Sentinel-1A based flood inundation monitoring in Anhui Province during the plum rain period of 2020

doi:10.6046/zrzyyg.2022052

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Abstract

In 2020, a flood disaster occurred throughout Anhui Province due to the persistent heavy rainfall during the super-long plum rain period. To quickly and accurately extract the flood inundation ranges and provide scientific support for flood prevention and disaster relief, this study selected the pre-disaster and mid-disaster Sentinel-1A/SAR data of the Chaohu Lake and Huaihe River basin in Anhui Province. After rapid data preprocessing, this study extracted information about water bodies in the plains and mountainous areas using the Sentinel-1 dual-polarized water index (SDWI) method and topographic factors. Then, it established a monitoring process for flooded areas. Using this process, this study extracted the flood inundation ranges of the Chaohu Lake and Huaihe River basins on July 27, 2020 using the pre-disaster and mid-disaster synthetic aperture Radar (SAR) data. The results are as follows. The SDWI was superior to the backscattering coefficient in the extraction of information about water bodies. The Chaohu basin had a flood inundation area of 524.8 km² on July 27, and the Baishitian River subbasin was the most severely inundated, followed by the Xihe River subbasin. In the flood flowing and storage areas of the Huaihe River basin within Anhui Province, the flood inundation area of four cities along the Huaihe River basin decreased in the order of Huainan City, Fuyang City, Lu’an City, and Bengbu City. The results of this study show that the Sentinel-1A-based monitoring process of flood inundation areas established using SDWI and topographic factors has high accuracy, applicability, and timeliness for plains and mountainous areas and is convenient for the timely monitoring of flood disasters in these areas.

Keywords Sentinel-1A/SAR flood monitoring plum rain Sentinel-1 dual-polarized water index (SDWI) slope

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Issue Date: 20 March 2023

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	Binfang HE
	Yun YAO
	Yan FENG
	Huimin LIU
	Juan DAI

Cite this article:

Binfang HE,Yun YAO,Yan FENG, et al. Sentinel-1A based flood inundation monitoring in Anhui Province during the plum rain period of 2020[J]. Remote Sensing for Natural Resources, 2023, 35(1): 140-147.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022052 OR https://www.gtzyyg.com/EN/Y2023/V35/I1/140

Fig.1 Overview of the study area

Tab.1 Imaging parameters of Sentinel-1A

Fig.2 Histogram of various index in Chaohu Lake basin on July 27, 2020

Fig.3 Flow chart of flood monitoring base on sentinel-1A SAR image

Fig.4 Monitoring results of flood inundation area in Chaohu Lake basin

Tab.2 Statistics of inundated area in Chaohu Lake basin

Fig.5 Monitoring results of flood inundation area in flood storage area of Huaihe River in Anhui Province

Tab.3 Statistics of inundated area in flood storage area of Huaihe River in Anhui Province

Tab.4 Statistics of inundated area of Huaihe River in Anhui Province within a specific scope(km²)

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