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Water 2016, 8(7), 292; doi:10.3390/w8070292

Development of Field Pollutant Load Estimation Module and Linkage of QUAL2E with Watershed-Scale L-THIA ACN Model

1
Water Pollution Load Management Research Division, National Institute of Environmental Research, Seogu, Incheon 22689, Korea
2
Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47907-2093, USA
3
Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA
4
Water Resources Research Centre, K-Water Institute, Daejeon 34350, Korea
5
Department of Regional Infrastructure Engineering, Kangwon National University, Chuncheon 24341, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Karl-Erich Lindenschmidt
Received: 22 April 2016 / Revised: 24 June 2016 / Accepted: 11 July 2016 / Published: 15 July 2016
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Abstract

The Long Term Hydrologic Impact Assessment (L-THIA) model was previously improved by incorporating direct runoff lag time and baseflow. However, the improved model, called the L-THIA asymptotic curve number (ACN) model cannot simulate pollutant loads from a watershed or instream water quality. In this study, a module for calculating pollutant loads from fields and through stream networks was developed, and the L-THIA ACN model was combined with the QUAL2E model (The enhanced stream water quality model) to predict instream water quality at a watershed scale. The new model (L-THIA ACN-WQ) was applied to two watersheds within the Korean total maximum daily loads management system. To evaluate the model, simulated results of total nitrogen (TN) and total phosphorus (TP) were compared with observed water quality data collected at eight-day intervals. Between simulated and observed data for TN pollutant loads in Dalcheon A watershed, the R2 and Nash–Sutcliffe efficiency (NSE) were 0.81 and 0.79, respectively, and those for TP were 0.79 and 0.78, respectively. In the Pyungchang A watershed, the R2 and NSE were 0.66 and 0.64, respectively, for TN and both statistics were 0.66 for TP, indicating that model performed satisfactorily for both watersheds. Thus, the L-THIA ACN-WQ model can accurately simulate streamflow, instream pollutant loads, and water quality. View Full-Text
Keywords: L-THIA ACN; pollutant loads; QUAL2E; simulation; TN; TP; water quality L-THIA ACN; pollutant loads; QUAL2E; simulation; TN; TP; water quality
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

Ryu, J.; Jang, W.S.; Kim, J.; Jung, Y.; Engel, B.A.; Lim, K.J. Development of Field Pollutant Load Estimation Module and Linkage of QUAL2E with Watershed-Scale L-THIA ACN Model. Water 2016, 8, 292.

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