| 摘要: |
| 基于2003—2018年中分辨率成像光谱仪（moderate-resolution imaging spectroradiometer，MODIS）卫星遥感影像资料，结合2018年春季、夏季和冬季大面站悬浮体取样分析结果，构建了表层悬浮体浓度遥感反演模型；在此基础上，分析了山东半岛东北部海域年际和月份表层悬浮体浓度时空分布规律，探讨了表层悬浮体浓度变化的主控因素和水体结构季节变化及其对悬浮体分布输运的影响。结果表明：山东半岛东北部海域表层悬浮体总体呈近岸高远岸低的分布特征，东部成山头区域悬浮体浓度较高且向海扩散较远，西部威海湾及外侧海域悬浮体浓度较低且扩散范围小于东部。研究区悬浮体浓度季节性变化显著但对应季节年度变化较小，冬季悬浮体浓度达到最大，春秋季次之，夏季最低。研究区春季、秋季和冬季表层悬浮体浓度主要受控于北向风浪和潮流，而夏季悬浮体浓度主要受潮流控制。夏季，温跃层阻碍了悬浮体垂向扩散，导致表层悬浮体浓度极低；冬季，研究区东部成山头附近水平分布的弱温跃层虽然会在一定程度上抑制悬浮体的再悬浮，但再悬浮扩散仍是造成研究区高悬浮体浓度的主要因素。山东半岛东北部存在类似“夏储冬输”的特征，海底沉积物再悬浮物质及成山头附近悬浮体的水平扩散是研究区悬浮体的主要来源。 |
| 关键词: 山东半岛 遥感反演 悬浮体浓度 时空变化 |
| DOI：10.11693/hyhz20200900268 |
| 分类号: |
| 基金项目:国家自然科学基金“山东半岛海湾对泥沙的捕获机制—以威海湾为例”，41776059号。 |
附件 |
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| THE temporal and spatial variation of suspended matter in the northeast Shandong Peninsula based on remote sensing inversion |
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LIU Tao1, ZHU Long-Hai1,2, HU Ri-Jun1,2, YIN Yan-Jun1, LENG Xing1
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1.College of Marine Geoscience, Ocean University of China, Qingdao 266100, China;2.The Key Lab of Submarine Geoscience and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100, China
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| Abstract: |
| Based on the MODIS satellite remote sensing image data during 2003-2018 and the suspension sampling analysis results of at-sea-surface stations in spring, summer, and winter of 2018, a remote sensing inversion model for surface suspension concentration was constructed. The temporal and spatial distribution of surface suspension concentration in the sea area off northeast Shandong Peninsula was analyzed, and the main controlling factors of the variations in surface suspension concentration, seasonal water structure were examined, and their influence on the distribution and transport of suspended matter were discussed. Results show that the surface suspension in the study area is generally distributed near shore higher than far shore lower, the concentration of suspension in the eastern Chenshan area was higher and spread far to the sea, and the concentration of suspension in the western Weihai Bay and the outer sea area was lower and the diffusion range was smaller than that in the eastern sea. The concentration of suspended matter in the study area had a significant seasonal change, but the corresponding seasonal annual change was small. The concentration of suspended matter reached the maximum in winter, followed by spring and autumn, and the lowest in summer. The surface suspension concentration in spring, autumn, and winter was controlled mainly by northerly wind waves and tidal currents, while the concentration in summer was mainly controlled by tidal currents. In summer, the thermocline obstructed the vertical diffusion of suspension, resulting in extremely low surface suspension concentration. In winter, the weak thermocline distributed horizontally near Chenshan in the east of the study area, which inhibited the re-suspension to a certain extent, but the re-suspension diffusion was still the main factor for causing the high concentration of suspended matter in the study area. Similar characteristics of "summer storage and winter transport" exist in the northeastern part of Shandong Peninsula, and the horizontal diffusion of suspended matter in seabed sediments and near Chenshan were the main sources of suspended matter in the study area. |
| Key words: Shandong Peninsula remote sensing inversion suspension concentration time and space variation |
