Design And Implementation Of Water-Depth Monitoring System Of Geotextiles-laying Boats

The Yangtze River Valley is very prone to accidents of bank collapse because the river banks have slowly been washed away by the waves and tides. In order to protect the banks and control the water channel,erosion control mattresses are placed at the bottom of the river. These mattresses are made of a special type of geotextile fabric. Geotextiles-laying boats are specifically used for placing the mattresses at the bottom of the river.This thesis develops Computer Monitoring System of Water Depth of the automatic control system for the geotextiles-laying boats used for the Yangtze River. This system can be used to monitor the change in the underwater ground profiles during the geotextiles-laying process. All the data related to the process is recorded by the system. The system can predict and analyze the ground sections that have potential impact on the geotextiles-laying, and improve the quality of the geotextiles-laying. This system has a user-friendly interface, which makes it easy to follow the working instructions.The water-depth computer monitoring system collects data from GPS, Multi-Frequency Fathometer (16 frequencies) and PLC network. Based on the analysis of these data, a three-dimensional underwater ground profile is presented for the scheduled area of geotextiles-laying, The development tool of the three-dimensional underwater ground profile is OpenGL.This thesis is organized into five chapters. Chapter One explains the research background and the scope of study. Chapter Two describes the design of the data collection system for the underwater ground profiles, which uses a PLC network. This chapter emphasizes the architecture of PLC network and presents the hardware design for the system. Chapter Three describes the software design for the data collection system and data communications using multi-threaded design. Chapter Four is the key chapter of this thesis. It introduces the tool used for developing three-dimensional contours, OpenGL and different methods for contour development. The underwater ground profiles can be shown in motion with the OpenGL visualization system, providing a virtual-reality experience. Chapter Five concludes the thesis with a summary.All the software of this system was developed with the VC6.0 platform, and had been successfully tested.