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- W2183694920 abstract "Virginia citizens expressed concern in the mid-90’s during public meetings in the Shenandoah-Potomac Tributary Strategy process that the sediment and nutrient loads estimated by Phase 4.3of the Chesapeake Bay Program’s watershed model (CBWM; Donigian et al., 1990) wereoverestimated for agricultural areas within the Virginia portion of the Shenandoah River Basin.To address this concern, a water quality/quantity monitoring program was initiated in two studywatersheds – Long Glade Creek and Mossy Creek – to collect data for evaluating the impacts ofvarious land uses within the Shenandoah Valley in Virginia. These data were then used toevaluate the calibration of corresponding CBWM model segments. Since the CBWM is anapplication of the Hydrological Simulation Program – Fortran (HSPF; Donigian et al., 1994)model, the HSPF calibration guidance – HSPEXP (Lumb et al., 1994) – was used to calibratehydrology, while a “weight of evidence” approach (Donigian and Love, 2003) was used to guidethe calibration of sediment and nutrient components for the two study watersheds. Two sets ofmodel inputs were created for each of these watersheds – one set using “regional” averagedcalibrated parameter values from CBWM model segment 190, and the other set using “local”parameter values that were calibrated against the observed data collected from Long Glade Creekand Mossy Creek. The hydrology, sediment, and nitrogen components in the study watershedsall achieved reasonable calibrations with observed data. Cumulative unit-area flow, sedimentloads, and nitrogen loads produced by CBWM model segment 190 all appeared to be reasonablein comparison with output from the study watersheds. Phosphorus, however, could not becalibrated through typical parameter adjustments. A comparison of phosphorus rating curvesbetween observed data and simulated CBWM data indicated large discrepancies. The suspectedsource of the phosphorus mis-specification is the “Special Actions” section in the HSPF inputfiles, where P application rates and/or distributions are specified. These aspects were beyond thescope of the present study and were held constant in all model input files." @default.
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- W2183694920 date "2013-11-14" @default.
- W2183694920 modified "2023-09-24" @default.
- W2183694920 title "SIMULATED LOADS IN TWO VIRGINIA WATERSHEDS USING LOCAL AND REGIONAL CALIBRATIONS" @default.
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- W2183694920 doi "https://doi.org/10.13031/2013.18079" @default.
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