基于无人机的用海项目施工期悬浮泥沙监测

为实现对用海项目施工期悬浮泥沙扩散的实时跟踪监测,尝试采用无人机携带可见光、多光谱传感器对古雷围填海项目的围堰区进行遥感探测。利用Pix4d软件对无人机携带的可见光及多光谱照片进行处理,结果表明,可见光及多光谱影像对水体中的悬浮泥沙分布均具有一定的识别能力。通过研究分析多光谱影像的光谱特征发现,近红外波段对悬浮泥沙含量的升高较为敏感,运用波段比值公式计算结果显示,围堰内含沙水体经溢流口排入海域后浓度明显降低,并可向南继续扩散约300 m。该方法可克服遥感卫星影像时空分辨率低的特点,为用海项目资源环境影响跟踪监测提供新的技术手段。

Monitoring Suspended Sediment during the Construction Period of Reclamation Projects Based on UAV

In order to track and monitor the diffusion of suspended sediment in the construction period of reclamation projects in real time, this study attempts to use UAV with visible light and multi-spectral sensors to detect the cofferdam area of Gulei reclamation project by remote sensing. Pix4d software is used to process visible light and multispectral photographs carried by UAV. The results show that both images can recognize the suspended sediment distribution in water body. By studying and analyzing the spectral characteristics of the sensor, it is found that the near infrared band is sensitive to the increase of suspended sediment content. The calculation results using the band ratio formula show that the suspended sediment concentration of the water in the cofferdam decreases significantly after discharging into the sea area, and continues to diffuse southward for 300m. This method can overcome the low spatial and temporal resolution of remote sensing satellite images, and provide a new technical means for tracking and monitoring the environmental impact of marine projects.