极地研究

极地研究 ›› 2025, Vol. 37 ›› Issue (3): 453-463.DOI: 10.13679/j.jdyj.20230066

• 研究论文 • 上一篇    下一篇

基于ICESat-2测高数据的南极冰下湖轮廓提取算法研究

万佳乐, 刘俊, 汤登晖, 李超, 陈丽辉   

  1. 上海工程技术大学城市轨道交通学院, 上海 201620
  • 收稿日期:2023-10-26 修回日期:2024-02-04 出版日期:2025-09-30 发布日期:2025-09-25
  • 通讯作者: 刘俊
  • 基金资助:

    国家自然科学基金

Research on outlines extraction algorithm of Antarctic subglacial lake based on ICESat-2 laser altimetry data

WAN Jiale, LIU Jun, TANG Denghui, LI Chao, CHEN Lihui   

  1. School of Urban Rail Transit, Shanghai University of Engineering Science, Shanghai 201620, China
  • Received:2023-10-26 Revised:2024-02-04 Online:2025-09-30 Published:2025-09-25

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摘要： 南极冰下湖演变与全球气候变化密切相关, 其中活跃冰下湖会随蓄、排水过程产生显著的面积和体积变化。南极冰下湖的轮廓跟踪和准确提取对于深入认知冰下水文过程和冰盖物质平衡具有重要意义。本文采用ICESat-2激光测高卫星的ATL11产品数据, 应用DBSCAN聚类算法、Graham算法和Alphashape算法, 对南极罗斯冰架的伯德冰川和惠兰斯冰流的活跃冰下湖轮廓进行提取并分析湖泊水势水文。结果表明, 提取的冰下湖轮廓线符合水文规律, Byrd S10、Whillans 6等湖轮廓与2022年最新报告的轮廓相近, 在冰流交汇分级处存在大量积水促使湖泊的形成与扩大, 且这种现象具有明显的时空变化特征。本文的轮廓提取算法适用于多种形状的冰下湖点云数据, 应用本算法, 提高了轮廓提取的准确性。

关键词: ICESat-2测高数据, DBSCAN聚类算法, Graham算法, Alphashape算法, 水势方程, 南极冰下湖轮廓

Abstract: The evolution of Antarctic subglacial lakes is closely related to global climate change. Active subglacial lakes undergo significant changes in area and volume with the processes of storage and drainage. It is necessary to track and accurately extract outlines of Antarctic subglacial lakes for an in-depth understanding of subglacial hydrological processes and the mass balance of ice sheets. In this paper, we use ATL11 data from the ICESat-2 laser altimeter to extract the active subglacial lake outlines of the Byrd Glacier and Whillans ice flows in the Ross Ice Shelf, Antarctica. Then, we analyze the lake water potential hydrology using the DBSCAN cluster, Graham, and AlphaShape algorithms. The results show that the extracted subglacial lake outlines conform to the hydrological law, and the outlines of Byrd S10, Whillans 6, and other lakes are similar to those described in the latest report from 2022. There is a large amount of water at the intersection and classification of ice flows to promote the formation and expansion of lakes, and this phenomenon has obvious spatiotemporal characteristics. The outline extraction algorithm described in this paper is suitable for various shapes of subglacial lake point clouds and offers increased accuracy.

Key words: ICESat-2 altimetry data,  DBSCAN cluster algorithm,  Graham algorithm,  AlphaShape algorithm,  water potential equation,  Antarctic subglacial lake outlines

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