Underwater Imaging Detection Technology For The Drainage Plate of The Yangtze River Estuary

Abstract: Aiming at the problem of insufficient detection means for plastic dimple drainage board for sale in the deepwater area of ​​the Yangtze River estuary, a new method of underwater acoustic imaging detection is proposed. The high-resolution side-scan sonar and dual-frequency identification sonar are used to realize the visualization of underwater dimple drainage board manufacturers detection. Measurable. Obtain clear image data of the underwater dimple drainage board manufacturers, and realize the quantitative detection of the dimple drainage board manufacturers by the dual-frequency recognition sonar underwater fixed-point full-loop imaging method. The new method makes up for the shortcomings of existing testing methods and can be used as an important supplement to existing testing methods.

Keywords: Yangtze River estuary; plastic dimple drainage board for sale; underwater imaging; side-scanning sonar system; dual-frequency identification sonar system

With the sustained and rapid development of China’s coastal areas, the demand for land resources has been increasing, and the upsurge of development towards rivers, lakes, and seas has arisen. The projects along the rivers and coastal areas have been expanded from shoals to deep water areas.

The soft soil found in the Yangtze River estuary area is deep and the hydrological conditions are complex. The drainage consolidation method is usually used for soft foundation treatment to shorten the consolidation time of soft soil. The plastic dimple drainage board for sale consolidation method is a fast, efficient and economical soft foundation treatment method. The method uses a plastic dimple drainage board manufacturers as a vertical drainage channel, and a sand cushion layer laid on the surface of the soft soil serves as a horizontal drainage channel to exclude soft soil. The water is used to achieve the purpose of soft soil consolidation, thereby increasing the bearing capacity of the foundation.

The main problems of inserting plastic dimple drainage board manufacturers underwater are concentrated on plane positioning, insertion depth, exposed length, and belt retraction. These problems directly affect the effectiveness of underwater plastic dimple drainage board for sale work and thus affect the bearing capacity of soft soil foundation. The underwater part is mostly the foundation of the water part. Therefore, the stability of the underwater part project determines the success or failure of the whole project.

Considering the complexity of the underwater construction environment, the concealment and the importance of underwater engineering for water engineering, research on underwater quality inspection technology to obtain visual, quantifiable and traceable objective records to ensure the quality and safety of the project. Construction progress is extremely important.

This experiment selected a certain circle project of Changxing Island in Shanghai as the test site. The project is close to the Changxing submerged embankment of the third phase of the Yangtze River deepwater channel, which belongs to the Yangtze River bed-river floodplain. The mud surface elevation of the east bank of the project is -8.0~-5.0m. The surface of the river bed in the project area has a large silt thickness, poor engineering performance, and the base bed needs to be reinforced. The construction area has a fast water flow rate, high water turbidity, and poor hydrological conditions. Among them, the plastic dimple drainage board for sale construction area adopts two layers of 75cm bottom long sandbag cushion, and then the C-shaped plastic dimple drainage board manufacturers are inserted into the upper part of the long bag with a stable professional plug-in boat. The drainage plates are arranged in a square shape with a spacing of 1.0 m between adjacent drainage plates and a local spacing of 1.5 m.

1. Underwater drainage board construction quality inspection method

The inspection methods of the underwater dimple drainage board for sale construction project mainly include inspection of construction records, observation inspection, theodolite measurement, suspension line measurement, steel rule measurement, diving exploration and so on. The applicable conditions, objectivity and economic cost of each test method are compared and shown in Table 1.

Table 1 Comparison of common methods for quality inspection of underwater dimple drainage board for sale construction

It can be seen from Table 1 that the traditional underwater construction detection method is more suitable for shallow water environment above the shoal, above the water surface and with small flow velocity, and the engineering economy is good, but the water depth and the urgent area cannot be used or detected, and the accuracy will be remarkable. Reduced, the reliability and objectivity of the test results have obvious shortcomings.

As the project progresses to the deepwater area, the risk of underwater construction is further increased, and traditional construction quality control and testing methods are increasingly challenged. Therefore, it is necessary to explore new testing methods to reduce the engineering risks faced during the construction and operation phases.

2. New technology for underwater drainage board construction inspection

2.1 Plug-in ship plane positioning and insertion depth detection
The surface positioning of surface vessels is usually based on the mature differential global positioning system (DGPS) technology, which can be similarly tested for parallel detection with high detection accuracy. The insertion depth detection has been discussed in the article “Discussion on the monitoring method for the depth detection of plastic dimple drainage board for sale“, and it has been gradually applied in engineering projects.

2.2 Drainage board exposed length, retraction and distribution density detection
In the process of research on underwater dimple drainage board manufacturers detection, in order to find out the distribution pattern and distribution density of underwater plastic dimple drainage board manufacturers, the latest underwater imaging technology is adopted to visually reflect the actual state of underwater dimple drainage board for sale after construction. The distribution pattern, distribution density of the dimple drainage board for sale above the mud surface, and the length of the dimple drainage board manufacturers above the mud surface are explored as an important index for analyzing the soft foundation reinforcement effect.

