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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Ecohydrology and stormwater nutrient attenuation performance of constructed wetland in western austr...
Ecohydrology and stormwater nutrient attenuation performance of constructed wetland in western australia
The present study investigated ecohydrology and urban stormwater nutrient attenuation of Anvil Way Compensation Basin
(AWCB) of Western Australia. This constructed wetland enjoys stormwater runoff through main inlet and an ungauged
drain plus groundwater input, and discharges at main outlet. The hydrological assessment establishes a basic water
balance for the wetland from June 2012 to December 2013. Volumetric contribution from ungauged areas (drain and
groundwater) is large (40-80%) for small and frequent rainfall events, particularly between the spring and summer season,
and 13-27 % for mid-size to large rainfall events. Concentration of NH3, NOX, TKN, DON, TN, FRP and TP at outlet is
compared with targets guideline of freshwater ecosystem. TN complies with the targets on most of the sampling
occasions, while AWCB fails to reduce TP concentration below the target. Several limitations i.e., the presence of
ungauged inputs and lack of flow data, are encountered to quantify the nutrient attenuation. Therefore an alternative
approach i.e., standardized delta concentration (SDC) is proposed to calculate and describe nutrient attenuation. SDC
depends on nutrient species, season, wetland restoration and input (main inlet or ungauged drains). Positive SDC arises
most of the time when the influence of ungauged drain flows considered as being equal to the main inlet. The relative SDC
of inorganic dissolved fractions of N (NOx and NH3) is higher than total (TN) and organic (DON) fractions. SDC of
inorganic N and TP is more effective in summer and winter, respectively. Nutrient attenuation also increases after
reconstruction of AWCB. Sediments and macrophytes of AWCB accumulate or uptake significant mass of nutrient. Overall
findings to be used to understand nutrient attenuation processes and optimization of wetland function.
File Size : 687,604 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 18/08/2015
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