Suspended sediment transport diversity in river catchments following the 2014 phreatic eruption at Ontake Volcano, Japan

Kataoka, Kyoko S.; Matsumoto, Takane; Saito, Takeshi; Nagahashi, Yoshitaka; Iyobe, Tsutomu

doi:10.1186/s40623-019-0994-x

Earth, Planets and Space

Table 1 Water characteristics, discharge, suspended sediment concentration, and turbidity after the 2014 September eruption

From: Suspended sediment transport diversity in river catchments following the 2014 phreatic eruption at Ontake Volcano, Japan

River name	Date	Time	Electrical conductivity (mS/m)	pH	Temp. (°C)	Discharge (m³/s)	Time of discharge	Suspended sediment (s.s.)* (g/l)	s.s. excluding > 2 mm particles (g/l)	Time of s.s.	Visual turbidity	Water input (mm)**	Color
Akagawa River	12 November 2014	12:40	248.0		7.3						Turbid (thick)	5.1	Gray
	13 November 2014	16:00	226.0		1.3			7.320	6.912	16:50	Turbid (thick)	5.1	Gray
	26 December 2014	14:30	263.0	3.63	1.8			0.216	0.216	14:40	Slightly turbid	0
	9 February 2015	16:10	268.0	2.59	0.6	0.135	16:40	0.556	0.556	16:10	Slightly turbid	0
	15 April 2015	13:20	89.6	3.15	3.6	1.018	13:20	0.304	0.304	13:30	Slightly turbid	72.5
	16 April 2015	12:10	82.3	3.30	8.3	0.560	12:10				Slightly turbid	22
	19 May 2015	12:50	111.0	3.13	9.6	1.006	13:00	13.880	9.768	12:50	Turbid	117.5	Gray
	29 May 2015	10:30	63.6	3.42	10.3	0.234	10:30	0.070	0.070	10:30	Slightly turbid	0
	29 May 2015	18:20	84.2	3.24	9.9	0.275	18:20	2.407	2.407	18:20	Turbid	0	Gray
	30 May 2015	11:00	70.9	3.32	13.7						Slightly turbid	0.6
	30 May 2015	15:20	117.0	3.08	11.4			2.410	2.410	15:20	Turbid	0.6	Gray, at loc. S118
	30 May 2015	17:50	77.1	3.28	11.4							0.6
	31 May 2015	10:30	109.3	3.05	13.5	0.217	10:20	1.206	1.206	10:30	Turbid	0.6	Gray
	16 July 2015	16:40	206.0	2.67	16.0	0.253	16:40	2.405	2.355	16:30	Turbid	48.8	Gray
	17 July 2015	10:50	247.0	2.74	16.2	0.545	11:00	7.579	7.579	11:10	Turbid	77.6	Gray
	28 September 2015	16:10									Clear	0
	29 September 2015	11:10	102.0	3.20	12.2						Clear	0
	29 September 2015	13:10	53.5	3.52	12.5	0.232	13:50	0.013	0.013	13:50	Clear	0
	10 November 2015	11:10	103.2	3.11	9.6	0.304	11:10	0.035	0.035	11:20	Clear	0
	10 November 2015	12:50	34.6	3.56	13.0						Clear	0
	26 April 2016	11:40	59.3		11.0	0.206	11:10	0.014	0.014	11:40	Clear	0
	26 April 2016	15:40	132.5	2.86	11.0						Turbid	0	Light gray
	26 April 2016	16:20	120.7	2.90	10.3	0.521	17:10	0.660	0.660	17:20	Turbid	0	Light gray
	25 July 2016	12:00	60.1	3.28	12.0	0.150	12:20	0.020	0.020	12:30	Clear	3.1
Shirakawa River	12 November 2014	12:50	34.3		9.5						Clear	5.1
	15 April 2015	14:00	25.2	5.23	6.3	0.879	13:50	0.022	0.022	13:50	Clear	72.5
	31 May 2015	11:30	31.0	4.93	13.4	0.419	11:30	0.002	0.002	11:30	Clear	0.6
	16 July 2015	17:00	35.8	4.50	14.8	0.456	17:00	0.005	0.005	17:00	Clear	48.8
	17 July 2015	11:30	36.2	3.92	14.6	0.417	11:40	0.288	0.288	11:40	Slightly turbid	77.6	Light yellow–brownish gray
	29 September 2015	14:10	29.8	5.00	12.2	0.414	14:20	0.002	0.002	14:20	Clear	0
	10 November 2015	12:10	31.3	4.97	10.9	0.413	12:00	0.097	0.082	12:10	Clear	0
	26 April 2016	11:40	31.0		10.9	0.430	11:20	0.001	0.001	11:40	Clear	0
	26 April 2016	16:10	31.6	4.85	9.4						Clear	0
	25 July 2016	13:00	34.3	4.74	12.4	0.394	12:50	0.003	0.003	13:10	Clear	3.1
Nigorigawa River (at confluence of the Akagawa and Shirakawa)	12 November 2014	12:20	140.7		8.8						Turbid	5.1	Gray
	15 April 2015	15:10	57.7	3.39	4.7			0.147	0.147	15:10	Slightly turbid	72.5
	17 July 2015	12:10	125.7	3.07	15.2			2.422	2.407	12:20	Turbid	77.6	Gray
	29 September 2015	15:30	4.0	3.82	11.7						Clear	0
	10 November 2015	13:50	69.1	3.36	10.9						Clear	0
	26 April 2016	9:50									Clear	0
	26 April 2016	16:40	80.0	3.13	10.0						Turbid	0	Light gray

*Samples including coarser fraction when relative water discharge is high, i.e., particles transported in saltation also trapped in a sampling bottle
**At the Tanohara rain gauge; 48-h total input

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