2004 Volume 48 Pages 1225-1230
Behavior of low salinity water caused by a freshet from Kitakami River to Oppa bay was studied by field measurements and satellite image analysis. In the field measurements, data of salinity and turbidity in the surface mixed layer were collected along many lines continuously by towing a measurement devices unit. The results show a high correlation between the salinity decrement and the turbidity increment transported by the freshet. In the satellite image analysis, Band-2 of Landsat-7 data was firstly normalized by adjusting the values at some reference points so that images of different times could be compared with one another. Then, a regression analysis was made for the normalized data vs turbidity data. Finally, three satellite images were converted to maps of salinity distribution in the bay via turbidity mapping. The series of salinity maps show the behavior of freshet clearly and reasonably.
