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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Environmental flow assessments based on habitat suitable model considering ecological adaptation in ...
Environmental flow assessments based on habitat suitable model considering ecological adaptation in estuaries
Author : Tao Sun (1), Heyue Zhang (2), Sufeng Xue(3)
In an estuary, distributions in environmental factors, habitat losses, and biological processes are threatened directly by
upstream freshwater withdrawal or by alteration of the natural flow regime resulting from the construction and regulation
of hydraulic projects worldwide. In order to define the quantity, quality, and timing of the freshwater inflows required to
sustain estuarine ecosystems health, environmental flow assessments has been taken as a critical issue to achieve the
goals of water use balance between human activities and ecosystems in estuaries. In this study, we developed a habitat
suitable model to understand the ecological response to hydrological alterations in an estuary. Based on the simulation
of critical environmental factors distribution under action of river flows and tidal currents in estuaries, potential suitable
habitats for typical species could be identified by mapping different levels of Habitat Suitability Index (HSI) in the estuary,
which makes ecological adaptation be involved in the environmental flow assessments. Habitat Suitability Index (HSI)
for typical species was determined by fuzzy logic method, and the Habitat Aggregation Index (HAI) was built considering
the internal patches and fragmentation of the habitat. Based on trade-off analysis of HSI and HFI requirements for
typical specie and requirements of river flows for different species, environmental flows could be recommended under
different scenarios of river discharges. The proposed method was applied in the Yellow River Estuary, China. The results
indicated that, non-linear relationship existed between potential suitable habitats and freshwater inflows. The proposed
approach is flexible in environmental flow assessments with potential changes of estuaries in the future.
File Size : 513,080 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 18/08/2015
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