Application Of Multibeam Bathymetry System Surported By CORS In Surveying Reservoir Sedimentation

The underwater topographic survey in the reservoir area is an important basic work for obtaining underwater topographic data,updating the reservoir's underwater topographic maps,and ensuring reservoir flood prevention,power generation,and shipping safety.The traditional cross-section measurement method is difficult to fully reflect the true situation of the reservoir's underwater terrain.With the progress of surveying and measurement technology and measurement equipment,multi-beam sounding system becomes the first choice for underwater topography measurement due to its high accuracy,high efficiency,and full coverage.In the face of the need for siltation measurements in mountainous reservoirs,this paper has conducted a joint application study of high-precision positioning technology CORS and multi-beam sounding technology.The main research work is as follows:(1)Research on underwater terrain information acquisition technology supported by CORS systemThe underwater topography measurement and sedimentation measurement are essentially the same,and both measure the plane position and elevation of a point on the water bottom.The underwater topographic survey mainly includes positioning and sounding,where the position of a point on the bottom of the water is given by positioning technology,and the depth data is used to measure the depth data to obtain the elevation of a certain point of the bottom of the water through the water level data.On the one hand,the establishment of a three-dimensional baseline for underwater topographic surveys based on the CORS system is studied to ensure the unity and stability of the measurement benchmarks for large-scale reservoir areas.On the other hand,in order to ensure that the measurement results are consistent with the historical measurement results coordinate system,the conversion relationship between the CORS system coordinate system and the reservoir area coordinate system is studied.Finally,on the basis of the foregoing,according to the characteristics of the CORS system and the characteristics of the sounding system,an integrated automated sounding system method for CORS measurement information,echo sounding information,navigation information,and measurement accuracy evaluation under CORS was developed.(2)Research on High Accuracy Storage Capacity Calculation Method Based on Point Cloud DataAiming at problems such as cumbersome calculation of reservoir sedimentation and cumbersome management of the datas,the ArcGIS Engine-based reservoir capacity calculation system based on reservoir sedimentation measurement history data and multi-beam sounding data was developed,including reservoir capacity calculation,sedimentation map drawing and other information analysis.The system allows managers to manage this information more conveniently and efficiently,providing support for rapid and scientific management of siltation measurement information in the reservoir area.The system is based on the underwater terrain cloud data,and on the basis of constructing the TIN model of underwater terrain in the reservoir area,the reservoir capacity calculation at any water level and cross-sectional siltation analysis are realized.