• Journal of Korean Society of Water and Wastewater
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• v.13 no.4
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• pp.62-71
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• 1999

The containment retardation capacities of four different aquifers were evaluated in a preliminary study for development of bank filtration in the Young San river area. $NO_3-N$, $NO_2-N$, $NH_4^+-N$, Fe, Mn, phenol, and chloride were selected as the target contaminants and a nonreactive tracer, respectively. Batch isotherm tests were conducted to measure the partition coefficients of the target contaminants. The mass transport parameters of nonreactive tracer were estimated from column tests. From the results of bath isotherm tests, it was shown that lower stream aquifer materials have greater partition coefficients of $NO_3-N$, $NH_4^+-N$, Mn, and phenol than the upper stream aquifer materials; however, there was no significant position-dependent trend for Fe. All aquifer materials tested have the same range of partition coefficients for $NO_2-N$. Column tests showed that the molecular diffusion of Cl- was much less than the mechanical dispersion; and there was no significant difference between the estimated dispersivities of tested aquifer materials. Consequently, it seems that the difference in the containment retardation capacities between four aquifers tested in this study would primarily result not from hydrodynamic dispersion but from partitioning.

• Journal of Wetlands Research
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• v.14 no.4
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• pp.645-656
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• 2012

The basin environment has been seriously damaged by reckless development during the past half century. The demand for management in the basin has increased, but the system for prediction and management is not sufficient. Therefore, the aim of this study is to design a GIS-based water quality linkage system using the most suitable simulation, HSPF (Hydrological Simulation Program-Fortran) in this basin of South Korea. To achieve this, data of HSPF model for simulation and GIS data for spatial analysis is collected. And the system applied linkages of the water quality model and GIS such as Loose coupling. Also, the major function of the system was designed as a modular unit. Ultimately, the system is developed using development language of VB.NET from Microsoft and ArcObjects component from ESRI based on design for a module unit. The water quality simulation system can be supported to prediction and management for basin environment of Yeong-San River. In the future study, scenario will be established using the result of HSPF model And will be expected to support to situation of future basin and policy making.

• Journal of Environmental Science International
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• v.8 no.6
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• pp.691-697
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• 1999

The work on the eutropication of Youngsan river was conducted from Jul. 1997 to Jun. 1998. The value of water temperature in the study area varied from $4^{\circ}C\;to\;32^{\circ}C$ with an annual mean of $17.5^{\circ}C$. DO varied from 4.0 $mg/{\ell}$ to 13.5 $mg/{\ell}$, with an annual mean 10.2 $mg/{\ell}$,. BOD varied from 0.8 $mg/{\ell}$, to 6.4 $mg/{\ell}$ with an annual mean 3.1 $mg/{\ell}$. COD varied from 4.6 $mg/{\ell}$, to 9.0 $mg/{\ell}$ with an annual mean 6.38 $mg/{\ell}$. Nitrate varied from 1.58 $mg/{\ell}$, to 6.77 $mg/{\ell}$, with an annual mean of 3.475 $mg/{\ell}$, Total-nitrogen varied from 2.14 $mg/{\ell}$ to 8.38 $mg/{\ell}$ with an annual mean of 5.083 $mg/{\ell}$. Total-phosphate varied from 0.035 $mg/{\ell}$ to 0.588 $mg/{\ell}$ with an annual mean of 0.128 $mg/{\ell}$. Chl.a varied from 1.8 ${\mu}g/{\ell}$ to 75.0 ${\mu}g/{\ell}$ with an annual mean of 19.55 ${\mu}g/{\ell}$. The euthrophic state index of $Carlson^{16)}$ were showed 61.8(TP) and 71(SD) value

• Journal of Korean Academy of Rural Health Nursing
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• v.4 no.1
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• pp.22-30
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• 2009

Purpose: The purpose of this study was to explore the prevalence of Clornorchiasis and related factors, targeting inhabitants living in a 5 Km area of the Yeongsan River and to identify knowledge related to Clornorchiasis and intended behavioral changes related to risk of infection. Method: The data were collected from December 16, 2008 to January 10, 2009. A total of 553 questionnaires were distributed, 28 were deleted as answers were not complete, resulting in 525 copies being used for data analysis, which was done using frequency, percentage, $x^2$-test, and t-test with the SPSS 12.0 program. Results: Clornorchiasis was found in 25 persons of the 525 (4.8%). As for knowledge on Clornorchiasis, the Clornorchiasis group had a higher mean score of 10.08 $({\pm}4.96)$, of a possible 17, than the negative group score of 9.42 $({\pm}4.81)$, but, the difference was not statistically significant. The intended behavioral change related to risk of infection, according to presence of infection or not, was statistically significant. Conclusion: Effective management of Clornorchiasis demands management targeted at the inhabitants living in all of the risk areas without any distinction according to sex, areas, live food diet or not, nor liquor consumption or not.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.14 no.5
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• pp.1229-1241
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• 1994

This study aims at investigating the undrained behavior of the normally consolidated clay foundation using single hardening constitutive model based on elasticity and plasticity theories. The specimen employed was sampled at Mooan near the down stream of Young San river and remolded into consolidation apparatus. 11 soil parameters for the model was determined from simple tests such as isotropic compression and consolidation undrained triaxial compression tests. FEM program to predict the undrained behavior of the foundation was developed and back analysis was performed to verify prediction ability of the FEM program. Finally plate load test on the 2-dimensional model foundation was carried out in order to compare numerical analysis and observed values on the foundation.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.334-334
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• 2021

