A review of ET measurement techniques for estimating the water requirements of urban landscape vegetation

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

doi:10.1080/1573062x.2012.726360

Cited by 97 publications

(94 citation statements)

References 86 publications

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“…Vegetation index methods, as applied in this study, use optical bands to estimate canopy greenness, which is directly related to the transpiration component of ET. These methods are appropriate for monitoring urban landscapes where maintaining healthy green vegetation is the ultimate goal [11,12]. Nouri et al [22] showed that ET could be predicted at the study site using high-resolution WorldView 2 imagery by creating masks denoting individual classes of plants.…”

Section: Remote Sensing Methodsmentioning

confidence: 99%

“…In many agricultural systems, there is a uniformity of density, height, and water availability which facilitates a conventional approach for ET measurement, although these approaches are not without their challenges. In the case of non-agricultural systems, such as inner-city gardens and urban parks, the heterogeneous nature of vegetation and landscapes, together with the high spatial and temporal variability of soil and water characteristics, and the variability of management and watering practices [10] contribute to greatly increased complexity in the ET estimation of urban vegetation [11,12]. This is of even more concern when wastewater irrigation is occurring due to the risk of nutrient leaching that, in the long term, can result in soil and groundwater contamination [10,13].…”

Section: Need For Evapotranspiration (Et) Estimates For Urban Landscapesmentioning

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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Section: Remote Sensing Methodsmentioning

confidence: 99%

Section: Need For Evapotranspiration (Et) Estimates For Urban Landscapesmentioning

confidence: 99%

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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“…The impact of available soil water sampling systems on vadose zone behaviour increases the uncertainty in selecting a representative sample (Peters and Durner, 2009). This is even more problematic in mixed vegetation urban green spaces (Nouri et al, 2012). High spatial and temporal variability of vegetation species, canopy covers and microclimates in urban landscape vegetation leads to a high variability of soil water characteristics and soil water accessibility.…”

Section: Introductionmentioning

confidence: 99%

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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“…(c) considered to be classified as optimal (Camargo and Sentelhas, 1997) ( Figure 1). Energy balance approach allows for evapotranspiration estimation even under inadequate soil water supply conditions, besides turning out to be a straightforward and cheap approach (Nouri et al, 2012). Given its applicability and direct relationship with other methods often has been adopted as a reference for evapotranspiration estimation (Qiu et al, 2015).…”

Section: IIImentioning

confidence: 99%

Performance of Reference Evapotranspiration Estimation Methods at the Southern Paraná, Brazil

Schiebelbein¹,

Pereira²

2018

IJAERS

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A review of ET measurement techniques for estimating the water requirements of urban landscape vegetation

Cited by 97 publications

References 86 publications

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

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

Variability of drainage and solute leaching in heterogeneous urban vegetation environs

Performance of Reference Evapotranspiration Estimation Methods at the Southern Paraná, Brazil

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