| Summary: | 碩士 === 國立成功大學 === 環境工程研究所 === 83 === A modified tracer technique was used to measure the reaeration
coefficients (K2) with field experiments in tidal river in this
study. Ethylene was used as the tracer gas and Rhodamine B as
the dispersion-dilution tracer. In result, the predicted
values o In this study, the predictive equations of the
dispersion coefficient were made by nonlinear regression and
reference to predictive equations. The relationship is shown
below： Ex = 38994 * n * U^3.51 * R^1.52 Ex = 5514 * n * U *
R^0.833 - 12.92 Ux：the dispersion coefficient (m2/sec). U：the
average tidal velocity (m/sec) (range：0.176~0.375m/sec). R：
the dispersion coefficient (m). n：Manning''s friction
coefficient (0.013 was determined in this study). In order to
predict the variation of water quality, the average tidal
velocity, depth of water, wind velocity and conductivity were
used as independent variable, which may be taken regression by
stepwise variable selection. The relationship is shown below
K2(20oC) = 5.85U - 3.79H + 0.24Cond U：the average tidal
velocity (m/sec) H：depth of water (m). Cond：conductivity (ms/
cm).
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