| WANG Chu,YAO Dongjing,HE Baogen,ZHOU Naisheng,XU Shiyuan. 2010. Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China. Acta Oceanologica Sinica, (6):62－72 |
| Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China |
| Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China |
| Received:September 17, 2010 Revised:October 10, 2010 |
| DOI：10.1007/s13131-010-0077-0 |
| Key words:current velocity suspended sediment content flux salt marsh eastern beach |
| 中文关键词: current velocity suspended sediment content flux salt marsh eastern beach |
| 基金项目:The National Natural Science Foundation of China under contract Nos 40901010 and 40730526; Leading Academic Discipline Project of Shanghai Normal University under contract No. DZL809. |
| Author Name | Affiliation | E-mail | | WANG Chu | Department of Geography, Shanghai Normal University, Shanghai 200234, China | chuwang@shnu.edu.cn | | YAO Dongjing | Department of Geography, Shanghai Normal University, Shanghai 200234, China | | | HE Baogen | Department of Geography, Shanghai Normal University, Shanghai 200234, China | | | ZHOU Naisheng | Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China | | | XU Shiyuan | Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China | |
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| Abstract: |
| Between April 2002 and April 2003, in situ measurements of water depth, current velocity and suspended sediment content were carried out in edge region of East Chongming salt marsh and neighboring bald flat in the Changjiang (Yangtze) Estuary under different weather conditions. Cross-shore suspended sediment flux was calculated and analyzed. The results show that under calm weather conditions, the current velocity process in bald field and salt marsh area varied differently during semidiurnal tidal cycles. Owing to current velocity asymmetry, mean SSC during flood tide phase was 1.8 times higher than that of ebb tide phase. As a result, net onshore sediment flux controlled cross-shore suspended sediment transport process and salt marsh pioneer zone was generally accreting. There was significant positive correlation between total sediment flux and quartic power of maximum water depth. It indicates that tidal ranges dominate suspended sediment transport and sedimentation process in the salt marsh pioneer zone under the calm weather condition. The sedimentation rate on the adjacent mudflat was higher than the salt marsh, which induced stable accreting of salt marsh towards the sea. The wind events enhanced SSC and current velocity during the semidiurnal tides. And the remarkable onshore net sediment flux could occur on the high marsh and mudflat close to the marsh fringe during the short period under the rough weather condition. |
| 中文摘要: |
| Between April 2002 and April 2003, in situ measurements of water depth, current velocity and suspended sediment content were carried out in edge region of East Chongming salt marsh and neighboring bald flat in the Changjiang (Yangtze) Estuary under different weather conditions. Cross-shore suspended sediment flux was calculated and analyzed. The results show that under calm weather conditions, the current velocity process in bald field and salt marsh area varied differently during semidiurnal tidal cycles. Owing to current velocity asymmetry, mean SSC during flood tide phase was 1.8 times higher than that of ebb tide phase. As a result, net onshore sediment flux controlled cross-shore suspended sediment transport process and salt marsh pioneer zone was generally accreting. There was significant positive correlation between total sediment flux and quartic power of maximum water depth. It indicates that tidal ranges dominate suspended sediment transport and sedimentation process in the salt marsh pioneer zone under the calm weather condition. The sedimentation rate on the adjacent mudflat was higher than the salt marsh, which induced stable accreting of salt marsh towards the sea. The wind events enhanced SSC and current velocity during the semidiurnal tides. And the remarkable onshore net sediment flux could occur on the high marsh and mudflat close to the marsh fringe during the short period under the rough weather condition. |
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