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Journal ArticleDOI

Estimation of evapotranspiration in lesser Himalayas using remote sensing based surface energy balance algorithm

TL;DR: In this article, a remote sensing-based algorithm, METRIC is used to estimate evapotranspiration (ET) over a mountainous watershed in the lesser Himalayas in Uttarakhand, India.
Abstract: In this study, remote sensing-based algorithm, METRIC is used to estimate evapotranspiration (ET) over a mountainous watershed in the lesser Himalayas in Uttarakhand, India. ET estimates of METRIC ...
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01 Jan 2008
Abstract: This paper reviews methods for estimating evaporation from landscapes, regions and larger geographic extents, with remotely sensed surface temperatures, and highlights uncertainties and limitations associated with those estimation methods. Particular attention is given to the validation of such approaches against ground based flux measurements. An assessment of some 30 published validations shows an average root mean squared error value of about 50 W m−2 and relative errors of 15–30%. The comparison also shows that more complex physical and analytical methods are not necessarily more accurate than empirical and statistical approaches. While some of the methods were developed for specific land covers (e.g. irrigation areas only) we also review methods developed for other disciplines, such as hydrology and meteorology, where continuous estimates in space and in time are needed, thereby focusing on physical and analytical methods as empirical methods are usually limited by in situ training data. This review also provides a discussion of temporal and spatial scaling issues associated with the use of thermal remote sensing for estimating evaporation. Improved temporal scaling procedures are required to extrapolate instantaneous estimates to daily and longer time periods and gap-filling procedures are needed when temporal scaling is affected by intermittent satellite coverage. It is also noted that analysis of multi-resolution data from different satellite/sensor systems (i.e. data fusion) will assist in the development of spatial scaling and aggregation approaches, and that several biological processes need to be better characterized in many current land surface models.

51 citations

Journal ArticleDOI
TL;DR: In this paper , the authors proposed three annual smart groundwater market mechanisms to maximize water net benefits, minimize groundwater withdrawal, and precisely measure water consumption in agricultural fields, and evaluated their efficiency in recovering approximately 80% (23.33 million cubic meters) of groundwater loss due to overexploitation in the study area.
Journal ArticleDOI
TL;DR: Based on MODIS remote sensing data and combined with meteorological and hydrological data, the PT-JPL model was used to estimate the actual evapotranspiration of the Yiluo River Basin this paper .
Abstract: Evapotranspiration is an important part of the hydrological cycle, affecting the terrestrial hydrological process and the relationship between water resource transformation. Analyzing and mastering the temporal and spatial variations in evapotranspiration are of great significance for the rational development, utilization, and protection of water resources in the basin. Based on MODIS remote sensing data and combined with meteorological and hydrological data, the PT-JPL model was used to estimate the actual evapotranspiration of the Yiluo River Basin, and the applicability of the PT-JPL model for estimating actual evapotranspiration in the basin was analyzed. The spatial and temporal characteristics of actual evapotranspiration in the Yiluo River Basin were analyzed, and the correlation between actual evapotranspiration in the basin and influencing factors such as precipitation, temperature, and vegetation was explored. The main conclusions are as follows: the PT-JPL model has good applicability in the Yiluo River Basin; the total actual evapotranspiration in the basin showed a decreasing trend, which was consistent with the trend of precipitation, indicating that the actual evapotranspiration may be limited by water conditions in the study area. The evapotranspiration of the basin was higher in the upstream and lower in the downstream, which may be related to the better vegetation coverage in the upper basin than in the downstream. As an important indicator of vegetation change, NDVI showed a good correlation with evapotranspiration, which also verified this. In addition, the correlation between evapotranspiration and temperature was also good.
References
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Journal ArticleDOI
TL;DR: In this paper, an equation is presented that estimates ETo from measured values of daily or mean values of maximum and minimum temperature. But this equation is compared with various other methods for estimating ETo.
Abstract: MEASURED lysimeter evapotranspiration of Alta fescue grass (a cool season grass) is taken as an index of reference crop evapotranspiration (ETo). An equation is presented that estimates ETo from measured values of daily or mean values of maximum and minimum temperature. This equation is compared with various other methods for estimating ETo. The equation was developed using eight years of daily lysimeter data from Davis, California and used to estimate values of ETo for other locations. Comparisons with other methods with measured cool season grass evapotranspiration at Aspendale, Australia; Lompoc, California; and Seabrook, New Jersey; with lysimeter data from Damin, Haiti; and with the modified Penman for various locations in Bangladesh indicated that the method usually does not require local calibration and that the estimated values are probably as reliable and useable as those from the other estimating methods used for comparison. Considering the scarcity of complete and reliable climatic data for estimating crop water requirements in developing countries, this proposed method can do much to improve irrigation planning design and scheduling in the developing countries.

