黄河三角洲北部近岸悬浮物季节性分布及驱动因素

近岸海域悬浮颗粒物的分布与扩散对水体生态环境、海岸地貌演变、水产养殖以及海岸工程等有重要影响。由于刁口河流路的改道，黄河三角洲北部成为强烈侵蚀岸段，揭示该区域的悬浮物浓度变化特征和规律是防护工程安全维护的基础。利用经良好检验的模型反演近岸海域悬浮物浓度，Landsat-8和Sentinel-2卫星影像反演结果的交叉验证表明，基于两种传感器反演的悬浮物浓度具有较强的一致性，两种卫星数据可以结合使用。研究区近岸海域悬浮物浓度季节变化明显，冬季和春季悬浮物浓度较高，夏季较低，秋季是悬浮物浓度从低向高转换的季节。冬、春季该区域风浪较大，在波浪掀沙和潮流输沙的联合作用下，底床泥沙强烈再悬浮，是形成悬浮物的主要来源，丁坝群的修建也在一定程度上改变了悬浮物的时空分布。

Seasonal distribution and driving forces of suspended particulate matter in the northern Yellow River Delta

The distribution and diffusion of suspended particulate matter (SPM) in coastal waters play an important role on ecological environment, coastal geomorphic evolution, aquaculture and coastal engineering. The northern Yellow River Delta is a strong coastal erosion area due to the diversion of Diaokou course. Revealing the variation characteristics and laws of SPM concentration in this area is the basis for maintaining the safety of protection projects. Using the well-validated model to retrieve the SPM concentration in the coastal waters, the cross validation results of Landsat-8 and Sentinel-2 satellite sensors show that the SPM concentrations retrieved by the two sensors have strong consistency, and the two kinds of satellite data can be used together. The seasonal variation of SPM concentration in the study area is obvious. The concentration of SPM is higher in spring and winter, and lower in summer. Autumn is the season when SPM concentration changes from low to high. In winter and spring, the wind and waves are large in this area. Under the combined action of waves and current, strong sediment resuspension occurs, which is the main source of SPM. The construction of spur dike group altered the spatial and temporal distribution of SPM to a certain extent.