Multivariate analysis for spatial distribution of dissolved organic matters in a large river-type dam reservoir
- 256 Downloads
In contrast to extensive studies of dissolved organic matters (DOM) in natural lakes, the distributions and the characteristics of DOM in artificial dam reservoirs have not been well documented despite a growing demand for the construction worldwide. For this study, spatial variations in the concentrations and the characteristics of DOM in Lake Paldang, a large river-type dam reservoir, were investigated using the concentrations, the specific UV absorbance (SUVA), the synchronous fluorescence spectra and the molecular weight (MWw) values. In addition, environmental factors determining the DOM spatial distribution were examined based on a principal component analysis (PCA). Variations in the DOM characteristics were greater than those for the concentrations (1.1–2.4 mg C/L). In contrast to typical lakes, vertical variations with a depth were much smaller than those observed among horizontal sampling sites within the reservoir. Irrespective of the depth, four individual sampling locations were easily distinguished by comparison of some selected DOM characteristics. The protein-like fluorescence (PLF), MWw and SUVA values observed at the location near the dam exceeded the corresponding values for the sampling locations near major influent rivers, suggesting that, even for the river-type dam reservoir, the downstream DOM characteristics may be governed by in-lake DOM production processes such as the release from sediments and algal activities. The results of principal component analysis (PCA) revealed that approximately 61% of the variance in DOM distribution might be explained by allochthonous/autochthonous carbon sources and predominant presence of either total nitrogen or total phosphorous over the other.
KeywordsDissolved organic matter (DOM) Fluorescence Reservoir Humification index Principal component analysis
Unable to display preview. Download preview PDF.
- APHA (American Public Health Association), AWWA (American Water Works Association), & WEF (Water Environment Federation) (2005). Standard methods for the examination of water and wastewater (20th ed.). Washington DC, USA.Google Scholar
- Chen, Y., & ZW, L. (2005). Analysis and evaluation of water environmental carrying capacity in Three Gorges Reservoir. Advances in Water Science, 16(5), 715–719.Google Scholar
- Kaplan, L. A., & Newbold, J. D. (1993). Biogeochemistry of dissolved organic carbon entering streams. In T. E. Ford (Ed.), Aquatic microbiology, an ecological approach (pp. 139–165). Blackwell.Google Scholar
- Kalff, J. (2001). Limnology (pp. 1–592). Englewood Cliffs: Prentice Hall.Google Scholar
- Sharp, E. L., Parsons, S. A., & Jefferson, B. (2004). The effects of changing NOM composition and characteristics on coagulation performance, optimisation and control. Water Science and Technology, Water Supply, 4(4), 95–102.Google Scholar
- Weishaar, J. L., Aiken, G. R., Bergamaschi, B. A., Fram, M. S., Fujii, R., & Mopper, K. (2003). Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon. Environmental Science & Technology, 37(20), 4702–4708.CrossRefGoogle Scholar
- Wetzel, R. (2001). Limnology, lake and river ecosystems. New York: Academic.Google Scholar
- World Commission on Dams (2000). Dams and development, a new framework for decision-making (pp. 8–10, 75–293). Earthscan. London, UK: Earthscan.Google Scholar
- Zhuo, P. J., & Zhao, W. H. (2009). Fluorescence characterization of dissolved organic matter in the east China Sea after diatom red tide dispersion. Spectroscopy and Spectral Analysis, 29(5), 1349–1353.Google Scholar