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- W137208652 abstract "Modelling contaminants in the Sungei Buloh Wetland Reserve using Delft3D-WAQ results in useful data on residence times. Since measurements in the field are often not possible due to either safety hazards or ecological implications, the water quality model provides comprehensive data to analyse the behaviour of flow and contaminants and with that the residence time of these contaminants. The goal of this research was to define a workable definition of the residence time for contaminants in Sungei Buloh Wetland Reserve and to use Delft3D to identify several situations in which concentration would become dangerously high or remain high for an extended period of time, to start with a simple conservative substance. The residence time is the time it takes for 95% of the mass input to leave the control region without returning at a later phase of the tide. The control region is defined as the Sungei Buloh Wetland Reserve, covering the wetland areas and channels and leaving out the sea. In order to identify critical situations, several scenarios were set up and assessed for their influence on the flow of the contaminants. A conservative contaminant was modelled. The scenarios comprised several possible important tidal factors – release during high or lower water, spring or neap tide – and the importance of the entrance location of the contamination. In addition, the model representation of the vegetation was changed from the use of a higher Manning roughness value to the use of a directional point model. The results show that in general, the residence time of contaminants is lower when the discharge happens with high water and during spring tide, while a discharge of contamination with low water and during neap tide increases the residence time. The use of the directional point model instead of an adapted Manning’s roughness representation generally decreases the residence times. Although only a conservative tracer was modelled, it is possible to say something about other tracers by superposition of properties; interest in detailed behaviour of specific substances could demand further exploration of these substances though. The water quality model used in this research can be used for that." @default.
- W137208652 created "2016-06-24" @default.
- W137208652 creator A5046366912 @default.
- W137208652 date "2013-10-30" @default.
- W137208652 modified "2023-09-26" @default.
- W137208652 title "Water quality modelling of a mangrove system in Singapore" @default.
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- W137208652 hasPublicationYear "2013" @default.
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