关键词: 水位变化, 水面落差, 河道冲刷, 皇庄河段, 汉江

Abstract: During the autumn flood period of the Hanjiang River in 2017, the water level at Huangzhuang Station rose under the same discharge, which greatly influenced the flood control situation of the reach. So this paper analyzes the measured data of Huangzhuang reach from 2000 to 2017, including the water level variation characteristics, the water surface fall, erosion-deposition variation and the influence of nearby project construction. According to the water level analysis results, the high water level in Huangzhuang reach rose 1.47 m and the middle water level rose 0.13 m in 2016~2017 compared with 2000~2015. In the low water period, the water level in 2016~2017 was basically the same as that in 2010~2015, but it was reduced by 0.28~0.41m compared with 2000~2009. According to the water surface fall analysis results, in Zhuandouwan to Huangzhuang reach, the water surface fall decreased; in Huangzhuang to Datong reach, the water surface fall increased greatly when the flow was above 5000m3/s and decreased in other periods and flow conditions in 2016~2017; in Datong~Shayang reach, the water surface fall decreased greatly when the flow was below 5 000 m3/s in 2014~2015. According to the analysis of scour and siltation of the fixed cross-section in Nianpanshan to Maliang reach, the whole reaches showed a scouring trend and some of the sections were silted. The measured water level near the bridge showed that the water surface fall near the bridge position was large. All above, the decrease of low water level was mainly due to the overall scour of the river course, which increased the overflow capacity, while the increase of middle and high water level were mainly caused by the influence of the bridge construction and the siltation of local reach.

Key words: water-level fluctuation, water surface fall, river channel erosion, Huangzhuang Reach, Hanjiang River