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CN 방법을 이용한 Web 기반의 수문 직접유출모의 System 개발
신용철 ( Yong-chul Shin ),최중대 ( Joong-dae Choi ),임경재 ( Kyoung-jae Lim ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
시험유역의 직접유출량을 추정하기 위해서 Web-based Direct Runoff Estimation System을 개발하였다. Web-based System을 이용하여 I<sub>a</sub> /S 비율이 0.05와 0.20 일때의 직접유출량을 추정하여 실측치와 비교하였으며, 직접유출량에 대한 모형의 검정결과 I <sub>a</sub> /S 비율이 0.20일 때 결정계수(R <sup>2</sup>)는 0.59, 민지수는 0.55로 나타났고, I<sub>a</sub> /S가 0.05 일때의 결정계수(R <sup>2</sup>)는 0.64, EI지수는 0.60 이었다. 따라서 I <sub>a</sub> /S 비율이 0.20 일때보다 I <sub>a</sub> /S 비율이 0.05 일때의 직접 유출량이 더욱 실측값을 잘 반영하는 것으로 나타났다. 본 연구에서 개발된 Web-based System은 유역에서 발생하는 직접유출량을 빠르고 쉽게 산정하는데 이용될 수 있으며, 유출량 산정을 위한 입력변수값을 GIS데이이타에서 추출하여 Web상에서 직접유출량을 모의할 수 있도록 개발된 시스템이다. 따라서 Web-based System을 이용한 장기유출량을 추정하여 시험유역의 토지이용변화가 직접유출에 미치는 영향을 평가 할 수 있으며, 강우에 의해 발생하는 비점오염원의 방지대책을 세우는데 있어서 효율적으로 사용될 수 있다. Excessive direct runoff has caused natural disasters such as flooding and water quality degradation due to nutrients and sediment loadings. A Web-based direct runoff estimation system was developed to estimate long-term direct runoff using historical rainfall, land uses, and soil data. The Web-based System was applied to the Little Eagle Creek (LEC) watershed in Indiana to evaluate accuracy of the model. The Web-based System estimated daily direct runoff values using Ia/S ratios of 0.05 and 0.20 were compared with direct runoff data separated from the U. S. Geological Survey stream flow data. The results showed that the coefficient determination and Nash-Sutcliffe values are 0.64 and 0.60 when Ia/S ratio of 0.05 is used, while 0.59 and 0.55 with Ia/S ratio of 0.20. The comparisons indicate that the use of Ia/S ratio of 0.05, rather than the conventionally used Ia/S ratio of 0.20, may improve the accuracy of direct runoff estimation using the Curve Number method.
원철희 ( Chul Hee Won ),최용훈 ( Yong Hun Choi ),신민환 ( Min Hwan Shin ),신동석 ( Dong Suk Shin ),강동구 ( Dong Gu Kang ),최중대 ( Joong Dae Choi ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.5
We have examined the runoff characteristics of nonpoint source (NPS) in fields. Two monitoring sites were equipped with an automatic velocity meter and water sampler. Monitoring was conducted at fields 1 and field 2 during the rainfall event. Ten rainfall-runoff events were monitored and analyzed during the study period. The results show that runoff occurred if daily rainfall and intensity were higher than 40 mm and 1.6 mm/hr except a few extreme rainfall events with very high intensity. Runoff of field 1 was approximately twice of that of field 2. Event mean concentrations (EMC) and pollution load of analyzed water quality indices were also higher in field 2 than in field 1. Especially, TN load from field 2 was 75.4 mg/m2 and was about 5 times higher than that from field 1. Analysis of Pearson correlation coefficient of water quality parameter indicates that besides of TN all items in fields 1 have tight relationship respectively (p < 0.01). But those of fields 2 have a significant (p < 0.05). Estimating units loading of NPS, we suggested that variable such as soil texture, rainfall amount and intensity and slope were needed to be considered from agricultural landuses. The results of this study can be used as a basic data in the development and implementation of total maximum daily loads (TMDL) in Korea.
최용훈 ( Yong Hun Choi ),원철희 ( Chul Hee Won ),박운지 ( Woon Ji Park ),신민환 ( Min Hwan Shin ),신재영 ( Jea Young Shin ),이수인 ( Su In Lee ),최중대 ( Joong Dae Choi ) 한국물환경학회 ( 구 한국수질보전학회 ) 2012 한국물환경학회지 Vol.28 No.3
In this study, Song-Cheon river Basin located at Dae-kwan-lyong Meyn in Kang-Won Province was monitored to analyze characteristics of non-point source pollution during the snowmelt period. The characteristics of NPS pollution such as runoff, change in water quality and pollutant loads by snowmelt were investigated from 23th February 2010 to 27th April 2010. The results showed that The climate change effects flow, turbidity and concentration of SS and COD with showing similar trend of fluctuation. Daily pollutant loads per unit area were SS 74.43 kg/ha/day, COD 1.25 kg/ha/day, BOD 0.21 kg/ha/day, TN 0.717 kg/ha/day, TP 0.141 kg/ha/day and the flow weight mean concentration has been SS 985.97 mg/L, COD 16.28 mg/L, BOD 2.67 mg/L, TN 9.302 mg/L, TP 1.834 mg/L, respectively. The flow and pollutant loads both of SS and of COD significantly increased during the snowmelt period. Because structurally loosen soil by freezing and thawing deteriorates water quality, research and management measures will be needed.