• Title/Summary/Keyword: water quality model

Search Result 199, Processing Time 0.09 seconds

Development of a Genetic Algorithm for the optimization in River Water Quality Management System (하천 수질관리 시스템에서 최적화를 위한 유전알고리즘의 개발)

  • 성기석;조재현
    • Proceedings of the Korean Operations and Management Science Society Conference
    • /
    • 2001.10a
    • /
    • pp.203-206
    • /
    • 2001
  • Finding the optimal solution in the river water quality management system is very hard with the non-linearity of the water quality model. Many suggested methods for that using the linear programming, non-linear programming and dynamic programming, are failed to give an optimal solution of sufficient accuracy and satisfaction. We studied a method to find a solution optimizing the river water quality management in the aspect of the efficiency and the cost of the waste water treatment facilities satisfying the water Quality goals. In the suggested method, we use the QUAL2E water quality model and the genetic algorithm. A brief result of the project to optimize the water quality management in the Youngsan river is presented.

  • PDF

Water Quality Model Development for Loading Estimates from Paddy Field (논에서의 오염부하 예측을 위한 범용모형 개발)

  • Jeon, Ji-Hong;Yoon, Chun-Gyeong;Hwang, Ha-Sun;Yoon, Kwang-Sik
    • Proceedings of the Korean Society of Agricultural Engineers Conference
    • /
    • 2003.10a
    • /
    • pp.579-582
    • /
    • 2003
  • Water quality model applicable paddy field was developed using field experiment during $1999{\sim}2002$. This model involves inputs from fertilization and sediment release as dirac delta function and continuous source function, respectively, and can simulate various processes such as ponded depth, surface drainage, total nitrogen concentration and total phosphorus concentration in a daily basis. Water quality model for paddy field developed in this study is simply, needs little parameters, but appeared high applicability to evaluate paddy filed drainage.

  • PDF

The Study on Methods for Setting of Water Quality Goal and Estimation of Allocation Loads on TMDL System Using a Dynamic Water Quality Model (동적모델을 이용한 수질오염총량제 목표수질 설정 및 할당부하량 산정방안 연구)

  • Kim, Eun-Jung;Park, Bae-Kyung;Shin, Dong-Suk;Kim, Yong-Seok;Rhew, Doug-Hee
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.36 no.9
    • /
    • pp.629-640
    • /
    • 2014
  • In this study, the applicability of dynamic water quality model to TMDL system was examined, methods for setting of water quality goal and estimation of allocation loads were suggested and results of applying these methods were analyzed. HSPF model was applied for Miho stream basin as a dynamic water quality model. The model was calibrated using measurement data obtained in 2009~2010 and showed satisfactory performance in predicting daily variations of flow rate and BOD concentration. Methods for TMDL application were categorized into 3 cases; water quality management (1) considering low flow condition(Case I), (2) considering entire period of the year (Case II) and (3) considering the worst water quality condition (Case III). BOD water quality goals at the end of Miho stream watershed increased in the order of Case IICase I>Case III. If further researches on base precipitation and method for model input of nonpoint source pollutant were carried out, water quality could be managed more reasonably and scientifically by applying dynamic water quality model to TMDL. The result of this study is expected to be used as primary data for TMDL using dynamic water quality model.

Changing Characteristics of Parameters in Model for Water Quality Prediction (수질예측모델에서의 매개변수 변화특성(지역환경 \circled2))

  • 김선주;김성준;이석호
    • Proceedings of the Korean Society of Agricultural Engineers Conference
    • /
    • 2000.10a
    • /
    • pp.578-583
    • /
    • 2000
  • In order to operate water quality model for a lake or a channel, user should examine the all kinds of parameters and should know how them react to the model for calculating the pollution which are happened from the watershed or are reacted in the water. The aim of this study is analyzing the characteristics of parameters which are used by a water quality model (CE-QUAL-W2), so that we are trying to find out how them to react to the model for calculating the many kinds of pollution.

  • PDF

A Study on the Application of GSIS for the Simulation of Stream Water Quality (하천수질모의를 위한 GSIS적용 연구)

  • 최연웅;성동권;전형섭;조기성
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
    • /
    • v.19 no.3
    • /
    • pp.253-261
    • /
    • 2001
  • Nowadays, various water quality prediction models have been studied, then these models can support the method which evaluate the effect of various alternative water quality management by simulation without experimentation. But, It is necessary to create complex input data file for applying these water quality model and even though the appropriate result is extracted, it is impossible to use as decision making data effectively because of the limitation of expression of model itself. As this study is about the stream water quality modeling, for overcoming the model's above limitation, by developing an interface which can calculate the pollutant load of watershed, I could create a input data file and visualize the simulation result so that I was going to integrate water quality model and GSIS using Flexible coupling applied to GSIS in the pre-process and post-process on model. The QUAL2E model, used in this study, is verified by stream water quality model in previous various results of study and has many examples through previous study, because that is appropriate to water quality model, especially in Korea, and comparatively accurate and their usage is quite simple.

