Accuracy and precision of nitrate load estimation with different sampling frequencies for Illinois agricultural watersheds

Yiping Guo, Christina W.S. Tsai, Misganaw Demissie

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The total mass of nitrate passing a gauging station during a period of study may be estimated based on infrequently monitored nitrate concentration data. To examine the accuracy and precision of these nitrate load estimates, a Monte Carlo sub-sampling study was conducted using six years of daily nitrate concentration and daily average discharge data at one gauging station on a medium size river in central Illinois draining predominantly agricultural lands. The daily nitrate concentration data set was sub-sampled repetitively to generate multiple sub-samples that might have been drawn if a different sampling frequency was used. Load estimation methods from three broad classes were used to calculate nitrate loads based on the generated sub-samples. It was found that the regression-based estimators are all positively biased when applied for the subject study site. The simple ratio estimator and the flow-weighted average estimator, however, are almost bias free and have an overall performance similar to that of the rating curve estimator. Copyright ASCE 2004.

Original languageEnglish (US)
Title of host publicationBridging the Gap
Subtitle of host publicationMeeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
DOIs
StatePublished - Dec 1 2004
EventWorld Water and Environmental Resources Congress 2001 - Orlando, FL, United States
Duration: May 20 2001May 24 2001

Publication series

NameBridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
Volume111

Other

OtherWorld Water and Environmental Resources Congress 2001
CountryUnited States
CityOrlando, FL
Period5/20/015/24/01

ASJC Scopus subject areas

  • Water Science and Technology

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    Guo, Y., Tsai, C. W. S., & Demissie, M. (2004). Accuracy and precision of nitrate load estimation with different sampling frequencies for Illinois agricultural watersheds. In Bridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001 (Bridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001; Vol. 111). https://doi.org/10.1061/40569(2001)417