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| Registros recuperados: 42 | |
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| Campos,José N.B.; Lima Neto,Iran E.; Studart,Ticiana M.C.; Nascimento,Luiz S.V.. |
| This study investigates the relationships between yield and evaporation as a function of lake morphology in semi-arid Brazil. First, a new methodology was proposed to classify the morphology of 40 reservoirs in the Ceará State, with storage capacities ranging from approximately 5 to 4500 hm3. Then, Monte Carlo simulations were conducted to study the effect of reservoir morphology (including real and simplified conical forms) on the water storage process at different reliability levels. The reservoirs were categorized as convex (60.0%), slightly convex (27.5%) or linear (12.5%). When the conical approximation was used instead of the real lake form, a trade-off occurred between reservoir yield and evaporation losses, with different trends for the convex,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Evaporation losses; Hydrological modeling; Lake morphology; Reservoir yield; Semi-arid regions; Water availability. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301113 |
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| González-Paleo,Luciana; Pastor-Pastor,Alejandro; Bar Lamas,Marlene; Vilela,Alejandra; Ravetta,Damián. |
| Seedling recruitment is a critical stage of a plant's cycle which determines population viability, the potential for invasiveness of a plant species and the success of establishment of a crop, among other processes. We evaluated the most relevant stages leading to recruitment (seed-rain, the time of seedling emergence, and seedling survival) in four species of Physaria (P. gracilis, P. angustifolia, Physaria pinetorum and P. mendocina) in a field experiment in Patagonia, Argentina, to assess the possibility of using spontaneous recruitment to understand population dynamics and to evaluate the potential of this process as a tool for crop reestablishment. We determined the effect of water availability and initial seedling density on final stand density. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lesquerella; Arid environments; Seed-rain; Seedling survival; Seedling density; Water availability. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2016000300012 |
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| Cabello, Violeta; Department of Human Geography, University of Seville; vcabellov@gmail.com; Willaarts, Barbara A.; Research Centre for the Management of Agricultural and Environmental Risks - CEIGRAM, Technical University of Madrid.; barbara.willaarts@upm.es; Aguilar, Monica; Department of Physical Geography, University of Seville; malba@us.es; del Moral Ituarte, Leandro; Department of Human Geography, University of Seville; lmoral@us.es. |
| River basin modeling under complexity requires analytical frameworks capable of dealing with the multiple scales and dimensions of environmental problems as well as uncertainty in the evolution of social systems. Conceptual and methodological developments can now be framed using the wide socio-eco-hydrological approach. We add hierarchy theory into the mix to discuss the conceptualization of river basins as complex, holarchic social-ecological systems. We operationalize the social-ecological systems water metabolism framework in a semiarid watershed in Spain, and add the governance dimension that shapes human-environment reciprocity. To this purpose, we integrate an eco-hydrological model with the societal metabolism accounting scheme for land use, human... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Holarchy; River basin; Socio-eco-hydrology; Social-ecological systems; Water availability; Water metabolism. |
| Ano: 2015 |
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| Meus,Lorenzo D.; Muttoni,Martina; Bartz,Alex C.; Kaminski,Tiago A.; Alberto,Cleber M.. |
| ABSTRACT The objective of this study is to analyze the classification of rice grains of lowland cultivars grown under flood and sprinkler irrigation. The study was carried out in the agricultural years 2011/2012 and 2014/2015 using a completely randomized block design with split plots. In 2011/2012, the treatments were three lowland rice cultivars grown under flood irrigation system and five sprinkler irrigation depths with four replications. In 2014/2015, the experimental design was maintained but flood irrigation was not performed. After harvest, the samples were processed in a rice testing machine, including peeling, polishing and classification. Whole and broken grains were weighed to calculate hulling and milling yield. The classifications followed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Water availability; Grain quality; Productivity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400599 |
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| Araujo,Fernanda C.; Mello,Eloy L. de; Gollin,Gisele M.; Quadros,Luciana E. de; Gomes,Benedito M.. |
| ABSTRACT The objective of this study was to regionalize 7-day 10-year low flows, long-term annual mean, and 90% and 95% permanence flows from Piquiri (PR) river basin. The following regionalization methods were adopted: Traditional, Linear interpolation, Chaves, Modified linear interpolation, and Modified Chaves. The equations obtained by the Traditional method, adding main river length or drainage density as independent variables, significantly improved R2 equations value. Streamflow forecasting by Linear Interpolation and Chaves methods were as good as those provided by the Traditional Method, thus, these methods could be applied to Piquiri River basin, especially when drainage area is the only available spatial information. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water availability; Water resources management; Average streamflow; Low flows; Flows permanence. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000100022 |
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| Pruski,Fernando F.; Rodriguez,Renata Del G.; Nunes,Aline A.; Pruski,Pedro L.; Singh,Vijay P.. |
| ABSTRACT Knowledge of natural water availability, which is characterized by low flows, is essential for planning and management of water resources. One of the most widely used hydrological techniques to determine streamflow is regionalization, but the extrapolation of regionalization equations beyond the limits of sample data is not recommended. This paper proposes a new method for reducing overestimation errors associated with the extrapolation of regionalization equations for low flows. The method is based on the use of a threshold value for the maximum specific low flow discharge estimated at the gauging sites that are used in the regionalization. When a specific low flow, which has been estimated using the regionalization equation, exceeds the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water availability; Planning and management of water resources; Water safety. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000500808 |
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| Santos,Osvaldir F; Lima,Sebastião F; Piati,Gabriel Luiz; Barzotto,Gustavo R; Gava,Ricardo. |
| ABSTRACT Reduction of leaf area significantly affects maize productivity, due to its low plasticity. Thus, appropriate water application can minimize this problem, considering that under favorable water conditions the plant would express its maximum production potential. The aim of this study was to evaluate the influence of irrigation on the productive performance of sweet corn submitted to different defoliation levels at the beginning of crop cycle. The experimental design was a randomized block design, arranged in split plot scheme; plots consisting of four water depths [50, 75, 100 and 125% of crop evapotranspiration (ETc)] and the subplots consisted of three defoliation levels [0% (control); 35% (removal of four fully expanded leaves), 100% (total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Water availability; Leaf area; Grain yield. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000300341 |
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| Registros recuperados: 42 | |
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