| 基于GOCI影像的半月潮周期内渤海悬浮泥沙浓度变化研究 |
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| 引用本文： | 李阳东,胡佳杰,吴珍瑜.基于GOCI影像的半月潮周期内渤海悬浮泥沙浓度变化研究[J].海洋通报,2021(3). |
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| 作者姓名： | 李阳东 胡佳杰 吴珍瑜 |
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| 作者单位： | 上海海洋大学 海洋科学学院，上海 201306；农业农村部大洋渔业开发重点实验室，上海 201306；大洋渔业资源可持续开发教育部重点实验室，上海 201306；上海市河口海洋测绘工程技术研究中心，上海 201306 |
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| 基金项目： | 国家自然科学基金 （41506211）；国家重点研发计划 （2019YFD0901404） |
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| 摘 要： | 悬浮泥沙浓度(SSC)的变化对渤海海域的生态等有着重要的影响。本文基于已有表层水体SSC遥感反演算法进行了优化,利用较高时空分辨率的GOCI影像,基于优化后的模型对渤海表层水体的SSC浓度在半月潮周期中的时空分布与变化特征进行了研究。结果表明:(1)渤海各海湾表层水体SSC在半月潮周期内的变化规律存在差异。从小潮到大潮,辽东湾和渤海湾表层水体SSC先减小后增加,而莱州湾及黄河口附近海域的SSC则呈现出逐步降低的趋势。(2)渤海表层水体SSC存在明显的日内变化,且半月潮潮情对渤海SSC的变化作用显著。在一个连续潮周期中,除莱州湾和辽东湾外,渤海海域SSC的变化幅度总体上呈现出大潮时较大、平常潮次之、小潮时较小的特征。(3)渤海海域沿岸浅水区的SSC高于中部深水区,同时渤海海峡西北部脊沟区水体的SSC变化系数表现出与局部地形相似的辐射状的空间分布特征且与水深存在显著的负相关性,说明海底地形对SSC的空间变化具有不可忽略的影响。
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| 关 键 词： | GOCI 渤海海域 悬浮泥沙浓度 水色遥感 大小潮 |
| 收稿时间： | 2020/11/21 0:00:00 |
| 修稿时间： | 2021/2/5 0:00:00 |
Variation of suspended sediment concentration in the Bohai Sea during the fortnightly tide period based on GOCI images |
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| LI Yangdong,HU Jiajie,WU Zhenyu.Variation of suspended sediment concentration in the Bohai Sea during the fortnightly tide period based on GOCI images[J].Marine Science Bulletin,2021(3). |
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| Authors: | LI Yangdong HU Jiajie WU Zhenyu |
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| Institution: | College of Marine Sciences, Shanghai Ocean University, Shanghai 201306; Key Laboratory of Oceanic Fisheries Exploration, Ministry of Agriculture and Rural Affaires, Shanghai 201306, China; Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China; Shanghai Engineering Research Center of Estuarine and Oceanographic Mapping, Shanghai 201306, China |
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| Abstract: | The change of suspended sediment concentration (SSC) has an important impact on the ecology of the Bohai Sea.This paper optimized the existing surface water SSC remote sensing inversion algorithms. The GOCI images with higher spatial and temporal resolution were then used to study the temporal and spatial distribution and variation characteristics of the SSC in the Bohai Sea surface water during the fortnightly tide cycle. The results show that: (1) there are differences in the variation of surface water SSC in the different bays of the Bohai Sea during the fortnightly tidal cycle. From neap tide to spring tide, SSC in the Liaodong Bay and the Bohai Bay first decreases and then increases, while that in the Laizhou Bay and the Yellow River Estuary shows a trend of decreasing. (2) The SSC of surface water in the Bohai Sea has obvious intra-day variation, and the fortnightly tide regime has a significant effect on the change of SSC in the Bohai Sea. In a continuous tidal cycle, except the Laizhou Bay and the Liaodong Bay, the variation of SSC in the Bohai Sea is generally characterized by larger in spring tide, second in normal tide and smaller in neap tide. (3) The SSC in shallow coastal waters of the Bohai Sea is higher than that in central deepwaters, and the SSC variation coefficient in the northwestern area of the Bohai Strait shows a radial spatial distribution similar to the local topography and is negatively correlated with corresponding water depth,indicating that the seabed topography has a significant influence on the spatial variation of SSC |
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| Keywords: | GOCI Bohai Sea suspended sediment concentration ocean color remote sensing spring-neap tides |
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