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Study on Real-Time Monitoring Technology of Channel Siltation Location and Height in Shallow Sea

Author: ZhangXun
Tutor: TangWenYan;XuWenHai
School: Harbin Institute of Technology
Course: Instrument Science and Technology
Keywords: Silting Real-time monitoring Sound propagation attenuation Multi-class support vector machine Support vector machine regression
CLC: U612.2
Type: PhD thesis
Year: 2008
Downloads: 129
Quote: 2
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Abstract


The bottom of the shallow sea waterway siltation serious case of wind, wave and current weather hydrological, due to the lack of real-time monitoring tools, often caused economic losses due to the loading of the ship is too small or loading too much cause the ship to run aground, comprehensive blocking port problems. In this paper, according to the characteristics of shallow waterway the fairways of acoustic wave propagation characteristics and attenuation characteristics, based on the method suitable for real-time monitoring of shallow marine the fairway silt deposition in the location and height of technology. Major research paper are as follows: ray acoustic theory to describe the acoustic propagation of the field of underwater acoustics, simplify the speed of sound distribution based on the analysis of the shallow water waterway small grazing angles of sound propagation characteristics, results showed that: Fairway small and medium grazing angle sonic sound line trajectory approximate a straight line. Sea Surface acoustic wave reflection and transmission characteristics based on Snell's law and the law of conservation of energy, the study results: acoustic wave propagation to the surface reflection and transmission, but the transmission of energy is far less than the reflected energy, acoustic wave propagation in the sea can be seen as total reflection. Acoustic wave propagation in shallow water waterway silt layer, derived by comparing the scattering and transmission coefficients: the propagation of high-frequency sound waves on the ocean floor, the vast majority of the sound energy transmission to the deposited layer, the scattering of the acoustic energy can be ignored. , The establishment of the of ultrafine polydisperse particle suspension sound propagation attenuation loss model, formulated in the laboratory using different diameter glass beads and an aqueous suspension of titanium dioxide on the five frequency based on the theory of Bouguer-Lambert-Beer-Law Ultrasonic acoustic attenuation measurement, verification of the model is effective. The model is based on the combination of extended loss of sound in seawater and absorption losses, the turbid waters of acoustic wave propagation attenuation model attenuation measurements through the sound propagation in a waterway in the Bohai Sea, the results show that the shallow water the fairway muddy waters of acoustic wave propagation attenuation loss and related to the particle size, particle concentration, and the acoustic frequency. According to the shallow water channel siltation measurement or prediction method is not capable of real-time monitoring, seismic CT chromatography structural features in the shallow water waterway sound propagation law based on the real-time monitoring of the location of shallow water channel siltation and sedimentation height - Based on the fairway side of the multi-transducer array sensor the silting monitoring method, and design the system principle prototype. The method is placed in the fairway side a transmitting transducer array, and the other side placed in a receiver array, sequentially turned on in the transmitting transducer emitting acoustic signals in the monitoring reception signal, while all of the transducers in the receiving array, siltation position and the siltation height receives sonar signals corresponding power spectrum peak transmission time is also different, discrimination on the basis of this difference can be the siltation of the monitoring area. Monitoring data transmission to a shore-based monitoring center wireless module, application client can use the Internet to achieve real-time monitoring of the location of shallow water channel siltation and sedimentation height. In the discriminant the shallow water waterway siltation position and siltation height based on decision-oriented acyclic graph support vector machine (Decision Directed Acyclic Graph Support Vector Machine, the algorithm referred DDAGSVM) multi-class problems silting position discrimination method based on support vector Machine Regression the channel siltation highly discriminating law. Using discrete KL (Karhunen-Loeve) transform to extract the the silting feature vector and actual siltation position and siltation height training samples were grouped siltation position and deposition of highly trained samples silting position discrimination was parallel to the width of the fairway is divided into several regions and to each region as a class siltation, between each of the two types each construct a classifier silting position training samples of the classifier training the the siltation eigenvectors into the trained classifier the combined DDAGSVM algorithm, identifies the siltation position use of siltation highly trained; In cholestasis height discrimination, training sample the siltation height regression model, siltation feature vectors into training good silting height regression model identifies the waterway silting height. Seen through the muffler pool and shallow waterway siltation discrimination experiments: the discriminant accuracy of the of siltation position in an anechoic water tank 3m, actual fairways demand in the the waterway silting location discrimination accuracy reached; the height discrimination silting accuracy can reach 60 mm. The discrimination results compared with traditional neural network method, this method has good discriminant discriminant speed, versatility and advantages.

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CLC: > Transportation > Waterway transport > Waterway Engineering > Planning, surveying, design and calculation > Survey
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