최근 기후변화에 따라 세계적으로 집중호우·태풍·가뭄 등과 같은 기상재해가 증가하고 있으며, 이 중에서도 주기적으로 발생하는 가뭄의 발생빈도 또한 증가하고 있다. 2014년과 2015년 금강수계에 발생한 가뭄과 2017년 낙동강수계에 발생한 가뭄은 갈수로 인한 피해를 야기한 바 있다. 금강수계의 경우 보령댐 저수량 부족으로 제한급수를 시행하였으며, 낙동강수계의 경우 형산강수계의 농업용저수지 고갈로 긴급용수를 공급하기도 하였다. 이에 대하여 낙동강홍수통제소는 2016년부터 수계 내의 갈수상황과 향후 예상되는 갈수전망을 지속적으로 모니터링하고 있다. 수계 전역을 대상으로 강수현황, 다목적댐·용수댐 및 농업용 저수지의 저수현황, 하천의 갈수현황, 향후 기상전망 및 방류계획, 향후 유출전망 등을 1개월 단위(매주) 및 3개월 단위(매월) 작성하며, 갈수예보 및 모니터링지점 선정, 예보적용성 검증 등을 수행하고 2020년부터 갈수예보를 정식으로 시행하고 있다. 본 연구에서는 낙동강수계의 효율적인 갈수예보의 시행과 확대를 위해서 현재 낙동강 본류로 한정되어 있는 갈수관리 지점을 확대하는 방안에 대하여 검토하였다. 기준갈수량이 상대적으로 적은 중권역, 상수도 보급률, 영농여건 물리농지 비율 및 유량관측 안정화 여부를 종합적으로 검토하였으며 확대 지점을 선정하였다.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.6 no.4
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• pp.218-224
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• 2001

Water movement in the Young San River Estuary where a sea dyke was constructed, was observed using anacoustic doppler profiler (ADP) and two TGPS buoys for 25 hours on 27-28 July 2000. Hydrographic observations were simultaneously taken using CTD to understand the characteristic of the spacial structure of temperature and salinity. A large quantity of fresh water was discharged from the sea dyke on 26 July 2000. The observation period fell on neap tide. The amplitude of the tidal elevation and the maximum velocity of the tidal current were about 4 m and 12 cm/sec respectively. The water movement at the surface layer is mainly controlled by wind, and those at the other layers are controlled by semidiurnal tide. The low salinity water less than 22 psu was observed along the northern part during the early observation period while southerly wind prevails. The less saline water moves westward and finally leaves the estuary by easterly wind early on the second day. We can divide the vertical structure into four layers by hydrography and current structure. Mean velocity structure shows that relatively less saline waters at the surface and the middle layer move seaward, and the waters at the upper and the bottom layers move landward. It is thought that the intermittent discharge of river water from the sea dyke makes vertical structure of four layers.

• Journal of Korea Water Resources Association
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• v.51 no.8
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• pp.687-701
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• 2018

A multi-function weir is representative control structure in the stream flow. Estimation of accurate flood discharge according to gate operations and prediction of floodwave travel times at the downstream are very important in terms of water use and river management. This study analyzed the limitation and improvement through the current gate operation data on the Young-san river. in addition, flood discharge was calculated considering lower and upper water level condition and gate operating using the modified slope-area method in the Seoung-chon weir. As a result, the current state was required improvement because exceed the theoretical range and rapidly fluctuation of discharge coefficient, can not be considered difference between the upper and lower water level and the estimation by the regression equation. As a result of applying the proposed method in this study, the above mentioned limitations can be compensated, compared with the current discharge data. Also it was analyzed as more physically valid because using the evaluated hydraulic equation and estimate the slope and friction loss of natural stream by iteration and to reduce the error. In conclusion, the process carried out serves as a representative flow control point of the water system through reliable discharge estimation, it is expected that it will be possible to properly river management.

• Journal of the Korean Society of Marine Environment & Safety
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• v.14 no.4
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• pp.267-273
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• 2008

The purpose of this study is to investigate the distributive property of organic pollutants in effluents of argo/industrial wastewater treatment plants in Jeonnam using simultaneous analysis method of 310 chemicals. The numerous organic pollutants were detected in four sampling sites and the major chemicals were pesticides, CH type chemicals such as polycyclic compounds, CHO type chemicals such as phthalates, and CHO(N) type chemical such as aromatic amines. Moreover, 17 kinds of endocrine disrupters which include diethylptbalate were detected in each sampling sites. TU (Toxic unit) indicated cytotoxicity of samples using XTT assay, it appeared highly at A point(27.2) and D point(24.4). Also, the results from the correlation between total concentration of pollutants and TU did not correspond to the results of chemical and biological analysis.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.3 no.2
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• pp.45-59
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• 1983

This study aims at investigating the deformation and strength characteristics on reconsolidated-remoleded saturated clay sampled at the downstream of Young-san river, in Cheollanamdo through a series of both drained and underained triaxial tests by means of the critical state concept. Among several constitutive equations developed so far, the Cam-clay model, the modified Cam-clay model and the dilatancy model are used. The prediction of strains is obtained and the value of prediction is compared with that of observation. For the clay specimen, the prediction of volumetric strain on the dilatancy model is well consistent with the observation and the prediction of shear strain on the modified Cam-clay model coincides exactly with the observation.