In the test process, the side-scan sonar and dual-frequency recognition sonar imaging technology were used to detect the underwater plastic dimple drainage board for sale.

2.2.1 Side-scan sonar imaging technology
The test uses the Deep Vision DE680D side-scan sonar system with an imaging resolution of 1 cm to produce a high-quality underwater image. The system equipment composition is shown in Figure 1.

Figure 1Deep Vision side scan sonar system

The technical specifications of the Deep Vision DE680D side-scan sonar imaging system are shown in Table 2.

Table 2 Specifications of Deep Vision Side Scan Sonar Imaging System

Introduce the Deep VisionD E680D side-scan sonar imaging system into the underwater dimple drainage board for sale quality inspection, first make the line planning on the computer, and debug the best imaging angle to the engineering site to obtain the image characteristics of the underwater C-type plastic dimple drainage board manufacturers. 2).

Figure 2 Deep Vision DE680D side sweep sonar underwater dimple drainage board for sale imaging

It can be seen from Fig. 2 that there are many plastic drainage plate strips above the mud surface, which are densely distributed as a whole, and can be qualitatively tested on the plastic dimple drainage board manufacturers.

2.2.2 Dual-frequency recognition sonar imaging technology
The test area is located at the mouth of the Yangtze River and the water body is cloudy. In order to obtain better imaging results in water, the experiment uses a dual-frequency identification sonar imaging system to image the construction of an underwater plastic dimple drainage board for sale (Figure 3). The dual-frequency recognition sonar system has the characteristics of clear imaging, small size, lightweight, and easy installation and carrying.

Figure 3 identifies the main imaging device of the sonar system

The technical indicators used in the test to identify the sonar imaging system are shown in Table 3.

Table 3300m Standard type identification sonar imaging system technical indicators

The test uses a dual-frequency recognition sonar imaging system to dynamically display underwater conditions in real-time. The image characteristics of the underwater C-type plastic dimple drainage board manufacturers obtained at the engineering site are shown in Figure 4.

Figure 4 Dual-frequency identification sonar dimple drainage board for sale underwater imaging

The length, width, area, etc. of the detected object can be measured by the adaptation software, and the digital file can be saved and played back after the end of the imaging. If the underwater fixed-point full-loop camera is used (the anchor detection platform is moved to the predetermined detection position, the underwater lens is rotated along the vertical axis, and rotated 30 times each time, for a total of 12 rotations), the collected single fan image is used for internal business. Splicing, the target range to be photographed will be stitched into a ring. After pre-processing, image registration, coordinate positioning processing, and other steps to obtain clear image and position information of the block, the number and theoretical quantity of the drainage plates in the detection range can be counted, and the quantitative detection of the underwater dimple drainage board for sale can be realized.

Through image analysis, the number of plastic dimple drainage board manufacturers, the exposed length of the dimple drainage board manufacturers, the spacing and distribution characteristics of adjacent dimple drainage board manufacturers can be counted, and the construction quality of the underwater plastic dimple drainage board for sale can be judged by combining the design drawings.

3. The underwater plastic dimple drainage board manufacturers imaging detection method is compared by experiment and comparison, and the basic clear image can be obtained in the case of deepwater depth and turbid water body. The two underwater imaging methods have their own advantages and disadvantages, and the related indicators are shown in Table 4.

Table 42 Comparison of underwater imaging methods

It can be seen from Table 4 that the two underwater imaging detection methods are applicable to the detection environment of the current deepwater project, and the relevant detection indicators are quite different. In general, the side-scan sonar imaging is suitable for imaging detection of a wide range of underwater dimple drainage board for sale, and the key parts can be detected by identifying sonar imaging, and the two can also be combined.

In the specific implementation process, the comprehensive analysis should be carried out according to water depth conditions, engineering safety risk grades, engineering quality standards, and economic costs, and appropriate underwater testing methods should be selected.

4. Conclusion

(1) Using underwater acoustic imaging detection method to obtain clear image data of the dimple drainage board for sale, and realize the visualization of underwater dimple drainage board manufacturers detection;

(2) The underwater drainage imaging method is used to detect the dimple drainage board manufacturers, which has obvious objectivity compared with the artificial diving detection method;

(3) The dual-frequency recognition sonar system software can accurately measure the image, and combine the underwater fixed-point full-loop imaging mode to realize the quantitative detection of the distribution density of the dimple drainage board for sale;

(4) The new method makes up for the shortcomings of the existing testing methods and has good adaptability in the deepwater area of ​​the Yangtze River estuary, which can be used as an important supplement to the existing monitoring and testing methods.