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The data for cyanobacteria cell count (cells/mL) were obtained from cyanobacteria monitoring sites (https://water.nier.go.kr/). Total cyanobacteria cell count was calculated by summing the cell counts of the four major cyanobacteria genera that form HABs in South Korea, i.e., Microcystis, Dolichospermum (Anabaena), Oscillatoria, and Aphanizomenon. Data for environmental variables relevant to HAB occurrences were obtained from multiple sources (Table 2). The water quality variables were obtained from the nearest water quality monitoring sites (https://water.nier.go.kr/). The water quality variables included as input features were water temperature (Wtemp; °C), total phosphorus (T-P; mg/L), total nitrogen (T-N; mg/L), PO4-P (mg/L), NO3-N (mg/L), TOC (mg/L), and SS (mg/L). The meteorological variables include daily precipitation (Prec; mm), total irradiance (Irr; MJ/m2), and average wind speed (Wspeed; m/s), and the corresponding data were obtained from the nearest automated surface observing system station (https://data.kma.go.kr/).

Table 2

Data description and summary statistics (mean (S.D.))

Variables (unit)AbbreviationAngyeDaecheongGwanggyoJinyangPaldangSayeonUnmunYeongcheon
Water temperature (°C) Wtemp 23.82
(2.85) 		23.00
(2.79) 		24.31
(2.04) 		18.56
(3.79) 		23.34
(1.89) 		26.02
(2.79) 		21.43
(4.16) 		24.08
(3.06) 
Daily precipitation (mm) Prec 9.32
(23.47) 		14.72
(32.11) 		10.35
(23.13) 		6.96
(15.49) 		7.85
(20.52) 		4.31
(11.03) 		6.44
(14.99) 		10.02
(24.3) 
Irradiance (MJ/m2) Irr 12.14
(6.56) 		15.90
(6.92) 		13.22
(6.72) 		13.77
(6.6) 		13.71
(5.93) 		11.73
(4.8) 		14.67
(6.38) 		12.42
(6.59) 
Average wind speed (m/s) Wspeed 2.49
(1.13) 		1.43
(0.52) 		1.75
(0.71) 		1.02
(0.4) 		1.89
(0.69) 		2.20
(0.84) 		1.98
(0.75) 		2.54
(1.2) 
Total phosphorus (mg/L) T-P 0.01
(0) 		0.03
(0.02) 		0.06
(0.03) 		0.04
(0.02) 		0.05
(0.04) 		0.04
(0.01) 		0.02
(0.01) 		0.02
(0.01) 
Total nitrogen (mg/L) T-N 1.15
(0.14) 		1.80
(0.54) 		1.66
(0.45) 		1.29
(0.33) 		2.1
(0.46) 		1.38
(0.59) 		1.44
(0.45) 		1.38
(0.1) 
Phosphate (mg/L) PO4-P 0.01
(0) 		0.00
(0.00) 		0.03
(0.02) 		0.01
(0.01) 		0.01
(0.02) 		0.01
(0.01) 		0.01
(0.01) 		0.01
(0) 
Nitrate nitrogen (mg/L) NO3-N 0.83
(0.26) 		0.74
(0.29) 		0.75
(0.51) 		0.4
(0.23) 		1.71
(0.41) 		0.46
(0.36) 		1.10
(0.3) 		0.97
(0.3) 
Total organic carbon (mg/L) TOC 3.67
(0.43) 		2.88
(0.57) 		4.68
(1.34) 		2.89
(0.62) 		2.55
(0.49) 		3.67
(0.68) 		2.23
(0.39) 		4.1
(0.55) 
Variables (unit)AbbreviationAngyeDaecheongGwanggyoJinyangPaldangSayeonUnmunYeongcheon
Water temperature (°C) Wtemp 23.82
(2.85) 		23.00
(2.79) 		24.31
(2.04) 		18.56
(3.79) 		23.34
(1.89) 		26.02
(2.79) 		21.43
(4.16) 		24.08
(3.06) 
Daily precipitation (mm) Prec 9.32
(23.47) 		14.72
(32.11) 		10.35
(23.13) 		6.96
(15.49) 		7.85
(20.52) 		4.31
(11.03) 		6.44
(14.99) 		10.02
(24.3) 
Irradiance (MJ/m2) Irr 12.14
(6.56) 		15.90
(6.92) 		13.22
(6.72) 		13.77
(6.6) 		13.71
(5.93) 		11.73
(4.8) 		14.67
(6.38) 		12.42
(6.59) 
Average wind speed (m/s) Wspeed 2.49
(1.13) 		1.43
(0.52) 		1.75
(0.71) 		1.02
(0.4) 		1.89
(0.69) 		2.20
(0.84) 		1.98
(0.75) 		2.54
(1.2) 
Total phosphorus (mg/L) T-P 0.01
(0) 		0.03
(0.02) 		0.06
(0.03) 		0.04
(0.02) 		0.05
(0.04) 		0.04
(0.01) 		0.02
(0.01) 		0.02
(0.01) 
Total nitrogen (mg/L) T-N 1.15
(0.14) 		1.80
(0.54) 		1.66
(0.45) 		1.29
(0.33) 		2.1
(0.46) 		1.38
(0.59) 		1.44
(0.45) 		1.38
(0.1) 
Phosphate (mg/L) PO4-P 0.01
(0) 		0.00
(0.00) 		0.03
(0.02) 		0.01
(0.01) 		0.01
(0.02) 		0.01
(0.01) 		0.01
(0.01) 		0.01
(0) 
Nitrate nitrogen (mg/L) NO3-N 0.83
(0.26) 		0.74
(0.29) 		0.75
(0.51) 		0.4
(0.23) 		1.71
(0.41) 		0.46
(0.36) 		1.10
(0.3) 		0.97
(0.3) 
Total organic carbon (mg/L) TOC 3.67
(0.43) 		2.88
(0.57) 		4.68
(1.34) 		2.89
(0.62) 		2.55
(0.49) 		3.67
(0.68) 		2.23
(0.39) 		4.1
(0.55) 
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