• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.4
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• pp.135-144
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• 2010

Many plans of ecologic streams are developed and performed in several regions. In spite of obtaining of instream water is most important problem to composite an ecologic stream, assessment methods for instream water are too various to estimate an optimal result. This study shows practical assessment method which add regional needs such as stream view and necessary water quality level to the traditional method considering water shortage, water quality, ecologic system and necessary flows. It also shows a feasibility of instream water obtaining project in Daejeon city.

• Journal of Korean Society on Water Environment
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• v.24 no.3
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• pp.345-353
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• 2008

In order to design storage-based non-point source management facilities, the aspect of statistical features of the entire precipitation time series should be considered since non-point source pollutions are delivered by continuous rainfall runoffs. The 3-parameter mixed exponential probability density function instead of traditional single-parameter exponential probability density function is applied to represent the probabilistic features of long-term precipitation time series and model urban stormwater runoff. Finally, probability density functions of water quality control basin overflow are derived under two extreme intial conditions. The 31-year continuous precipitation time series recorded in Busan are analyzed to show that the 3-parameter mixed exponential probability density function gives better resolution.

• Journal of Korean Society of Water and Wastewater
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• v.23 no.5
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• pp.565-572
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• 2009

Hydraulic modeling is widely used to simulate wastewater flow. The simulated models are used to prevent flood and many other problems associated with wastewater flow in planning or rehabilitating sewer systems. In this study, MAKESW (An engineer, South Korea), MOUSE (DHI, Denmark), and SWMM (XPSoftware, USA) are used to for hydraulic modeling of wastewater in C-city, South Korea and E-city, Iraq. These modeling tools produced different results. SWMM comparably overpredicted runoff and peak flow. In using SWMM, use of accurate data with a high confidential level, detail examination over the target basin surface, and the careful selection of a runoff model, which describes Korea's unique hydraulic characteristics are recommended. Modification of existing models through the optimization of variables cannot be achieved at this moment. Setting up an integrated modeling environment is considered to be essential to utilize modeling and further apply the results for various projects. Standardization of GIS database, the criteria for and the scope of model application, and database management systems need to be prepared to expand modeling application.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1383-1387
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• 2008

우리나라는 계절적으로 편중된 강우특성 때문에 이수관리와 치수관리가 분리될 수 없고, 하천유역 상 하류의 수량과 수질은 유기적으로 연관되어 있으므로 수자원관리는 하천유역단위로 통합적으로 이루어져야 한다. 특히 한정된 수자원으로 하천의 수량과 수질 목표를 동시에 달성하기 위해서는 물의 수요와 공급을 실시간 정보로 획득하면서 기상과 유출 분석기술을 활용하여 운영기간 동안의 용수수요와 공급을 예측하고, 이를 바탕으로 하천과 저수지의 수량과 수질을 고려한 유역 저수지군 시스템의 최적 물공급계획을 수립 시행할 수 있도록 지원하는 통합 물관리 Toolkit과 운영 기술이 필요하다. '유역통합 물관리시스템(IRWMS)'은 유역의 유출량 산정과 예측을 담당하는 유역유출 예측시스템(RRFS)과 연동하여 장 단기 저수지군 시스템의 최적운영 의사결정을 지원하기 위한 월단위 최적운영모형(SSDP), 일단위 최적운영모형(CoMOM), 그리고 유역물배분 모의운영모형(KModSim)이 포함되어 있다. RRFS로부터 예측된 수계내 소유역별 유입량 및 수요량(농업, 공업, 생활용수) 정보를 토대로, SSDP 또는 SSDP-CoMOM 연계모형으로부터 구한 월 또는 일 단위 최적저류량 및 방류량을 산정, 이를 KModSim 모형에 입력하여 장 단기 모의를 통하여 유역 물관리 의사결정의 최종단계에 해당하는 저수지군 최적방류량 결정에 필요한 정보 및 시나리오를 제공하게 된다. 본 연구에서는 개발된 저수지운영 요소모형들을 이용하여 금강수계 저수지군의 연계운영에 적용하였다.

• The Korean Journal of Ecology
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• v.18 no.3
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• pp.341-351
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• 1995

The relationship between land uses and water quality was investigated at Kyong-an Stream. Some 70% of this watershed was forested area, half of which was comprised of Pinus densilflora community. Concentrations of $NH_4^{+},\;NO_3^{-},\;NO_2^{-}, total nitrogen, $Cl^{-},\;PO_4^{3-}$, DO, and BOD increased gradually from upstream to downstream, whereas heavy metals did not have such tendancy with the exception of a few sites. Urban area was significantly correlated with hardness and chloride concentration. Relationship among phosphate concentration(P), cultivated field area(F), and stream length(S) in each basin was P = 1.7912 F/S＋0.0103. the concentration of $NH_4^{＋}$ was positively correlated with the population size and cow density within the catchment. The effect of urban area(U) and stream length of the pH(pH) was represented by pH = -4.7344 U/S＋6.52. It can be concluded that the control of nonpoint source pollution as well as point source pollution is one of the important problems of water quality management, especially geological properties must be considered for sustainable development.

