关键词: 水位变化, 水位流量关系, 冲刷, 补水, 统计分析, 枯水期, 三峡水库

Abstract: Since the Three Gorges Project was put into operation, the water discharged from the reservoir caused scouring in the downstream river channel. At the same time, the supplement discharge from the reservoir to the lower reaches increased the downstream water level and average flow during dry season, and improved the downstream supplement situation. According to the data of water levels, discharges and cross-sections of the Yichang, Zhicheng, Shashi, Luoshan, Hankou, Datong stations, as well as the optimal operation scheme of the Three Gorges Reservoir, the rating curve of these stations after TGP's operation is analyzed to quantitatively study the effects of supplement discharge and scouring of water discharge on the water level along the downstream of the dam site in the dry season. The results show that the water level at the stations in Yichang - Hankou reach has been reduced in different degrees under different discharge conditions after the Three Gorges Reservoir was impounded. The monthly average water level at these stations has rose or fell considering the supplement discharge and scouring effects in dry season.

Key words: water-level fluctuation, rating curve, dry season, scouring, supplement discharge, Three Gorges Reservoir