Annual groundwater evapotranspiration mapped from single satellite scenes

Groeneveld, David P.; Baugh, W.; Sanderson, John S.; Cooper, David J.

doi:10.1016/j.jhydrol.2007.07.002

Cited by 95 publications

(110 citation statements)

References 32 publications

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“…NDVI is calculated utilising the great difference in canopy reflectance between the red and the near-infrared bands. Because of this chain of related properties, NDVI has been used as a valuable tool in estimating crop variables like LAI, crop biomass, grain yield and photosynthetic activity (Penuelas et al 1995;Broge and Mortensen 2002;Hansen and Schjoerring 2003;Groeneveld et al 2007;Xue et al 2007). Based on the above-mentioned data, this study explored the possibilities of estimating the RUE and HI from canopy reflectance by correlation analysis.…”

Section: Discussionmentioning

confidence: 99%

Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance

Luo

2011

Crop Pasture Sci.

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Abstract. Radiation-use efficiency (RUE, g/MJ) and the harvest index (HI, unitless) are two helpful characteristics in interpreting crop response to environmental and climatic changes. They are also increasingly important for accurate crop yield simulation, but they are affected by various environmental factors. In this study, the RUE and HI of winter wheat and their relationships to canopy spectral reflectance were investigated based on the massive field measurements of five nitrogen (N) treatments. Crop production can be separated into light interception and RUE. The results indicated that during a long period of slow growth from emergence to regreening, the effect of N on crop production mainly showed up in an increased light interception by the canopy. During the period of rapid growth from regreening to maturity, it was present in both light interception and RUE. The temporal variations of RUE APAR (aboveground biomass produced per unit of photosynthetically active radiation absorbed by the canopy) during the period from regreening to maturity had different patterns corresponding to the N deficiency, N adequacy and N-excess conditions. Moreover, significant relationships were found between the RUE APAR and the accumulative normalised difference vegetation index (NDVI) in the integrated season (R 2 = 0.68), between the HI and the accumulative NDVI after anthesis (R 2 = 0.89), and between the RUE grain (ratio of grain yield to the total amount of photosynthetically active radiation absorbed by the canopy) and the accumulative NDVI of the whole season (R 2 = 0.89) and that after anthesis (R 2 = 0.94). It suggested that canopy spectral reflectance has the potential to reveal the spatial information of the RUE APAR , HI and RUE grain . It is hoped that this information will be useful in improving the accuracy of crop yield simulation in large areas.

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Section: Discussionmentioning

confidence: 99%

Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance

Luo

2011

Crop Pasture Sci.

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“…However, in many biomes, plant transpiration dominates ET actual , and is often the major unknown in wide-area water budgets. In arid zone phreatophyte communities, as studied here, plants withdraw water from the underlying aquifer, precipitation is low, and the top meter of soil is often dry [1,7,8]. Bare soil evaporation is often a small term in the water budget of these systems.…”

Section: The Vegetation Index Approach For Scaling Et By Remote Sensingmentioning

confidence: 93%

“…VI methods based on Equations 1 and 2 assume a fixed, or at least a predictable, relationship between green foliage density and plant transpiration on daily or longer time steps under a given set of environmental conditions [1,18]. This is often true for unstressed vegetation such as irrigated crops [19].…”

Section: Potential Problems In Applying VI Methods To Arid Zone Plantmentioning

confidence: 99%

“…Recent studies have combined ground measurements of evapotranspiration (ET), meteorological variables, and vegetation indices (VIs) determined by satellite sensors to project plant water use over diverse biomes, including deserts [1,2], semiarid rangelands [3], agricultural districts [4][5][6], riparian corridors [7,8], rainforests [9], and mixed landscape units at regional [10,11] and global [12,13] scales of measurement. Unlike remote sensing methods based on thermal (NIR) bands on Landsat or other high-resolution satellites, which provide a snap-shot of actual ET (ET actual ) at the time of satellite overpass [14,15], VI methods are useful in projecting ET actual over longer time periods (weeks, months and years), due to the modulated response of VIs to environmental conditions.…”

Section: The Vegetation Index Approach For Scaling Et By Remote Sensingmentioning

confidence: 99%

“…With respect to VI methods, E L was not constant on a daily time step, but varied from 1.66-2.89 mm m ). Hence, an ET actual estimate based on the assumption of a constant relationship between E L and ET o (e.g., [1]) would not accurately project ET actual at any given site. In aggregate, however, ET o F from saltcedar sites plotted against EVI* fell along the same line as alfalfa, arrowweed and cottonwood.…”

Section: Remote Sensing Algorithm For Scaling Et Actualmentioning

confidence: 99%

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An Empirical Algorithm for Estimating Agricultural and Riparian Evapotranspiration Using MODIS Enhanced Vegetation Index and Ground Measurements of ET. I. Description of Method

et al. 2009

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Abstract:We used the Enhanced Vegetation Index (EVI) from MODIS to scale evapotranspiration (ET actual ) over agricultural and riparian areas along the Lower Colorado River in the southwestern US. Ground measurements of ET actual by alfalfa, saltcedar, cottonwood and arrowweed were expressed as fraction of potential (reference crop) ET o (ET o F) then regressed against EVI scaled between bare soil (0) and full vegetation cover (1.0) (EVI*). EVI* values were calculated based on maximum and minimum EVI values from a large set of riparian values in a previous study. A satisfactory relationship was found between crop and riparian plant ET o F and EVI*, with an error or uncertainty of about 20% in the mean estimate (mean ET actual = 6.2 mm d

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How Jordan and Saudi Arabia are avoiding a tragedy of the commons over shared groundwater

Müller

Müller-Itten

Gorelick

2017

Water Resources Research

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Transboundary aquifers are ubiquitous and strategically important to global food and water security. Yet these shared resources are being depleted at an alarming rate. Focusing on the Disi aquifer, a key nonrenewable source of groundwater shared by Jordan and Saudi Arabia, this study develops a two‐stage game that evaluates optimal transboundary strategies of common‐pool resource exploitation under various assumptions. The analysis relies on estimates of agricultural water use from satellite imagery, which were obtained using three independent remote sensing approaches. Drawdown response to pumping is simulated using a 2‐D regional aquifer model. Jordan and Saudi Arabia developed a buffer‐zone strategy with a prescribed minimum distance between each country's pumping centers. We show that by limiting the marginal impact of pumping decisions on the other country's pumping costs, this strategy will likely avoid an impeding tragedy of the commons for at least 60 years. Our analysis underscores the role played by distance between wells and disparities in groundwater exploitation costs on common‐pool overdraft. In effect, if pumping centers are distant enough, a shared aquifer no longer behaves as a common‐pool resource and a tragedy of the commons can be avoided. The 2015 Disi aquifer pumping agreement between Jordan and Saudi Arabia, which in practice relies on a joint technical commission to enforce exclusion zones, is the first agreement of this type between sovereign countries and has a promising potential to avoid conflicts or resolve potential transboundary groundwater disputes over comparable aquifer systems elsewhere.

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Annual groundwater evapotranspiration mapped from single satellite scenes

Cited by 95 publications

References 32 publications

Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance

Radiation-use efficiency and the harvest index of winter wheat at different nitrogen levels and their relationships to canopy spectral reflectance

An Empirical Algorithm for Estimating Agricultural and Riparian Evapotranspiration Using MODIS Enhanced Vegetation Index and Ground Measurements of ET. I. Description of Method

How Jordan and Saudi Arabia are avoiding a tragedy of the commons over shared groundwater

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