Quantification of Baseflow Contribution to Nutrient Export from a Agricultural Watershed

Kim, Geonha; Yoon, Jaeyong; Park, Kijung; Baek, Jongrak; Kim, Youngjoon

doi:10.11001/jksww.2015.29.3.347

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The auto-calibrated model underestimated the background level of phosphorous and Chl-a in the stream, although it simulated the excess algal growth well during summer seasons. For more accurate year-round simulations of phosphorous and Chl-a, the transport pathway of phosphorus from groundwater to the stream was introduced in the model (Figure 2), and the groundwater phosphorus concentration ranges for different land uses reported by various studies were considered during the recalibration [33][34][35][36][37]. Table 1 shows the groundwater soluble phosphorus concentrations obtained from the literature.…”

Section: Hspf Model Configuration and Calibrationmentioning

confidence: 99%

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HSPF-Based Assessment of Inland Nutrient Source Control Strategies to Reduce Algal Blooms in Streams in Response to Future Climate Changes

et al. 2021

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The HSPF model was modified to improve the growth-temperature formulation of phytoplankton and used to simulate Chl-a concentrations at the outlet of the Seom River watershed in Korea from 2025 to 2050 under four climate change scenarios: RCP 2.6, RCP 4.5, RCP 6.0, and RCP 8.5. The mean and median Chl-a concentrations increased by 5–10% and 23–29%, respectively, and the number of algal outbreak cases per year (defined as a day with Chl-a concentration ≥100 µg/L) decreased by 31–88% relative to the current values (2011–2015). Among the climate change scenarios, RCP 2.6 (stringent) showed the largest number of algal outbreak cases, mainly because of the largest yearly variability of precipitation and TP load. For each climate change scenario, three nutrient load reduction scenarios were in the HSPF simulation, and their efficiencies in reducing algal blooms were determined. Nonpoint source reduction in TP and TN from urban land, agricultural land, and grassland by 50% (S1) and controlling the effluent TP concentration of wastewater treatment plants (WWTPs) to 0.1 mg/L (S2) decreased algal outbreaks by 20–58% and 44–100%, respectively. The combination of effluent TP control of WWTPs during summer and S1 was the most effective management scenario; it could almost completely prevent algal outbreaks. This study demonstrates the cost effectiveness of using a season-based pollutant management strategy for controlling algal blooms.

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Section: Hspf Model Configuration and Calibrationmentioning

confidence: 99%

“…Thus, it is necessary to enhance nutrient control for both NPSs and PSs during the growing season. This seasonbased PS control strategy has been applied in San Diego, California, where the effluent standard for TP concentration is limited to 0.1 mg/L during the summer season [37,46,47].…”

Section: Source Management Scenariosmentioning

confidence: 99%