Within the Ararat Valley (Armenia), a continuously growing water demand (for irrigation and fish farming) and a simultaneous decline in groundwater recharge (due to climate change) result in increasing stress on the local groundwater resources. This detrimental development is reflected by groundwater-level drops and an associated reduction of the area with artesian conditions in the valley centre. This situation calls for increasing efforts aimed at more sustainable water resources management. The aim of this baseline study was the collection of data that allows for study on the origin and age distribution of the Ararat Valley groundwater based on environmental tracers, namely stable (δ2H, δ18O) and radioactive (35S, 3H) isotopes, as well as physical-chemical indicators. The results show that the Ararat Valley receives modern recharge, despite its (semi-)arid climate. While subannual groundwater residence times could be disproved (35S), the detected 3H pattern suggests groundwater ages of several decades, with the oldest waters being recharged around 60 years ago. The differing groundwater ages are reflected by varying scatter of stable isotope and hydrochemical signatures. The presence of young groundwater (i.e., younger that the 1970s), some containing nitrate, indicates groundwater vulnerability and underscores the importance of increased efforts to achieve sustainable management of this natural resource. Since stable isotope signatures indicate the recharge areas to be located in the mountains surrounding the valley, these efforts must not be limited to the central part of the valley where most of the abstraction wells are located.
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排序方式： 共有29条查询结果，搜索用时 15 毫秒
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Schubert Michael Michelsen Nils Schmidt Axel Eichenauer Laura Knoeller Kay Arakelyan Alexander Harutyunyan Lilith Schüth Christoph 《Hydrogeology Journal》2021,29(7):2517-2527
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Modern concepts of the universe support the assumed existence of a nongravitational source, known as dark energy, for which
ε + 3 P < 0 (where ε is the energy density and P is the pressure). This ensures accelerated expansion of the universe. This paper examines a tensor-scalar
variant of the theory of gravitation with a conformally coupled scalar field. Various cosmological models are examined and
the possible evolutionary development of the universe with accelerated expansion is discussed.
Translated from Astrofizika, Vol. 51, No. 4, pp. 653–661 (November 2008). 相似文献
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A broad sample of computed realistic equations of state of superdense matter with a quark phase transition is used to construct a series of models of neutron stars with a strange quark core. The integral characteristics of the stellar configurations are obtained: gravitational mass, rest mass, radius, relativistic moment of inertia, and red shift from the star's surface, as well as the mass and radius of the quark core within the allowable range of values for the central pressure. The parameters of some of the characteristic configurations of the calculated series are also given and these are studied in detail. It is found that a new additional region of stability for neutron stars with strange quark cores may exist for some models of the equation of state. 相似文献
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H. A. Harutyunyan 《Astrophysics》2009,52(3):307-321
Ambartsumian’s paradigm for the creation of galaxies owing to the decay of denser matter is examined. The roots of this concept
can be found in the very earliest papers of Ambartsumian on quantum fields and the structure of atomic nuclei. In the early
1930’s his papers contained new ideas regarding the ejection by one physical object of another which had not originally existed
inside the first. The basic observational data which served as the basis for the final formulation of the new concept are
described. Special attention is devoted to those objects and phenomena, which, upon further study, have confirmed the validity
of Ambartsumian’s reasoning and arguments. It is noted that the discovery of Hubble expansion’s acceleration of the universe
opened up new possibilities for the interpretation of activity phenomena in terms of Ambartsumian’s concept. The further extension
of this concept is discussed and it is suggested that the major result of this approach should be the proof of the existence
of galaxies of all ages within a finite volume of space. 相似文献
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A variant of the Jordan-Brans-Dicke (JBD) theory is examined which contains a cosmological scalar that is written so that on going to the Einstein representation it becomes the ordinary cosmological constant of general relativity theory. This paper is divided into two parts. In Part I we examine the cosmological solutions for the Einstein representation of the JBD theory, i.e., in the presence of a minimally coupled scalar field. In Part II we shall study the cosmological solutions in the proper representation of the JBD theory with a self consistent scalar field. The analysis of these solutions is of interest in connection with modern concepts of the evolution of the universe, in particular, with the observed acceleration of cosmological expansion and estimates of the density of dark matter and dark energy.__________Translated from Astrofizika, Vol. 48, No. 3, pp. 455–462 (August 2005). 相似文献
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