3,252 citations


"Estimation of evapotranspiration in..." refers background in this paper

  • ...The most commonly CONTACT Hitesh Upreti hitsh.upreti@gmail.com 2020 Informa UK Limited, trading as Taylor & Francis Group used ET estimation equations are Food and Agriculture Organization of the United Nations (FAO) Penman-Monteith (Allen et al. 1998), FAO-24 Penman (Penman 1963; Doorenbos and Pruitt 1977), Hargreaves-Samani (Hargreaves and Samani 1982, 1985), Blanley-Criddle (Blaney and Criddle 1950) and FAO pan evaporation (Allen et al. 1998)....

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  • ...…are Food and Agriculture Organization of the United Nations (FAO) Penman-Monteith (Allen et al. 1998), FAO-24 Penman (Penman 1963; Doorenbos and Pruitt 1977), Hargreaves-Samani (Hargreaves and Samani 1982, 1985), Blanley-Criddle (Blaney and Criddle 1950) and FAO pan evaporation (Allen et al. 1998)....

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Journal ArticleDOI
TL;DR: The Surface Energy Balance Algorithm for Land (SEBAL) as mentioned in this paper estimates the spatial variation of most essential hydro-meteorological parameters empirically, and requires only field information on short wave atmospheric transmittance, surface temperature and vegetation height.

2,628 citations


"Estimation of evapotranspiration in..." refers methods in this paper

  • ...The detailed theoretical and mathematical description of the SEBAL model can be found in Bastiaanssen et al. (1998a, 1998b, 2005)....

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  • ...SEBAL (Surface Energy Balance Algorithm for Land) is one such energy balance algorithm that was developed in The Netherlands (Bastiaanssen 1995; Bastiaanssen et al. 1998a, 1998b) and has been applied worldwide (Bastiaanssen 2000, Bastiaanssen et al. 2005)....

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01 Jan 1977
TL;DR: Guidelines for predicting crop water requirements as mentioned in this paper, which are based on guidelines for predicting water requirements, are used to predict water requirements in the field of crop water forecasting, and they can be found in Table 1.
Abstract: Guidelines for predicting crop water requirements , Guidelines for predicting crop water requirements , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

2,098 citations

Book
01 Jan 1977
TL;DR: Guidelines for predicting crop water requirements as discussed by the authors, which are based on guidelines for predicting water requirements, are used to predict water requirements in the field of crop water forecasting, and they can be found in Table 1.
Abstract: Guidelines for predicting crop water requirements , Guidelines for predicting crop water requirements , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

1,780 citations


"Estimation of evapotranspiration in..." refers background in this paper

  • ...…equations are Food and Agriculture Organization of the United Nations (FAO) Penman-Monteith (Allen et al. 1998), FAO-24 Penman (Penman 1963; Doorenbos and Pruitt 1977), Hargreaves-Samani (Hargreaves and Samani 1982, 1985), Blanley-Criddle (Blaney and Criddle 1950) and FAO pan evaporation…...

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Journal ArticleDOI
TL;DR: METRIC uses as its foundation the pioneering SEBAL energy balance process developed in The Netherlands by Bastiaanssen, where the near-surface temperature gradients are an indexed function of radiometric surface temperature, thereby eliminating the need for absolutely accurate surface temperature and theneed for air-temperature measurements.
Abstract: Mapping evapotranspiration at high resolution with internalized calibration (METRIC) is a satellite-based image-processing model for calculating evapotranspiration (ET) as a residual of the surface energy balance. METRIC uses as its foundation the pioneering SEBAL energy balance process developed in The Netherlands by Bastiaanssen, where the near-surface temperature gradients are an indexed function of radiometric surface temperature, thereby eliminating the need for absolutely accurate surface temperature and the need for air-temperature measurements. The surface energy balance is internally calibrated using ground-based reference ET to reduce computational biases inherent to remote sensing-based energy balance and to provide congruency with traditional methods for ET. Slope and aspect functions and temperature lapsing are used in applications in mountainous terrain. METRIC algorithms are designed for relatively routine application by trained engineers and other technical professionals who possess a fami...

1,570 citations


"Estimation of evapotranspiration in..." refers background or methods in this paper

  • ...The accuracy of METRIC model in estimating ET very much depends on the two extreme pixels, hot and cold pixels which are used for the pixel-wise estimation of sensible heat (Allen et al. 2007)....

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  • ...METRIC (Mapping EvapoTranspiration at high Resolution with Internalized Calibration) algorithm was introduced by Allen et al. (2007) that uses the basic principles of SEBAL with certain variations....

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  • ...05 times of ETr where ETr is hourly reference ET for alfalfa (Allen et al. 2007)....

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  • ...Cold pixel represents well-irrigated cropped surface and ET at cold pixel is assumed as 1.05 times of ETr where ETr is hourly reference ET for alfalfa (Allen et al. 2007)....

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