基于GOCI图像的长江口及邻近海域散射衰减系数反演及其在机载激光测深预估中的应用

Jiaxing Chen, Xiaoyu Zhang, Guorong Huang
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引用次数: 2

摘要

由于长江口及邻近海域浑浊度高、初级生产力高、水动力条件复杂、潮汐效应大,因此监测扩散衰减系数的动态变化对水下光探测和水下地形地貌激光观测具有重要意义。本文利用GOCI资料对长江口及其邻近海域进行了$K_{d}\(490)$反演。研究了长江口及邻近海域半潮期K_{d}\(490)$的各种特征及其影响因素。根据$K_{d}\(490)$的变化特征,评价了在海域进行激光测深的可行性。结果表明:1)长江口及其邻近海域为典型的II型水体。杭州湾最大悬沙含量可由1000 mg/L迅速降至10 mg/L以下。2)反演结果表明,长江口及其邻近海域的$K_{d}\(490)$在$0.10 \pm 0.02 {\mathrm {m}}^{-1} ~ 2.8 \pm 0.2 {\mathrm {m}}^{-1}$范围内变化,且随着离岸距离的减小,在河口内增大后减小。长江口及其邻近海域的$K_{d}\(490)$值一般在退潮期低于涨潮期。低潮期悬沙浓度和潮位是影响$K_{d}\(490)$值的重要因素;3)低潮期,长江口和杭州湾的激光探测深度在5 ~ 30 m之间,更适合在低潮处进行激光雷达观测。可以看出,GOCI的日分辨率为每小时8个场景,可以实现$K_{d}\(490)$的动态变化监测。该研究为机载激光雷达探测技术的进一步发展提供了技术支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Diffuse Attenuation Coefficient Inversion for the Yangtze Estuary and Its Adjacent Sea Areas on the GOCI Images and Application in the Preevaluation of Airborne Laser Bathymetry
Due to high turbidity, high primary productivity, complex hydrodynamic conditions, and tidal effects, monitoring the dynamic changes of diffuse attenuation coefficient is of great significance for underwater light detection and laser observation of underwater topography and landforms in the Yangtze Estuary and adjacent waters. In this study, the $K_{d}\ (490)$ inversion in the Yangtze Estuary and its adjacent sea areas is carried out based on GOCI data. The research focused on the various characteristics and influencing factors of $K_{d}\ (490)$ in the Yangtze Estuary and its adjacent sea areas during half tidal period. The feasibility of laser sounding in the sea areas is evaluated according to the variation characteristics of $K_{d}\ (490)$. The result indicates that:1) The Yangtze Estuary and its adjacent waters are typical type II water. The maximum suspended sediment content can be rapidly reduced from 1000 mg/L in Hangzhou Bay to below 10 mg/L. Therefore, the piecewise diffuse attenuation coefficient inversion algorithm is suitable for the study area;2) The inversion results suggest that the $K_{d}\ (490)$ of the Yangtze Estuary and its adjacent sea areas vary in the range of $0.10 \pm 0.02 {\mathrm {m}}^{-1}-2.8 \pm 0.2 {\mathrm {m}}^{-1}$, and increases in the inner estuary and then decreases with the decrease of offshore distance. The $K_{d}\ (490)$ values of the Yangtze Estuary and its adjacent sea areas are generally lower in low tide period than in high tide period. The suspended sediment concentration and the tidal level are important factors affecting $K_{d}\ (490)$ values in the low tide period; 3) During the low tide period, the detectable laser depth in the Yangtze Estuary and Hangzhou Bay is from less than 5 m to 30 m, which is more suitable for LiDAR observation at the lowest tide level. It can be seen that GOCI’s daily resolution of 8 scenes per hour can realize the dynamic change monitoring of $K_{d}\ (490)$. The research provides technical support for the further development of airborne LiDAR detection.
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