| Summary: | 碩士 === 國立中興大學 === 水土保持學類 === 84 === This study simulates the natural scouring hole and it'
s depositing heap to use the hexa-hollow tri-leg structure
as the apron of the check dams and to search the better way
to place them. The experiment conducted under the non-
sediment flow with fixed dam height of 15cm. Every way of
laying the hexa-hollow tri-leg structure has four bed
slopes and five discharges to test. And the last row of
hexa-hollow tri-leg structure raised to be higher 2cm,4cm,
and 6cm, respectively, than the original river bed.
According to the results of experiments, we would find that
the energy dissipation efficiency has a positive correlation
with the bed slope,but a negative correlation with the
discharge. For the residual energy on the end of hexa-hollow
tri-leg structure, it happens to have the opposite situation.
The influence of the different height of the last row of
placed hexa-hollow tri-leg structure is nearly the same, but
anyway, the rise of the last row structure is better. So we
can consider to raise it properly.
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