Chonan and Asan city have been a focal point due to rapid development as the first station for Express Railroad and key cities West Coast Development Region. Gokgyo stream adjacent to the cities plays an important role as a drainage channel for an agriculture and a discharger of urban storm water. Water quality of the stream has been deteriorating caused by pollution sources such as a untreated wastewater discharge and runoff from the watershed. In this study, we conducted 4 surveys in April, May, July, and September to understand the current state of water quality for the stream and to make it possibe to predict future water-quality variation for future development. The system runs on a personal computer under the windows enviroment and provides extensive graphics using graphic user interface(GUI) for user-friendly assessment. Using the pull-down menus provided by the GUI panel, the user is able to operate the system by pointing and clicking the icon to identify the state of water-quality at locations concerned. Furthermore, we developed an integrated watershed management system. The constructed system could be a useful tool as a decesion maker for pollution source control strategy.

The sensitivity analysis of two short-term models (ISCST3, INPUFF2.5) is performed to improve the model accuracy. It appears that the sensitivities on the changes of wind speed, stack height and stack inner diameter in the near distance from source, stability and mixing height in the remote distance from source, are significant. Also, the gas exit velocity, stack inner diameter, gas temperature and air temperature which affect the plume rise have some effects on the concentration values of each model within the downwind distance where final plume rise is determined. And in modeling for the atmospheric dispersion of point pollutant source INPUFF2.5 can calculate amount, trajectory of puff and concentration versus time at each receptors. So, it is compatible to analyze distribution of point pollutants concentration at modeling area.

본 연구에서는 천이상태의 비포화 오염원 이송확산 특성을 분석하기 위하여 토양의 물리, 화확적 특성을 알고 있는 두 종류의 현장토양(SUS,KUS)을 이용하여 1차원 실내실험을 수행하였는데, 천이상태의 토양내 함수량과 오염원의 농도를 측정하기 위하여 본 연구에서 개발한 TDR을 이용한 농도측정법을 이용하였으며, 질량평형을 이용하여 측정방법의 정도도 분석하였다. 실험결과에 의하면 급격한 습윤전선의 전진에 따른 종형의 함수량 변화를 관측할 수 있었고, 이때

본 연구에서는 TDR의 반향파의 특성과 총토양전기전도도의 관계를 이용한 비포화 토양에서의 용존오염원 농도를 측정하는 방법을 개발하였다. 본 연구에서 제안한 방법은 두 가지 중요한 관계를 결합한 것으로 첫 번째는 함수량이 일정할 경우 전기전도도와 토양수 농도는 선형관계를 유지한다는 것이며, 두 번째는 천이상태의 용존여염원의 농도를 측정할 수 있게 하기 위해 함수량과 전기전도도의 관계를 설정하는 것이다. 함수량과 전기전도도의 관계를 추정하는 식들이 여러 연

The two-stage numerical model was used to study the relation between three-dimensional local wind model, advection/diffusion model of random walk method and second moment method in western coastal area for Korean peninsula. The first stage is three dimensional time-dependent local wind model which gives the wind field and vertical diffusion coefficient. The second stage is advection/diffusion model which uses the results of the first stage as input data. First, wind fields on Korean peninsula for none synoptic scale wind showed typical land and sea breeze circulation, and the emitted particles were transported by sea breeze for daytime, emissions return to sea by land breeze for nighttime.

하천과 대수층이 연결된 계에서 분산오염원이 유입될 경우에 지하수 수질을 평가할 수 있는 공간적분모형을 제안하였다. 제안된 공간적분모형은 불포화대의 영향이 고려되었으며, 다양한 수문 및 대수층 모의 조건에서 Richards 방정식과 이송-분산 방정식의 공간분포모형에 대한 수치해와 비교를 통하여 공간적분모형을 테스트하였다. 비교 결과에 의하면, 분산도비와 대수층의 두께가 큰 경우를 제외하고는 공간적분모형과 공간분포모형사이의 포화대수층의 평균농도 및 지하수유

In order to provide for the guidance on groundwater quality monitoring network design and also, to suggest the index to the solution of the contaminated groundwater remediation problems in the lake watershed, it is necessary to analyze the contaminant transport in the groundwater. The solute transport was analyzed in the lake watershed to investigate the behavior of the injected contaminant sources depend on the relationships between the point of contaminant sources and position of the lake. Three hypothetical groundwater flow systems, which is composed of a flow-through lake and two solute sources, were considered. The lakes located in the upper, middle, and lower portions of a watershed respectively. The transported contaminant was numerically simulated for five years by using MT3D contaminant transport model under the three-dimentional steady state conditions. From the above simulations, it can be concluded that the contaminant concentration was high as the contaminant source located at the upper position of a watershed, and the influence of the contaminant injection was large as the solute source located at the lower position. When the injection of contaminant was continued for one year without regard to the position of contaminant source and the lake, the influence of contaminant source was reached to bedrock.

It is necessary to examine the source contributions and the relationship between a receptor and sources for the resonable controlling of air pollution level of suspended particulate matters. Therefore, in this study, profiles of sources contributing to the concentration of suspended particulate matters, were developed and CMB model was applied to obtain information of source contributions and feasibility of CMB model application. According to the propose of this study, twenty-seven chemical species such as the elements, anions, and total carbon of thirty-six PM_10 and TSP data sets sampled at the Poˇmch`oˇn receptor site in Pusan for a 24-hr period from May to Aug. 1992, were analyzed and three (transportation, soil, marine) different source profiles were developed through the field measurement. Applying CMB model to transportation, soil, marine, the results of source contribution by CMB model showed that the case with TSP was more suitable for CMB model than that with PM_10. And the average contribution of transportation source to TSP and PM_10 concentration at Poˇmch`oˇn receptor was calculated as 90.66 ㎍/㎥(64%) and 23.27 (㎍/㎥(39%), respectively, which showed that the contribution by transportation was dominant. The validation of CMB model was performed by means of the results of contributions from marine source for the wind direction sectors.