Journal of Tropical Oceanography >
Erosion-deposition analysis of underwater slope on lagoon and sand barriers in the Swan Lake, Rongcheng, Shandong province
Copy editor: YAO Yantao
Received date: 2021-10-23
Revised date: 2021-11-14
Online published: 2021-11-21
Supported by
Natural Science Foundation of China-Shandong United Fund(U1706220)
National Natural Science Foundation of China(41901006)
Shandong Provincial Fund(ZR2019BD005)
Shandong University Youth Innovation Technology Team(2020KJH002)
The Swan Lake in Rongcheng of Shandong province is a typical lagoon-barriers system. Since 1980s, under the influence of human activities, the environmental system of the Swan Lake has changed with strong erosion of the sand dam. Studying the erosion and deposition of underwater bank slopes is of great significance for understanding the evolution of lagoon-sand dam system and protecting the environment of Swan Lake. This paper focus on the underwater bank slope of the sand dam at the east side of the Swan Lake. Based on the combination of chart data from 1960 to 2014 and geographic information technology, we have obtained multi-year water depth of the coastal waters on the east side of the Swan Lake since 1960, and analyzed the contour changes, scouring and silting changes and topographic changes of the set profile in the sand dam area on the east side of Swan Lake. The results show that the overall depth contours moved towards the sea from 1960 to 1980, while the tendency of contours moving towards the sea from 1980 to 2014 slowed down, the 0 m depth contour at the entrance of the tidal channel retreated 126.70 m to the shore from 1960 to 2014. The underwater bank slope of the Swan Lake was at a state of siltation from 1960 to 1980, the annual siltation rate is 3.60 cm·a-1. The erosion area increased significantly from 1980 to 2014, and the erosion and siltation phases were distributed, the annual siltation rate is 0.79 cm·a-1. The underwater bank slope of the Swan Lake sand dam is steep and gentle, and the north side of the tidal channel entrance is more likely to be eroded than the south side. Human activities have changed the environmental state of the Swan Lake, leading to partial erosion and retreat of the underwater bank slope of the Swan Lake.
Key words: Rongcheng Swan Lake; isobaths; underwater slope; erosion-deposition map
YU Jiankui , REN Zonghai , ZHAN Chao , ZHANG Yuchen , GENG Wenqian , WANG Qing . Erosion-deposition analysis of underwater slope on lagoon and sand barriers in the Swan Lake, Rongcheng, Shandong province[J]. Journal of Tropical Oceanography, 2022 , 41(4) : 61 -70 . DOI: 10.11978/2021141
表1 荣成湾及附近海域不同时期测量的海图Tab.1 Survey charts of the Rongcheng Bay and its nearby waters at different periods of time |
序号 | 区域 | 测量年份 | 比例尺 | 测量基准面 |
---|---|---|---|---|
1 | 荣成湾 | 1960 | 1:20000 | 理论深度基准面 |
2 | 威海湾至马他角 | 1960—1964 | 1:100000 | 理论深度基准面 |
3 | 成山头至苏山岛 | 1960—1964 | 1:100000 | 理论深度基准面 |
4 | 山东高角附近 | 1980 | 1:20000 | 理论最低潮面 |
5 | 荣成湾及附近 | 2014 | 1:15000 | 理论最低潮面 |
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