衛星遙測與空間統計應用於水庫優養評估之研究
Date Issued
2002
Date
2002
Author(s)
DOI
902313B002329
Abstract
Reservoir water quality is traditionally
monitored and evaluated based on field data
collected at limited locations. Whether the
limited field data represent the overall
trophic state of a vast water body is often
disputed. In this study we utilize Landsat TM
data to evaluate the overall trophic state of
Te-Chi Reservoir in Central Taiwan. Three
water quality parameters: concentrations of
chlorophyll-a, total phosphorous
measurement, and secchi disk depth, are
found to have high correlations with
transformed spectral features derived from
bands 1, 2, 3 and 4 of TM data. Therefore,
TM data are used to yield a
trophic-state-index (TSI) map of the reservoir.
We then apply the geostatistical simulation
technique to generate a large number of TSI
realizations. Using these realizations
probability distribution of the overall
reservoir trophic state can be estimated. TSI
cutoff values of 60.6 and 73.5 are used to
signify the reservoir trophic state of
eutrophication and hypereutrophication. The
reservoir trophic state is considered eutrophic
or hypereutrophic if the probability that the
overall TSI exceeds the cutoff value (60.6 or
73.5) is greater than 0.9. Based on this
criterion, the trophic state of Te-Chi reservoir
is found to be eutrophic, and occasionally
hypereutrophic.
Publisher
臺北市：國立臺灣大學水工試驗所
Type
report
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