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Author: Amrit Kamila
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659164187
Category :
Languages : en
Pages : 100
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Book Description
Evapotranspiration (ET) is an important part in surface energy and water balance. ET is the process where liquid water is converted into water vapor and thus removed from sources such as the soil surface, wet vegetation, pavement, water bodies, etc. Transpiration consists of the vaporization of liquid water within a plant and subsequent loss of water as vapor through leaf stomata. Remote sensing based energy balance models are presently most suited Surface Energy Balance Algorithm for Land (SEBAL), a remote sensing based ET model, was applied to Landsat TM imagery in Bankura district, a tropical region in West Bengal with heterogeneous surface conditions, for the estimation of actual ET. SEBAL model follows an energy balance approach of estimation of ET, when the net radiation, sensible heat flux and soil heat flux are known. Input for SEBAL model includes land surface parameters such as surface temperature, NDVI and albedo.
Author: Amrit Kamila
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659164187
Category :
Languages : en
Pages : 100
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Book Description
Evapotranspiration (ET) is an important part in surface energy and water balance. ET is the process where liquid water is converted into water vapor and thus removed from sources such as the soil surface, wet vegetation, pavement, water bodies, etc. Transpiration consists of the vaporization of liquid water within a plant and subsequent loss of water as vapor through leaf stomata. Remote sensing based energy balance models are presently most suited Surface Energy Balance Algorithm for Land (SEBAL), a remote sensing based ET model, was applied to Landsat TM imagery in Bankura district, a tropical region in West Bengal with heterogeneous surface conditions, for the estimation of actual ET. SEBAL model follows an energy balance approach of estimation of ET, when the net radiation, sensible heat flux and soil heat flux are known. Input for SEBAL model includes land surface parameters such as surface temperature, NDVI and albedo.
Author: Megh R Goyal
Publisher: CRC Press
ISBN: 1926895584
Category : Science
Languages : en
Pages : 630
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Book Description
This book covers topics on the basic models, assessments, and techniques to calculate evapotranspiration (ET) for practical applications in agriculture, forestry, and urban science. This simple and thorough guide provides the information and techniques necessary to develop, manage, interpret, and apply evapotranspiration ET data to practical applications. The simplicity of the contents assists technicians in developing ET data for effective water management.
Author: Pradeep Wagle
Publisher: MDPI
ISBN: 3039216023
Category : Technology & Engineering
Languages : en
Pages : 240
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Book Description
Evapotranspiration (ET) is a critical component of the water and energy balances, and the number of remote sensing-based ET products and estimation methods has increased in recent years. Various aspects of remote sensing of ET are reported in the 11 papers published in this book. The major research areas covered by this book include inter-comparison and performance evaluation of widely used one- and two-source energy balance models, a new dual-source model (Soil Plant Atmosphere and Remote Sensing Evapotranspiration, SPARSE), and a process-based model (ETMonitor); assessment of multi-source (e.g., remote sensing, reanalysis, and land surface model) ET products; development or improvement of data fusion frameworks to predict continuous daily ET at a high spatial resolution (field-scale or 30 m) by fusing the advanced spaceborne thermal emission reflectance radiometer (ASTER), the moderate resolution imaging spectroradiometer (MODIS), and Landsat data; and investigating uncertainties in ET estimates using an ET ensemble composed of several land surface models and diagnostic datasets. The effects of the differences between ET products on water resources and ecosystem management were also investigated. More accurate ET estimates and improved understanding of remotely sensed ET products are crucial for maximizing crop productivity while minimizing water losses and management costs.
Author: Ketema Tilahun Zeleke
Publisher:
ISBN: 9789533078083
Category :
Languages : en
Pages :
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Book Description
Author: Howard Latimer 1909- Penman
Publisher: Hassell Street Press
ISBN: 9781014498106
Category :
Languages : en
Pages : 142
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Book Description
This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Virginia Venturini
Publisher:
ISBN: 9789533078083
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 273
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Book Description
Author: G. W. Kite
Publisher: IWMI
ISBN: 9290904127
Category : Evapotranspiration
Languages : en
Pages : 41
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Book Description
An overview of an experiment in which 8 different methods of estimating actual evaporation and transpiration were compared using a common database. Methods based on field data, hydrological models, and satellite data were used and the objectives were to compare results and to assess the utility of each method for various applications.
