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Jaekyoung Noh, Daesik Kim, Jaenam Lee

Irrigation Australia / 7 th Asian Regional Conference, ICID Droughts, Floods, Environment: Managing Consumptive Water Needs Sustainably. Water balances between upper dam and lower estuary reservoir in South Korea – Case of Boryeong dam and Busa esturary reservoir. 27 June 2012.

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Jaekyoung Noh, Daesik Kim, Jaenam Lee

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  1. Irrigation Australia / 7th Asian Regional Conference, ICID Droughts, Floods, Environment: Managing Consumptive Water Needs Sustainably Water balances between upper dam and lower estuary reservoir in South Korea – Case of Boryeong dam and Busaesturaryreservoir 27 June 2012 Jaekyoung Noh, Daesik Kim, Jaenam Lee Dept. of Agricultural and Rural Engineering, Chungnam National University

  2. 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.

  3. Sites

  4. Land uses

  5. DEMs

  6. Area capacity curves

  7. Boryeong multipurpose dam on 18:30 14 June 2012 Busa estuary reservoir on 15:40 14 June 2012

  8. Meteorological Data

  9. Rainfalls (1973-2011)

  10. Weirs for irrigation and thermal power plant

  11. Weirs for suppling water to thermal power plant Boryeong power plant Seocheon power plant

  12. Salinity (ppm)

  13. 2009

  14. 2010

  15. 2011

  16. Water levels in Busa

  17. Inflows DAWAST model (Noh, 1991) TPHM model (Kim, 2002) Parameter: UMAX, LMAX, FC, CP, CE Parameter: Smax, α

  18. ONE(One parameter New Exponential) Hydrologic Model P ETa Eta = f(e-k1 S) ETo Q Q = f(e-k2 Sα) S S One parameter : α

  19. General one parameter equation of ONE hydrologic model

  20. Daily inflows using general one parameter (Daecheong dam, 1981-2001)

  21. One year (Daecheong dam, 1998)

  22. Comparison of dekadal inflows (Daecheong dam, 1981-2001)

  23. 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

  24. Daily operation result of Boryeong dam

  25. Daily inflow to Boryeong dam (1998-2011)

  26. Comparison of daily inflows

  27. Comparison of dekadal inflows to Boryeong dam (1998-2011)

  28. Domestic water 200,000 m3/d, paddy field area 1039.5 ha, industrial water 15000 m3/d, instreamflow 0.38 m3/s Daily irrigation water (1966-2011) from Boryeong dam

  29. 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%

  30. 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 condition Reliability 79.6 %

  31. Water balance of Busa reservoir • Inflow to Busa (QIbs) = SQ from Boryeong (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 (Boryeong)

  32. 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)

  33. Water level to outflow of Busa

  34. Dropped water level to Outflow from Busa

  35. Water levels in Busa reservoir

  36. Inflow to Busa reservoir- Outflow from Boryeong dam

  37. Lateral inflow

  38. Inflow to Busa

  39. Comparison of irrigated waters from Busa

  40. Daily simulated water storages in Busa (2009-2011)

  41. Case of 2011

  42. Long term simulation in Busa- inflow (1966-2011)

  43. Inflow (1998-2011)

  44. Water storages (1998-2011)

  45. Salinity to inflow

  46. Inflows during salinity data period

  47. Comparison of salinities in Busa

  48. Water storages during salinity data period

  49. Water storage to salinity

  50. Conclusion • Water balance models were constructed. • Upper Boryeong dam had not enough capacity to supply various waters. • Water storages of lower Busa reservoir were well fitted to observed data. • Using these developed models, upper dam and lower reservoir will be able to operate effectively in high salinity period.

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