| Title |
Analysis of Water Surface Area Change in Reservoir Using Satellite Images |
| Authors |
김주훈(Kim, Joo-Hun) ; 김동필(Kim, Dong-Phil) |
| DOI |
https://doi.org/10.12652/Ksce.2024.44.5.0629 |
| Keywords |
위성영상; Sentinel-1(SAR-C); Sentinel-2(MSI); 수체면적; 저수량; 변화탐지 Satellite image; Sentinel-1(SAR-C); Sentinel-2(MSI); Water surface area; Water storage; Change detection |
| Abstract |
The purpose of this study is to monitor changes in the water surface of reservoirs in verifiable areas in Korea using satellite images and to analyze the water surface area and water storage. The target area of this study is the Daecheong dam of the Geumgang(Riv.), which supplies water to some areas in the Chungcheong area. A study was conducted to detect water surface area by using the Sentinel-1(SAR-C) image and the optical image of Sentinel-2(MSI) among the various observation sensors of satellite images. The correlation between the reservoir's water storage volume, which is ground measurement data, and the extracted water surface area was analyzed. As a result of the analysis, the coefficient of determination(R2) between water surface area and daily storage using SAR images was analyzed to be 0.9242, and in the analysis using Sentinel-2's MSI optical image, it was analyzed to be correlated at 0.8995. In addition, it is analyzed that the water storage volume of the water surface area extracted from the image using the relationship between the water storage volume and the water surface area represents a hydrograph similar to the actual water storage volume. This study is a basic study for the use of satellite images in unmeasured/non-access areas such as North Korea, and plans to conduct a study to analyze annual changes and long-term trends in major dam reservoirs in North Korea by reflecting the results obtained through this study. |