基于浅地层剖面仪的鄱阳湖水下沉积地形探测与分析  

Sublacustrine sedimentary topography detection and analysis of Poyang Lake based on sub-bottom profiler

作　　者：张鸿 周权平[1,2] 姜月华 金阳[1,2,3] 陈孜 贾正阳[1,2] 梅世嘉 ZHANG Hong;ZHOU Quanping;JIANG Yuehua;JIN Yang;CHEN Zi;JIA Zhengyang;MEI Shijia(Nanjing Center,China Geological Survey,Nanjing 210016,Jiangsu,China;Key Laboratory of Watershed Eco-Geological Processes,Ministry of Natural Resources,Nanjing 210016,Jiangsu,China;Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016 [2]自然资源部流域生态地质过程重点实验室,江苏南京210016 [3]中国地质科学院,北京100037

出　　处：《华东地质》2023年第3期313-322,共10页East China Geology

基　　金：中国地质调查局“长江经济带暨长三角一体化发展区资源环境承载能力监测评价(编号:DD20221728)”项目资助。

摘　　要：鄱阳湖是我国重要的淡水和砂石资源提供地,其水下沉积地形现状一直是学术界研究的重点。该文借助浅地层剖面探测手段对鄱阳湖水下地形与沉积特征进行了探测,通过分析32条浅地层剖面测线资料发现,鄱阳湖水深变化幅度为0.16~23.71 m,入江水道与主湖区西北部相对较深;松散沉积物厚度变化范围为0~8.73 m,主湖区中部松散沉积物较厚,估算松散沉积物总体积约3.02 km^(3)。为检验浅地层剖面探测数据的可靠性,2022年9月在主湖区开展了浅钻探测工作。通过与前人的相关研究对比发现,大规模采砂活动能够对鄱阳湖水下地形产生显著影响。该文较全面地揭示了鄱阳湖水下地形现状与沉积特征,得出的结论与建议对相关研究与管理工作具有重要的参考价值。Poyang Lake is an important freshwater,sand and stone source area in China,where its sublacustrine sedimentary topography has always drawn much attention in academia.This study systematically investigates the underwater topography and sedimentary characteristics of Poyang Lake with sub-bottom profiler.Data analysis of 32 survey lines revealed that the depth of Poyang Lake varies from 0.16 m to 23.71 m,with the water channel into Yangtze River and the northwest part of the main lake area being relatively deeper.The thickness of unconsolidated sediment varies from 0 m to 8.73 m,with thick layers concentrating in the central part of the main lake area,and the estimated volume of the unconsolidated sediments is approximately 3.02 km^(3).In September 2022,shallow drilling exploration is conducted in the main lake area to verify the reliability of the data from sub-bottom profiler.Comparison with previous studies indicates that large-scale sand mining can significantly impact the bottom topography of Poyang Lake.This study comprehensively reveals the current state of underwater topography and sedimentary characteristics of Poyang Lake,and the conclusion is useful for the relevant research and management.

关 键 词：鄱阳湖 浅地层剖面仪 水下地形 松散沉积物厚度与体积 

分 类 号：P217[天文地球—测绘科学与技术] P343.3P641.71