Abstract
Abstract. The 2017 Hanjiang autumn flood appeared to have higher surface water levels at the same discharge rate than previously at the Huangzhuang gauging station. It is seriously impacted the flood control. This paper analyses the 2000–2017 data from the Huangzhuang reach in the Hanjiang River, including surface water levels, the surface water fall, erosion-deposition variation and the engineering activities. A comparison of the 2016–2017 data with the 2000–2015 data in the Huangzhuang reach, revealed that the surface water levels were about 1.47 and 0.13 m higher in the high and intermediate discharge ranges, respectively. In the low discharge range, the 2016–2017 and 2010–2015 surface water levels were similar. However, a comparison of the 2016–2017 with the 2000–2009 data in the low discharge range, shows that the surface water levels were 0.28–0.4 m lower. The surface water fall in the Zhuandouwan–Huangzhuang's reach decreased in 2016–2017 for discharges above 5000 m3 s−1, whereas in the Huangzhuang–Datong reach the opposite was found. For other time periods and discharge ranges the fall decreased. In the Datong-Shayang reach the fall reduced in 2014–2015 relative to other periods in 2000–2017 in the discharge range above 5000 m3 s−1. The erosion-silting analysis for the Huangzhuang reach showed scouring of local river deposits due to bridge engineering. However, near the bridge the substantial silting was found. The collated surface water level and scouring-silting data suggest that reduced surface water levels during low discharge are mainly due to the overall river erosion. The increased surface levels in the high discharge range are due to local river siltation, especially because of the increased water resistance as response to bridge engineering.
Highlights
The Hanjiang River is a large tributary of the Yangtze River and has its confluence near Wuhan (China)
Xia et al (2006) analyzed the flood characteristics of the autumn flood of the Hanjiang River in 2005, which was was characterized by a large flood volume, but this had a high flood peak
The impact of the Highway No 2 bridge project, which included damming near the bridge, on the water level of the Huangzhuang reach was analyzed according to the changing relationship of water level and the discharge Han
Summary
The Hanjiang River is a large tributary of the Yangtze River and has its confluence near Wuhan (China). Xia et al (2006) analyzed the flood characteristics of the autumn flood of the Hanjiang River in 2005, which was was characterized by a large flood volume, but this had a high flood peak. Wang et al (2017) have studied the hydrological characteristics of the lower reach, and Feng et al (2016) have analyzed the impact of discharge variation on the state of the middle and lower reaches of the Hanjiang River. During the autumn flood of the Han River in 2017, the actual hydrological measurements indicate that the observed water level of the Huangzhuang station was a bit high for the discharge at that time. The impact of the Highway No 2 bridge project, which included damming near the bridge, on the water level of the Huangzhuang reach was analyzed according to the changing relationship of water level and the discharge Han
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