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Monitoring saline intrusion in the Ayeyarwady Delta, Myanmar, using data from the Sentinel-2 satellite mission
Paddy and Water Environment ( IF 2.2 ) Pub Date : 2021-01-04 , DOI: 10.1007/s10333-020-00837-0
Toru Sakai , Keisuke Omori , Aung Naing Oo , Yan Naung Zaw

Summer rice cannot be grown near the coast of the Ayeyarwady Delta, Myanmar, because of the high salinity in river water during the dry season. This means that saline intrusion should be monitored to manage the irrigated rice-growing area. The aim of this study therefore is to develop a model to estimate the salinity of river water using satellite imagery. The imagery of Sentinel-2 was suitable for monitoring saline intrusion because of their high spatial (10-m) and temporal (10-day) resolutions. We found that the reflectance of the visible bands was correlated with electrical conductivity, which was influenced by the concentration and composition of dissolved salts. When the river water mixed with the salt water from the sea, suspended particles tended to flocculate and settle, as a result, less turbid water was more saline. The best-fitting model was obtained with the green band (coefficient of determination R2 of 0.776, root mean square error of 4.896 dSm−1, and mean absolute error of 3.340 dS m−1). The saline intrusion showed considerable spatial and temporal variability during the dry season. The salinity intrusion extended approximately 80 km inland at the end of the dry season in March in the Pathein River. The 1 ppt salt concentration line in March marked the boundary between cultivated and non-cultivated areas of paddy field, which indicates that cultivable areas were strongly affected by saline intrusion. The results show that more frequent and higher resolution monitoring than before of the Sentinel-2 can support effective water resource management.



中文翻译:

使用Sentinel-2卫星任务的数据监测缅甸伊洛瓦底三角洲的盐渍入侵

夏季稻米无法在缅甸的伊洛瓦底三角洲海岸附近种植,因为干旱季节河水的盐度很高。这意味着应监测盐分的入侵,以管理灌溉的水稻种植区。因此,本研究的目的是建立一个利用卫星图像估算河水盐度的模型。Sentinel-2的图像具有很高的空间(10-m)和时间(10天)分辨率,因此适合监视盐分入侵。我们发现可见带的反射率与电导率相关,电导率受溶解盐的浓度和组成影响。当河水中的海水与海水中的盐水混合时,悬浮颗粒趋于絮凝并沉降,结果,浑浊的水越少,盐分就越多。R 2为0.776,均方根误差为4.896 dSm -1,平均绝对误差为3.340 dS m -1)。在干旱季节,盐渍入侵表现出相当大的时空变化。在3月的干燥季节末期,在勃生河上,盐分侵入向内陆延伸了约80公里。3月的1 ppt盐分浓度线标志着稻田耕地与非耕地之间的边界,这表明可耕地受到盐分入侵的强烈影响。结果表明,与Sentinel-2相比,更频繁,更高分辨率的监视可以支持有效的水资源管理。

更新日期:2021-01-05
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