Author: Ayse Irmak
Publisher: BoD – Books on Demand
ISBN: 9533078081
Category : Science
Languages : en
Pages : 530
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Book Description
This edition of Evapotranspiration - Remote Sensing and Modeling contains 23 chapters related to the modeling and simulation of evapotranspiration (ET) and remote sensing-based energy balance determination of ET. These areas are at the forefront of technologies that quantify the highly spatial ET from the Earth's surface. The topics describe mechanics of ET simulation from partially vegetated surfaces and stomatal conductance behavior of natural and agricultural ecosystems. Estimation methods that use weather based methods, soil water balance, the Complementary Relationship, the Hargreaves and other temperature-radiation based methods, and Fuzzy-Probabilistic calculations are described. A critical review describes methods used in hydrological models. Applications describe ET patterns in alpine catchments, under water shortage, for irrigated systems, under climate change, and for grasslands and pastures. Remote sensing based approaches include Landsat and MODIS satellite-based energy balance, and the common process models SEBAL, METRIC and S-SEBS. Recommended guidelines for applying operational satellite-based energy balance models and for overcoming common challenges are made.
Author: Charles Scarborough
Publisher:
ISBN:
Category :
Languages : en
Pages : 149
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Book Description
Evapotranspiration (ET) is the combination of transpiration from plants and evaporation from land surface sources of water. Accurate accounting of actual crop ET is critical in agricultural water management, especially in areas with intensive irrigation. Mapping Evapotranspiration at High Resolution with Internalized Calibration (METRIC) is a useful tool to spatially estimate actual evapotranspiration (ETa) using satellite imagery. Although METRIC has been a documented success in estimating ETa in regions around the world, especially the semi-arid regions of the western United States, it has not been applied in the Mid-Atlantic region of the United States or examined under different irrigation regimes like subsurface drip (SDI) and central pivot irrigation (CPI). This study compares cumulative ETa from corn and soybean crops under CPI and SDI crop fields and provides cumulative ETa images of the fields in southern Delaware. METRIC modeled land surface energy balance data and daily ETa (ETMETRIC) were compared to in-situ observations of incoming solar radiation (RS6́3), surface temperature (Ts), net radiation (R℗Ơn), soil heat flux (G), sensible heat flux (H), latent heat flux (LE), Eddy Covariance ETa (ETEC), and atmometer ETa (ETatm). Turbulent fluxes (H and LE) were adjusted to force energy balance closure using the Bowen ratio method. In-situ data measurements were fixed to a Delaware Environmental Observing System (DEOS) station bordering the SDI field in Warrington Farm, a University of Delaware owned irrigation research farm. METRIC analysis and validation were performed over various dates within the 2015, 2016, and 2017 growing seasons. Modeled values of RS6́3, T℗Ơs, G, and LE agreed reasonably well with observations, while Rn and H yielded large biases. Biases in H are in part due to the internal design of METRIC of internal calibration, which absorb all other energy balance biases to yield accurate values of ETa. Daily time series of ETMETRIC from the 2016 study period agreed well with ETEC, indicated by moderate correlation (R2 = 0.63) and low RMSE (0.75 mm day-1). Results from the 2017 study period were unfavorable (R2 = 0.33, RMSE of 1.13 mm day-1). Less than optimal Landsat coverage over the study area contributed to deviations from observations. Cumulative ETMETRIC was 1.5% and 2.9% greater than ETEC for the 2016 and 2017 study periods, respectively. METRIC analysis was able to detect differences in cumulative ETa℗Ơ of corn and soybean under the CPI system and SDI system. Results indicate that METRIC is a useful tool to create spatial estimates of ETa in an agriculturally intensive area of the mid-Atlantic region.
