A Study on Enhancement of Water Balance Analysis with Operating of Agricultural Water Monitoring Network

Transcription

1 한국관개배수논문집제 20 권제 2 호 KCID J. Vol. 20 No. 2 ( ) pp. 230~239 A Study on Enhancement of Water Balance Analysis with Operating of Agricultural Water Monitoring Network 김필식 * 김선주 ** 권형중 *** 최규훈 **** Kim Philshik Kim Sunjoo Kwon Hyungjoong Choi Gyuhoon Abstract The objective of this study is to analyze water balance characteristics with observed and calculated hydrological components. The existing data at reservoir and irrigation canal such as amounts of water supplies, reservoir storage, precipitation, discharge were collected for 4 years at study area. Also, observed water-level data from additional monitoring gauges were collected and converted to amounts of discharge. These newly gauges were installed at weir of reservoir inlet, outlet and each part of irrigation canal. Then, to derive the effect of additional gauges, comparison was conducted through the water balance analysis with the data from exiting gauges only versus the data from exiting and additional gauges. As a result, the accuracy of water balance assessment was improved when using the data from monitoring network (exiting and additional gauges showed reasonable results rather than only using existing gauges). According to this study, we could find out the influence of additional facilities to water balance calculation, and routing of discharged water for irrigation. Furthermore, necessity of accurate observed data was emphasized to reduce the uncertainty and errors of water supplies and reservoir managements. Ⅰ * 건국대학교사회환경시스템공학과연구교수 (kimps@konkuk.ac.kr) ** 건국대학교사회환경시스템공학과교수 ( 교신저자 : sunjoo@konkuk.ac.kr) ***( 주 ) 유일기연기술연구소책임연구원 (kwonhj@yooileng.co.kr) ****( 주 ) 아이에스테크놀로지기술영업팀부장 (ghchoi@sondar.co.kr) 키워드 : Irrigation Water, Water Balance Analysis, Hydrologic Measurement, Monitering Network

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3 Ⅱ. Fig. 1. The Location of Study Area

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6 Table 1. Water Balance Analysis Results from Reservoir(2012 Year) Month Monitoring Observed Volume Change of Res. 1 (1,000 m3 ) Gauge E1 Rainfall 2( m3 ) Irrigation Water Supply 3( m3 ) Gauge Assumed Unused Flow 4 (1,000 m3 ) Measured Unused Flow ❹ (1000 m3 ) Gauge N1 Evaporation 5( m3 ) Inflow of Res. by HOMWRS 6( m3 ) Assumed Volume Change of Res. 7 (1,000m3) 2+6- Difference Between Obs. and Assum. 8 (1,000 m3 ) E2+E3 3-4 (❹) , , , , , , , , , , Gauge , , , , E1, E2, E3 5 1, , , , , ,931, , , , ,051, , , , ,589, , , , , , ,712, , Gauges , , , ,981, , , E1, E2, , , ,054, E3, N , , , ,164, , , ,018, Table 2. The Annual Difference Between Observed and Assumed Volume Change of Reservoir(Absolute Value) Period Observed Volume Change of Res. 1 (1000m3) Assumed Volume Change of Res. 2 (1000m3) Difference 3 (1000m3) Difference Ratio (%) 1-2 (3/1) Apr.~Sep. 2,229 6,609-4, Apr.~Sep. 1,521 95,525-94,003 6, Apr.~Sep. 1,144 8,997-7, Apr.~Jul. 3, , ,557 14,326 Aug.~Sep ,159-1,

7 Table 3. Water Balance Results from Hoejuk Irrigation Canal(2012 Year) Month Monitoring Water Supply of Hoejuk Inflow 1( m3 ) Mandi Flow 2( m3 ) Hoejuk Outflow ❸( m3 ) Gauge E2 Gauge E5 Gauge N5 Irrigation Requirement by HOMWRS 4( m3 ) Rainfall 5( m3 ) Canal Loss ( m3 ) 6 (1-2)+ Water Balance 7( m3 ) (2-❸) ,606, ,606, , , , , ,366, ,366,000.0 Gauges 4 16, , ,032, ,936, , ,080,250.0 E2, E5 5 12, , ,186, , , ,297, , , ,180, , ,166, , , ,216, , ,201, , , ,501, ,466, , ,979, , , ,738, ,652, , ,931,250.9 Gauges ,724, ,723,945.3 E2, E5, N ,884, ,883, , ,592, , ,588,199.8

8 Table 4. Water Balance Results from Gumgok Irrigation Canal(2012 Year) Month Monitoring Water Supply of Gumgok Inflow 1( m3 ) Branched ❷( m3 ) Hoejuk Bridge ❸( m3 ) Gumgok Gate 4( m3 ) Gumgok Outflow ❺( m3 ) Gauge E3 Gauge N2 Gauge N3 Gauge E4 Gauge N4 Irrigation Requirement by HOMWRS 6( m3 ) Rainfall 7( m3 ) Canal Loss ( m3 ) 8 (1-❷)+ (❷-❸)+ ❸-4)+ Water Balance 9( m3 ) (4-❺) , , , , , , , , , ,733, , ,758,763.3 Gauges 4 99, , ,540, ,733, , ,707,666.7 E3, E4 5 61, , ,066, , , ,605, , , ,653, , ,618, , , ,473, , ,438, , , , , , ,886, ,066, , ,202, Gauges 37, , , , , ,273, ,800, , ,548, E3, E4, 0.0 9, , ,266, , ,260, N2, N3, N , , ,600, , ,586, , , , ,466, , ,454,182.1 Table 5. The Annual Difference of Water Balance Results from Hoejuk Irrigation Canal Period Water Supply 1 ( m3 ) Hoejuk Line Absolute Value of Water Balance 2 ( m3 ) Water Balance Ratio (%) (2/1) April-September 81, ,266, , April-September 262, ,016,680 64, April-September 24,000 95,318, , April-July 59, ,744, ,147 August-December 33,425 16,910,531 50,592

9 Table 6. The Annual Difference of Water Balance Results from Gumgok Irrigation Canal Period Water Supply 1 ( m3 ) Gumgok Line Absolute Value of Water Balance 2 ( m3 ) Water Balance Ratio (%) (2/1) April-September 83,300 58,525,886 70, April-September 249,280 77,119,126 30, April-September 6,750 43,520, , April-July 230,350 79,121,112 34,348 August-December 72,270 7,751,462 10,726 Ⅳ.

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