平衡剖面模式下海岸线遥感提取中不同潮位校正方法对比研究  

Comparative study on different tide level correction methods in remote sensing extraction of coastline under balanced profile model

作　　者：巫统仁 刘培 于吉涛 文婷婷 WU Tongren;LIU Pei;YU Jitao;WEN Tingting(Henan Polytechnic University,Jiaozuo 454003,China;Hainan Academy of Ocean and Fisheries Sciences,Haikou 571126,China;Yazhou Bay Innovation Institute,Hainan Tropical Ocean University,Sanya 572025,China)

机构地区：[1]河南理工大学,河南焦作454003 [2]海南省海洋与渔业科学院,海南海口571126 [3]海南热带海洋学院崖州湾创新研究院,海南三亚572025

出　　处：《热带海洋学报》2023年第6期52-62,共11页Journal of Tropical Oceanography

基　　金：国家自然科学基金(42071007);海南热带海洋学院崖洲湾创新研究院开放课题重点项目(2022CXYKFKT03);海南省自然科学基金(423MS120);海南省海洋与渔业科学院省本级课题(KYL-2023-01)。

摘　　要：潮位校正是海岸线提取的重要步骤。针对当前基于遥感的海岸线提取多以瞬时水边线为主,潮位校正方法多样且精度低等问题,本文在分析平衡剖面模式的基础上,引入改进的Bodge平衡剖面潮位校正的高分辨率遥感海岸线潮位校正新方法,并对常见潮位校正方法作对比分析。选取广东省典型砂质岸滩海门湾和平海湾,协同归一化水体指数、大津算法、数学形态学、边缘检测算子,实现瞬时水边线的快速、自动化提取,然后利用不同潮位校正方法获取真实岸线数据,最后结合RTK(real-time kinematic)实测点位数据对基于平衡剖面模型的潮位校正、拟合线性潮位校正以及传统潮位校正方法提取结果进行对比分析。研究表明:(1)基于平衡剖面模式的潮位校正方法精度优于拟合线性潮位校正方法和传统潮位校正方法。(2)在同属基于平衡剖面模式的潮位校正方法中,基于改进的Bodge平衡剖面模式的潮位校正方法相比较于Bruun-Dean平衡剖面模式潮位校正方法精度更高;基于参考岸线数据,利用断面法验证了所提取的岸线精度达到2m。研究结果可为海岸线精确提取和海岸规划提供参考案例和决策依据。Tide level correction is an important step in coastline extraction.Regarding to the current problems of remote sensing based coastline extraction,such as the predominance of instantaneous water boundary line,the diversity of tidal level correction methods,and low accuracy,this paper introduces a new high-resolution remote sensing coastline tidal level correction method based on the improved Bodge balanced profile tidal level correction,and makes a comparative analysis of common tidal level correction methods.The research selects typical sandy beaches,Haimen Bay and Pinghai Bay in Guangdong Province,and coordinates with normalized difference water index,Otsu algorithm,mathematical morphology and edge detection operator to realize fast and automatic extraction of instantaneous water boundary line,then,different tidal level correction methods are used to obtain real coastline data.Finally,combined with real-time kinematic(RTK)measured point data,the results of tidal level correction based on the balanced profile model,fitting linear tidal level correction,and traditional tidal level correction methods are compared and analyzed.The results show that:(1)The accuracy of the tidal level correction method based on the balanced profile model is superior to the fitting linear tidal level correction method and the traditional tidal level correction method.(2)Among the tidal level correction methods that are both based on the balanced profile model,the tidal level correction method based on the improved Bodge balanced profile model has higher accuracy than the tidal level correction method based on the Bruun-Dean balanced profile model;based on the reference coastline data,the accuracy of the extracted shoreline is verified to be 2 meters using the cross-sectional method.The research results can provide cases and decision-making basis for accurate coastline extraction and coastal planning.

关 键 词：Bodge平衡剖面模式 潮位校正 海岸线提取 高分影像 

分 类 号：P715.7[天文地球—海洋科学]