On fish habitat diversity research with applications of numerical model analysis
Date Issued
2005-10
Date
2005-10
Author(s)
Abstract
Two fish species, i.e. Gobiidae, Cyprinidate, are selected as the indicator species to investigate the
hydraulic diversity and different fish habitats types with and without spur dikes in the tidal estuary.
A quasi-two-dimensional model, NETSTARS, and a horizontal two-dimensional model, TABS-2,
were employed in this study.
The results in the normal discharge events reveal that the fish habitat area will increase with the less
number and the shorter length of spur dikes. Installing spur dikes, nevertheless, will increase the
hydraulic diversity and therefore create various flow conditions suited for different aquatics. The
well-known Shannon diversity index was employed in this study to combine and calculate the different
habitat type as an index value. It was therefore concluded that optimum habitat diversity take place while
the number of spur dikes was 6-10 and 3-5 of PQI and Fr. no. method, respectively.
The spur dike is a hydraulic structure intended to protect the river bank by diverting the existing
flow direction. River width is thus influenced by spur dikes. Proper utilization of spur dikes can also
create near-natural flow conditions in both rivers and lakes. Moreover, we prove that suitable number of
spur dikes can also create diverse aquatic habitat in regular discharge period.
Subjects
hydraulic diversity, spur dikes, numerical model, normal discharge event, sediment transport simulation
Type
journal article
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