Water requirements of urban landscape plants: A comparison of three factor-based approaches

Nouri, Hamideh; Beecham, Simon; Hassanli, Ali; Kazemi, Fatemeh

doi:10.1016/j.ecoleng.2013.04.025

Cited by 52 publications

(37 citation statements)

References 17 publications

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“…The outcomes of other research conducted at the same experimental site confirm that the irrigation application was the optimally matched to the water requirements of mixed landscape vegetation to produce an acceptable level of plant health and aesthetics Nouri et al, 2013). Thus, the potential excess nutrient loading cannot result from over-irrigation.…”

Section: Cumulative Nutrients Leachingmentioning

confidence: 55%

Variability of drainage and solute leaching in heterogeneous urban vegetation environs

Nouri

Beecham

Hassanli

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. Deep percolation enhancement from recycled wastewater irrigation may contribute to salt accumulation and water table elevation that can ultimately cause soil and ground water degradation. Variation of drainage rate and solute leaching were investigated in an urban park containing heterogeneous landscape plants that were irrigated with recycled wastewater. Field monitoring was undertaken at Veale Gardens in the Adelaide Parklands, Australia. Based on landscape variation in Veale Gardens, two landscape zones were defined: one being largely covered with turf grasses with few trees and shrubs (MG) with the second zone being mostly trees and shrubs with intermittent turf grasses (MT). Experiments were performed on two zero-tension lysimeters placed horizontally 100 cm below ground to monitor the variation of volume and quality indicators of drained water for four seasons. The outcomes showed a significant variation of drainage quantity and quality in the MT and MG zones. The low vegetation cover in the MG zone resulted in more drained water than in the high vegetation cover (MT zone). In both zones, more drainage water was collected in winter than in other seasons. This is in spite of the input water showing a maximum rate in summer. The seasonal salinities measured in the two lysimeters showed very similar trends with the lowest salinity rate in autumn with the levels increasing through winter and spring. Chemical analyses of leachate solute and salt loading indicated no impact from using recycled wastewater.

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Section: Cumulative Nutrients Leachingmentioning

confidence: 55%

Variability of drainage and solute leaching in heterogeneous urban vegetation environs

Nouri

Beecham

Hassanli

et al. 2013

Hydrol. Earth Syst. Sci.

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show abstract

“…The SWB shows that water management at Veale Gardens efficiently maintains the plants without over-irrigating the landscaping [13,20]. The observed leaching fraction of 0.16 is a reasonable value to keep soil salinity within the range tolerated by the mixed plantings [45].…”

Section: Discussionmentioning

confidence: 99%

“…Nouri et al [20] compared three observational-based methods of ET estimation in urban landscape vegetation. Three adjustment factors, or landscape plant coefficients, for reference ET (ET o ), namely WUCOLS, plant factor (PF), and a crop stress factor for the Irrigated Public Open Space (IPOS_2008) method, were estimated.…”

Section: The Wucols Methodsmentioning

confidence: 99%

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Comparing Three Approaches of Evapotranspiration Estimation in Mixed Urban Vegetation: Field-Based, Remote Sensing-Based and Observational-Based Methods

et al. 2016

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Despite being the driest inhabited continent, Australia has one of the highest per capita water consumptions in the world. In addition, instead of having fit-for-purpose water supplies (using different qualities of water for different applications), highly treated drinking water is used for nearly all of Australia's urban water supply needs, including landscape irrigation. The water requirement of urban landscapes, particularly urban parklands, is of growing concern. The estimation of evapotranspiration (ET) and subsequently plant water requirements in urban vegetation needs to consider the heterogeneity of plants, soils, water, and climate characteristics. This research contributes to a broader effort to establish sustainable irrigation practices within the Adelaide Parklands in Adelaide, South Australia. In this paper, two practical ET estimation approaches are compared to a detailed Soil Water Balance (SWB) analysis over a one year period. One approach is the Water Use Classification of Landscape Plants (WUCOLS) method, which is based on expert opinion on the water needs of different classes of landscape plants. The other is a remote sensing approach based on the Enhanced Vegetation Index (EVI) from Moderate Resolution Imaging Spectroradiometer (MODIS) sensors on the Terra satellite. Both methods require knowledge of reference ET calculated from meteorological data. The SWB determined that plants consumed 1084 mm¨yr´1 of water in ET with an additional 16% lost to drainage past the root zone, an amount sufficient to keep salts from accumulating in the root zone. ET by MODIS EVI was 1088 mm¨yr´1, very close to the SWB estimate, while WUCOLS estimated the total water requirement at only 802 mm¨yr´1, 26% lower than the SWB estimate and 37% lower than the amount actually added including the drainage fraction. Individual monthly ET by MODIS was not accurate, but these errors were cancelled out to give good agreement on an annual time step. We conclude that the MODIS EVI method can provide accurate estimates of urban water requirements in mixed landscapes large enough to be sampled by MODIS imagery with 250-m resolution such as parklands and golf courses.

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“…The NDWI characterizes the liquid water within vegetation by incorporating two different near infrared channels measured as a ratio, much like NDVI. The NDWI in urban areas has been used to further characterize the urban heat island [76], to describe the intensity of vegetation water use [77], and to assist in water boundary delineation [78].…”

Section: Biophysical Indicesmentioning

confidence: 99%

Supporting Global Environmental Change Research: A Review of Trends and Knowledge Gaps in Urban Remote Sensing

et al. 2014

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This paper reviews how remotely sensed data have been used to understand the impact of urbanization on global environmental change. We describe how these studies can support the policy and science communities' increasing need for detailed and up-to-date information on the multiple dimensions of cities, including their social, biological, physical, and infrastructural characteristics. Because the interactions between urban and surrounding areas are complex, a synoptic and spatial view offered from remote sensing is integral to measuring, modeling, and understanding these relationships. Here we focus on OPEN ACCESSRemote Sens. 2014, 6 3880 three themes in urban remote sensing science: mapping, indices, and modeling. For mapping we describe the data sources, methods, and limitations of mapping urban boundaries, land use and land cover, population, temperature, and air quality. Second, we described how spectral information is manipulated to create comparative biophysical, social, and spatial indices of the urban environment. Finally, we focus how the mapped information and indices are used as inputs or parameters in models that measure changes in climate, hydrology, land use, and economics.

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Water requirements of urban landscape plants: A comparison of three factor-based approaches

Cited by 52 publications

References 17 publications

Variability of drainage and solute leaching in heterogeneous urban vegetation environs

Variability of drainage and solute leaching in heterogeneous urban vegetation environs

Comparing Three Approaches of Evapotranspiration Estimation in Mixed Urban Vegetation: Field-Based, Remote Sensing-Based and Observational-Based Methods

Supporting Global Environmental Change Research: A Review of Trends and Knowledge Gaps in Urban Remote Sensing

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