Observation and Estimation of Evapotranspiration from an Irrigated Green Roof in a Rain-Scarce Environment
Abstract
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:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Univ. of Utah, Salt Lake City, UT (United States). Dept. of Civil and Environmental Engineering
- Univ. of Utah, Salt Lake City, UT (United States). Dept. of Mechanical Engineering
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (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)
- OSTI Identifier:
- 1457773
- Report Number(s):
- PNNL-SA-132939
Journal ID: ISSN 2073-4441; PII: w10030262
- Grant/Contract Number:
- AC05-76RL01830; IIA-1208732
- Resource 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
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; stormwater management; green roof; evapotranspiration; sedum; irrigation; rain-scarce environments; weighing lysimeter
Citation Formats
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., 2018.
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. https://doi.org/10.3390/w10030262
Feng, Youcan, Burian, Steven, and Pardyjak, Eric. Fri .
"Observation and Estimation of Evapotranspiration from an Irrigated Green Roof in a Rain-Scarce Environment". United States. https://doi.org/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 = {Fri Mar 02 00:00:00 EST 2018},
month = {Fri Mar 02 00:00:00 EST 2018}
}
Web of Science
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