| Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China |
| |
| 作者姓名： | WANG Chu YAO Dongjing HE Baogen ZHOU Naisheng XU Shiyuan |
| |
| 作者单位： | Department of Geography, Shanghai Normal University, Shanghai 200234, China,Department of Geography, Shanghai Normal University, Shanghai 200234, China,Department of Geography, Shanghai Normal University, Shanghai 200234, China,Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China,Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China |
| |
| 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. |
| |
| 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.
|
| 关 键 词： | 盐沼湿地 泥沙通量 中国东部 河口湿地 崇明 悬浮 天气条件 流速变化 |
| 收稿时间： | 2010/9/17 0:00:00 |
| 修稿时间： | 2010/10/10 0:00:00 |
Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China |
| |
| WANG Chu,YAO Dongjing,HE Baogen,ZHOU Naisheng,XU Shiyuan.Cross-shore suspended sediment flux in the salt marsh pioneer zone of Chongming eastern beach in the Changjiang Estuary in China[J].Acta Oceanologica Sinica,2010,29(6):62-72. |
| |
| Authors: | WANG Chu YAO Dongjing HE Baogen ZHOU Naisheng and XU Shiyuan |
| |
| Institution: | 1.Department of Geography, Shanghai Normal University, Shanghai 200234, China2.Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China |
| |
| 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. |
| |
| Keywords: | current velocity suspended sediment content flux salt marsh eastern beach |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
|
