Integrating quality assurance in project work plans of the U.S. Geological Survey

Shampine, William J.; Pope, Larry M.; Koterba, Michael T.

doi:10.3133/ofr92162

Cited by 14 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These historical records are postprocessed as required by USGS regulations. 33 The NCDC's air temperature and humidity data also have hourly resolution. In instances where finer resolution data were collected (e.g., 15 min time scales), we took the average for that hour.…”

Section: Methodsmentioning

confidence: 99%

“…Water quality measurements at USGS sites are collected at varying frequencies depending on the gauge, but in this study, we focused on plants with nearby surface gauges that collected at the hourly time scale. These historical records are postprocessed as required by USGS regulations . The NCDC’s air temperature and humidity data also have hourly resolution.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Environmental Temperature Change on the Efficiency of Coal- and Natural Gas-Fired Power Plants

Henry

Pratson

2016

Environ. Sci. Technol.

View full text Add to dashboard Cite

Modeling studies predict that droughts and hotter water and air temperatures caused by climate warming will reduce the efficiency (η) of thermoelectric plants by 0.12-0.45% for each 1 °C of warming. We evaluate these predictions using historical performance data for 39 open- and closed-loop coal and natural gas plants from across the U.S., which operated under daily and seasonal temperature fluctuations multiples greater than future average warming projections. Seven to 14 years of hourly water (Tw), dry-bulb air (Ta), and wet-bulb air (Twb) temperature recordings collected near each plant are regressed against efficiency to attain estimates of Δη per 1 °C increase. We find reductions in η with increased Tw (for open-loop plants) up to 1 order of magnitude less than previous estimates. We also find that changes in η associated with changes in Ta (open-loop plants) or Twb (closed-loop plants) are not only smaller than previous estimates but also variable; i.e., η rises with Ta or Twb for some plants and falls for others. Our findings suggest that thermoelectric plants, particularly closed-loop plants, should be more resilient to climate warming than previously expected.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%