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Javier Fernández de Córdova Juan Antonio Pascual Aguilar 《Environmental Earth Sciences》2014,71(1):53-60
In this study, the excess water generated during a 10-year period (1998–2008) in the upper and middle Yanuncay River basins is estimated. The distributed water balance method, which analyses the interaction between all the different parameters that form part of the water cycle in nature, was developed. To create the model, basic parameters such as rainfall, temperature, soil type and surface cover are required. Moreover, by using computer software such as Microsoft Office Excel and geographic information systems, it is possible to obtain monthly data showing the water excess and generate thematic maps which allow for an effective monitoring of the behaviour of the middle and upper Yanuncay River basins. This study takes the spatial variability of the various factors that influence the behaviour of a basin into account. This allows determining zones with greater water excess, which are areas that would need to be protected. The model can easily incorporate new data such as land use and surface cover (based on time frames) which would facilitate the comparison of different scenarios. 相似文献
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Lead isotope study has been performed on massive sulphide deposits of Ossa-Morena and Aracena Belt (South Iberia). Results suggest the existence of at least two ancient hydrothermal events. The first one, Upper Brioverian in age (～600–570 Ma), gave birth to Maria-Luisa and Puebla de la Reina massive sulphide deposits; it thus confirms the existence of a Cadomian orogen in South Iberia. Isotopic compositions indicate a local contribution of mantle-derived material (Maria Luisa mine), confirming the presence of ancient oceanic crust in Aracena Belt. This mineralising event seems to extend till the Armorican Massif. The second episode, Eo-Hercynian in age (～400–350 Ma) has allowed genesis of massive sulphide deposits of la Nava Paredon and Aguas Blancas, and could be coeval with the emplacement of South-Iberian massive sulphide ore deposits in the neighbouring South-Portuguese Zone. A more continental crustal source for later ore deposits could explain the much more important metal accumulation in this zone. To cite this article: É. Marcoux et al., C. R. Geoscience 334 (2002) 259–265. 相似文献
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Ohne Zusammenfassung
En hommage pour le 70 anniversaire du Professeur Dr.C. W. Correns, les auteurs dedient ce travail, en remerciant l’enseignement qu’ils ont re?u pendant leur séjour au Sedimentpetrographisches
Institut de G?ttingen (1952 et 1955). 相似文献
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R. Gutiérrez R. Gutiérrez-Sánchez A. Nafidi A. Pascual 《Stochastic Environmental Research and Risk Assessment (SERRA)》2012,26(4):533-543
This paper proposes a new stochastic model, based on a Vasicek non-homogeneous diffusion process, in which the non-linear
trend coefficient (drift) depends on deterministic functions that describe the dynamic evolution of certain exogenous variables.
After studying its probabilistic characteristics, and in particular the transition probability density and trend function,
the associated stochastic inference based on discrete sampling in time is established using maximum likelihood methodology.
This model is applied to detect, estimate and model the non-linear trend present in data corresponding to CO2 emissions in Morocco. Energy and financial variables that affect the behaviour of this trend are also detected, and substantial
improvement provided by this non-homogeneous model with respect to its corresponding homogeneous version, is confirmed. 相似文献
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Simulation models have been widely adopted in fisheries for management strategy evaluation (MSE). However, in catchment management of water quality, MSE is hampered by the complexity of both decision space and the hydrological process models. Empirical models based on monitoring data provide a feasible alternative to process models; they run much faster and, by conditioning on data, they can simulate realistic responses to management actions. Using 10 years of water quality indicators from Queensland, Australia, we built an empirical model suitable for rapid MSE that reproduces the water quality variables' mean and covariance structure, adjusts the expected indicators through local management effects, and propagates effects downstream by capturing inter-site regression relationships. Empirical models enable managers to search the space of possible strategies using rapid assessment. They provide not only realistic responses in water quality indicators but also variability in those indicators, allowing managers to assess strategies in an uncertain world. 相似文献
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Salat Jordi Pascual Josep Flexas Mar Chin Toshio Michael Vazquez-Cuervo Jorge 《Ocean Dynamics》2019,69(9):1067-1084
Ocean Dynamics - Marine and atmospheric parameters, including temperature observations from surface to 80 m (at 6 depths) are measured since September 1973 on a higher-than-weekly... 相似文献
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