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손성호,정상옥,Sohn , Seung-Ho,Chung , Sang-Ok 한국농공학회 2004 한국농공학회논문집 Vol.46 No.5
The objective of this study is to develop water saving irrigation method using water balance model in order to save rural water. Daily water balance components such as irrigation water, drainage water, effective rainfall, ET, and infiltration were measured in paddy fields. Model simulations were performed for different outlet heights and ponding depths. The outlet heights and the ponding depths are 2 cm, 4 cm, 6 cm, 8 cm, and 10 cm, respectively. Based on the simulation very shallow ponding depth of 2 cm with 10 cm outlet height showed the largest effective rainfall ratio and the smallest irrigation amount. Until the introduction of laser leveling dozer and automatic inlet control devices, it would be desirable to adopt 4cm ponding depth because of difficulty of land leveling and frequency of farmer's field visit. The results of this study will be applied in the paddy farming and can improve water use efficiency.
손성호 ( Sohn Seung-ho ),박기중 ( Park Ki-jung ),정상옥 ( Chung Sang-ok ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
The purpose of this study was to investigate the effects of ponding depth treatment on evapotranspiration in paddy fields. Three ponding depth treatments, very sallow, shallow, and deep were used. The experimental plots were three 80m×8m rectangular plots. Daily values of rainfall amount, ponding depth, irrigation water, drainage water, evapotranspiration, and infiltration were measured in the field. The ponding depth was continuously observed by observed staff during the growing season. The ET was measured by 1m diameter PVC lysimeters. Irrigation water volume was measured by 75 mm pipe flow-meters and the drainage water volume by 75 mm pipe flow-meters and a recording Parshall flume. The results showed that irrigation water depths were 688.9 mm, 513.6 mm, and 624.4 mm in 2001, and 356.9 mm, 428.6 mm, and 513.2 mm in 2002 in very shallow, shallow, and deep ponding, respectively. The evapotranspiration were 465.0 mm, 484.1 mm, and 415.1 mm in 2001 and 461.3 mm, 476.3 mm, and 470.6 mm in 2002 in very shallow, shallow, and deep ponding, respectively.
손성호 ( Sohn Seung-ho ),정상옥 ( Chung Sang-ok ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
This study presents an evaluation of the mechanical pipe flowmeter at low hydraulic heads. Three flowmeters each of 75mm and 25mm diameter were used. The Flowmeter was tested with experimental open channel apparatus. Relationship between flowmeter values and bucket values was good. The 75mm diameter flow meter showed small relative errors with hydraulic heads above 9cm. The 25mm diameter flow meter showed small relative errors with hydraulic heads above 2cm. The Irrigation flow measurement using the mechanical pipe flowmeter of 75mm diameter in paddy fields needs hydraulic head above 9cm, which is easy to get in tertiary canals.
손성호 ( Sohn Seung Ho ),박기중 ( Park Ki Jung ),정상옥 ( Chung Sang Ok ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
The purpose of this study is to investigate the effects of ponding depth treatment on water balance in paddy fields. The ponding depth treatments were very shallow, shallow and deep. Daily values of rainfall amount, ponding depth, irrigation water, drainage water, evapotranspiration, and infiltration were measured in the field. The medium ponded plots saved irrigation water about 16% to 53.4% without any statistical difference in rice growth and yields. Hence, the medium ponded depth treatment is better than the traditional deep ponded depth to save water in the transplanted rice culture.
박기중,정상옥,손성호,Park, Ki-Jung,Chung, Sang-Ok,Sohn, Seung-Ho 한국농공학회 2004 한국농공학회논문집 Vol.46 No.4
The purpose of this study was to investigate tile effects of pending depth treatment on water balance in paddy fields. Field experiment was performed in an experimental farm in Taegu, southern part of Korea during the rice growing season In 2001, 2002 and 2003. Experimental plots were three 8m ${\times}$ 80m rectangular plots. Three pending depth treatments, very shallow, shallow, and deep were used. Daily values of water balance components were measured in the field. The irrigation amounts measured at the experimental plots showed that the very shallow and the shallow ponded plots required smaller amount than the deep ponded plot. The shallow ponded plot saved irrigation water about 17.7% compared with the traditional deep ponded plot in 2001 The very shallow ponded plot saved irrigation water about 25.7% compared with the traditional deep ponded Plot in 2002, The shallow ponded plot saved irrigation water about 18% compared with the deep ponded plot in 2003.
박기중 ( Park Ki-jung ),손성호 ( Sohn Seung-ho ),정상옥 ( Chung Sang-ok ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
The purpose of this study was to obtain optimal amount of groundwater development for a rural small watershed. The optimal amount of groundwater development in this experimental watershed is 13.8 %(0.67 x 10<sup>6</sup>m<sup>3</sup>) of the annual rainfall by SCS-CN method. The Visual MODFLOW analyses showed the optimal amount of groundwater development were 14.9 %(0.72 x 10<sup>6</sup> m<sup>3</sup>) of the annual rainfall.