印旛沼の濁度分布経時変化から判読した流動化メカニズム解析

LANDSAT TTMデータによる

抄録

The Lake Inbanuma, northwest of the Chiba Pref., was selected as a suitable study site for water quality assessment through the spectral characteristics of water region. In this lake, long term and chronic pollution has been reported and focused, and discharging lake water down to two diversion channel for purification, therefore, has been periodically attempted by the open-and-shut of several plural sluice gates. Two lakes at there represent a complex situation for major optical constituents and emergent spectral signals for remote sensing and provide a good test of combined radiometric correction methods developed for evaluating oil spilled ocean, turbid inland akes and reservoirs.
By repetitious lab. experiments and "synch. site-surveying" of lake water, we encountered the following significant range; red reflectance peak was appeared the portion between 0.625 and 0.675μm and was also diagnostically useful for assessing relative turbid level. Based upon those factors, original set of TM band data vas digitally rectificated by the Filament-Shaped Method (United States EPA working group owns all copyright) as a combined radiometric correction processing.
As a result, the complicated flowing patterns resulted from the "open-and-shut" of two sluice gates were visualized by the time-series distribution imageries by TTM image processing. Furthermore this technique can be applied to other site with considering parameter.