[논문]수문상황을 고려한 하천에서의 농업용수 사용량추정 연구

곽재원

doi:10.3741/jkwra.2021.54.5.311

수문상황을 고려한 하천에서의 농업용수 사용량추정 연구
A study on estimation of agricultural water usage in river consider hydrological condition 원문보기

Journal of Korea Water Resources Association = 한국수자원학회논문집, v.54 no.5, 2021년, pp.311 - 320

곽재원 (환경부 한강홍수통제소)

초록
AI-Helper

농업용수는 우리나라의 용수사용량 중에 61%를 차지하고 있으며, 효율적인 수자원관리를 달성하기 위한 핵심적인 관리목표 중 하나이다. 본 연구에서는 댐과 저수지 등을 관리하는 실무자가 수문상황에 따른 하천에서의 농업용수 임계사용량을 간편하게 추정하기 위한 방법론을 제안하고자 하였다. 이를 위하여, 4대강 권역의 주요 27개 하천유역을 대상으로 하여 유역의 유출량과 하천수 사용실적을 수집하였다. 하천에서의 농업용수 사용과 예년대비 유출율이 유의미한 상관관계가 있음을 나타내었으며, 분위회귀를 이용하여 농업용수 최대사용을 대표하는 임계곡선으로 제시하고 27개 하천유역에 적용하였다. 최종적으로 예년대비 2개월 유출율에 따른 농업용수 최대사용량대비 사용률로 표현되는 두 가지 임계곡선과 식을 제시하였다. 또한, 유역특성을 비교하여 삼림면적 대비 농지면적의 비를 기준으로 임계곡선 유형을 결정할 수 있도록 하였으나, 추가적인 자료 수집과 분석이 필요할 것으로 판단된다. 본 연구에서 제시한 방법은 하천 농업용수 임계사용량을 간편하게 추정하고 활용할 수 있으므로 수자원관리 실무에서 유용하게 활용될 수 있을 것으로 기대한다.

Abstract ▼ AI-Helper

The agricultural water, which occupy about 61% of total water usage in the South Korea, is significantly objective to archieve effecitive water resources management. The objective of the study is to suggest a simple method in actual practice that could be used to estimate agricultural water usage in river considering hydrological condition. Historical record of agricultural water usage and runoff, which take account for hydrological condition of the basin, were obtained for totally 27 river basins. As the result, the high threshold value of the agricultural water usage rates compared to maximum usage amount has a particular correlations to the percent of normal year runoff for last 2 month, and threshold line of agricultural water usage rates was derived using the quantile regressions. Finally, two dimensionless threshold line and empirical formulas that described the correlation between the percent of normal year runoff for last 2 month and the agricultural water usage rate compared to maximum usage amount were derived. Also, the simple criteria to select which line and formula based on the characteristics of the basins was suggested but it need further studies. The result of the study could be used as an elemantary data in actual practice for water resoureces management.

주제어

표/그림 (9)

그림 Fig. 1. Study area and basin
표 Table 1. Selected basin and its hydrological (hydrl.) station
그림 Fig. 2. Obtained record of Imjin river; (a) time-series of data; (b) scatter plot of flow rate compared to normal year and water usage rate compared to maximum usage amount
그림 Fig. 3. Scatter diagram for the percent of normal year for last several months versus water usage rate compared to permission amount in the Imjin River; (a) 1-month; (b) 2-month; (c) 3-month; (d) 6-month; (e) 9-month; (f) 12-month
그림 Fig. 4. Scatter diagram of the percent of normal year runoff and the water usage rate compared to maximum usage amount in the Imjin River; red point indicated that it has 0.95 or more value in CDF, and red dot line is threshold line of agricultural water usage
그림 Fig. 5. Threshold line of each study basins; (a) 27 threshold lines for all basins; (b) 17 threshold lines with concave trend; (c) 10 threshold with convex trend; grey line indicated each threshold line and red dot line indicated median of each lines; and blue dot-dashed line treated as abnormal trend
그림 Fig. 6. The boxplot of the ratio of agricultural area compared to forest area for each trend
그림 Fig. 7. Threshold line for each trend basin; (a) concave trend and (b) convex trend and its dimensionless equation, and red point indicate median value of each threshold line, grey band indicated the band of first quartile to third quartile (Q₁ ~ Q₃), dotted line indicated max～min range
표 Table 2. Agricultural WUM equation for each trend

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표제어: PCR

동의어: Packet Collision Rate

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용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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