Morphodynamics of the Qiantang Estuary, China: Controls of river flood events and tidal bores

Xie, Dongfeng; Pan, Cunhong; Gao, Shu; Wang, Zheng Bing

doi:10.1016/j.margeo.2018.09.003

Cited by 36 publications

(23 citation statements)

References 34 publications

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“…The seasonal change in the amplification factor at Zakou is much larger than many other estuaries (Jalón-Rojas et al, 2018;Wang et al, 2019) where the correlation between the amplification factor at the upper estuary and the tidal range at the mouth is relative stable over decades. Furthermore, the tidal amplification is larger during spring tide than during neap tide (Figure 8), in agreement with the findings of Xie et al (2018) based on the monthly-averaged data since the 1980s. This is different from other tide-dominated estuaries such as the Guadalquivir Estuary in the Spain (Wang et al, 2014), Garonne tidal river in the France, (Jalón-Rojas et al, 2018), the Guadiana estuary in the Portugal (Garel and Cai, 2018) and the LingdingYang Bay in the Pearl River Estuary of China (Cai et al, 2020).…”

Section: Discussionsupporting

confidence: 90%

“…As water levels in the Qiantang Estuary are strongly influenced by the bed level changes, it is necessary to analyze firstly the bathymetrical changes. The morphological evolutions in 2015 have been reported by Xie et al (2018). They found that the dynamic equilibrium in the estuary is controlled by two extreme hydrographic conditions: tidal bore and river floods.…”

Section: Morphological Evolutionmentioning

confidence: 95%

“…The bed level change between July and November was opposite. Sediment accumulation and erosion occurred in the ZL reach and DG reach, respectively, because the tides, especially the tidal bore, can transport a large amount of sediment from the lower reach landward (Chen et al, 1990;Han et al, 2003;Xie et al, 2018). The channel volume over the ZL reach was 280 × 106 m 3 in November, indicating a decrease of 53 × 106 m 3 from July to November; whereas the channel volume over the DG reach was 2,565 × 106 m 3 in November, increased by 24 × 106 m 3 in the same period.…”

Section: Morphological Evolutionmentioning

confidence: 99%

“…It is one of the most morphologically active estuaries worldwide. Local bed level change in several months can be more than 5 m (Chen et al, 1990;Xie et al, 2018). It is also famous for the largest tidal bore worldwide (Bartsch-Winkler and Lynch, 1988;Chanson, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…It is also famous for the largest tidal bore worldwide (Bartsch-Winkler and Lynch, 1988;Chanson, 2012). The estuary has been the subject of a number of studies focusing on the provenance of the estuary (Chen et al, 1990;Zhang et al, 2014Zhang et al, , 2015, hydrodynamics and sediment transport (Pan and Huang, 2010;Xie and Pan, 2013;Fan et al, 2014Fan et al, , 2016Tu et al, 2021), the long-term morphodynamic evolutions as well as the morphological responses to human activities (Dai et al, 2014;Liu et al, 2017;Xie et al, 2017a, Xie et al, 2018, Xie et al, 2021a. Mainly based on the bathymetric and monthly-averaged tidal data in each april, July and November since the 1980s, Xie et al (2021b) recently found that the interannual natural morphological evolution of the estuary plays an important role on the tidal behaviors.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal Tidal Dynamics in the Qiantang Estuary: The Importance of Morphological Evolution

Xie

Wang

2021

Front. Earth Sci.

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Despite the increasing number of studies on the river-tide interactions in estuaries, less attention has been paid to the role of seasonal morphological changes on tidal regime. This study analyzes the seasonal interplay of river and tide in the Qiantang Estuary, China, particularly focusing on the influences of the active morphological evolution induced by the seasonal variation of river discharge. The study is based on the high and low water levels at three representative stations along the estuary and daily river discharge through 2015, an intermediate flow year in which a typical river flood occurred, as well as the bathymetric data measured in April, July and November, 2015. The results show strong seasonal variations of the water level in addition to the spring-neap variation. These variations are obviously due to the interaction between river discharge and tide but can only be fully explained by including the effect of morphological changes. Two types of the influences of the variation of the river discharge on the tidal dynamics in the estuary can be distinguished: one is immediately induced by the high flow and the other continues for a much longer period because of the bed erosion and the following bed recovery. Tidal range in the upper reach can be doubled after the flood because of bed erosion and then decrease under normal discharge periods due to sediment accumulation. Over a relatively short term such as a month or a spring-neap tidal cycle, there exist good relationships between the tidal range, tidal amplification in the upper reach and the tidal range at the mouth, and between the hydraulic head over the upper and lower reaches. Such relationships are unclear if all data over the whole year are considered together, mainly because of the active morphological evolution.

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