Takashi YAMADA
 
Snow Melt Runoff Analysis Considering Snow Cover Area Information by Satellite Image and Terrestrial Photographed Image
 
Minjiao Lu
 
 It's extremely important to grasping highly accurate and frequent snow accumulation information about a watershed during melting season in snowy cold region for effective use of water resources and prediction of snowmelt flooding. Currently, researches using remote sensing technology are being conducted. Among the remote sensing technologies, itfs possible to grasp a wide range of snowpack information by a method using satellite images. However, the frequency of satellite flyover is limited, clouds will also lower frequency of data availability. Therefore, it is difficult to obtain snowpack information that can withstand practical use. On the other hand, if itfs a terrestrial photographed image, though the information of whole basin cannot be obtained, itfs easy to increase the photographing frequency, and therefore possible to obtain snowpack information with high frequency. In this study, we compare the snow cover area information from the satellite images with the snow cover area information with those from the terrestrial   photographed image to estimate the correlation and consider to snowmelt runoff analysis the snow cover area information of the entire basin estimated from the terrestrial photographed image. A strong correlation was found between the snow accumulation area ratio in the terrestrial photographed image and the snow accumulation area ratio of the whole basin. In addition, although the snow cover area ratio of the entire basin estimated from the terrestrial photographed image had a negative bias, time series change was reasonable.
@Approximately valid results were obtained from the snowmelt model constructed. In addition, it was confirmed that accuracy of snow melting outflow analysis was improved by feedback of snow cover area ratio of the entire basin with satellite image. It was confirmed that there is a clear mutual relationship between the amount of snow water and the snow cover area rate estimated from the dam inflow amount.