Testing the generalized complementary relationship of evaporation with continental-scale long-term water-balance data

J. Szilagyi, Richard Crago, Russell J. Qualls

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The original and revised versions of the generalized complementary relationship (GCR) of evaporation (ET) were tested with six-digit Hydrologic Unit Code (HUC6) level long-term (1981–2010) water-balance data (sample size of 334). The two versions of the GCR were calibrated with Parameter-Elevation Regressions on Independent Slopes Model (PRISM) mean annual precipitation (P) data and validated against water-balance ET (ETwb) as the difference of mean annual HUC6-averaged P and United States Geological Survey HUC6 runoff (Q) rates. The original GCR overestimates P in about 18% of the PRISM grid points covering the contiguous United States in contrast with 12% of the revised version. With HUC6-averaged data the original version has a bias of −25 mm yr−1 vs the revised version's −17 mm yr−1, and it tends to more significantly underestimate ETwb at high values than the revised one (slope of the best fit line is 0.78 vs 0.91). At the same time it slightly outperforms the revised version in terms of the linear correlation coefficient (0.94 vs 0.93) and the root-mean-square error (90 vs 92 mm yr−1).

Original languageEnglish
Pages (from-to)914-922
Number of pages9
JournalJournal of Hydrology
Volume540
DOIs
Publication statusPublished - Sep 1 2016

Fingerprint

water budget
evaporation
geological survey
runoff
parameter
code
rate

Keywords

  • Complementary relationship
  • Evaporation
  • Water balance

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Testing the generalized complementary relationship of evaporation with continental-scale long-term water-balance data. / Szilagyi, J.; Crago, Richard; Qualls, Russell J.

In: Journal of Hydrology, Vol. 540, 01.09.2016, p. 914-922.

Research output: Contribution to journalArticle

@article{caea7a626d1547869047c9bc2c728577,
title = "Testing the generalized complementary relationship of evaporation with continental-scale long-term water-balance data",
abstract = "The original and revised versions of the generalized complementary relationship (GCR) of evaporation (ET) were tested with six-digit Hydrologic Unit Code (HUC6) level long-term (1981–2010) water-balance data (sample size of 334). The two versions of the GCR were calibrated with Parameter-Elevation Regressions on Independent Slopes Model (PRISM) mean annual precipitation (P) data and validated against water-balance ET (ETwb) as the difference of mean annual HUC6-averaged P and United States Geological Survey HUC6 runoff (Q) rates. The original GCR overestimates P in about 18{\%} of the PRISM grid points covering the contiguous United States in contrast with 12{\%} of the revised version. With HUC6-averaged data the original version has a bias of −25 mm yr−1 vs the revised version's −17 mm yr−1, and it tends to more significantly underestimate ETwb at high values than the revised one (slope of the best fit line is 0.78 vs 0.91). At the same time it slightly outperforms the revised version in terms of the linear correlation coefficient (0.94 vs 0.93) and the root-mean-square error (90 vs 92 mm yr−1).",
keywords = "Complementary relationship, Evaporation, Water balance",
author = "J. Szilagyi and Richard Crago and Qualls, {Russell J.}",
year = "2016",
month = "9",
day = "1",
doi = "10.1016/j.jhydrol.2016.07.001",
language = "English",
volume = "540",
pages = "914--922",
journal = "Journal of Hydrology",
issn = "0022-1694",
publisher = "Elsevier",

}

TY - JOUR

T1 - Testing the generalized complementary relationship of evaporation with continental-scale long-term water-balance data

AU - Szilagyi, J.

AU - Crago, Richard

AU - Qualls, Russell J.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - The original and revised versions of the generalized complementary relationship (GCR) of evaporation (ET) were tested with six-digit Hydrologic Unit Code (HUC6) level long-term (1981–2010) water-balance data (sample size of 334). The two versions of the GCR were calibrated with Parameter-Elevation Regressions on Independent Slopes Model (PRISM) mean annual precipitation (P) data and validated against water-balance ET (ETwb) as the difference of mean annual HUC6-averaged P and United States Geological Survey HUC6 runoff (Q) rates. The original GCR overestimates P in about 18% of the PRISM grid points covering the contiguous United States in contrast with 12% of the revised version. With HUC6-averaged data the original version has a bias of −25 mm yr−1 vs the revised version's −17 mm yr−1, and it tends to more significantly underestimate ETwb at high values than the revised one (slope of the best fit line is 0.78 vs 0.91). At the same time it slightly outperforms the revised version in terms of the linear correlation coefficient (0.94 vs 0.93) and the root-mean-square error (90 vs 92 mm yr−1).

AB - The original and revised versions of the generalized complementary relationship (GCR) of evaporation (ET) were tested with six-digit Hydrologic Unit Code (HUC6) level long-term (1981–2010) water-balance data (sample size of 334). The two versions of the GCR were calibrated with Parameter-Elevation Regressions on Independent Slopes Model (PRISM) mean annual precipitation (P) data and validated against water-balance ET (ETwb) as the difference of mean annual HUC6-averaged P and United States Geological Survey HUC6 runoff (Q) rates. The original GCR overestimates P in about 18% of the PRISM grid points covering the contiguous United States in contrast with 12% of the revised version. With HUC6-averaged data the original version has a bias of −25 mm yr−1 vs the revised version's −17 mm yr−1, and it tends to more significantly underestimate ETwb at high values than the revised one (slope of the best fit line is 0.78 vs 0.91). At the same time it slightly outperforms the revised version in terms of the linear correlation coefficient (0.94 vs 0.93) and the root-mean-square error (90 vs 92 mm yr−1).

KW - Complementary relationship

KW - Evaporation

KW - Water balance

UR - http://www.scopus.com/inward/record.url?scp=84978128812&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84978128812&partnerID=8YFLogxK

U2 - 10.1016/j.jhydrol.2016.07.001

DO - 10.1016/j.jhydrol.2016.07.001

M3 - Article

AN - SCOPUS:84978128812

VL - 540

SP - 914

EP - 922

JO - Journal of Hydrology

JF - Journal of Hydrology

SN - 0022-1694

ER -