关键词: 水下地形, 数字高程模型, 冲刷淤积

Abstract: As the reconstruction of ship lock, the underwater topography has changed significantly. Obtaining high-precision deposition-erosion data is critical as it has a direct effect on safety and maintenance of water conservancy facilities. Based on the digital elevation model (DEM) established with underwater terrain data in 2012 and 2016, this paper has realized quantization and visualization of sediment transport. The result shows that the proportion of deposition and erosion area is almost the same. The deposition is about 2.127 8 million cubic meters, occupying 39.93% of the total area, mainly distributed over the land areas. While sediment erosion is the major phenomena for underwater area. The amount reaches 2.962 3 million cubic meters, occupying 52.58%.

Key words: underwater topography, digital elevation model, erosion and deposition