Wind impacts on suspended sediment transport in the largest freshwater lake of China
Poyang Lake, the largest freshwater lake in China, is distinguished by complicated suspended sediment (SS) dynamics. Apart from lake currents, wind is an important form of natural disturbance in driving SS transport. Combining field data, laboratory experiments, and numerical simulations, we gained...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2020-08-01
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| Series: | Hydrology Research |
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| Online Access: | http://hr.iwaponline.com/content/51/4/815 |
| _version_ | 1818191805223534592 |
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| author | Hua Wang John Paul Kaisam Dongfang Liang Yanqing Deng Yuhan Shen |
| author_facet | Hua Wang John Paul Kaisam Dongfang Liang Yanqing Deng Yuhan Shen |
| author_sort | Hua Wang |
| collection | DOAJ |
| description | Poyang Lake, the largest freshwater lake in China, is distinguished by complicated suspended sediment (SS) dynamics. Apart from lake currents, wind is an important form of natural disturbance in driving SS transport. Combining field data, laboratory experiments, and numerical simulations, we gained valuable insight into wind impacts on SS dynamics in Poyang Lake. (1) Lake current patterns exert great influence on the level of wind impacts. Due to reduced sediment carrying capacity, SS under weak current suffers from stronger wind influence than under strong currents. (2) Wind speed determines the degree of wind impact, not only affecting horizontal SS transport, but also regulating vertical dynamics. Winds exceeding critical intensity can enhance horizontal transport through both surface drift and Stokes drift at different water depths, triggering sediment suspension to feed the loads in overlying water. (3) Wind impact is influenced by lake morphology. The broad water surface in the central lake permits formation of continuous waves, leading to the largest SS fluctuation, from −10.05 mg·L−1 to +20.17 mg·L−1, while average variation in the south and north part of the lake is only −6.59 mg·L−1 to +10.36 mg·L−1. (4) SS in four reserves are characterized by notable wind impact, while in the other two reserves SS show no obvious departure from values without wind. |
| first_indexed | 2024-12-12T00:20:26Z |
| format | Article |
| id | doaj.art-4605c1691558401fb447d3aa2ad38362 |
| institution | Directory Open Access Journal |
| issn | 1998-9563 2224-7955 |
| language | English |
| last_indexed | 2024-12-12T00:20:26Z |
| publishDate | 2020-08-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Hydrology Research |
| spelling | doaj.art-4605c1691558401fb447d3aa2ad383622022-12-22T00:44:44ZengIWA PublishingHydrology Research1998-95632224-79552020-08-0151481583210.2166/nh.2020.153153Wind impacts on suspended sediment transport in the largest freshwater lake of ChinaHua Wang0John Paul Kaisam1Dongfang Liang2Yanqing Deng3Yuhan Shen4 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China and College of Environment, Hohai University, Nanjing 210098, China Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China and College of Environment, Hohai University, Nanjing 210098, China Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK Hydrology Bureau of Jiangxi Province, Nanchang 330002, China Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China and College of Environment, Hohai University, Nanjing 210098, China Poyang Lake, the largest freshwater lake in China, is distinguished by complicated suspended sediment (SS) dynamics. Apart from lake currents, wind is an important form of natural disturbance in driving SS transport. Combining field data, laboratory experiments, and numerical simulations, we gained valuable insight into wind impacts on SS dynamics in Poyang Lake. (1) Lake current patterns exert great influence on the level of wind impacts. Due to reduced sediment carrying capacity, SS under weak current suffers from stronger wind influence than under strong currents. (2) Wind speed determines the degree of wind impact, not only affecting horizontal SS transport, but also regulating vertical dynamics. Winds exceeding critical intensity can enhance horizontal transport through both surface drift and Stokes drift at different water depths, triggering sediment suspension to feed the loads in overlying water. (3) Wind impact is influenced by lake morphology. The broad water surface in the central lake permits formation of continuous waves, leading to the largest SS fluctuation, from −10.05 mg·L−1 to +20.17 mg·L−1, while average variation in the south and north part of the lake is only −6.59 mg·L−1 to +10.36 mg·L−1. (4) SS in four reserves are characterized by notable wind impact, while in the other two reserves SS show no obvious departure from values without wind.http://hr.iwaponline.com/content/51/4/815numerical experimentpoyang lakeshear stresssuspended sedimentwind |
| spellingShingle | Hua Wang John Paul Kaisam Dongfang Liang Yanqing Deng Yuhan Shen Wind impacts on suspended sediment transport in the largest freshwater lake of China Hydrology Research numerical experiment poyang lake shear stress suspended sediment wind |
| title | Wind impacts on suspended sediment transport in the largest freshwater lake of China |
| title_full | Wind impacts on suspended sediment transport in the largest freshwater lake of China |
| title_fullStr | Wind impacts on suspended sediment transport in the largest freshwater lake of China |
| title_full_unstemmed | Wind impacts on suspended sediment transport in the largest freshwater lake of China |
| title_short | Wind impacts on suspended sediment transport in the largest freshwater lake of China |
| title_sort | wind impacts on suspended sediment transport in the largest freshwater lake of china |
| topic | numerical experiment poyang lake shear stress suspended sediment wind |
| url | http://hr.iwaponline.com/content/51/4/815 |
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