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Author: H. E. Thomas
Publisher:
ISBN:
Category : Evapotranspiration
Languages : en
Pages : 38
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Author: H. E. Thomas
Publisher:
ISBN:
Category : Evapotranspiration
Languages : en
Pages : 38
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Author:
Publisher:
ISBN:
Category : Irrigation
Languages : en
Pages : 294
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Author: Ronald Lee Hanson
Publisher:
ISBN:
Category : Evapotranspiration
Languages : en
Pages : 48
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 780
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Author: Lawrence K. Wang
Publisher: Springer Science & Business Media
ISBN: 1461248221
Category : Technology & Engineering
Languages : en
Pages : 512
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Book Description
The past few years have seen the emergence of a growing, widespread desire in this country, and indeed everywhere, that positive actions be taken to restore the quality of our environment, and to protect it from the degrading effects of all forms of pollution-air, noise, solid waste, and water. Since pollution is a direct or indirect consequence of waste, if there is no waste, there can be no pollution, and the seemingly idealistic demand for "zero discharge" can be construed as a demand for zero waste. However, as long as there is waste, we can only attempt to abate the consequent pollution by converting it to a less noxious form. In those instances in which a particular type of pollution has been recognized, three major questions usually arise: (1) How serious is the pollution? (2) Is the technology to abate it available? and (3) Do the costs of abatement justify the degree of abatement achieved? The principal intention of this series of books on environmental engineering is to help the reader formu late useful answers to the second and third of these questions, i. e. , to outline the best currently available engineering solutions, and to examine their costs in the light of the real level of benefits afforded.
Author: Rita L. Carman
Publisher:
ISBN:
Category : Evaporation (Meteorology)
Languages : en
Pages : 30
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Author: Gulomjon Umirzakov
Publisher: Cuvillier Verlag
ISBN: 3736982240
Category : Science
Languages : en
Pages : 144
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Agriculture in Uzbekistan critically depends on water resources availability, therefore crop production, especially of cotton and winter wheat, is restricted mainly to irrigated areas. As a result of water shortage under climate change, land degradation issues in the region worsened and water use efficiency has considerably decreased over the decades. Hence, it is essential to investigate water balance parameters in irrigated lands. Environmental isotopes have been widely applied in hydrological investigations, particularly estimation of evapotranspiration rate, one of the main components of the water balance in irrigated lands. This study aims to estimate evapotranspiration rates in cotton fields by applying water stable isotopes (2H and 18O). The study is based on the field experiments conducted during the vegetation periods 2010 and 2011 in the Fergana Region of Uzbekistan. Soil for isotope analysis were sampled in a sandy field, sandy loam #1 field (rich with gypsum) and sandy loam #2 field (without gypsum). The soil water from the samples was extracted by the cryogenic extraction method. δ2H and δ18O ratios of extracted water were determined using the laser spectroscopy method. Evapotranspiration rates were estimated with the isotope mass balance model. Besides evapotranspiration estimation, this study examines the variability and characteristics of stable isotope signatures of different water sources in the study region and analyzes water extraction processes from different soil types and temporal changes of isotope signatures through the depth in irrigated cotton fields.
Author: Cornelius H. M. Van Bavel
Publisher:
ISBN:
Category : Evapotranspiration
Languages : en
Pages : 32
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 378
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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 380
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