BMP Evaluation for Nutrient Control in a Subtropical Reservoir Watershed Using SWAT Model

DOI

10.2991/rsete.2013.221How to use a DOI?

Keywords

Best Management Practices (BMPs), nonpoint source pollution, nutrient, SWAT model, uncertainty analysis

Abstract

The eutrophication problem that results from the inappropriate management in upstream watershed is prevailing among most reservoirs in Taiwan. As a result, implementation of appropriate Best Management Practices (BMPs) in upland watershed has proved to be the most effective measure to reduce or alleviate the nutrient loadings and the risk of eutrophication. This study aims to employ the uncertainty analysis and risk probability on SWAT (Soil and Water Assessment Tool) simulation for assessing the effectiveness of various BMP scenarios implemented in Feitsui reservoir watershed. The SWAT model was applied to assess the water quality impacts due to the implementation of various BMP scenarios. Five BMPs were selected and implemented on each agricultural land for overall evaluation of pollution reduction efficiency both at field and watershed scales. Finally, the effects of uncertainty in model input parameters on pollution reduction efficiency of BMPs are evaluated using constrained Monte Carlo simulation based on Latin hypercube sampling (LHS) and Orthogonal sampling (OS) schemes. Moreover, the Cumulative Distribution Functions (CDF) of average annual TP and chlorophyll a concentrations were created for further assessment on eutrophication risk. The simulation results show that the reduction of eutrophication risk approaches 13% (from 15 to 2%) for Caelson Trophic Satus Index (CTSI) methods based on implementation of 5 BMPs (a combined BMP scenario). Overall, this study concludes that incooperating uncertainty analysis in modeling will provide model output with specific probability, which not only assists the decision-maker in developing BMP and TMDL plans but also assesses the reliability of NPS pollution control strategies and risk of water quality degradation.

Copyright

© 2013, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Chu Tzyy-woei
AU  - Shirmohammadi Adel
AU  - Lin Yu-cheng
AU  - Huang Yu-chi
PY  - 2013/08
DA  - 2013/08
TI  - BMP Evaluation for Nutrient Control in a Subtropical Reservoir Watershed Using SWAT Model
BT  - Proceedings of the 2013 the International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE 2013)
PB  - Atlantis Press
SP  - 912
EP  - 915
SN  - 1951-6851
UR  - https://doi.org/10.2991/rsete.2013.221
DO  - 10.2991/rsete.2013.221
ID  - Tzyy-woei2013/08
ER  -