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在射阳河口,悬浮泥沙对拦门沙的位置的形状有很大的影响,而拦门沙是制约射阳港航运条件的主要因素。遥感手段具有分辨率高、范围大、连续性强、成本低等特点,在近岸悬浮泥沙监测中具有很大的应用潜力。Hyperion作为目前世界上唯一的民用高光谱传感器,与其它传感器相比又具有光谱分辨率高的优势。根据在射阳河口实测的光谱悬浮泥沙数据,利用逐步筛查的方法选择与表层悬浮泥沙浓度相关性高且物理意义明显的因子,发现离含沙水体光谱反射峰附近的605nm、810nm和715nm的反射率的组合因子与表层悬浮泥沙浓度相关性较高且物理意义明确,模型的拟合精度可达到65%以上。在此基础上,利用Hyperion影像进行表层泥沙浓度的反演。结果证明,该模型能够正确反映河口表层悬浮泥沙的分布规律。
In Sheyang estuary, the suspended sediment has a great influence on the shape of the sand bar and the sand bar is the main factor restricting the shipping conditions of Sheyang Harbor. Remote Sensing has the characteristics of high resolution, large range, strong continuity and low cost, which has great potential in the monitoring of suspended sediment in the coastal area. As the only civilian hyperspectral sensor in the world, Hyperion has the advantage of high spectral resolution compared with other sensors. According to the measured data of suspended sediment in Sheyang estuary, the factors which have high correlation with the suspended sediment concentration in the surface and obvious physical significance were selected by stepwise screening method. The results showed that the spectral reflectance at 605nm, 810nm and The correlation coefficient of 715nm reflectance with surface suspended sediment concentration is high and the physical meaning is clear. The fitting accuracy of the model can reach more than 65%. On this basis, the Hyperion image is used to invert the sediment concentration in the surface. The results show that the model can correctly reflect the distribution of suspended sediment in estuaries.