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저수지 내 침강지의 유형별 수질정화 효율과 퇴적물 특성 변화
장정렬 ( Jang Jeong-ryeol ),최선화 ( Choi Sun-hwa ),남귀숙 ( Nam Gui-sook ),권순국 ( Kwun Soon-kuk ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
본 연구에서는 농업용 저수지 내에 체류지와 유사한 기능을 하는 침강지를 준설형, 차수막형, 보조댐형의 3가지 유형으로 조성하여 COD, T-N, T-P, SS에 대한 수질정화효율과 침강지 조성 전후의 퇴적물의 특성변화를 살펴보았다. 침강지의 정화효율은 수질항목 및 조사시기에 따라 다양한 변화를 나타내었으며 조사항목 평균으로 각각 준설형 18%, 차수막형 11%, 보조댐형 42%순으로 보조댐형이 높게 나타났고 이러한 경향은 우기에는 더욱 높았다. 보조댐형 침강지는 조성 후 퇴적물의 토성변화가 있었고 특히, Silt 성분의 침강효과가 높은 것으로 추정되었다. 현재 1,221개소의 농업용 저수지에 대한 중장기 준설계획이 수립된 바, 준설 시에 유입부를 깊게 준설하고 보조댐을 쌓는 방안을 검토하여 당초 목적한 수자원확보 뿐 만 아니라 저수지 수질관리와 사후 준설작업의 효율성을 증대시킬 수 있는 방안의 검토가 필요하다. 앞으로 침강지 내 퇴적물이 침강지 수질과 정화효율에 미치는 영향을 고려한 합리적인 준설구기에 대한 지속적인 연구가 필요하다. Three types of sedimentation basin(SB), ie., dredging, shield skirt and auxiliary dam, were constructed at the inlets of two irrigation reservoirs and were monitored to evaluate their pollutant removal efficiencies for COD, T-N, T-P, and SS. Removal efficiencies were varied wide ranges from -87.3 to 92.2 % with times and the kind of pollutants. Regression of Concentration(ROC) method was introduced to evaluate the long-term average removal efficiencies. The overall ROC efficiencies of dredging, shield skirt and auxiliary dam were 18%, 11% and 42%, respectively, and those removal efficiencies significantly increased during the rainy season. The auxiliary dam type was more effective than others to trap efficiency. It is recommended that SB, at the inlet of an reservoir, would be constructed as completely separated structure from the water body of reservoir.
장정렬 ( Jeong Ryeol Jang ),최선화 ( Sun Hwa Choi ),권순국 ( Soon Kuk Kwun ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5
A sedimentation basin (SB) at the inlet of an irrigation reservoir which was constructed using an auxiliary dam was monitored to evaluate its pollutant removal efficiency. Water sampling at three points, i.e., inflow stream, upstream and downstream of the reservoir, were taken 5 times before and after the construction of the SB in 1999 and 2003, respectively. No significant water quality variations in inflow stream were observed during these periods. The COD, T-N, T-P and SS removal efficiencies were 38, 24, 35 and 49%, respectively. The results indicated that those removal efficiencies significantly increased during the rainy season and COD removal efficiency, especially, was higher than others studies. The scale of SB in this study was rational as aspects of pollutant removal efficiency and hydraulic detention time. And it is recommended that SB, at inlet of an reservoir, should be constructed as completely separated structure from reservoir water body and having SAR Index from 0.7% to 1.0%.
Newmark type 변위해석에 의한 지진시 필댐의 소성변위 비교
장중렬 ( Jang Jung Ryeol ),장재창 ( Jang Jae Chang ),최경환 ( Choi Kyung Hwan ),정영진 ( Jeong Young Jin ),황인백 ( Hwang In Baek ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
This study compared the result applying two analysis methods based on Newmark Sliding Block theory to calculate permanent displacement that is an estimating factor for seismic safety of Fill Dam. It was analyzed FEM numerical coupled-analysis and Makdisi-Seed method. The permanent displacement for the body of dam during earthquake indicated similar displacements with each of them at the same seismic load.
농촌유역 비점오염원처리를 위한 적정 인공습지 규모결정에 관한 연구
장정렬 ( Jang Jeong Ryeol ),박종민 ( Park Jong Min ),권순국 ( Kwun Soon Kuk ),윤경섭 ( Yoon Kyeong Sup ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
Several studies on development of water quality treatment systems by wetlands are on going because of their benefits of low construction cost and high efficiency of waste water treatment. The objectives of this study were to review the necessary contents of survey and design factors for constructing constructed wetlands and to examine the required wetland area to treat non-point source pollution through case studies. The measurement of water quality and quantity in precipitation period is needed to analyse the inflow characteristics of the non-point pollution and to determine the amount of design flow. The design inflow for constructing constructed wetland was determined to the total runoff from 30mm of daily rainfall in the AMC(III) condition of the SCS method and is similar 70% of the annual mean runoff. The natural type wetland system with 0.1m of water depth and 5 hours of detention time was applied. From the results of the case studies, 70% of inflow could be treated and 1∼3% of wetland area of the total basin is needed.
농업유역 비점원오염 저감을 위한 자유수면형 인공습지 설계인자 평가
장정렬 ( Jang Jeong-ryeol ),권순국 ( Kwun Soon-kuk ),최선화 ( Choi Sun-hwa ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-
The objective of this study is to evaluate design parameters of free water surface constructed wetland for the reduction of agricultural nonpoint source pollution. From literature review, the key design parameters were selected as influent concentration, influent water volume, hydraulic retention time and wetland system arrangement. The design value for each parameter was established after pilot study. Full-scale constructed wetland on the basis of the designed values was constructed to evaluate those reasonableness. The results of this study showed that the designed values for free water surface constructed wetland were appropriate for the reduction of agricultural nonpoint source pollution.