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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,

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Presentation on theme: "Water balances between upper dam and lower estuary reservoir in South Korea – Case of Boryeong dam and Busa esturary reservoir Jaekyoung Noh, Daesik Kim,"— Presentation transcript:

1 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 / 7 th Asian Regional Conference, ICID Droughts, Floods, Environment: Managing Consumptive Water Needs Sustainably 27 June 2012 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 ( )

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) Year April 4, , ,2001,5002,1001,4004,800 May ,0001,5001,8002,4001,4001,900

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

19 General one parameter equation of ONE hydrologic model

20 Daily inflows using general one parameter (Daecheong dam, )

21 One year (Daecheong dam, 1998)

22 Comparison of dekadal inflows (Daecheong dam, )

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 ( )

26 Comparison of daily inflows

27 Comparison of dekadal inflows to Boryeong dam ( )

28 Domestic water 200,000 m 3 /d, paddy field area ha, industrial water m 3 /d, instreamflow 0.38 m 3 /s Daily irrigation water ( ) from Boryeong dam

29 Domestic water 200,000 m 3 /d, paddy field area 1,039.5 ha, industrial water 15,000 m 3 /d, instreamflow 0.38 m 3 /s Reliability 95.6%

30 Domestic water 226,100 m 3 /d, paddy field area 1,039.5 ha, industrial water 79,100 m 3 /d, instreamflow 0.38 m 3 /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 + DW r – AWbr + AW r br + AW r bs 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×( (h )) –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 ( )

41 Case of 2011

42 Long term simulation in Busa - inflow ( )

43 Inflow ( )

44 Water storages ( )

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.

51


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