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1 NK umeda@wec.or.jp ADCP ADCP1 Key Words: destratification system, intrusion, ADCP, reservoir, water quality, water bloom 1) 1),2),3) 11),12) 13) 1m 14) 4m 2 4),5),6),7) 15) 16) Lorenzen and Mitchell 8) 9)

2 ADCP (Acoustic Doppler Current Profiler) m ) Nm 3 /min 図 -1.5 m 3 /s 4.38 m 3 /s 1km 4.31m 3 /s 22m 3 /s ADCP T1 5m T4 T5 A1 T3 A2 222m 232m El.242m a) ADCP(Acoustic Doppler Current Profiler : RD- Instruments 6kHz 図 -1 T1 T5 2 5m 1 ACL-2PDK b) 図 -1A1 A ADCP ADCP 1m Onset StowAway Tidbit ADCP 図 -2 1 ADCP 図 -3 ADCP ADCP 図 -2 ADCP 図 -2 T2 N A3 図 -1

3 El.242.9m [EL.m] El.224m ADCP El.223m -4 5m 75m 図 -2 A1 5m [m 3 /s] [m 3 /s] /2 7/21 7/22 7/23 図 -4 5m 図 -3 14) ADCP 7 ADCP 図 A1 8m -A2 15m c) KW-I a ph.5m 2.5m 2.5m 8 a) 図 -4 1m 3 /s 9 21m 3 /s 3m/s 図 -6 13m 2m 223m b) 図 -5(a) -T1 ADCP

18) 図 -5(a) -1 2 8-4 4 1m -4 3m 図 -7 3 4 3 A B 2 A 1m B 2 3m A B B 14) 2 B 227 m A 図 -5(a) 図 -5(b) -T2-5 6 2-6 1m 22.5 図 -6 232m [El.

4 18) 図 -5(a) m -4 3m 図 A B 2 A 1m B 2 3m A B B 14) 2 B 227 m A 図 -5(a) 図 -5(b) -T m 22.5 図 m [El. m] 22 [ ] (242.7m) (223m) T1 T5 A2 図 [m] 図 -5(a) T1-6 [m] [m] 1 [cm/s] [m] 図 -6(b) T2

5 N カラム A カラム B EL.239.7m [m/s].2.2 [m/s].2 EL..7m EL..7m.1m/s A B 3m 図 m 図 -5(a)-5 a) 図 -8 Chl-a Chl-a 8.5m ph 9 図 ,4,5,8 8 EL.223.m.5m ( 84 m 3 /s, 19) β=.39) ( 478m 3 /s, β=1.16) a 1µg/l 2 3µg/l ph Chl-a b) 図 A1 図 -9 図 -5 図 -9b) 図 m 図 -9b)

6 [m3/s] [m] [m] /17 8/27 9/6 9/16 9/ Water Temperature Chl-a a) ダム諸量 [m 3 /s] [m] b) 流速分布 ( 測点 -A1) 8/23 8/25 8/27 8/29 8/31 c) 流速分布 ( 測点 -A2) ph [ ] /17 8/27 9/6 9/16 9/26 図 -8 図 -9 c) A2 A2 A1 5 -A2-8 -A1 c) [m] 8/23 8/25 8/27 8/29 8/ [cm/s] 図 A1 A2 [ ] [El. m] (241.6m) (223m) 22 図 -1 -A 図 A

7 a) ダム諸量 [m 3 /s] b) 流速分布 ( 測点 -A1) a) ダム諸量 [m 3 /s] b) 流速分布 ( 測点 -A1) [m] [m] 9/17 9/19 9/21 9/23 9/25 c) 水温分布 ( 測点 -A1) [m] /17 9/19 9/21 9/23 9/25 図 -11 -A 図 -9 図 -11c) m 2 3 d) 2 図 /6 9/8 9/1 9/12 9/ [cm/s] 図 -12 -A 図 ADCP 図 -

8 9 図 ADCP 図 -13 図 -14a) 図 -14a) 図 -14b) 図 -14c) A-1.2m ) 2) 21) [cm/s] 5 5 [m] 図 -13 ADCP a) 2 A1 図表 m 3 /s -A1 A2 A3 3 図

9 [El.m] [ ] [m 3 /s] a) b) c) A 1 [El. m] /11 16: 9/12 16: 9/13 16: /23 8/25 8/27 8/29 8/31 図 -14 図 -16 3m 3 /s Asaeda et al. 22) 1/5 g Qw( z) =.32Q B z 2 Q (1) B Q W [m 3 /s] Q B [m 3 /s] z [m] g [m/s 2 ] Q B =3.7[m 3 /min] z =7.5[m] g=9.8[m/s 2 ] Q W =2.2[m 3 /s] z 表 m (1) 1.5 4/3 [El. m] 22 9/21 16: 9/22 16: 9/23 16: 図 -15 A A1 A3 A3 (1) 22) b)

