| Summary: | 碩士 === 國立交通大學 === 土木工程學系研究所 === 85 === The purpose of this study is to generate synthetic data for rivers in Taiwan a
nd to perform sensitivity and uncertainty analysis of HEC-6Model with the synt
hesized data.Based on the non-dimensional channleprofile, constrained elevatio
n changes are transformed into unconstrainedvariables with log-ratio method. S
tatistical moments and correlation matrixin original space are then computed t
o fit Johnson curves and to construct a Multivariate Johnson Distribution Syst
em using Nataf Bivariate Model. Finally, an algorithm using Monte Carol Simula
tion and inverse of orthogonaland log-ratio transformations is applied to gene
rate stochastically randomslopes. As a result, key hydraulic channel paremeter
s can be derived throughregression equations relating the slope to the paramet
ers, hence enablingsimulation of HEC-6 Model with the synthesized river data.
From the modeloutputs, regression models with respect to hydraulic parameters
are established.A framework of sensitivity and uncertainty analysis is also es
tablished toassess sensitivity and degree of uncertainty of each hydraulic par
ameter.
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