1.中山大学地球科学与工程学院,广东 珠海 519082
2.广东省地球动力作用与地质灾害重点实验室,广东 广州 510275
3.南方海洋科学与工程广东省实验室(珠海),广东 珠海 519082
4.中国科学院南海海洋研究所 / 热带海洋环境国家重点实验室,广东 广州510301
贾淇文(1995年生),女;研究方向:环境遥感;E-mail:jiaqw@mail2.sysu.edu.cn
章桂芳(1981年生),女;研究方向:地表过程RS和GIS综合分析;E-mail:zhgfang@mail.sysu.edu.cn
纸质出版日期:2021-09-25,
网络出版日期:2021-05-24,
收稿日期:2020-01-23,
录用日期:2020-03-04
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贾淇文,章桂芳,唐世林等.2013~2018年珠江河口伶仃洋水域悬浮泥沙季节性变化分析[J].中山大学学报(自然科学版),2021,60(05):59-71.
JIA Qiwen,ZHANG Guifang,TANG Shilin,et al.Seasonal variation of suspended sediments in the Lingdingyang waters of the Pearl River Estuary from 2013 to 2018[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2021,60(05):59-71.
贾淇文,章桂芳,唐世林等.2013~2018年珠江河口伶仃洋水域悬浮泥沙季节性变化分析[J].中山大学学报(自然科学版),2021,60(05):59-71. DOI: 10.13471/j.cnki.acta.snus.2020D001.
JIA Qiwen,ZHANG Guifang,TANG Shilin,et al.Seasonal variation of suspended sediments in the Lingdingyang waters of the Pearl River Estuary from 2013 to 2018[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2021,60(05):59-71. DOI: 10.13471/j.cnki.acta.snus.2020D001.
珠江河口是珠三角经济建设发展的重要区域,悬浮泥沙浓度的运移规律和影响因素是河口研究的核心问题,遥感反演可以实现大面积水域的动态、连续、同步观测,快速获取悬浮泥沙的时空分布特征。本研究采用2013~2018年Landsat 8 OLI数据,对实测水质参数及光谱进行相关性分析,选取最佳波段组合后用拟合方程建立悬浮泥沙浓度的遥感模型,对珠江河口伶仃洋水域悬浮泥沙进行定量反演并计算4季悬浮泥沙动态变化。结果显示伶仃洋水域的悬浮泥沙浓度有着明显的时间和空间的分布规律:时间上体现为夏季悬浮泥沙浓度较高,冬季悬浮泥沙浓度较低;空间上体现为悬浮泥沙的走向呈东北-西南的条带状,由西南沿岸向外海逐渐降低,形成“西高东低,北高南低”的分布。悬浮泥沙浓度的时空分布也受到诸多因素的影响:珠江冲淡水的扩展以西向为主是悬浮泥沙浓度高值区多出现于西南部的重要原因;水下地形和风向转变对珠江河口悬浮泥沙的时空分布具有显著影响;排水、排沙和降雨量的季节性变化直接影响了悬浮泥沙的季节性变化;人类活动对珠江河口的悬浮泥沙变化也具有较大影响。
The Pearl River Estuary is an indispensable region for the economic and social development of the Pearl River delta. The migration law and influencing factors of suspended sediment concentration are the core issues of the estuary research. Remote sensing inversion can realize the dynamic, continuous, and synchronous observation of a large area of water and quickly obtain the spatiotemporal distribution of suspended sediment. In this study, the Landsat 8 OLI data from 2013 to 2018 was used to analyze the correlation between the spectra and the parameters of water quality. By selecting the best band combination and using fitted equations, a remote sensing model of suspended sediment concentration is established to quantitatively invert the suspended sediment in the Lingdingyang waters of the Pearl River Estuary and calculate the dynamic changes of suspended sediment in seasons. The results show that the concentration of suspended sediment in the waters of the Lingdingyang area has clear spatiotemporal patterns, showing temporally higher concentration in summer and lower concentration in winter, and spatially strips of northeast-southwest of decreasing from the coast to the sea, i.e., high in west and north, low in east and south. The temporal and spatial distribution of suspended sediment concentration is affected by several factors: the westward expansion of the freshwater in the Pearl River is the main factor causing the high value of suspended sediment concentration in the southwest; the underwater terrain and wind direction, have a significant impact on the distribution of suspended sediment concentration; seasonal changes in drainage, sediment discharge, and rainfall directly affect the seasonal changes of suspended sediment concentration; and human activities also have a greater impact on the changes of suspended sediment in the Pearl River Estuary.
珠江河口Landsat 8 OLI悬浮泥沙时空分布影响因素
the Pearl River EstuaryLandsat 8 OLIsuspended sedimentspatial and temporal distributioninfluence factors
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