물수지분석 기법에 의한 논에서의 회귀율 조사분석

Return flow analysis of paddy field by water balance method

  • 발행 : 2001.03.01

초록

A water balance analysis was performed for a paddy field neighboring the Dongchang stream, downstream of the Unmun reservoir, which is constructed for the urban water supply. Daily rainfall data were collected and irrigation water flow rate, drainage flow rate, evaportranspiration, infiltration, and piezometeric head were measured in the field. The flow rates were continuously observed by water level logger during the growing season. The evaportranspiration and the infiltration were measured by N-type depletion meter and cylindrical infiltrometer, respectively. PVC pipes with 12mm diameter were used for piezometric head measurement. Total Irrigation and drainage flows were 3,608mm and 1,170mm in 1999, and 3,971mm and 1,548mm in 2000, respectively. The mean and range of the daily infiltration rate were 4.4mm/d and 3.4mm/d to 5.5mm/d in 1999 and 5.1mm/d and 4.1mm/d to 6.5mm/d in 2000, respectively. The net ground water flow including the change of soil water storage was 2,855mm in 1999 and 2,540mm in 2000. The evapotranspiration was 458.3mm in 1999 and 553.5mm in 2000. The range of daily evapotranspiration rate was from 1.6 to 8.7mm/d. The return flow ratio was about 32% in 1999 and 39% in 2000 and three year average was 35% including previous study in 1997. The amount of irrigation water was much higher than design standards or references in this study, This was caused by the inadequate water management practice in the area where water was oversupplied on farmers’ request rather than following sound water management principles.

키워드

참고문헌

  1. 농공기술 농업용수 수요량의 새로운 추정기법 김현영
  2. 박사학위논문, 경상대학교 답지대의 물수지와 용수의 반복 이용에 관한 연구 안세영
  3. 한국수자원학회논문집 v.30 no.4 논의 유출곡선번호 추정 임상준;박승우
  4. 한국농공학회 학술발표회 논문집 양수장 용수공급 논 지대의 물수지 정운태;이근후;이인영
  5. 낙동강유역 농업용수 희귀율 조사 한국건설기술연구원
  6. Journal of the KSAE v.40 A Study on the Return Flow of Irrigation Water in Paddy Fields Chung, Sang Ok
  7. Water Balance Analyses of an Irrigated Paddy Field, Asian Regional Workshop on Sustainable Development of Irrigation and Drainage for Rice Paddy fields Chung, Sang Ok
  8. REF-ET: Reference evapotranspiration calculation software Utah State University