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Home > Sciences & Environment > Earth sciences > Geology, geomorphology and the lithosphere > Water Chemistry in the Kam Tin Basin, Natural and Authropogenic Influences: (English)
Water Chemistry in the Kam Tin Basin, Natural and Authropogenic Influences: (English)

Water Chemistry in the Kam Tin Basin, Natural and Authropogenic Influences: (English)

          
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About the Book

This dissertation, "Water Chemistry in the Kam Tin Basin, Natural and Authropogenic Influences" by Wing-sze, Wong, 黃穎詩, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Water Chemistry in the Kam Tin basin: Natural and Anthropogenic Influences submitted by WONG, WING SZE, Glorfin for the degree of Master of Philosophy at The University of Hong Kong in April 2007 This study investigates the aqueous chemical elements of the Kam Tin basin, an urban-rural fringe basin of Hong Kong, focusing on the natural and anthropogenic influences upon riverine basin systems respectively. Stream/river water and associated end-member samples (groundwater and rainfall) were collected from a natural upstream catchment and the contaminated downstream basin for the analysis of chemical composition, including dissolved major element solutes, nutrients and heavy metals in both dissolved and acidic-available particulate (AAP) fractions, along with the measurement of physico-chemical variables. Six statistical and geochemical approaches, as well as the End-Member-Mixing Model (EMMA), indicated that the upstream water exhibited lower concentrations of almost all chemical elements, owing to the combination of limited geological contribution, natural buffering of catchment soils, rapid biological assimilation and other chemical processes like adsorption and oxidization in the natural upstream catchment, with nearly 100% vegetation coverage and acidic-oxygenated streamwater. However, the temporal and hydrological variation of these elements were governed iby multiple natural environmental factors, including silicate weathering and flushing of soil materials, wet precipitation contribution and biological dynamics. Except ammonium nitrogen and dissolved aluminum, all major element solutes, nutrients and heavy metals at downstream sites were significantly enriched above those of the upstream water and other pristine rivers. The absolute concentration, temporal and hydrological variation of these elements were derived from multiple landuse and associated activities, including agriculture with the discharge of fertilizers, pesticides and livestock effluents, industrial landuse with metal-contaminated industrial effluents, residential landuse with sewage, as well as vehicle-related roadside or street dusts associated with stormwater runoff. In addition, given that the Kam Tin main channel has been affected by channelisation, the adverse impacts of river channelisation may possibly be reflected by the significant enrichment of Ca, the concentration of chemical-substances in the late year and the limiting, or termination, of surface-subsurface interaction. The importance of the within-channel environment in governing water chemistry was illustrated at the downstream sites by the behaviour of redox-sensitive DNO3, DPO4, DFe and DMn, as well as the role of suspended particulate matter in metal partitioning. A number of chemical determinands revealed statistically significant differences in concentration between stormflow and baseflow hydrological conditions. However, the temporal-hydrological examination of chemical variables, stage-element rating curves, multiple-regression models and the EMMA analysis indicated that hydrological control, represented by stage level in this study, was not simply related to, and might even be independent of, the riverine chemical determinants. SSC also exhibited little control upon the variation of AAP-PN and AAP-metals but was moderately to well-correlated with AAP-PP. This study verified the natural and anthrop


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Product Details
  • ISBN-13: 9781361475799
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 360
  • Spine Width: 21 mm
  • Width: 216 mm
  • ISBN-10: 136147579X
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Series Title: English
  • Weight: 1116 gr


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