Numerical Study on Filtration of Microparticle from Non-point Source

Seongjoon Byeon,Bonjin Koo,Jintak Choi,WooSung Cho 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.11

The impermeable area and the peak discharge volume have been consistently increasing due to widening of city development and renewal. Thus, distortion of water cycle has been serious problem compared to the past. When it comes to NPS pollution, lack of information on the load and characteristics of pollutants led to the insufficient reduction measures. Because the particles with size over 100 in road runoffs can go through gravitational sedimentation, they are controllable in grit chamber according to the structure of NPS pollution reduction facilities. In this section, using CFD model, the behavior of fluid and particle distribution according to structure characteristics of reduction facilities will be simulated and the optical condition for successful treatment in grit chamber will be calculated. As a result of study, numerical analysis about treatment of particulate pollutants with size greater than 100 for which gravitational sedimentation is possible showed that by controlling the inflow velocity the sedimentation efficiency could be improved and it is determined that maintenance will become facilitated through the installment of facilities such as baffles at grit chamber.

미래 기후에 따른 유량변화를 고려한 생태유량 평가: SWAT-PHABSIM을 이용하여

변상돈 ( Sangdon Byeon ),사디키사예드샤자한 ( Sayed Shah Jan Sadiqi ),이종진 ( Jongjin Lee ),김성준 ( Seongjoon Kim ),홍은미 ( Eunmi Hong ) 한국농공학회 2021 한국농공학회 학술대회초록집 Vol.2021 No.-

PHABSIM을 활용한 환경생태유량 산정 기초연구

변상돈 ( Sangdon Byeon ),김성준 ( Seongjoon Kim ),허준욱 ( Junwook Hur ),홍은미 ( Eunmi Hong ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-

기후변화로 인한 하천의 수질 및 유량의 변화는 서식하는 동식물의 서식환경을 변화시켜 수생태계 건강성에 큰 위협을 주고 있다. 이에 정부는 수생태계 건강성을 유지할 수 있도록 하기 위하여 2017년 ‘수질 및 수생태계 보전에 관한 법률’을 개정하여 ‘물환경보전법’을 공포하였으며, 기존에 생활·농업·공업·발전 등의 하천수 사용만을 고려한 ‘하천유지유량’을 인간의 하천수 사용뿐만 아니라 생태계에 서식하는 어류 등의 서식처로서의 기능을 확보하기 위한 ‘환경생태유량’의 개념을 도입하였다. 하천에 서식하는 대표적 생물인 어류에게는 생존과 번식을 위한 조건의 서식처 환경이 존재하며, 이에 따른 최적유량을 산정하는 방법으로는 미국에서 개발된 물리적 서식처 모의시스템인 PHABSIM(Physical Habitat Simulation System)을 이용한다. PHABSIM은 유량증분방법론(Instream Flow Incremental Methodology, IFIM)에 입각한 모의 시스템이며, 서식처적합도 지수(Habitat Suitability Index, HSI)와 하천의 구조 및 흐름특성 등을 통하여 가용서식처면적(Weighted Useable Area, WUA)-유량관계 곡선을 산출한다. 이를 통하여 물리서식처에 따른 환경생태유량을 산정할 수 있게되며, 또한 모의과정을 통하여 유량 변화에 따라 어류의 서식처 범위를 파악할 수 있게 된다. 본 연구의 결과를 기초로하여 유역환경변화에 따라 서식하고 있는 어류의 가용서식처면적을 추정할 수 있으며, 이에 따라 생존하기 위한 최적의 환경생태유량을 산정할 수 있게 될 것이다.

Wastewater Treatment Plant Control Strategies

Ballhysa, Nobel,Kim, Soyeon,Byeon, Seongjoon The Institute of Internet 2020 International journal of advanced smart convergenc Vol.9 No.4

The operation of a wastewater treatment plant (WWTP) is a complex task which requires to consider several aspects: adapting to always changing influent composition and volume, ensuring treated effluents quality complies with local regulations, ensuring dissolved oxygen levels in biological reaction tanks are sufficient to avoid anoxic conditions etc. all of it while minimizing usage of chemicals and power consumption. The traditional way of managing WWTPs consists in having employees on the field measure various parameters and make decisions based on their judgment and experience which holds various concerns such as the low frequency of data, errors in measurement and difficulty to analyze historical data to propose optimal solutions. In the case of activated sludge WWTPs, parts of the treatment process can be automated and controlled in order to satisfy various control objectives. The models developed by the International Water Association (IWA) have been extensively used worldwide in order to design and assess the performance of various control strategies. In this work, we propose to review most recent WWTP automation initiatives around the world and identify most currently used control parameters and control architectures. We then suggest a framework to select WWTP model, control parameters and control scheme in order to develop and benchmark control strategies for WWTP automation.

