[0026] Example 1: Reference Figure 1 to Figure 3 , The method of measuring the maximum velocity of the surging water body, which includes,
[0027] The modular sensor is used to obtain pressure data, and fluid parameters such as water density and impact coefficient are input as needed. After the above-mentioned fluid parameters are calculated, the flow velocity value can be accurately obtained, and the maximum flow velocity can be obtained.
[0028] The above calculation formula is:
[0029]
[0030] Among them, in the formula: p is the pressure, u is the flow rate, ρ is the water density, C w Is the impact coefficient.
[0031] The above-mentioned modular pressure sensor is located above and perpendicular to the wave wall. The above-mentioned modular pressure sensor includes a rigid or flexible plate, and the front of the plate is provided with a pressure sensor, and the measurement data of different positions on the wave wall can be obtained as needed. The side and inside of the board are provided with perforated wire grooves capable of accommodating wires. The sensor is arranged in a double-row matrix. The use of a two-row matrix setting can minimize the number of sensors while measuring the required data. The distance between the sensors on the plate can be equidistant or unequal distance, which is set according to the needs of the test, generally 0.3 cm to 10 cm.
[0032] The value range of the above impact coefficient is 1.0 to 1.25, and the value of the above value is nonlinear.
[0033] Another object of the present invention is to provide a method for measuring the thickness of the over-wave water body. It includes,
[0034] The modular sensor is used to obtain the pressure data above the wave wall.
[0035] According to the above pressure data, the noise is cut and the vertical pressure distribution is obtained, and the pressure p is about 0, and In order to determine the boundary point between the water tongue area and the non-water tongue area, the vertical distance value from the above boundary point to the wave retaining wall is output, which is the thickness of the surging water body.
[0036] The following is a further explanation with test data, refer to Figure 4 to Figure 5 ,:
[0037] The embodiment uses the modular pressure sensor arranged vertically at the wave wall to measure the flow velocity of the surging water body using the conversion relationship between the dynamic water pressure and the flow velocity. The pressure sensors arranged closely at different heights can measure the pressure along the vertical line. The distribution can clearly reflect the position of the water tongue area and the non-water tongue area, and then obtain the water tongue thickness of the over-wave water body.
[0038] Attached Figure 4 The vertical distribution of the maximum pressure at the wave wall shows that the maximum pressure in this case is 30.8kpa. Through the transformation relationship between pressure and flow velocity, the maximum flow velocity of the surging water body is 6.9~7.7m/s. As the pressure above the wave wall is relatively concentrated in the height range of 0-4m, through the judgment of the water tongue area and the non-water tongue area, the thickness of the surging water body is calculated to be 4.3m. Attached Figure 5 It also reflects the relationship between the amount of surging waves and the pressure of the surging water body at the wave wall. It can be seen from the figure that as the amount of surging waves increases, the pressure of the surging water bodies increases rapidly, especially as the amount of surging waves increases from 0.263m 3 /(m.s) increased to 0.338m 3 /(m.s), the amount of surging has increased by 27%, and the corresponding maximum pressure has nearly doubled. From the perspective of the velocity of the top of the wave wall, the amount of over-wave is 0.263~0.305m 3 /(m.s), the maximum flow velocity can reach 7.5~13.9m/s. Therefore, as the amount of surging increases, the destructive force of the surging water caused by individual extremely large single waves on the seawall structure also increases, and the increase is much greater than the increase in the amount of surging.
[0039] The value range of impact coefficient includes but is not limited to: 1.0, 1.05, 1.1, 1.12, 1.13, 1.15, 1.2, 1.21, 1.22, 1.23, 1.24, 1.25. When the above-mentioned modular pressure sensor is arranged on the top or back slope of the embankment, the maximum flow velocity of the over-wave water at the top or back slope of the embankment can also be obtained. For the flow velocity of the surging water body on the top of the embankment and the back slope, image processing is used to determine the distance of the surging water body frame by frame, and the average flow velocity of the surging current along the top and back slope of the embankment is obtained. Wave volume 0.263~0.305m 3 /(ms), the maximum value of the average flow velocity measured along the top of the embankment and the back slope of the surging current is between 11.2~13.4m/s, which is basically close to the maximum flow velocity obtained by the pressure-velocity conversion of the present invention, showing the present invention The method is simple, quick and reliable.
