One of the characteristics of Korea's summer season is that about 70% of annual rainfall is concentrated during the flood season. When looking at the characteristics of annual precipitation, the seasonal variation in precipitation is so severe that on...
One of the characteristics of Korea's summer season is that about 70% of annual rainfall is concentrated during the flood season. When looking at the characteristics of annual precipitation, the seasonal variation in precipitation is so severe that one of the objectives of the water resource policy is to secure water in the flood season and the amount of water available in the dry season. Accordingly, large and small dams and reservoirs have been built across the country to secure water for living, industrial and agricultural use. There are a total of 17,000 dams and reservoirs nationwide, of which 80% of medium and small reservoirs are managed by local governments, so economical and efficient in maintaining and managing a large number of reservoirs is low. In order to improve the above problems, the purpose of this study was to establish basic data for various projects such as more efficient identification of reservoir contents and reservoir dredging by utilizing aerial and ship drones (high-precision IMU) and GNSS. The survey site adopted to conduct research on the establishment of a multipurpose reservoir management system was selected as Tanbu Reservoir located in Chuncheon City. Reservoir data were acquired using aerial and ship drones and GNSS. First, the aerial drone uses the'MAVIC2 PRO' equipment, and it is possible to minimize distortion by acquiring images of uniform resolution on the topography of a reservoir with severe topographical undulations. It can be used as data to grasp the change in topography when filming in the same area a year later. In the case of unmanned water depth surveying, the “Marine 7” equipment was used, and the installed multi-beam is expressed as a depth value by calculating the depth by using the difference in wavelength of the sound wave reflected by the sound wave hitting a certain object. In addition, by interlocking with the GNSS receiver, the location information of the depth value can be expressed within ±1cm of X,Y errors, and depth surveying is possible at equal intervals using the high-precision automatic navigation system (IMU) in the ship drone. Each point cloud data can be acquired using the equipment described so far.The acquired point cloud set of ship drones and aerial drones is integrated into a point cloud in one coordinate system, and the topographic map and depth of the reservoir are analyzed through data analysis. Figures, longitudinal sectional views, cross sectional views, and capacity could be grasped. As a result of collecting and calculating the obtained data, the area of the reservoir was 29,829.19 and the amount of water stored was 227,768. In the case of fusion with the results of unmanned land and sea observations, it is possible to construct unified topographic data at depth and land, and the analysis results of these data will be helpful for long-term development and management plans for reservoirs, lakes, and dam basins in the future. In that the reservoir is managed by local governments, it is judged that its utility will be diverse in that it can achieve higher economic efficiency by reducing manpower and costs.