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:
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
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.
Comparison of dekadal inflows (Daecheong dam, 1981-2001)
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
Comparison of dekadal inflows to Boryeong dam (1998-2011)
Domestic water 200,000 m 3 /d, paddy field area 1039.5 ha, industrial water 15000 m 3 /d, instreamflow 0.38 m 3 /s Daily irrigation water (1966-2011) from Boryeong dam
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%
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 %
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)
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.