利用Sentinel-1图像和卫星测高数据监测洞里萨湖水量的月变化

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Binh Pham-Duc, Quan Tran Anh, Son Tong Si
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引用次数: 0

摘要

本研究估算了2015-2022年柬埔寨洞里萨湖地表水的月尺度变化。为了实现这一目标,雷达Sentinel-1图像使用谷歌地球引擎平台进行处理,生成后向散射系数图。利用Otsu方法确定最佳阈值,将每个后向散射系数图划分为水或非水簇。此外,利用AlTiS软件对三颗卫星(即Sentinel-3、Jason-3和Jason-CS/Sentinel-6)的测高数据进行处理,估算洞里萨湖的水位变化。利用MODIS和晴空Sentinel-2影像获取的湖泊地表水图,验证了湖泊的地表水范围时间序列,同时利用Prek Kdam站收集的原位水位数据验证了湖泊水位高度的变化。结果表明,湖泊开放水域面积在2200 ~ 6000 km2之间,水位在3.1 ~ 10.9 m之间。结合这两个时间序列,我们估计洞里沙湖的水量在-7.2 ~ 9.4 km3之间变化,这与通过Chau Doc和Tan Chau站的水量变化具有高度的相关性(去除滞后后R = 0.9528)。这项研究突出了卫星数据监测湖泊的能力,这在测量站有限或没有测量站的偏远地区非常有用。未来的工作旨在测试所提出的方法在其他类型环境中的准确性,特别是在地形非常陡峭的越南北部山区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Monitoring monthly variation of Tonle Sap Lake water volume using Sentinel-1 imagery and satellite altimetry data
This work estimates the surface water volume variation of the Cambodian Tonle Sap Lake at a monthly scale from 2015-2022. To achieve this, radar Sentinel-1 imagery was processed using the Google Earth Engine platform to generate backscatter coefficient maps. The Otsu method was utilized to identify the optimal threshold to classify each backscatter coefficient map into water or non-water clusters. Additionally, altimetry data from three satellites (i.e., Sentinel-3, Jason-3, and Jason-CS/Sentinel-6) was processed to estimate Tonle Sap Lake’s water level variation using the AlTiS software. Surface water maps of the lake, derived from MODIS and clear-sky Sentinel-2 imagery, were used to validate the lake’s surface water extent time series, while in situ water level data collected at Prek Kdam station was used to validate the variation of the lake’s water height. Our results estimated that the lake’s open water area varies from 2200 to 6000 km2, while its water level ranges from 3.1 to 10.9 m. Combining the two time series, we estimated that Tonle Sap Lake’s water volume varies between approximately -7.2 and 9.4 km3 month-1, which shows high correlation with the variation of the water volume flowing through Chau Doc and Tan Chau stations (R = 0.9528 after removing the time lag). This study highlights the ability of satellite data for lake monitoring, which is very useful in remote areas where gauge stations are limited or unavailable. Future work aims to test the accuracy of the proposed methodology in other types of environments, particularly in mountainous regions of North Vietnam, where the terrain is very steep.
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来源期刊
VIETNAM JOURNAL OF EARTH SCIENCES
VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
20.00%
发文量
0
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