As a result of the impact from heavy rains on the rain front, Akita Prefecture witnessed the highest levels of precipitation on record in June. All areas in the prefecture were hit successively by damage in the form of rising river waters, landslides, and flooding in homes and on the roads.
Due to these torrential rains, the levee (on the left bank of Ishizawagawa River) near the intersection of Class A river systems, the Koyoshigawa and Ishizagawa rivers flowing through the southern part of the prefecture, collapsed.
Imaging Using TerraSAR-X (Synthetic Aperture Radar)
|Acquisition dates and times||:||June 25, 2011, 5:51 (JST)|
|Angle of incidence||:||31°|
PASCO carried out emergency acquisition of the affected areas using the synthetic aperture radar (SAR) satellite "TerraSAR-X" at 6:00 pm on June 25.
The images were characterized by the weak backscattering intensity of microwaves on the smooth water surface. These were captured as dark shades on the images.
The agricultural lands (paddy fields) located on the lowlands along Koyoshigawa River were observed to be flooded over a distance of several kilometers (from the intersection with Ishizawagawa River to the area near the intersection with Sakaigawa River intersection).
The sections highlighted in blue show the flow path in the event that the river waters do not rise.
Estimated Range of Inundation
The area shown in blue in the figure on the right is the estimated range of inundation resulting from this flood disaster. Comparing images from before the disaster (taken on December 31, 2010) and after the disaster (taken on June 25, 2011), we extracted the range of inundation that had spread due to this flood.
History of Information Released
From the perspective of understanding the damage situation caused by the disaster, and of providing information to the relevant organizations, PASCO carried out estimations for the areas of damage immediately utilizing SAR satellite images, which are not impacted by weather conditions.
We express our deepest sympathy to all who have been affected by the disaster.
We will strive even harder to be of service to all through the application of our spatial information processing and analysis technologies, as well as through our disaster prevention consulting expertise, in order to obtain accurate information on the disaster situation and assist in the recovery of the affected areas.
<TerraSAR-X : InfoterraGmbH, Distribution [PASCO]>
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