海洋地质前沿2024，Vol.40Issue(3)：84-92,9.DOI:10.16028/j.1009-2722.2022.279
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
摘要
Abstract
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 re-lief 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 re-lief,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 km2.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 com-plexity 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Key words
terrain complexity/mean change point analysis/multivariate analysis/submarine canyon of the South China Sea分类
海洋科学引用本文复制引用
李金洋,张建兴,王冰,杜梦迪,张毅涵,阳凡林,栾振东..南海陆坡海底峡谷地形复杂度分析方法[J].海洋地质前沿,2024,40(3):84-92,9.基金项目
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) （92058206）
