• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.416-416
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• 2012

최근 엄청난 폭우로 인해 발생한 하천의 범람으로 수많은 인명피해가 발생하였는데, 이를 위해 정부에서는 하천 정비를 포함한 치수 및 방재 정책을 꾸준히 펼치고 있다. 하지만, 지구온난화 등으로 인한 기후변화로 발생하는 자연재해는 예측치를 넘는 집중 호우로 인해 큰 효과를 보지 못하고 있는 실정이다. 이에 따라 홍수범람을 정확히 예측하기 위한 수치 모형에 대한 연구가 활발히 이루어져 왔으나 예측 모의결과가 수치적 자료 또는 도면으로 제시되어 재해관리자가 방대한 모의자료를 신속하게 검토하여 방재대책을 수립하는 데 어려움이 있다. 이와 같은 문제점을 개선하여 효과적으로 홍수 및 범람 예측결과를 제공하기 위해서는 모형결과를 가시화하기 위한 연구가 필요하며, 강우에 따른 2차원 수치해석을 이용하여 흐름의 변화 및 유량을 파악하고 2차적인 피해를 예방하고 원인을 규명하기 위해 최근 범람을 했던 지역의 자료를 이용하여 흐름의 특성을 파악함으로써 그러한 현상을 미연에 방지할 수 있다. 본 연구에서는 2011년 7월에 발생한 경기도 광주시 곤지암천 범람을 HEC-RAS 및 CCHE2D 모형을 이용하여 시간별로 제방 붕괴 시점 및 그에 따른 범람 해석을 모의하여 분석하였다. 이를 통해 당시 발생한 하천범람 현상을 예측하고 이를 예방하기 위한 대책을 제시하고자 한다.

• Water for future
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• v.44 no.9
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• pp.76-88
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• 2011

• Journal of Korea Water Resources Association
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• v.37 no.2
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• pp.155-161
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• 2004

The purpose of this study is to verify LSPIV technique. Verification was made using moving cart with known velocity. The difference of velocity values obtained using these methods are within 5％, which means that LSPIV can be used in the field with reasonable accuracy After verification, LSPIV was applied to the river. The Neungwon stream and the Gonjiam stream, tributaries of the Kyungan stream, were selected as the test sites for application. The results of the test application were compared with those obtained by 3-D electromagnetic current meter and electron-wave surface velocity meter. Results show that the velocity values obtained using LSPIV coincide well with those obtained using conventional devices with maximum difference of 8％.

• Journal of The Korean Society of Agricultural Engineers
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• v.54 no.2
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• pp.87-94
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• 2012

This study is to evaluate flood inundation and to recommend measures of damage reduction on sediment by concentrated torrential rainfall at Gonjiamcheon Watershed (183.4 $km^2$). Firstly, the SWAT (Soil and Water Assessment Tool) was simulated streamflow and sediment at upstream. Then, we produced a map of floodplain boundary by using HEC-RAS (Hydrologic Engineering Centers River Analysis System) at downstream. The SWAT model was calibrated with 2 years (2008~2009) daily streamflow and validated for another years (2010~2011. 7. 31). The SWAT model was simulated with 3 years (2008~2010) by monthly water quality (Sediment) at Gonjiamcheon water quality station. The streamflow and sediment from SWAT model were input as boundary conditions to HEC-RAS. The results of HEC-RAS indicated that mapping of floodplain boundary was Jiwol and Jiwol 2 district. Additionally, inundation area and depth were assessed and applied BMPs scenario for managing the sediment yield.

• Korean Journal of Environmental Agriculture
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• v.17 no.2
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• pp.136-139
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• 1998

The water quality in Kyoungan stream was surveyed at 6 sites for 7 months from March to September in 1994, 1995 and 1997. The overall results are summarized as follows: Yearly COD concentration of Kyuongan stream was decreased from 26.3 mg/l in 1994 to 17.8 mg/l in 1997, but those of $NH_4-N$ and $NO_3-N$ were not changed. The water quality of Kyoungan stream in July and August was better than any other months due to dilution with rainwater. The water quality along Kyoungan stream was deteriorated with inflow of tributaries contaminated with livestock wastewater and sewage water in the mid-stream, but thereafter it was recovered with inflow of Gonjiam steam and Beon stream.

• Journal of Korea Water Resources Association
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• v.54 no.11
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• pp.891-901
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• 2021

In this study, a hydrological cycle soundness evaluation method was developed using monthly meteorological observation data. The Gyeongan stream watershed was divided into five sub-basins and eight criteria were established for hydrological cycle evaluation: the number of non-rainfall day, the number of non-rainfall day fluctuation, over 30 mm per day, over 30 mm per day fluctuation, average river level, average river level fluctuation, average groundwater level and average groundwater level fluctuation. Observation data were normalized and weights for evaluation by each sub-basin were calculated using the entropy method. The hydrological cycle soundness evaluation indices were calculated using TOPSIS applying the calculated weight value. As a result of the study, it was found that the hydrological cycle soundness was unstable in the Gyeongan-upstream from November to January, the Gyeongan-suwipyo from February to April, Gonjiam stream from April to May, and the Gyeongan-downstream from November to February. In this study, the developed technique is expected to serve as a quantitative basis for policy decision to recover hydrological cycle soundness.

• Parasites, Hosts and Diseases
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• v.34 no.2
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• pp.95-106
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• 1996

The infestation rates and abundances of human infecting metacercariae (Clonorchis sinensis, Metcgonimus spry. , Centrocestus crmatus, Echinostoma hortense, Echinochusnus japonicw, Clinostomum complanctum) in freshwater fish were investigated at the three river areas - Taewhagang (river), Hyongsangang (river), Nakdonggang (river) - in Kyongsang-do and at four streams - Yonpungchon, Munsanchon, Kyonganchon, and Konjiamchon- in Kyonggi-do, Korea in 1994-1995. The fish caught at Taewhagang were heavily infested with metacercariae of Clonorchis sinensis and Centrocestw armctus. At Hyongsangang, Zncco platypus and Z. temmincki were moderately infested with metacercariae of C. crmctus. Chomanpo, at the basin of Nakdonggang, was still endemic for C. sinensis. In the fish caught at four streams of Kyonggi-do, metacercariae of C. sinensis exhibited the highest infestation rate and intensity out of 6 species of metacercariae. The infestation intensity of C. sinensis metacercariae in fish flesh was markedly different according to each division of flesh. The cause of this difference was conjectured as a result of larval behavior. The metacercariae of C. omnt5 were found in almost all parts, except scales and fins, of fish. The infestation rates and intensities of C. sinensis and C. armntus metacercariae in Taewhagang greatly increased as compared with those of previous reports . RhinoBobius bmnneus and Aconthorhone5 macropterus are newly recorded intermediate hosts of Echinostonn hortense. The reason of large differences from previous data was discussed and the standard method of metacercaria examination was proposed.