20180425_The relative importance of water temperature and residence time in predicting...



1. Title, Journal and Authors


Title: The relative importance of water temperature and residence time in predicting cyanobacteria abundance in regulated rivers


Journal: Water Research


Authors: YoonKyung Cha a, Kyung Hwa Cho b, Hyuk Lee c, Taegu Kang d, Joon Ha Kim e, *


a Department of Environmental Engineering, University of Seoul, Seoul, Republic of Korea

b School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea

c Water Quality Assessment Research Division, National Institute of Environmental Research, Incheon, Republic of Korea

d Yeongsan River Environment Research Center, National Institute of Environmental Research, Gwangju, Republic of Korea

e School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea 



2. Summary

 The drivers of bloom formation and abundance in rivers are not well understood. Though a lot of researches have been done, its results are controversial because of the different river environments. This paper tries to reduce the uncertainty from the environments by concluding the sites and time as variable.

 Using Bayesian Hierarchical Model(BHM), the concentration of cyanobacteria is regressed by linear regression which has temperature and residence time as a factor. Sites and time variable are included as a form of the parameter of linear regression.

 There are two points from that model simulation results. The first, temperature and residence time are significantly correlated with cyanobacteria abundance as already none. The second, when river is eutrophic, residence time has almost no effects on cyano-abundance. This means nutrient control must precede the residence time control to prevent the algal bloom.



3. Application to research

 This research find the confounding effect of sites and time variability to cyanobacteria abundance. But the model is not made. So I’d like to write the paper by developing the concepts of this paper.




4. Contact

 Sung Ho Shin (Ph.D. program)


Environmental Systems Engineering Lab.


School of Environmental Science & Engineering


Gwangju Institute of Science and Technology


1 Oryong-dong Buk-gu Gwangju, 500-712, Korea



Phone : +82-10-6634-8614


E-mail : hogili89@gist.ac.kr

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