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Title: Observation and Estimation of Evapotranspiration from an Irrigated Green Roof in a Rain-Scarce Environment

While the rain-driven evapotranspiration (ET) process has been well-studied in the humid climate, the mixed irrigation and rain-driven ET process is less understood for green roof implementations in dry regions, where empirical observations and model parameterizations are lacking. This paper presents an effort of monitoring and simulating the ET process for an irrigated green roof in a rain-scarce environment. Annual ET rates for three weighing lysimeter test units with non-vegetated, sedums, and grass covers were 2.01, 2.52, and 2.69 mm d -1, respectively. Simulations based on the three Penman–Monteith equation-derived models achieved accuracy within the reported range of previous studies. Compared to the humid climate, the overestimation of high ET rates by existing models is expected to cause a larger error in dry environments, where the enhanced ET process caused by repeated irrigations overlapped with hot, dry conditions often occurs during summer. The studied sedum species did not show significantly lower ET rates than native species, and could not effectively take advantage of the deep moisture storage. Therefore, native species, instead of the shallow-rooted species commonly recommended in humid climates, might be a better choice for green roofs in rain-scarce environments.
Authors:
ORCiD logo [1] ;  [2] ;  [3]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Civil and Environmental Engineering
  3. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Mechanical Engineering
Publication Date:
Report Number(s):
PNNL-SA-132939
Journal ID: ISSN 2073-4441; PII: w10030262
Grant/Contract Number:
AC05-76RL01830; IIA-1208732
Type:
Accepted Manuscript
Journal Name:
Water (Basel)
Additional Journal Information:
Journal Name: Water (Basel); Journal Volume: 10; Journal Issue: 3; Journal ID: ISSN 2073-4441
Publisher:
MDPI
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF); Univ. of Utah (United States)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; stormwater management; green roof; evapotranspiration; sedum; irrigation; rain-scarce environments; weighing lysimeter
OSTI Identifier:
1457773

Feng, Youcan, Burian, Steven, and Pardyjak, Eric. Observation and Estimation of Evapotranspiration from an Irrigated Green Roof in a Rain-Scarce Environment. United States: N. p., Web. doi:10.3390/w10030262.
Feng, Youcan, Burian, Steven, & Pardyjak, Eric. Observation and Estimation of Evapotranspiration from an Irrigated Green Roof in a Rain-Scarce Environment. United States. doi:10.3390/w10030262.
Feng, Youcan, Burian, Steven, and Pardyjak, Eric. 2018. "Observation and Estimation of Evapotranspiration from an Irrigated Green Roof in a Rain-Scarce Environment". United States. doi:10.3390/w10030262. https://www.osti.gov/servlets/purl/1457773.
@article{osti_1457773,
title = {Observation and Estimation of Evapotranspiration from an Irrigated Green Roof in a Rain-Scarce Environment},
author = {Feng, Youcan and Burian, Steven and Pardyjak, Eric},
abstractNote = {While the rain-driven evapotranspiration (ET) process has been well-studied in the humid climate, the mixed irrigation and rain-driven ET process is less understood for green roof implementations in dry regions, where empirical observations and model parameterizations are lacking. This paper presents an effort of monitoring and simulating the ET process for an irrigated green roof in a rain-scarce environment. Annual ET rates for three weighing lysimeter test units with non-vegetated, sedums, and grass covers were 2.01, 2.52, and 2.69 mm d-1, respectively. Simulations based on the three Penman–Monteith equation-derived models achieved accuracy within the reported range of previous studies. Compared to the humid climate, the overestimation of high ET rates by existing models is expected to cause a larger error in dry environments, where the enhanced ET process caused by repeated irrigations overlapped with hot, dry conditions often occurs during summer. The studied sedum species did not show significantly lower ET rates than native species, and could not effectively take advantage of the deep moisture storage. Therefore, native species, instead of the shallow-rooted species commonly recommended in humid climates, might be a better choice for green roofs in rain-scarce environments.},
doi = {10.3390/w10030262},
journal = {Water (Basel)},
number = 3,
volume = 10,
place = {United States},
year = {2018},
month = {3}
}