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Updated: May 15, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
Identifying DOM sources of a closed lake basin in arid and semi-arid regions using Bayesian model and grey influence
Shixiang Zhang1, Qingqian Li1, Dongping Liu2
1Key Laboratory of Estuarine and Coastal Environment of the Ministry of Ecology and Environment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
Abstract:
Complicated replenishment for closed lakes in arid and semi-arid regions induces challenges in tracing the origins of water pollution. It is urgent to identify sources of dissolved organic matter (DOM) for revealing water quality fluctuations. In this study, fluorescence excitation-emission matrix spectrum (EEMs) combined with parallel factor analysis (PARAFAC) and grey influence analysis (GINA) to trace key parameters of end-member mixture analysis (EMMA), by which ratios of DOM sources could be determined in Shahu Lake basin of China. Five components (C1-C5) were extracted by PARAFAC: C1-C2 known as tryptophan-like fluorescence substances (TRLF), C3 defined as microbial metabolites (MM), C4-C5 associated with fulvic-like fluorescence substances (FLF). Total fluorescence intensity in Shahu Lake (465 ± 59 a.u.) was significantly lower than neighbor water bodies (953 ± 179 a.u.), indicating the potential impact of neighbor water bodies. Biological index (BIX), humification index (HIX), freshness index (β: α), and T/F (fluorescence intensity ratio of TRLF and FLF) were selected as optimal indicators by GINA. EMMA results revealed that DOM in Shahu Lake predominantly originates from Wetland (34.6 %) and Diannong River (28.1 %), demonstrating active water exchange between these systems. The identification of DOM sources in a given sampling site could confirm the effectiveness of the combination of the optimal indices for accurate traceability of DOM in Shahu Lake. This integrated analytical framework provided a robust methodology for quantifying proportional contributions of pollution sources in lacustrine systems, particularly in hydrologically closed basins.
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