Analysis of erosion and deposition evolution of inshore shoals and channels along the Jinshanzui to Longquangang segment in the northern Hangzhou Bay

FENG Lingxuan; JI Yongxing; ZHANG Xinyao; DAI Zhijun

doi:10.3969/j.issn.1001-909X.2020.03.010

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Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (3) : 92-98. DOI: 10.3969/j.issn.1001-909X.2020.03.010

Analysis of erosion and deposition evolution of inshore shoals and channels along the Jinshanzui to Longquangang segment in the northern Hangzhou Bay

FENG Lingxuan¹, JI Yongxing¹, ZHANG Xinyao², DAI Zhijun^*2

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Abstract

Taking Jinshanzui-Longquangang marginal shoal in the northern Hangzhou Bay as the study area, based on the measured and chart data from 1989 to 2014, we analyzed the topographic change of beach section and the variation characteristics of erosion and deposition of regional beach section along the Jinshanzui to Longquangang(JSZ-LQG) segment. The results showed that during study period there was relative stable eroded deepen channel in the study area, and the scouring and silting of the nearshore seabed showed a "fluctuating" law. The shallow area above 5 m water depth(2014) presented accreted patterns, meanwhile, seabed below 5 m water depth(2014) showed a general scouring trend since 1989. Moreover, variation of sediment discharge into the Yangtze River is an influencing factor of erosion/deposition in the study area. The typhoon waves, movement of the erosion and accretion sand body induced complexity in erosion and accretion in seabed of the JSZ-LQG segment.

Key words

seashores erosion and deposition / shoal-channel evolution / north bank of Hangzhou Bay

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FENG Lingxuan, JI Yongxing, ZHANG Xinyao, DAI Zhijun. Analysis of erosion and deposition evolution of inshore shoals and channels along the Jinshanzui to Longquangang segment in the northern Hangzhou Bay[J]. Journal of Marine Sciences. 2020, 38(3): 92-98 https://doi.org/10.3969/j.issn.1001-909X.2020.03.010

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