Study on recent bed changes of erosion and siltation in Yangtze River Estuary

Zhang Xiaohe; Li Jiufa; Zhu Wenwu; Cheng Heqin

doi:10.3969/j.issn.0253-4193.2015.03.014

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Zhang Xiaohe, Li Jiufa, Zhu Wenwu, Cheng Heqin. Study on recent bed changes of erosion and siltation in Yangtze River Estuary[J]. Haiyang Xuebao, 2015, 37(3): 134-143. doi: 10.3969/j.issn.0253-4193.2015.03.014

Citation:

Zhang Xiaohe, Li Jiufa, Zhu Wenwu, Cheng Heqin. Study on recent bed changes of erosion and siltation in Yangtze River Estuary[J]. Haiyang Xuebao, 2015, 37(3): 134-143. doi: 10.3969/j.issn.0253-4193.2015.03.014

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Study on recent bed changes of erosion and siltation in Yangtze River Estuary

doi: 10.3969/j.issn.0253-4193.2015.03.014

1. State Key Laboratory of Estuarine and Costal Research, East China Normal University, Shanghai 200062, China

Received Date: 2014-04-02

Abstract

Abstract

Based on the digital nautical charts since 1997 and recent hydrologic field observations,the variations of erosion and siltation in Yangtze River Estuary under the influence of artificial regulation engineerings and basin reservoirs are analyzed. The results indicate that since 1997,(1) the morphological features have been undergone by slightly erosion in upper estuary,(2) the mouth bar crest still received deposition and moved seaward,and (3) the nearshore seabed have been increasingly eroded. And the dominant cause on those phenomena has been changed from the original nature factors to recent intensive human activities. Firstly,the riverbed in South Branch (SB),South Channel (SC) and the upper and middle reaches of North Channel (NC) has been eroded overall. The sediment above bed was very active and surface sediment was coarsened. Bed surface sand wave was becoming more distinct,and the nearshore seabed outside river mouth is being eroded slightly. These variations mentioned above are attributed to river runoff and sediment load. Secondly,there was a sediment deposition in the reaches of North Brach (NB),the mouth of NC and the mouth bars of North Passage (NP) and South Passage (SP),especially for the main channel of NP,which matches a big quantity of back silting after the Deep Waterway Project. The reasons why caused these variations are not only changes in the dynamic structure in estuarine mouth bars,but also variations for the supply of sediment resuspension in local area and offshore area. In addition,the severe erosion and siltation in some reaches is closely related to those estuarine engineering constructions. In a word,the Yangtze River Estuary is in slow adjustment and adaptation under changing natural factors and intensive human activities recently.
- Yangtze River Estuary,
- geomorphic changes,
- human activities,
- tidal current,
- sediment transport

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References(28)

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