Transpiration coefficients for three Great Basin shrubs

Steinwand, A. L.; Harrington, Robert F.; Groeneveld, David P.

doi:10.1006/jare.2001.0794

Cited by 26 publications

(25 citation statements)

References 23 publications

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“…So, if well-watered, the studied sedum species could consume more water than grass, as also observed by Wolf and Lundholm [91]. Noticeably, both sedums and grass were observed to have higher K c than the native species [92], indicating the potential application of the native species in green roofs in dry environments given enough soil space for the longer and wider root systems.…”

Section: Parameterization For Evapotranspiration Modelingsupporting

confidence: 75%

“…The remaining 72% of irrigation cost would need to be offset by other potential benefits of the green roof, or the irrigation demand would need to be reduced to make projects balance cost and benefits in an economic sense. However, if the native species with the smaller K c [92] are available to grow in this study setting (i.e., assuming the same PET rates), they could live without any irrigation and harvest a minimum of 60 mm of rainwater for the next year's use (equal to 22 m 3 harvested rainwater for the studied green roof). Also, if a retrofitting is possible, harvesting of discharge water from air conditioning units and other nearby sources can be considered solutions.…”

Section: Irrigation Costmentioning

confidence: 99%

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

Feng

Burian

Pardyjak

2018

Water

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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.

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Section: Parameterization For Evapotranspiration Modelingsupporting

confidence: 75%

Section: Irrigation Costmentioning

confidence: 99%

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

Feng

Burian

Pardyjak

2018

Water

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“…SAVE is a deciduous shrub that develops new leaves in spring and maximizes growth through the summer, whereas ATCA is evergreen and spreads growth and water uptake over a longer annual cycle than SAVE. Similar to the present results, Steinwand et al (2001) reported a onethird higher rate of transpiration as a function of LAI for SAVE compared to A. lentiformis in Owens Valley, California, USA. Comparison to other studies (Allen et al, 1998).…”

Section: Meteorological Controls On E Lsupporting

confidence: 93%

Scaling sap flux measurements of grazed and ungrazed shrub communities with fine and coarse‐resolution remote sensing

et al. 2008

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“…Few examples exist of leaf-area measurements for rabbitbrush. One of the few examples is the work of Steinwand et al (2001) in which the transpiration coefficients of three Great Basin shrubs, including rabbitbrush, were compared. The leaf-area index was determined using the quadrant method at approximately monthly intervals during the summer months.…”

Section: Leaf-area Indexmentioning

confidence: 99%

“…(Table 5.6). Ludwig et al (1975); Depuit and Caldwell (1975) Creosote Bush 0.65 × i ai P Ludwig et al (1975); Barbour (1977) Rabbitbrush 0.041× i ai P Steinwand et al (2001) …”

Section: Leaf-area Indexmentioning

confidence: 99%

Geotechnical, Hydrogeologic and Vegetation Data Package for 200-UW-1 Waste Site Engineered Surface Barrier Design

Ward¹

2007

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SummaryFluor Hanford (FH) is designing and assessing the performance of engineered barriers for final closure of U-plant waste sites. The ideal barrier will minimize recharge and plant intrusion into the underlying waste, thereby providing protection for human health and the environment. FH is using the Pacific Northwest National Laboratory (PNNL) Subsurface Transport over Multiple Phases (STOMP) simulator as the primary design optimization tool for simulating surface barrier performance. PNNL is supporting FH barrier design activities. One of PNNL's responsibilities is to provide parameter values for the geotechnical, physical, hydraulic, and thermal properties of the materials comprising the barrier and the structural fill on which it will be constructed as well as parameters to allow simulation of plant effects. This report provides the required data package as well as the technical basis, rationale, and methodology used to obtain the parameter values.Best-estimate values for the hydraulic parameters of the soil and geotechnical materials to be used in the performance assessment analyses of the candidate barriers were developed. Hydraulic properties were directly measured for the Environmental Restoration and Disposal Facility spoil pile soils and the silt loam borrow-source soils. Hydraulic properties for the admixture of silt loam and pea gravel and for the silt admixture and quarry spalls were estimated by adjusting the silt-loam parameters for amount of the coarse material. Geotextile hydraulic properties, which were compiled from data reported in the literature. However, properties of the biointrusion layer were derived from the specified particle-size distribution. A summary of Brooks-Corey and van Genuchten parameters along with saturated hydraulic conductivity are presented for each material.Thermal properties also play a critical role in the water and energy balance. These properties were estimated using pedotransfer functions that take into account the mineralogy and water-retention relationships for the porous materials. Predicted properties compared well with literature values, but were generally higher than those reported for Hanford sediments.Plants play an important role in the function of engineered barriers, and accounting for the effects of plants on barrier performance requires a variety of input parameters. Owing to the number of species that may be used to revegetate engineered barriers, plant parameters were grouped on the basis of plant growth forms, e.g., forbs, grasses, and shrubs. Parameters are provided to allow an evaluation of the effects of canopy structure and color, rooting depth, and growth cycle on energy and water balance and ultimately barrier performance.v

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Transpiration coefficients for three Great Basin shrubs

Cited by 26 publications

References 23 publications

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

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

Scaling sap flux measurements of grazed and ungrazed shrub communities with fine and coarse‐resolution remote sensing

Geotechnical, Hydrogeologic and Vegetation Data Package for 200-UW-1 Waste Site Engineered Surface Barrier Design

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