  • PDF

An Integrated Method for Water Environment Management Using Web Based Model and GIS (웹 기반의 모형과 지리정보시스템을 이용한 통합적 수환경관리기법)

  • Mun, Hyun-Saing;Kim, Joon Hyun;Kim, Chong-Chaul
    • Journal of Environmental Impact Assessment
    • /
    • v.10 no.3
    • /
    • pp.235-243
    • /
    • 2001
  • Since the middle of 1990s, in Korea a few researches on the optimal management technologies combining numerical model and GIS for the management of water environment in drinking watershed area and reservoir such as Paldang Lake have been carried out. In this study, the integrated water environment management system was been suggested to efficiently reflect the public awareness of the environment by integrating the web based distributed data collection system, GIS, public hearing system and water quality model. As all the components of the system have been developed using the World Wide Web and all data have been collected from the relevant agencies through the Internet, the water quality model could be implemented on the web directly. In consequence, the environmental geographic information in Paldang Lake could be acquired and analyzed through the Internet. The system can rapidly respond to the public right to know on environment, so the public will willingly participate in the governmental projects on environment. To verify the usability of the developed system, it has been applied to Paldang Lake. Especially when the web based model has been used, users can easily and confidentially get the prediction results by applying the minimum number of parameters for the water quality model. This model will provide clearness and scientific bases in the process of water quality prediction for the sensitive sites where there are critical conflicts between the residents and the developers. In this study, rapid water environment management technique without spatial and time limit has been suggested, which can contribute to the efforts on the government and the public participation.

  • PDF

Development and Application of Dynamic Water Quality Model in Nakdong River (동적수질해석모형의 개발과 낙동강에의 적용)

  • Kwon, Na-Young;Choi, Hyun-Gu;Yu, Jae-Jung;Han, Kun-Yeun
    • Journal of Korea Water Resources Association
    • /
    • v.43 no.3
    • /
    • pp.283-294
    • /
    • 2010
  • The objective of this study is to develop an accurate and stable dynamic water quality model which is capable of reflecting various flows and irregular cross sections and handling numerical oscillations under the low flow conditions. In order to solve the oscillation problem under the low flow conditions, diffusive wave method was applied to the low flow condition in developing a hydraulic model, DyHYD. DyQUAL is also developed as a water quality model to calculate up to 12 water quality variables including autochthonous BOD, water temperature, DO, TN and TP. The developed model is applied to both hypothetical river channels and actual Nakdong river watershed. Additionally, the applicability and reliability of the models are verified by comparing simulation results with observed values. Nash-Sutcliffe coefficients are estimated by comparison between simulation results and observed values. In the calibration and verification process, the coefficients varies from 0.391 to 0.591 and 0.704 to 0.902 for discharge, BOD, TN and TP, respectively.

Development of a Stream Water Quality Model (QUAL-NIER) for the Management of Total Maximum Daily Loads (수질오염총량관리를 위한 하천수질모델(QUAL-NIER) 개발)

  • Park, Jun Dae;Shin, Dong Seok;Kim, Moon Sook;Kong, Dong Soo;Rhew, Doug Hee;Jung, Dong-Il;Na, Eun Hye
    • Journal of Korean Society on Water Environment
    • /
    • v.24 no.6
    • /
    • pp.784-792
    • /
    • 2008
  • Greater focus must be placed on ensuring that the water quality model (WQM) reflects the objective of its application and the characteristics of the water environment properly before it is selected. In the development or application of WQM, various factors influencing the model predictions should be reviewed so that it can perform more properly and reasonably based on scientific theory. This study reviewed the characteristic of existing WQM and the domestic river environment to find the requirements of the model application for TMDLs management in Korea. In this study, a water quality model, QUAL-NIER, was developed based on the USEPA's QUAL2E. The core structure and reaction scheme of the model was established followed by the formulation of equations according to the scheme with some supplements on the reaction mechanisms which are necessary for domestic rivers. Algorithms on the equations were set up and programmed to form a computer-based model. The developed model, QUAL-NIER was applied to the main stem of the Nakdong river. The model was calibrated and verified to data measured in 2004. The model results displayed good agrement with the field measurements for both calibration and verification. From this study, it was concluded that the developed QUAL-NIER model was very powerful with regard to the water quality simulation in domestic rivers.

Development and Application of Multiple Box Water Quality Model for Estuary Reservoirs (담수호 Multiple Box 수질모형의 개발과 적용)

  • 임종환;권순국
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.31 no.4
    • /
    • pp.111-122
    • /
    • 1989
  • A multiple box model which is suitable for the prediction of water quality in shallow lakes with active mixing is a water quality model expected to be used widely in estuary reservoir. In this study, a multiple box water quality model for estuary reservoirs (MBQER) was developed arid the applicability of the MBQER was tested by applying data obtained from Asan-estuary reservoir. The results of this study can be summarized as follows. 1. The MBQER, dynamic water quality model, was developed to estimate 10-day water qualities of estuary reservoirs. For the proper analysis and the application of hydraulics needed to build a model, lake hydraulics was simplified by condisering only hydrological inflow and lake mixing currents. The box division in the MBQER is longitudinal one dimension for upper and middle part, and two layers for lower part of the reservoir. 2. The methods of box division for the multiple box model were ekamined and applied to Asan-estuary reservoir. For determining the number of boxes, Pe number and Pk number were used. In case of three boxes, the error by the model simplification would be estimated about 5 % Therefore, in Asan reservoir, the proper number of boxes was three. 3. The MBQER was calibrated and verified using measured data in Asan-estuary reservoir from 1986 to 1988. The Root Mean Squares(RMS) for the differences between measured data and simulated results by the MBQER were 1.10$^{\circ}$C C for water temperature, 75.8mg/1 for salinity, 0.082mg/1 for total-phosphorus showing good estimations. 4. Through the simulation of water temperature and salinity by the MBQER, the exchange flow and the mixing coefficients for the estuary lake were determined. As a result of simulation, the horizontal mixing coefficients in Asan-estuary reservoir were in the range of 1.07X 105 to 1.12X 105 cm$^2$/sec and vertical mixing coefficient was 2.90X 10-1 cm$^2$/sec.

  • PDF