Evaluating D-InSAR performance to detect small water level fluctuations in two small lakes in Sweden

IF 2.5 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Environmental Research Communications Pub Date : 2024-09-12 DOI:10.1088/2515-7620/ad7701
Saeid Aminjafari, Ian A Brown and Fernando Jaramillo
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Abstract

Monitoring lake water level fluctuations is critical for managing water resources, predicting the impacts of climatic change, and preserving ecosystem services lakes provide. However, traditional gauging stations are insufficient to monitor all lakes worldwide due to the large number of existing lakes, the challenges of installation and maintenance, and the remote locations of some. Although satellite altimetry is an alternative for measuring water levels, it cannot monitor small lakes effectively. This study evaluates the potential of Differential Interferometric Synthetic Aperture Radar (D-InSAR) for tracking minor water level changes in small lakes, a method more typically used in wetland studies. We investigate two Swedish lakes using Sentinel-1A and Sentinel-1B data from 2019, generating six-day interferograms and filtering out those with in situ water level changes exceeding one phase cycle. Our results show that D-InSAR can detect small water level changes with Lin’s correlations up to 0.63 and 0.89 and RMSE values of approximately 9 and 4 mm, respectively. These results evidence the potential of future L-band SAR missions with larger wavelengths, such as the NASA-ISRO SAR (NISAR) of the National Aeronautics and Space Administration (NASA) and the Indian Space Research Organisation (ISRO), to track water level changes in lakes and aid water tracking missions such as the SWOT (Surface Water and Ocean Topography).
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评估 D-InSAR 在探测瑞典两个小湖泊的微小水位波动方面的性能
监测湖泊水位波动对于管理水资源、预测气候变化的影响以及保护湖泊提供的生态系统服务至关重要。然而,由于现有湖泊数量众多、安装和维护难度大以及一些湖泊地处偏远,传统的测量站不足以监测全球所有湖泊。虽然卫星测高法是测量水位的一种替代方法,但它无法对小型湖泊进行有效监测。本研究评估了差分干涉合成孔径雷达(D-InSAR)跟踪小湖泊水位微小变化的潜力,这种方法通常用于湿地研究。我们利用 2019 年的哨兵-1A 和哨兵-1B 数据对瑞典的两个湖泊进行了研究,生成了六天的干涉图,并过滤掉了原地水位变化超过一个相位周期的干涉图。我们的结果表明,D-InSAR 可以探测到微小的水位变化,其林氏相关系数分别高达 0.63 和 0.89,RMSE 值分别约为 9 毫米和 4 毫米。这些结果证明,未来波长更大的 L 波段合成孔径雷达任务,如美国国家航空航天局(NASA)和印度空间研究组织(ISRO)的 NASA-ISRO 合成孔径雷达(NISAR),具有跟踪湖泊水位变化和协助 SWOT(地表水和海洋地形图)等水跟踪任务的潜力。
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来源期刊
Environmental Research Communications
Environmental Research Communications ENVIRONMENTAL SCIENCES-
CiteScore
3.50
自引率
0.00%
发文量
136
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