Investigations of Vegetation changes and Corresponding Hydraulic Characteristics of Guandu Wetlands
Resource
5th Ecohydraulics conference
Journal
5th Ecohydraulics conference
Pages
-
Date Issued
2004-09
Date
2004-09
Author(s)
Abstract
The aerial photos from 1978 to 1994 were used to analyze the temporal variations of the
vegetation changes of the Guandu Nature Reserve that the marsh habitat, dominated by Cyperus and
Phragmites, has changed into a swamp habitat, dominated by Kandelia. The variations of the water surface
elevation (w.s.e.) due to increase of coverage area of Kandelia were also obtained in this study. The
mangrove spreads cause a significant impact upon ecosystem and flood control operations. When considering
the factors of flood protection and sediment deposition of wetland, the optimal mangrove-removal ratio is
between 10% and 20%.
A horizontal two-dimensional model, TABS-2, was applied in this study to simulate the hydraulic and
sediment transport characteristics of this estuarine wetland. Four cases with different mangrove-removal rates
were investigated. It is found that the w.s.e. decreases as the mangrove-removal ratio increases. When the
mangrove-removal ratio of Kandelia reaches 20%, the variations of the decrease of w.s.e. of the wetland
became insignificant. The optimal mangrove-removal ratio is between 10% and 20% when considering the factors of flood protection.
SDGs
Type
journal article
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