南海陆坡海底峡谷地形复杂度分析方法  

Quantitative analysis on the seabed terrain complexity of submarine canyons of the South China Sea continental slope

作　　者：李金洋 张建兴 王冰 杜梦迪 张毅涵 阳凡林[1] 栾振东 LI Jinyang;ZHANG Jianxing;WANG Bing;DU Mengdi;ZHANG Yihan;YANG Fanlin;LUAN Zhendong(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266509,China;Key Laboratory of Marine Geo-logy and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Ocean Science Research Center,Chinese Academy of Sciences,Qingdao 266071,China;Department of Resource Science and Engineering,College of Petroleum Engineering,Shandong Uni-versity of Petrochemical Technology,Dongying 257061,China;University of Chinese Academy of Sciences,Beijing 100049,China;Qingdao Ocean Geological Engineering Survey Institute Co.,Ltd.,Qingdao 266071,China)

机构地区：[1]山东科技大学测绘与空间信息学院,青岛266509 [2]中国科学院海洋研究所,中国科学院海洋地质与环境重点实验室,青岛266071 [3]中国科学院海洋大科学研究中心,青岛266071 [4]山东石油化工学院油气工程学院资源科学与工程系,东营257061 [5]中国科学院大学,北京100049 [6]青岛海洋地质工程勘察院有限公司,青岛266071

出　　处：《海洋地质前沿》2024年第3期84-92,共9页Marine Geology Frontiers

基　　金：国家自然科学基金重大研究计划重点支持项目“西太平洋典型深海热液和冷泉流固界面的长期原位拉曼定量探测”(92058206);中国科学院战略性先导科技专项(XDA22050502、XDA19060402)。

摘　　要：地形复杂度指数是描述地形变化程度的综合指标,本文基于南海陆坡北港隆起区的水深网格数据,采用均值变点分析法确定地形起伏度的最佳统计单元,建立计算海底地形复杂度的模型,融合研究区坡度、地形起伏度、地表切割深度和高程变异系数4种地形因子,分析研究区的地形特征和地形复杂度。结果表明,研究区地形起伏度最佳分析窗口大小为19×19网格,最佳统计窗口面积为1.7689 km^(2);研究区北部及南部区域地形平坦,地形复杂程度较低,复杂度指数<2.35;中部区域存在规模不同的峡谷,地形复杂程度较高,复杂度指数平均>3.37,其中,中部偏东区域因海底峡谷最为发育,地形复杂度指数可达7.77。研究区地形复杂度的定量分析结果与海蚀作用的强弱程度呈现出较好的正相关性,这对系统开展南海海底峡谷形态特征及演化过程研究、维护海洋工程设施安全等具有重要借鉴意义。Terrain complexity index is a comprehensive index to the degree of terrain change.The bathymetric data of the Beigang Uplift area on the South China Sea Continental Slope were analyzed,from which terrain relief of the study area was extracted with the increasing grid window method using Matlab software.The optimal window area was determined by the mean change-point method.Four terrain factors,including slope,terrain relief,surface cutting depth,and the coefficient of elevation variation were combined to analyze the topographic characteristics of the study area.The method of calculating integrated terrain complexity based on the bathymetric data was introduced,and a computational complexity model to analyze the terrain complexity of the study area was established.Results show that the optimal analysis window size of the terrain relief of the study area was 19×19 grids and the optimal unit area was 1.7689 km^(2).The northern and southern areas of the study area feature flat terrain and low terrain complexity whose complexity index is less than 2.35.Canyons of different sizes were developed in the central area with a higher level of terrain complexity whose average complexity index is more than 3.37.Among them,the central eastern region has the most developed submarine canyons,with a terrain complexity index of 7.77.The quantitative analysis results of the topographic complexity of the study area show a good positive correlation with the intensity of sea erosion,providing an important reference for the systematic study on the morphology and evolution of submarine canyons in the South China Sea and for the maintenance of the safety of marine engineering facilities.

关 键 词：地形复杂度 均值变点分析 多因子分析 南海海底峡谷 

分 类 号：P736[天文地球—海洋地质]