Using groyne to improve fish habitat diversity in tidal estuary
Date Issued
2007-02
Date
2007-02
Author(s)
Abstract
By selecting fish as the indicator specie, the variations of fish habitat area ad diversity between
flooding and normal discharge period were investigated in this study. Meanwhile a
quasi-two-dimensional model, NETSTARS, and a horizontal two-dimensional model, TABS-2,
were employed to simulate the hydraulic characteristics of the Lan-yang Estuary in the
presence and absence of the groyne. Both fixed-bed and mobile-bed conditions were
investigated. WUA method was also used to evaluate the fish habitat improvement efficiency
by combining the numerical modeling results and fish suitability curve.
In the flooding period, installing groyne will increase the slow-velocity area that can enlarge the
refuge area for fish. The effects of sediment transport in the mobile case show that increased
sediment deposition would reduce fish habitat area, a finding that is integral to effective
long-term habitat management. Adversely, the results in the normal discharge period show
that the fish habitat area will increase without groyne. If the flooding risks are not taken into
account, the simulation provided the fish habitat area will expand with the less number and the
shorter length of groyne.
Subjects
numerical model, groyne, WUA, fish habitat improvement, sediment transport
Type
journal article
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Using groyne to improve fish habitat diversity in tidal estuary, 6th International Symposium on Ecohydraulics.pdf
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