| 近岸流系与长江入海悬浮泥沙输移扩散 |
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| 引用本文： | 李四海,恽才兴.近岸流系与长江入海悬浮泥沙输移扩散[J].海洋通报(英文版),2006,8(1):22-33. |
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| 作者姓名： | 李四海 恽才兴 |
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| 作者单位： | 1. 华东师范大学河口海岸国家重点实验室,上海,200062;国家海洋信息中心,天津,300171
2. 华东师范大学河口海岸国家重点实验室,上海,200062 |
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| 基金项目： | Thanks should go to Professor LIU Jianqiang, National Marine environment Forecast Center, and Professor YANG Xingwei, Meteorological Science Research Institute of Shanghai, for their satellite data. We also express our thanks to Professor LI Yan, the Second Institute of 0ceanography, for his help and instructions. |
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| 摘 要： | 通过两年较完整的序列 NOAA/AVHRR 数据和实测含沙量资料,利用考虑近岸Ⅱ类水体大气校正的泥沙定量反演算法,获得了较高精度的河口高浓度泥沙遥感反演模式;利用泥沙浓度分级图和反映流系特征的温度图象,系统分析了长江口悬浮泥沙扩散途径、范围及其与近岸流系的关系。影响长江入海悬浮泥沙扩散的近岸流系主要包括台湾暖流、黄海混合水、苏北沿岸流及浙江沿岸流等。冬季,近岸流系比较稳定,其配置状况在一定程度上影响着苏北沿岸泥沙流向长江口的扩散,并制约着入海悬浮泥沙的扩散途径;洪季,长江入海径流量是影响悬浮泥沙扩散的重要因子。同时,长江冲淡水、浙江沿岸流共同形成的冷水区与台湾暖流水之间锋面的强度,也对悬浮泥沙和冲淡水的扩散方向和范围有重要影响;春、秋两季入海悬浮泥沙的扩散型式分别向夏、冬季的分布格局过渡。此外,风应力显著影响着浑水区的扩散方向和范围。风浪掀沙引起的河口泥沙再悬浮,可使近岸泥沙扩散范围增大。
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| 关 键 词： | NOAA/AVHRR 长江口 入海悬浮泥沙 近岸流系 |
| 收稿时间： | 02 20 2006 12:00AM |
Coastal Current Systems and the Movement and Expansion of Suspended Sediment from Changjiang River Estuary |
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| LI Sihai,YUN Caixing.Coastal Current Systems and the Movement and Expansion of Suspended Sediment from Changjiang River Estuary[J].Marina Science Bulletin,2006,8(1):22-33. |
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| Authors: | LI Sihai YUN Caixing |
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| Institution: | 1. State Key Laboratory of Estuary and Coast Research, Shanghai 200062, China ;2. National Marine Data and Information Service, Tianjin 300171, China |
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| Abstract: | This paper , with NOAA/AHHRR data for 2 years, discusses the expanding path and extent of suspended sediment from the Changjiang River, and the relationship between the suspended sediment expanding and coastal current systems by analyzing the thermal infrared imagery with the sediment imagery, which is acquired by correlating the atmosphere corrected AVHRR imagery with in-situ suspended sediment data. The coastal current systems affecting the sediment dispersal mainly include: the Taiwan Warm Current (TWC), the Huanghai Sea Mixed Water (HSMW), North Jiangsu near-shore current, and Zhejiang near-shore current etc. In winter, the current systems are stable. Their distribution affects the sediment from north Jiangsu expanding toward the Changjiang estuary in some degree .The front between Zhejiang coastal current and TWC blocks the expanding of sediment toward the sea. In the flood season, apart from the limitation by coastal current systems, the spatial and temporal distribution of suspended sediment is also affected by the runoff, which shows as the jet stream and fresh water. Spring and autumn are the transitional periods of the forming of expanding patterns of flood season and winter respectively. In addition, the re-suspended sediment caused by the wind wave may make the expanding range of near-shore sediment larger. |
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| Keywords: | NOAA/AVHRR Changjiang estuary suspended sediment coastal current systems |
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