Abstract
The combination of Global Positioning System-Real Time Kinematic (GPS-RTK) and depth sounder is an important technical method of modern underwater topographic survey. In this paper, the combined technology was integrated with unmanned surface vehicle (USV) technology to construct an unmanned survey system suitable for underwater topographic survey in stilling basin, and it was applied to survey the underwater topography of the stilling basin of Tingzikou hydrojunction project. Based on the surveying and mapping data and 3D model, the trend of elevation change of the stilling basin including apron, end sill, antiscour section, and river convergence section was analyzed. The results show that, for the surface outlet stilling basin of Tingzikou, after flood, the structure is complete, the boundaries are clear, the water quality is good, and there is little sediment on the surface of apron from overflow dam section to end sill. Furthermore, no obvious sediment or structural abnormality has been found in the still basin. Affected by the bedrock and cofferdam cobble gravel sediment, the elevation of the antiscour section and the downstream convergence section of the surface outlet stilling basin increased significantly. For the bottom outlet stilling basin of Tingzikou, there is large sediment within a range of 20 m∼40 m from the bottom sill and the maximum height of it reaches 2.04 m, while there is no obvious sediment or structural abnormality in the remaining region of basin. The critical sedimentation height can effectively judge the safety grade of the sedimentation height in stilling basin and provide a reliable support for assessing the overall safety of stilling basin. The application of unmanned survey technology improves the accuracy and timeliness of underwater topography and sedimentation distribution of stilling basin, which has significant application research value and promotion significance.
Highlights
As an important energy dissipating facility of hydraulic structure, the safe operation and long-term stability are essential to ensure the power generation and flood discharge of a hydropower station [1,2,3]
With the development of information, automation control, and surveying and mapping technology, underwater survey is more and more integrated, refined, and standardized. e combination of Global Positioning System-Real Time Kinematic (GPS-RTK) and depth sounder is an important technical method of modern underwater topographic survey. e combined technology was integrated with unmanned surface vehicle (USV) technology to construct an unmanned survey system which can greatly reduce the labor intensity and improve the automation degree and work efficiency of survey
In view of the urgent need for underwater sedimentation measurement in the Tingzikou, and the limitations of the existing surveying methods, the intelligent USV system carrying single beam bathymetry is adopted in the research, which can replace the manual measurement without drainage. rough this method, the bottom sedimentation distribution data and monitoring data on the high precision positions are collected. is research method can support the further structural safety assessment and normal operation of the stilling basin
Summary
As an important energy dissipating facility of hydraulic structure, the safe operation and long-term stability are essential to ensure the power generation and flood discharge of a hydropower station [1,2,3]. Erefore, the underwater topographic survey and underwater sedimentation detection of the stilling basin during the operation period are important parts of the routine inspection work for hydraulic structure and are the key to timely grasp the risk and hidden dangers of energy dissipation and to evaluate the safety status of the water discharge stricter of the power station. Is research is an application innovation of frontier surveying and mapping technology effectively applied in the field of water conservancy and hydropower engineering It meets the requirements for hydropower development and puts forward new requirements for digital watersheds, digital hydropower, and “Internet+” smart hydropower stations. In view of the urgent need for underwater sedimentation measurement in the Tingzikou, and the limitations of the existing surveying methods, the intelligent USV system carrying single beam bathymetry is adopted in the research, which can replace the manual measurement without drainage. In view of the urgent need for underwater sedimentation measurement in the Tingzikou, and the limitations of the existing surveying methods, the intelligent USV system carrying single beam bathymetry is adopted in the research, which can replace the manual measurement without drainage. rough this method, the bottom sedimentation distribution data and monitoring data on the high precision positions are collected. is research method can support the further structural safety assessment and normal operation of the stilling basin
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