• Journal of Environmental Science International
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• v.26 no.3
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• pp.401-410
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• 2017

This study analyzed the changes in the concentrations of organic matters in constructed treatment wetlands, coming from discharge water from a sewage treatment plant and non-point pollutant sources during rainfall events. At the beginning of a rainfall event, a massive amount of particulate organic matter flowed in, and was removed from the sedimentation basin (S1, S2); dissolved organic matter was removed after passing through stepwise treatment processes in the wetland. During dry period in the wetland, the removal efficiency rate for COD and TOC was -21 and -7%, respectively; during the rainfall event, the removal efficiency rate for COD and TOC were 47 and 43%, respectively. The highly-concentrated organic matters that flowd in at the beginning of the rainfall event was stabilized by various structures in the wetland before water discharge. Cyanobacteria blooms annually at the confluence of the So-ok stream and Daecheong Lake. Therefore, it is expected that the wetland will contribute significantly to reducing cyanobacteria and improving water quality in the area.

• Journal of Agricultural Extension & Community Development
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• v.22 no.1
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• pp.69-78
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• 2015

This study conducted IPA of each item related to the farm party operation aiming at the participants to farm parties. The survey was carried out on the participants to the farm parties held in Damyang County from October 11th to November 22nd, 2014, and 103 questionnaires were used for the final analysis. The specific results of the IPA are as follows. In the first quarter of 'maintenance and management performance' are included the total of seven items. They are a harmonious view with the surrounding environment, friendliness of the farmer and the party staff, posting the event schedule and providing the program, proper disposition of the staff in the farm, an exchange among farm party participants, food that makes use of farm produce and the convenience of gaining information. In the second quarter of 'intensive improvement' are included eight items. They are cleanliness of the facilities such as restroom and basin, providing the pamphlets or promotion materials of the farms in the farm party, things to experience utilizing the farm produce grown in the host farm, various events, smooth progress of the farm party program, inclusion of the indigenous native food, variety of things to buy including farm produce and information delivery about the farm produce on sale.

• Journal of Industrial Technology
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• v.19
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• pp.155-162
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• 1999

In the last few years the automatic classification of morpholgical landforms using GSIS and DEM was investigated. Particular emphasis has been put on the morphological point attribute approaches and the extraction of drainage basin variables from digital elevation models. The automated derivation of landforms has become a neccessity for quantitative analysis in geomorphology. Furthermore, the application of GSIS technologies has become an important tool for data management and numerical data analysis for purpose of geomorphological mapping. A process developed by Dikau et al, which automates Hanmond's manual process, was applied to the pyoung chang of the kangwon. Although it produced a classification that has good resemblance to the landforms in the area, it had some problems. For example, it produced a progressive zonation when landform changes from plains to mountains, it does not distinguish open valleys from a plains mountain interface, and it was affected by micro relief. Although automating existing quantitative manual processes is an important step in the evolution automation, definition may need to be calibrated since the attributes are oftem measured differently. A new process is presented that partly solves these problems.

• Journal of Environmental Health Sciences
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• v.28 no.2
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• pp.61-69
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• 2002

Oship stream is located nearby south eastern coasts. This study was performed to find out waters quality modeling and then to predict water quality of Oship stream. Based on survey data, BOD, T-N, T-P calibration and verification result were in good agreement with measured value within mean coefficient variance(MSE) value, which were 13.9%, 9.0%, 26.5% and 19.5%, 12.0%, 16.5%, respectively. Sectional water quality predictions of the main stream of Oship stream are executed on the basis of the following cases 1) with sewage treatment of Dogye-eup 2) reduction of mine wastewater treatment of 80% in th basin. As a result, BOD, T-P improvement rates at down stream of Oship stream, case 1) were appeared 12.2%, 22.2%, case 2) maximum sulfate ion and conductivity reduction removal rate of Oship stream were 58%, 68%. The main pollution sources of Oship-stream were almost domestic wastewater and mine wastewater discharged from Dogye-eup which located in uppers stream. The large effects will appear after the construction of Dogye sewage water treatment plant which remove the organic matter and nutrients in these sewage water. The waste water from mine can not easily to treat for characteristics of effluence and economic problems. However, to achieve the goal of water quality in Oship-stream water system, treatments of those are necessary.

• Geomechanics and Engineering
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• v.20 no.6
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• pp.547-556
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• 2020

An understanding of the influence of MR (Magmatic Rock) thickness on the surrounding rock behaviors is essential for the prevention and management of dynamic disasters in coal mining. In this study, we used FLC3D to study the breaking and instability laws of surrounding rock with different MR thicknesses in terms of strata movement, stress and energy. The mechanism of dynamic disasters was revealed. The results show that the thicker the MR is, (1) the smaller the subsidence of the overlying strata is, but the subsidence span of the overlying strata become wider, and the corresponding displacement deformation value of the basin edge become smaller. (2) the slower the growth rate of abutment pressure in front of the working face is, but the peak value is smaller, and the influence range is larger. The peak value decreases rapidly after the breaking, and the stress concentration coefficient is maintained at about 1.31. (3) the slower the peak energy in front of coal wall, but the range of energy concentration increases (isoline "O" type energy circle). Finally, a case study was conducted to verify the disaster-causing mechanism. We anticipate that the research findings presented herein can assist in the control of dynamic hazards.