• Spatial Information Research
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• 제10권2호
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• pp.275-287
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• 2002

HEC-HMS와 HEC-GeoHMS를 이용하여 황룡강유역의 유출분석을 수행하였다. 황룡강유역을 HEC-GeoHMS와 GIS를 이용하여 3개의 소유역으로 분할하고 입력자료를 구축하였다. HEC-HMS의 SCS 유출곡선지수 손실계산모형, Snyder 단위유량도 직접유출모형, 지수함수 감수 기저유출모형, Muskingum 추적모형을 사용하여 선택된 홍수사상에 대한 유출량을 모의하였고 매개변수의 최적화를 실시하였다. 최적화된 매개변수를 사용하여 계산한 첨두유량을 관측치와 비교한 결과 매우 양호한 결과를 얻을 수 있었다. 최적화된 매개변수값은 향후 황룡강유역의 유출량을 계산할 때 사용될 수 있을 것이다.

• The Korean Journal of Ecology
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• 제19권5호
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• pp.487-496
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• 1996

This study was conducted to investigate pollutant loading, were quality and plant distribution of 8 streams which are tributaries of the Youngsan River. The nitrate reductase activity (NRA) and nutrient removall capacity of the most frequently occurring aquatic plants on streamside were also determined. As a result, the pollutant loading appeared to be correlated with the area of watershed, while the water quality was related to the land use pattern of each steam. The aquatic plants were distributed differently among the streams; Hydrilla verticillata - Potamogeton crispus, Numphoides peltata - Hydrocharis dubia and Polygonum thunbergii - Phragmites japonica were dominant at the Orye Chon, Jungan Chon, Whangryong River and Jiseok Chon, while potamogeton crispus - Lemma paucicostata, Zizania latifolia - Phragmites communis were dominant at the Youngam Chon and Munpyeong Chon. Persicaria hydropiper and Echinochloa crus-galli var. oryzicola were dominant at Kwangju Chon which was polluted with domestic wastewater. >From the measurement of leaf NRA for dominant species, the highest value of NRA was shown by the Polygonum thunbergii, followed by Oenanthe javanica > Phragmites communis > Zizania latifolia > Lemma paucicostata. The highest nitrogen and phosphorus removal capacity was found in Phragmites communis.

• 한국농공학회논문집
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• 제54권3호
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• pp.103-111
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• 2012

Works for dam heightening plan have dual purposes: flood disaster prevention by securing additional storage volume and river ecosystem conservation by supplying stream maintenance flow. Now, the dam heightening project is in progress and there are 93 dam heightened reservoir. After the dam heightening project, 2.2 hundred million ton of flood control volume in reservoirs will be secured. Thus it is necessary to evaluate the effects of the dam heightening project on watershed hydrology and stream hydraulics, and resulting flood damages. This study was aimed to assess the impact of outflow from the dam heightened reservoir group on the Whangryong river design flood. The HEC-HMS (Hydrologic Engineering Center-Hydrologic Modeling System) model was used for estimating flood discharge, while HEC-5 (Hydrologic Engineering Center-5) was used for reservoir routing. This study analysed flood reduction effect on 100yr and 200yr return periods about the before and after heightening of agricultural dams. Based on the results of this study, the reduction of flood peak discharge at downstream of the reservoir group was estimated to be about 41% and 53% for 100yr and 200yr frequencies, respectively.