• 한국지하수토양환경학회지:지하수토양환경
• /
• 제19권6호
• /
• pp.30-36
• /
• 2014

The objective of this study is to estimate soil loss in the buffer zone of Guem river with future climate change simulation. Revised Universal Soil Loss Equation (RUSLE) model was used for the estimation of soil loss at the buffer zone of Guem river. As results of simulations, the area of the maximum soil loss potential was estimated as the Cheongsung-myeon Okchun-gun Chungcheongbuk-do. The soil losses were estimated to be 106.67 and 103.00 ton/ha/yr for the 2020 segi (2015-2025) and 2040 segi (2035-2045) in the Cheongsung-myeon area, respectively. Also, the estimated average values of soil losses in the Cheongsung-myeon with future climate change was 110.78 ton/ha/yr.

• 한국패류학회지
• /
• 제29권1호
• /
• pp.83-85
• /
• 2013

Size-mass relationships were estimated for 4 species belonging to genus Semisulcospira from the Guem River, Korea. These 4 freshwater snail species: Semisulcospira libertina, Semisulcospira coreana, Semisulcospira gottschei, and Semisulcospira forticosta. Between June and November 2011, samples were caught by dredge (mesh size 10mm of multifilament nylon, total length 4.35 m) at depths of < 2 m. Estimates of for parameter b of the size-mass relationship (W = $aSH^b$) ranged between 2.0072 (Semisulcospira libertina) and 2.3463 (Semisulcospira gottschei).

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2009년도 학술발표회 초록집
• /
• pp.149-153
• /
• 2009

Physics-based distributed rainfall-runoff models are now commonly used in a variety of hydrologic applications such as to estimate flooding, water pollutant transport, sedimentation yield and so on. Moreover, it is not surprising that GIS has become an integral part of hydrologic research since this technology offers abundant information about spatial heterogeneity for both model parameters and input data that control hydrological processes. This study presents the development of a distributed rainfall-runoff prediction system for the Guem river basin ($9,835km^2$) using an Object-oriented Hydrological Modeling System (OHyMoS). We developed three types of element modules: Slope Runoff Module (SRM), Channel Routing Module (CRM), and Dam Reservoir Module (DRM) and then incorporated them systemically into a catchment modeling system under the OHyMoS. The study basin delineated by the 250m DEM (resampled from SRTM90) was divided into 14 midsize catchments and 80 sub-catchments where correspond to the WAMIS digital map. Each sub-catchment was represented by rectangular slope and channel components; water flows among these components were simulated by both SRM and CRM. In addition, outflows of two multi-purpose dams: Yongdam and Daechung dams were calculated by DRM reflecting decision makers' opinions. Therefore, the Guem river basin rainfall-runoff modeling system can provide not only each sub-catchment outflow but also dam inand outflow at one hour (or less) time step such that users can obtain comprehensive hydrological information readily for the effective and efficient flood control during a flood season.

• 한국물환경학회지
• /
• 제23권6호
• /
• pp.822-828
• /
• 2007

Perchlorate is an unregulated contaminant but recently many cases of perchlorate contamination have been reported in the US. In Japan, also, a couple of contamination incidents caused by perchlorate occurred. Against this backdrop, investigation on perchlorate was urgent for Korea. Accordingly, perchlorate investigation in tap water and river water was conducted one time a week for seven consecutive weeks at major water sources of Korea including Han River, Guem River, Yeong-san River, and Nak-dong River. Perchlorate was not found at Han River, Guem River, and Yeong-san River. However, all the 4 tap water samples in Nak-dong River recorded high level of perchlorate. Among others, NT1 located at Daegu posted the highest value of $22.3{\mu}g/L$. This level is lower than $24.5{\mu}g/L$, the threshold recommended by US EPA. Still, perchlorate contamination in drinking water can deal a heavy blow to nerve development of infants and children by causing iodine deficiency. At the 1st and 2nd investigations, perchlorate concentration reached $18.7{\sim}95.6{\mu}g/L$ and $4.0{\sim}25.6{\mu}g/L$ respectively, both of which are relatively higher. The high perchlorate concentration in Nak-dong River was possible because of the waste water discharged from LCD manufacturing factory which was located at NS3 in Gumi, Korea. Perchlorate concentration of waste water from the factory was $730{\sim}1,858{\mu}g/L$.

• 한국환경과학회지
• /
• 제16권4호
• /
• pp.495-503
• /
• 2007

In this study, we took the geometrical character of the river channel junction and hydrologic conditions as independent variables, and hydraulic behavior characteristics as an independent variable. The result, after multiple analysis was carried out, proved that, except for the generating area of the accelerating zone of velocity the accelerating zone and both the main channel and the tributary zone of stagnation the stagnation zone, there was correlation of over 90%. Also, derived presumed expression of the hydraulic characteristics of the junction was applied to the real natural channel - the river channel of the Guem-ho main channel(the A-yang bridge to the Guem-ho bridge). As the result, it proved that it represented hydraulic characteristics relatively well.

