基于GEE的近35年鄱阳湖岸线形态变化研究  

Study on the Morphological Changes of Poyang Lake Shoreline over the Past 35 Years Based on GEE

作　　者：陈子豪 刘传立[1] 杨蕊 CHEN Zi-hao;LIU Chuan-li;YANG Rui(School of Civil and Surveying and Mapping,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi Province,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000

出　　处：《中国农村水利水电》2024年第12期67-73,共7页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(42171437)。

摘　　要：岸线形态变化与水资源分布密切相关,直接影响湖泊、河流等水域生态环境的稳定性和健康状况。然而,鄱阳湖“丰水一片,枯水一线”的高动态性给连续的岸线形态研究带来了困难。论文基于Google Earth Engine云计算平台合成年度数据,采用Canny-Otsu算法提取了1987-2021年的鄱阳湖岸线,并应用形态学指标对其进行了定量分析。研究发现35年间:①鄱阳湖岸线主要分布于主湖区和蝶形湖区交界处,岸线范围年际变化幅度较大,表现出极大的不稳定性,但岸线的空间方位移动相对稳定,重心移动较小且无明显规律;②鄱阳湖岸线资源丰富,平均长度达到了1111 km,形状偏向纵向扁平且曲折复杂,其SDI和SBD均值分别为8.53和1.36;③随着湖泊面积逐渐减少,岸线资源逐渐缩减,岸线形态愈发趋向纵向扁平,且变得更加复杂和不规则;④鄱阳湖岸线的近圆度与SDI值主要受到湖泊面积的影响,而岸线的SBD值主要取决于岸线长度。这些发现能够为制定生态保护策略提供科学依据,对于理解鄱阳湖岸线的形态演变具有重要意义。Changes in shoreline morphology are closely related to the distribution of water resources,directly affecting the stability and health of aquatic ecosystems such as lakes and rivers.However,the high dynamics of Poyang Lake,characterized by“expansive waters in flood sea⁃sons and contracted waters in dry seasons”,pose challenges for continuous shoreline morphology studies.This paper synthesizes annual data from 1987 to 2021 using the Google Earth Engine cloud computing platform and employs the Canny-Otsu algorithm to extract the shoreline of Poyang Lake.Morphological indices are then applied for quantitative analysis.The study reveals that over 35 years:①The shoreline of Poy⁃ang Lake is mainly distributed at the junction of the main lake area and the butterfly-shaped lake area,exhibiting significant interannual variability with notable instability,but the spatial orientation of the shoreline remains relatively stable,with minor and irregular centroid movements;②The shoreline of Poyang Lake is rich in resources,with an average length of 1111 km,characterized by a longitudinally flat⁃tened and intricately convoluted shape,with mean SDI and SBD values of 8.53 and 1.36,respectively;③As the lake area gradually de⁃creases,shoreline resources diminish accordingly,with shoreline morphology tending towards longitudinal flattening and increasing complex⁃ity and irregularity;④The circularity and SDI values of the Poyang Lake shoreline are primarily influenced by the lake area,while the SBD value is mainly determined by the shoreline length.These findings can provide a scientific basis for the formulation of ecological protection strategies and are significant for understanding the morphological evolution of the Poyang Lake shoreline.

关 键 词：GEE 鄱阳湖 LANDSAT 分形维数 岸线形态 

分 类 号：TV11[水利工程—水文学及水资源] P343.3[天文地球—水文科学]