Stochastic modeling of chlorophyll-a for probabilistic assessment and monitoring of algae blooms in the lower Nakdong River, South Korea

Kue Bum KIM, Min-Kyu JUNG, Yiu Fai TSANG, Hyun-Han KWON

Research output: Contribution to journalArticles

1 Citation (Scopus)

Abstract

Eutrophication is one of the critical water quality issues in the world nowadays. Various studies have been conducted to explore the contributing factors related to eutrophication symptoms. However, in the field of eutrophication modeling, the stochastic nature associated with the eutrophication process has not been sufficiently explored, especially in a multivariate stochastic modeling framework. In this study, a multivariate Hidden Markov model (MHMM) that can consider the spatio-temporal dependence in chlorophyll-a concentration over the Nakdong River of South Korea was proposed. The MHMM can effectively cluster the intra-seasonal and inter-annual variability of chlorophyll-a, thereby enabling us to understand the spatio-temporal evolutions of algal blooms. The relationships between hydro-climatic conditions (e.g., temperature and river flow) and chlorophyll-a concentrations were evident, whereas a relatively weak relationship with water quality parameters was observed. The MHMM enables us to effectively infer the conditional probability of the eutrophication state for the following month. The self-transition likelihood of staying in the current state is substantially higher than the likelihood of moving to other states. Moreover, the proposed modeling approach can effectively offer a probabilistic decision-support framework for constructing an alert classification of the eutrophication. The potential use of the proposed modeling framework was also provided. Copyright © 2020 Elsevier B.V. All rights reserved.
Original languageEnglish
Article number123066
JournalJournal of Hazardous Materials
Volume400
Early online date15 Jun 2020
DOIs
Publication statusE-pub ahead of print - 15 Jun 2020

Citation

Kim, K. B., Jung, M.-K., Tsang, Y. F., & Kwon, H.-H. (2020). Stochastic modeling of chlorophyll-a for probabilistic assessment and monitoring of algae blooms in the lower Nakdong River, South Korea. Journal of Hazardous Materials, 400. Retrieved from https://doi.org/10.1016/j.jhazmat.2020.123066

Keywords

  • Stochastic modeling
  • Latent state
  • Chlorophyll-a concentration
  • Algae blooms
  • Probabilistic approach

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