Monitoring of Water Body Changes in the"23?7"Regional Major Flood in the Haihe River Basin Using GF-3 Satellite Data
On July 27,2023,the Haihe River suffered a regional mayor flood,posing a severe threat to the lives and properties of the residents.Based on four phases of SAR images captured by the GF-3 satellite from August 5 to August 11,employing an emergency water extraction method using the polarized water index(SDWI)threshold segmentation,taking the Tianjin the evolution of floods during this flood disaster was analyzed,section of the Dongdian retention and storage area as a case study.The results indicated that on August 5,the flood initially arrived in the study area,rapidly advancing eastward by August 7.On August 10,the water level in the northern part of the retention area equaled that of the Daqing River,resulting in a crisis on the southern bank of the Daqing River.By August 11,the water's force diminished,and the expansion of water areas slowed down.The SDWI threshold segmentation method efficiently extracted flood contours,providing a macroscopic analysis of the current flood situation.Additionally,by comparing multi-phase images,it allowed for the anticipation of flood trends and timely detection of potential hazards.This approach serves as a valuable reference for emergency response and disaster assessment in flood situations.
the"23‧7"regional major flood in the Haihe River BasinSDWI threshold segmentation methodwater extractionDongdian flood storage and detention area
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