海南岛沿岸海域水体漫衰减系数光谱分析及LiDAR测深能力估算  

Analysis of Diffuse Attenuation Coefficient Spectra of Coastal Waters of Hainan Island and Performance Estimation of Airborne LiDAR Bathymetry

作　　者：丁凯[1,2] 李清泉[1,2] 朱家松[1,2] 汪驰升[1,2,3] 崔扬 管明雷[1,2] 王丹 樊星[4] DING Kai;LI Qing-quan;ZHU Jia-song;WANG Chi-sheng;CUI Yang;GUAN Ming-lei;WANG Dan;FAN Xing(Key Laboratory for Geo-Environment Monitoring of Coastal Zone of theNational Administration of Surveying,Mapping and Geoinformation,Shenzhen University,Shenzhen 518060,China;Shenzhen Key Laboratory of Spatial Smart Sensing and Services,Shenzhen University,Shenzhen 518060,China;Key Laboratory for National Geographic Census and Monitoring,National Administration of Surveying,Mapping and Geoinformation,Wuhan 430079,China;Teledyne Optech,Inc,Ontario L4K5Z8,Canada)

机构地区：[1]深圳大学海岸带地理环境监测国家测绘地理信息局重点实验室,广东深圳518060 [2]深圳大学空间信息智能感知与服务深圳市重点实验室,广东深圳518060 [3]地理国情监测国家测绘地理信息局重点实验室,湖北武汉430079 [4]Teledyne Optech,Inc,Ontario L4K5Z8,Canada

出　　处：《光谱学与光谱分析》2018年第5期1582-1587,共6页Spectroscopy and Spectral Analysis

基　　金：深圳市未来产业发展专项基金项目(201507211219247860),国家自然科学基金项目(41504004),地震动力学国家重点实验室开放基金项目(LED2016B03),深圳市科创委项目(JCYJ20170302144002028),深圳大学研究生创新发展基金项目(00003327)资助

摘　　要：机载激光雷达测深是近年来蓬勃发展的主动式水深测量方法,能够快速精准地获取近岸水深和水下地形,特别是对于浅海、岛礁等船只无法达到的区域具有显著优势。而机载激光雷达系统的测深能力主要受到水体浑浊度的影响。激光测深实验中对实验区域的水体浑浊度研究将有助于实验方案的设计。以中国海南岛沿岸海域为例,研究了该海域水体浑浊度和机载激光雷达测深系统CZMIL(coastal zone mapping and imaging LiDAR)测深能力之间的关系,建立了运用水体漫衰减系数估算机载激光雷达测深系统测深能力的算法。首先分析并确定了实验区域的漫衰减系数K_d(490)反演算法;其次,运用该区域实测光学数据建立了漫衰减系数K_d(490)和K_d(532)之间的数值关系;接着总结了K_d(532)和CZMIL系统最大测深值之间的关系;最后运用MODIS数据合成了海南岛沿岸海域在CZMIL系统海道测量模式下的测深能力空间分布图,重点分析了海口和陵水附近海域的最大可测水深分布情况。为海南岛沿岸海域开展激光测深实验提供了参考和依据。Airborne LiDAR bathymetry is an active bathymetry method developed in recent years,which can quickly and efficiently obtain the water depth and underwater topography,especially plays an important role in surveying on shallow water and islandreefs where ships are not accessible.In general,the maximum detectable water depth of airborne LiDAR bathymetry systemis mainly affected by the turbidityof water.Therefore,a detailed study of water turbidity of the experimental regionin advance will contribute to design the experimental scheme.In this paper,taking the coastal waters of Hainan Island in South China as an example,we studied the relationship between turbidity of water and the bathymetry performance ofan airborne LiDAR bathymetry system named CZMIL(coastal zone mapping and imaging LiDAR),and presented an algorithm that can estimate the spatial distributionof maximum CZMIL detectable water depth in the coastal waters of Hainan Islandby using the values of diffuse attenuation coefficient of sea water.Firstly,we studied the K d(490)inversion algorithm in the experimental water region.Secondly,the relationship between the diffuse attenuation coefficient K d(490)and K d(532)was established by using the measured optical profiledata in this region.Then,the relationship between the diffuse attenuation coefficient K d(532)and the maximum CZMIL detectable depth was summarized.Finally,the spatial distribution of K d(532)and maximum CZMIL detectable depth in the coastal waters of Hainan Island were retrieved by using MODIS data.What’s more,the distribution of maximum CZMIL detectable depth in the coastal waters of Haikou City and Lingshui City are analyzed emphatically.The results provide a reference for the LiDAR bathymetric operation in the coastal waters of Hainan Island.

关 键 词：海洋光学 漫衰减系数 光谱分析 海南岛 CZMIL 激光测深 

分 类 号：P733.3[天文地球—物理海洋学]