coastal and Estuary Tidal Current and Sediment Simulation Technical Regulations" (JTST). 231-2-2010) specification requirements to obtain a set of model boundary control parameter curves corresponding to the natural measured curves; The second step is to compare the calibrated model boundary control parameter curve with the corresponding natural measured curve; The third step is to analyze the difference between the maximum value and the minimum value of the natural measured curve and the model boundary control parameter curve, and the difference between the maximum value and the minimum value is called the tidal range, and the tidal range ratio a between the two curves can be obtained; The fourth step, by analyzing the time when the maximum and minimum values of the natural measured curve and the model boundary control parameter curve appear, the phase difference t between the two curves can be obtained; The fifth step is to obtain an algorithm reflecting the relationship between the original tide level data and the model tide level control parameters according to the maximum value, minimum value, tidal range ratio a, and phase difference t between the two curves. The algorithm is shown in the following formula: Z _i =a ₁ P _i-1 +a ₂ P _i +c In the formula, Z _i represents the calculated value of the control parameter at time i in the model boundary control parameter curve, P _i-1 represents the measured tide level value at time i-1 in the natural measured curve, and P _i represents the measured tide level at time i in the natural measured curve value, i represents the time, a ₁ and a ₂ are coefficients, and c is a constant; The sixth step is to determine the control parameter curves of other tests according to the algorithm of the fifth step, and then carry out the model test. 2. the method for a kind of estuarine and coastal model test control boundary according to claim 1, is characterized in that, in the described first step, according to a group of measured hydrological data, by adjusting model roughness, boundary control parameter, carry out the model to the model. Calibration; after the model calibration is successful, the roughness of the model is determined, the model is similar to the prototype, and a set of experimental control parameters are obtained at the same time. 3. the method for a kind of estuary and coast model test control boundary according to claim 1, is characterized in that, in the described second step, compare the relationship between the model boundary control parameter curve obtained in the calibration test and the measured curve, Since the response of the model control system to the control command composed of the control curve parameters has a process, and the model boundary is inconsistent with the position of the measured station, there are differences in the maximum value, minimum value and phase between the two curves. 4. the method for a kind of estuarine coast model test control boundary according to claim 1, is characterized in that, in the described 3rd step, at first analyze the maximum value and minimum value of two curves, the natural actual measurement of the tide level station adjacent to the boundary is The maximum and minimum values of the curve are recorded as P _max and P _min respectively, and the maximum and minimum values of the model boundary control parameter curve obtained by calibration are respectively recorded as M _max and M _min , and the tidal difference between the two curves is calculated according to the following formula than a, a=(M _max - M _min )/(P _max - P _min ). 5. the method for a kind of estuary model test control boundary according to claim 1, is characterized in that, in the described 4th step, the maximum value _Pmax and _Mmax of analyzing natural measured curve and model boundary control parameter curve respectively appear. The time difference T _{max is the difference} between the minimum values P _min and M _min , the time difference T _{min is the difference} between the minimum values P min and M min, the phase difference between the two curves can be obtained, t=(T _{max difference} + T _{min difference} )/2 In the formula, t represents the phase difference between the natural measured curve and the control curve of the model boundary control parameters; If t=0, then the two curves overlap; if t<0, then the phase of the natural measured curve is in the front; if t>0, then the phase of the natural measured curve is behind. 6. the method for a kind of estuary and coastal model test control boundary according to claim 1, is characterized in that, in described 5th step, calculate the value of a ₁ , a ₂ and c by following formula, a ₁ =(t-int(t))/2 a ₂ =(a+int(t+1)-t)/2 c=(M _min -aP _min )/2 In the formula, t is the phase difference between the two curves, a is the tidal range ratio between the two curves, M _min is the minimum value of the model boundary control parameter curve obtained by calibration, and P _min is the minimum value of the natural measured curve.

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