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Environments 2014, 1(2), 157-180; doi:10.3390/environments1020157

Assessing the Influence of Nonpoint Source and Discharge Changes on Water Quality in a Tidal River Estuary Using a Three-Dimensional Model

1
Department of Civil and Disaster Prevention Engineering, National United University, Miaoli 36003, Taiwan
2
National Applied Research Laboratories, Taiwan Typhoon and Flood Research Institute, Taipei 10093, Taiwan
*
Author to whom correspondence should be addressed.
Received: 27 September 2014 / Revised: 18 November 2014 / Accepted: 18 November 2014 / Published: 26 November 2014
(This article belongs to the Special Issue Selected Papers from 2014 Global Land Project (GLP) Asia Conference)
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Abstract

The change of nonpoint source and freshwater discharge as a result of land use change might affect the water quality in a river. In the current study, a coupled three-dimensional hydrodynamic and water quality model was created and applied to the Danshuei River estuarine system and its adjacent coastal ocean. The hydrodynamic and water quality models were validated using observations of water surface elevation, salinity distribution and water quality state variables. The predictions of hydrodynamics, salinity, dissolved oxygen and nutrients from the model simulation quantitatively agreed with the observational data. The validated model was then used to investigate the possible effects of the nonpoint source and freshwater discharge changes at the upstream reaches on water quality conditions in the Danshuei River estuarine system. Three scenarios were investigated to predict the dissolved oxygen using model simulations. The simulated results indicated that increasing nonpoint sources at the upstream reaches degraded the dissolved oxygen under low flow conditions. However, increasing freshwater discharges at the upstream reaches would overcome the loadings of the nonpoint source, which would result in increasing the dissolved oxygen in the tidal river estuary. The model can provide a useful tool for developing management practices for nonpoint sources to protect the water quality in the estuarine system. View Full-Text
Keywords: land use; nonpoint source; modeling; hydrodynamics; water quality; tidal estuarine system; Danshuei River land use; nonpoint source; modeling; hydrodynamics; water quality; tidal estuarine system; Danshuei River
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, W.-C.; Chan, W.-T. Assessing the Influence of Nonpoint Source and Discharge Changes on Water Quality in a Tidal River Estuary Using a Three-Dimensional Model. Environments 2014, 1, 157-180.

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