Information and Communication Technologies for Smart Water Grid Applications

Ballhysa, Nobel,Choi, Gyewoon,Byeon, Seongjoon The Institute of Internet 2019 International journal of advanced smart convergenc Vol.8 No.2

The use of Information and Communication Technologies (ICT) is the key to operate a change from the traditional manual reading of water meters and sensors to an automated system where high frequency data is remotely collected and analyzed in real time, one of the main components of a Smart Water Grid. The recent boom of ICT offers a wide range of both wired and wireless technologies to achieve this objective. We review and present in this article the most widely recognized technologies and protocols along with their respective advantages, drawbacks and applicability range which can be Home Area Network (HAN), Building Area Network (BAN) or Local/Neighborhood Area Network (LAN/NAN). We also present our findings and we give recommendations on the application of ICT in Smart Water Grids and future work needed.

Wastewater Treatment Plant Control Strategies

Nobel Ballhysa,Soyeon Kim,Seongjoon Byeon 한국인터넷방송통신학회 2020 Journal of Advanced Smart Convergence Vol.9 No.4

The operation of a wastewater treatment plant (WWTP) is a complex task which requires to consider several aspects: adapting to always changing influent composition and volume, ensuring treated effluents quality complies with local regulations, ensuring dissolved oxygen levels in biological reaction tanks are sufficient to avoid anoxic conditions etc. all of it while minimizing usage of chemicals and power consumption. The traditional way of managing WWTPs consists in having employees on the field measure various parameters and make decisions based on their judgment and experience which holds various concerns such as the low frequency of data, errors in measurement and difficulty to analyze historical data to propose optimal solutions. In the case of activated sludge WWTPs, parts of the treatment process can be automated and controlled in order to satisfy various control objectives. The models developed by the International Water Association (IWA) have been extensively used worldwide in order to design and assess the performance of various control strategies. In this work, we propose to review most recent WWTP automation initiatives around the world and identify most currently used control parameters and control architectures. We then suggest a framework to select WWTP model, control parameters and control scheme in order to develop and benchmark control strategies for WWTP automation.

PHABSIM과 SWAT을 이용한 연계모델링 적용성 평가

김용원,변상돈,박진석,우소영,김성준,Kim, Yongwon,Byeon, Sangdon,Park, Jinseok,Woo, Soyoung,Kim, Seongjoon 한국수자원학회 2021 한국수자원학회논문집 Vol.54 No.10

This study is to evaluate applicability of linkage modeling using PHABSIM (Physical Habitat Simulation System) and SWAT (Soil and Water Assessment Tool) and to estimate ecological flow for target fishes of Andong downstream (4,565.7 km²). The SWAT was established considering 2 multi purpose dam (ADD, IHD) and 1 streamflow gauging station (GD). The SWAT was calibrated and validated with 9 years (2012 ~ 2020) data of 1 stream (GD) and 2 multi-purpose dam (ADD, IHD). For streamflow and dam inflows (GD, ADD and IHD), R², NSE and RMSE were 0.52 ~ 0.74, 0.48 ~ 0.71, and 0.92 ~ 2.51 mm/day respectively. As a result of flow duration analysis for 9 years (2012 ~ 2020) using calibrated streamflow, the average Q185 and Q275 were 36.5 m³/sec (-1.4%) and 23.8 m³/sec (0%) respectively compared with the observed flow duration and were applied to flow boundary condition of PHABSIM. The target stream was selected as the 410 m section where GD is located, and stream cross-section and hydraulic factors were constructed based on Nakdong River Basic Plan Report and HEC-RAS. The dominant species of the target stream was Zacco platypus and the sub-dominant species was Puntungia herzi Herzenstein, and the HSI (Habitat Suitability Index) of target species was collected through references research. As the result of PHABSIM water level and velocity simulation, error of Q185 and Q275 were analyzed -0.12 m, +0.00 m and +0.06 m/s, +0.09 m/s respectively. The average WUA (Weighted Usable Area) and ecological flow of Zacco platypus and Puntungia herzi Herzenstein were evaluated 76,817.0 m²/1000m, 20.0 m³/sec and 46,628.6 m²/1000m, 9.0 m³/sec. This results indicated Zacco platypus is more adaptable to target stream than Puntungia herzi Herzenstein.

부산 온천천 일원의 침수 분석을 위한 레이더 강우와 관측 강우의 시뮬레이션 결과 비교 분석

이수원 ( Suwon Lee ),( Nobel Ballhysa ),김소연 ( Soyeon Kim ),변성준 ( Seongjoon Byeon ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.5

Recently, due to the effects of climate change, torrential rains are increasing in frequency . This increasing frequency in which a large amount of rainfall falls within a short period increases the probability of flooding that can cause enormous human and material damage. Therefore, this study attempts to understand the characteristics of the inundation basin in the study area using rainfall data analyzed through radar images and 10-minute observed rainfall data from the Korea Meteorological Administration rainfall observatory for the Busan Oncheoncheon basin, which is an area regularly subject to flooding. To this end, a numerical model is constructed using the MIKE-Urban program with local input data (such as the DEM of the study area), and the radar rainfall data’s accuracy is verified through a comparative analysis of the observed meteorological service rainfall data and radar rainfall data. Hydrographs obtained for both rainfall data sets (observed and radar) for the August 2014 flooding event are compared as well as the flooding extents generated when simulating using the MIKE-Urban model. Results show that the difference between flood extents (<5%) is small enough to consider radar rainfall a suitable dataset for rainfall input in regions without rainfall gauges.