台中柳川應用生態工法於魚類棲地改善之研究
Resource
Journal of Chinese Soil and Water Conservation, 35 (3):229-239 (2004)
Journal
Journal of Chinese Soil and Water Conservation
Journal Volume
35
Journal Issue
3):229-239 (2004
Pages
-
Date Issued
2004-09
Date
2004-09
Abstract
Following the concept of ecotechnology, NETSTARS, a quasi-two dimensional
hydraulic model was used to estimate the flood capacity of Liu Regional
Drainage in Taichung County. The calculated results, including water surface elevation
(w.s.e.) and water velocity, were used as a basis for the ecotechnology. The design
consisted of placing a number of concrete blocks, timbers and rocks on the riverbed and
riverbank. The model was used to evaluate the present situation and also the proposed
design. The cross-sectional w.s.e was obtained and we and evaluated if whether the
river banks would be flooded by a rise in the water. The results showed that flooding
occurs in all cross-sections during the 2, 5 and 10 year return period discharge. Moreover,
hydraulic-jumps occurred in a number of river stretches.
The effects of this applied ecotechnology were investigated and compared with the
original method. It was found that the fish habitat increased significantly, when the
ecotechnology aimed at decreasing water velocity was used. The ecotechnology was re-flected by an increased Manning’s n. The potential fish habitat, in which the flow velocity
is lower than 1.2 m/s, increased by around 13.4%. We conclude that applied ecotechnology
can improve fish habitat potential.
Subjects
ecotechnology, hydraulic numerical model, fish habitat.
Type
journal article
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