| Development of the CAP Water Quality Model and Its
Application to the Geum River, Korea |
| Dongil Seo1†, Eunhyoung Lee2, and Kenneth Reckhow3 |
1Department of Environmental Engineering, Chungnam National University, Daejeon 305-764, Korea
2M-Cubic, Co. Ltd., Migun Technoworld, Daejeon 305-500, Korea
3Global Climate Change and Environmental Sciences, RTI International, Research Triangle Park, NC 27709, USA |
Corresponding Author:
Dongil Seo ,Tel: +82-42-821-6679, Fax: +82-42-822-5610, Email: seodi@cnu.ac.kr
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Received: October 4, 2010; Accepted: June 24, 2011. |
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| ABSTRACT |
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The completely mixed flow and plug flow (CAP) water quality model was developed for streams with discontinuous flows, a condition
that often occurs in low base flow streams with in-stream hydraulic structures, especially during dry seasons. To consider the
distinct physical properties of each reach effectively, the CAP model stream network can include both plug flow (PF) segments and
completely mixed flow (CMF) segments. Many existing water quality models are capable of simulating various constituents and their
interactions in surface water bodies. More complicated models do not necessarily produce more accurate results because of problems
in data availability and uncertainties. Due to the complicated and even random nature of environmental forcing functions, it is not possible
to construct an ideal model for every situation. Therefore, at present, many governmental level water quality standards and decisions
are still based on lumped constituents, such as the carbonaceous biochemical oxygen demand (CBOD), the total nitrogen (TN) or
the total phosphorus (TP). In these cases, a model dedicated to predicting the target concentration based on available data may provide
as equally accurate results as a general purpose model. The CAP model assumes that its water quality constituents are independent of
each other and thus can be applied for any constituent in waters that follow first order reaction kinetics. The CAP model was applied to
the Geum River in Korea and tested for CBOD, TN, and TP concentrations. A trial and error method was used for parameter calibration
using the field data. The results agreed well with QUAL2EU model predictions. |
| Keywords:
CAP model | Pollutant transport and fate | QUAL2E model | TMDL | Water quality modeling |
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