• 한국어류학회지
• /
• 제24권1호
• /
• pp.56-61
• /
• 2012

멸종위기 어류 미호종개의 분포양상을 조사하고 대표서식지의 서식개체수를 추정하였다. 과거 (1984~2004)에는 20개 지점에서 출현하였으나 현재 (2006~2011)는 6개 지점에서만 서식이 확인되어 분포지역이 급격히 감소한 것으로 추정된다. 출현지역은 대부분 모래로 이루어진 하천 하류부였으며 서식구간은 매우 협소하였다. 대표서식지인 백곡천과 지천의 서식개체수를 표지-재포획법 등으로 추정한 결과 백곡천은 9,106개체, 지천은 34,717개체가 서식하는 것으로 추정되었다.

• 한국물환경학회지
• /
• 제27권6호
• /
• pp.914-925
• /
• 2011

The variation of streamflow is regarded as one of the most influential factors on the fluctuation of water quality in the stream. The characteristics of the variation should be taken into account in the plans for the management of Total Maximum Daily Loads (TMDLs). This study analysed and characterized spatial distribution and temporal variation of streamflow at each unit watershed in Guem-river basin. For the analysis of the distribution of streamflow, the type and the extent of the distribution were investigated for the unit watershed. For the analysis of the variation, short and long term changes of streamflow were examined. The result showed that most of the distributions were not log-normalized and the extent of variation tends to be greater at the unit watershed placed on the tributaries in the basin. A kind of margin could be granted to the unit watershed involving high variations so as to establish the water quality goal and load allotment more reasonably and effectively in view of whole waterbody.

• 물과 미래
• /
• 제25권3호
• /
• pp.79-86
• /
• 1992

ARF(Areal Reduction Factor) have been developed and used to convert point I-D-F to areal I-D-F in many countries. In Korea, through ARF was calculated in Han river basin by several researchers, it has limit to apply to other regions \ulcorner 새 low density of rainfall gauge station and shortage of data. In this study ARF has developed in areas of high density of rainfall gauge station, Pyungchang river(han river), Wi stream(nakdong river), and Bochung stream(Guem river) basin by fixed-area method. And coefficient of variation of annual mean precipitation was presented to use ARF in othere areas and its applicability was analyzed.

• Korean Journal of Hydrosciences
• /
• 제4권
• /
• pp.105-116
• /
• 1993

Areal Reduction Factor(ARF) has been developed and used to convert point Rainfall intensity-Duration-Frequency(I-D-F) to areal I-D-F in many countries. In Korea, though ARF was estimated in Han river basin by several researchers, it has some limitations to apply to other regions due to low denisity of rainfall gauging station and shortage of data. In this study ARF has been developed in area of relatively high density of rainfall gauging station, i.e., Pyungchang river(Han river), Wi stream(Nakdong river), and Bochung stream(Guem river) basin by geographically fixed-area method. And coefficient of variation of mean annual precipitation was presented to use ARE in other areas and its applicability was analyzed.

• 한국패류학회지
• /
• 제31권4호
• /
• pp.307-314
• /
• 2015

본 조사는 2013년 6월부터 8월까지 금강 상류에서 멸종위기야생생물 I급인 두드럭조개 (Lamprotula coreana)의 서식지를 조사하였다. 서식지 평가를 위하여 하천의 물리적 구조인 여울, 소 및 유수역이 모두 포함된 다양한 서식환경에서 서식상태를 조사하였으며, 하천단면, 수심, 유속, 하상재료 및 서식지 유형 등을 현장에서 측정 하였다. 서식 확인된 두드럭조개는 크기, 무게 및 연령을 기록하고 서식지에 재살포하였고, 서식지적합도지수 (Habitat suitability index, HSI)와 PHABSIM (physical habitat simulation system)에 의한 최적 생태유량 산정을 위하여, 각각의 채집 장소에서 수심, 유속 및 하상재료 등을 기록하였다. 서식지 평가는 수위, 유량 및 하천단면의 현장조사 결과와 두드럭조개의 HSI를 PHABSIM에 적용하여 가용서식지면적 (weighted usable area, WUA)과 유량의 관계 곡선을 작성하였다. 금강 상류에서 채집된 두드럭조개는 각장 $73.1{\pm}18.4mm$ 및 전중 $131.6{\pm}72.3g$ 이었으며, 연령은 2-7년생까지 서식하는 것으로 확인되었다. 두드럭조개의 HSI는 수심 0.4-0.5 m, 유속 0.3-0.5 m/s, 하상재료는 모래-호박돌로 나타났다. PHABSIM에 의해 모의된 최적유량은 2.1 cms였으며, WUA는 $3,730m^2$/1000 m로 나타났다. 두드럭조개의 서식지 평가 결과는 최근 각종 하천 공사 및 생태적 교란 등으로 서식 범위가 감소하고 있는 시점에서 서식지 복원 및 관리를 위한 기초자료로 활용될 수 있을 것이다.