富春江电厂坝下水底2012～2016年间地形变化分析

Analysis on change of underwater topography of some parts of Fuchun river from 2012 to 2016

随着船闸扩建工程的开展,富春江电厂坝下水底地形变化显著,冲刷淤积量的计算精度直接影响了对水下地形变化的评估,甚至涉及对水利设施安全维护工作更好地把控。利用2012年、2016年富春江流域部分河段水下地形图为基础资料,分别建立数字高程模型并进行叠合分析,实现对泥沙输移的定量化和可视化。结果表明:2012~2016年间,流域冲刷区、淤积区所占比重相当;淤积量有212.78万m3,占整个区域的39.93%,主要分布在地势较高的岛屿以及坝址东岸船闸扩建工程区;水下则以泥沙冲刷为主要现象,冲刷量达296.23万m3,面积比例为52.58%。

As the reconstruction of ship lock,the underwater topography has changed significantly. Ob-taining high-precision deposition-erosion data is critical as it has a direct effect on safety and mainte-nance of water conservancy facilities. Based on the digital elevation model（DEM） established with un-derwater terrain data in 2012 and 2016,this paper has realized quantization and visualization of sedi-ment 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 distrib-uted over the land areas. While sediment erosion is the major phenomena for underwater area. Theamount reaches 2.962 3 million cubic meters,occupying 52.58%.