10 [h] 表 -1 [ ] [m] [m] [m 3 ] [m 3 /s] 21/9/ /9/ [El.m] [ ] [ ] /9/11 16: 21/9/12 : 22 A1 A2 A3 図 -16 ADCP 図 T3 T4 T5 表 -2 (1) 8.1m 3 /s 4 2 (1) 12) (1) 4 表 (1) 表 -2 4 ADCP 図 -17 ADCP 4 QI = UiRi z (2) i Q I i U i i z ADCP.5m U i 図 -13 R i i 図 -17 T3 28m R i 28m 図 -1832m 3 /s (1) 4 表 -2 4

m] [cm/s] 1 5-5 -1 22 a) T3 1 2 3 22 b) T4 1 2 22 c) T5 1 2 [m] 図 -17 表 -2 図 -18 15 2m 3 /s

11 [El.m] [El.m] [El.m] [cm/s] a) T b) T c) T5 1 2 [m] 図 -17 表 -2 図 m 3 /s 図 -18 図 -11 図 -12 図 -18 表 -2 T3 T4 T5 (3) (5) 12) 23) E t1 z1 E = ρ ( T ) gz A( z) dzdt (3) t z e ( ) e= ( t t ) ρ( T) Q gh ln 1+ z H (4) 1 B A A [m 3 /s] 表 -2 ADCP 21/7/21 T3 37 m 3 /s 21/7/21 T4 29 m 3 /s 21/7/21 T5 33 m 3 /s /23 8/25 8/27 8/29 8/31 図 -18 ADCP η η = Ee (5) ρ(t, T) t T [kg/m 3 ] A(z) z [m 2 ] H T +[m] z [m] H A [m] η N[1/s] P N 3 4 NHT PN = (6) Qg B 図 ) 2 図 (4) 8 図図図 -19 4

12 η P N 図図 m 239m 9/11 16:.1 9/12 16: 9/13 9/14 16: 16: 3.2m /21 16:.1 [ ] 9/22 16: 9/23 16: [ ] 1) 2) 3) /24 16: 25 2 [ ] [ ] 図

13 1) Asaeda, T., Priyantha, D. G. N., Saith, S. and Gotoh, K. A new technique for controlling algal blooms in the withdrawal zone of reservoirs using vertical curtains Ecological Engineering Vol.7 pp.95 14, ) No. 143 pp ) No. 181 pp ) Vol. 26 pp ) Vol. 27 pp ) Vol. 39 pp ) Vol. 13, pp ) Lorenzen, M. and Mitchell, R.: Theoretical effects of artificial destratification on algal production in impoundments, Environmental Science & Technology, Vol. 7, pp , ) 9 3F-P47 pp ) Vol. 26, pp ) McDougall, T. J.: Bubble plumes in stratified environments, Journal of Fluid Mechanics, Vol. 85, pp , ) Asaeda, T. and Imberger, J.: Structure of bubble plumes in linearly stratified environments, Journal of Fluid Mechanics, Vol. 249, pp , ) Vol. 32, pp ) Vol. 37 pp ) Vol. 38 pp ) Vol. 47 pp ) No. 193 pp ) ADCP Vol. 41 pp ) 18 pp ) Vol.43 pp ) 411 /II-12 pp ) Asaeda, T., Imberger, J., and Ikeda, H. Bubble plume behavior in twolayered environmentsvol.2 pp ) Imberger, J. Bubble Plume 411 / -12 pp ( 受付 )

14 FIELD MEASUREMENTS OF FLOW FIELD CAUSED BY DESTRATIFICATION SYSTEM IN A DAM RESERVOIR Makoto UMEDA, Kikuko MIYAZAKI and Seiji TOMIOKA Field measurements were conducted to investigate hydraulic environmental changes caused by destratification systems. The measurements were designed to observe the following three points: 1) spatial distribution of flow field using a ADCP equipped to a boat. 2) time series of current profile at stations near bubblers. 3) water temperature monitoring to observe thermal stratification. These observations revealed interesting behaviors of intrusion. The depth of intrusion responses to diurnal changes of surface water temperature because of the entrainment around water surface. Flow volume of intrusion was influenced by all the bubble plumes and their accompanying current.

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