water balances between upper dam and lower estuary reservoir in south korea – case of boryeong dam...
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Water balances between upper dam and lower estuary reservoir in South Korea
– Case of Boryeong dam and Busa esturary reservoir
Jaekyoung Noh, Daesik Kim, Jaenam Lee
Irrigation Australia / 7th Asian Regional Conference, ICIDDroughts, Floods, Environment: Managing Consumptive Water Needs Sus-tainably
27 June 2012
Dept. of Agricultural and Rural Engineering, Chungnam National University
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Background and objective
• High salinity of the Busa estuary reservoir in Korea, from which are being irrigated to upper paddy fields in transplanting period.
• Inflow to Busa reservoir are restricted to outflows from upper Boryeong dam.
• To develop models for water balances of Boryeong dam and Busa estuary reservoir, from which will be used to plan counter measures on high salinity in Busa reservoir.
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Sites
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Land uses
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DEMs
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Area capacity curves
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Boryeong multipurpose dam on 18:30 14 June 2012
Busa estuary reservoir on 15:40 14 June 2012
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Meteorological Data
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Rainfalls (1973-2011)
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Weirs for irrigation and thermal power plant
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Weirs for suppling water to thermal power plant
Boryeong power plant
Seocheon power plant
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Salinity (ppm)
Year 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
April 4,300 100 400 1,200 800 1,200 1,500 2,100 1,400 4,800
May 790 150 550 850 1,000 1,500 1,800 2,400 1,400 1,900
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2009
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2010
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2011
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Water levels in Busa
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Inflows
DAWAST model (Noh, 1991)
TPHM model (Kim, 2002)
Parameter: UMAX, LMAX, FC, CP, CE
Parameter: Smax, α
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S
Q
ETa
P
Q = f(e-k2 Sα) S
Eta = f(e-k1 S) ETo
One parameter : α
ONE(One parameter New Exponential) Hydrologic Model
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General one parameter equation of ONE hydrologic model
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Daily inflows using general one pa-rameter (Daecheong dam, 1981-2001)
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One year (Daecheong dam, 1998)
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Comparison of dekadal inflows (Daecheong dam, 1981-2001)
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Water balance in Boryeong dam
• S(i) = S(i-1) + Q(i) – EW(i) – SQ(i)• SQ(i) = DW(i) + IW(i)+ AW(i) + MW(i)
– S: water storage– O: inflow– SQ: water supply– EW: evaporation in water surface– DW: domestic water– IW: industrial water– AW: agricultural water– MW: instreamflow
• OV(i) = S(i) – FS, if H(i)>FH– OV: overflow– FS: full water storage– FH: full water level
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Daily operation result of Boryeong dam
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Daily inflow to Boryeong dam (1998-2011)
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Comparison of daily inflows
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Comparison of dekadal inflows to Boryeong dam (1998-2011)
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Domestic water 200,000 m3/d, paddy field area 1039.5 ha, industrial water 15000 m3/d, instream-
flow 0.38 m3/s
Daily irrigation water (1966-2011) from Boryeong dam
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Domestic water 200,000 m3/d, paddy field area 1,039.5 ha, industrial water 15,000
m3/d, instreamflow 0.38 m3/s
Reliability 95.6%
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Domestic water 226,100 m3/d, paddy field area 1,039.5 ha, industrial water 79,100
m3/d, instreamflow 0.38 m3/s – present con-dition
Reliability 79.6 %
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Water balance of Busa reservoir
• Inflow to Busa (QIbs) = SQ from Bo-ryeong (SQbr)+ QI from lateral
• SQ from Boryeong = IW + AW + MW + FW + OV
• QI from lateral = Q – IW + DWr – AWbr + AWrbr + AWrbs
• IW = IWsh (Seohae) + IWbr (Bo-ryeong)
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• S(i) = S(i-1) + QIbs(i) + SQbr(i) – SQbs(i) - EWbs(i) – GW(i) – AWbs(i) – AWnp(i)
• SQbs = 1000×(-385.2 + 3527.9 (h + 1.5)) – h: water level of
Busa (EL.m)
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Water level to outflow of Busa
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Dropped water level to Outflow from Busa
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Water levels in Busa reservoir
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Inflow to Busa reservoir- Outflow from Boryeong dam
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Lateral inflow
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Inflow to Busa
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Comparison of irrigated waters from Busa
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Daily simulated water storages in Busa (2009-2011)
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Case of 2011
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Long term simulation in Busa- inflow (1966-2011)
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Inflow (1998-2011)
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Water storages (1998-2011)
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Salinity to inflow
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Inflows during salinity data period
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Comparison of salinities in Busa
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Water storages during salinity data period
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Water storage to salinity
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Conclusion
• Water balance models were con-structed.
• Upper Boryeong dam had not enough capacity to supply various waters.
• Water storages of lower Busa reser-voir were well fitted to observed data.
• Using these developed models, up-per dam and lower reservoir will be able to operate effectively in high salinity period.
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