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Registros recuperados: 152
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18O studies on recharge of phreatic aquifers and groundwater flow-paths of mixing in the Delhi area Eprints@IARI
Datta, P.S.; Bhattacharya, S.K.; Tyagi, S.K..
Widespread decline in the groundwater level and growth of salinization are the critical factors controlling future groundwater quality and availability in the Delhi area. S180 and salinity data have been integrated for studying recharge conditions of phreatic aquifers and tracing the flowpaths of groundwater mixing. Wide range (-2.8%0 to -8.6%) and spatial inhomogeneity of 6180 in groundwater indicate that the aquifer is characterized by a slow process of natural mixing of groundwater in its lateral extent. There is infiltration of river water to the groundwater, in addition to the recharge from rainfall. Groundwater recharge in the area also occurs through stagnant water pools in low elevation areas where water surface run-off collects. Chloride...
Tipo: Article Palavras-chave: Hydrology.
Ano: 1996 URL: http://eprints.iari.res.in/298/1/PSD_Paper_GW_Mixing_Flow_Paths.pdf
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A model of the general circulation in the Persian Gulf and in the Strait of Hormuz: Intraseasonal to interannual variability ArchiMer
Pous, Stephane; Lazure, Pascal; Carton, Xavier.
Previous studies modeling the circulation and thermohaline structure in the Persian Gulf have suggested that interannual variability and vertical mixing processes could explain the model biases when compared to the few observations available. Here, a realistic, interannual, high-resolution model of the Persian Gulf is presented, validated against observations and then used to describe the intraseasonal to interannual variability in the circulation, water mass formation and exchange through the Strait of Hormuz. Sensitivity experiments to model settings, in particular vertical mixing parameterizations, have been performed in order to have the best comparison with all available observations. Main circulation and water mass characteristics correspond well to...
Tipo: Text Palavras-chave: Persian Gulf; Strait of Hormuz; Numerical model; Hydrology; Currents; Interannual variability.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00244/35563/35324.pdf
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A new scheme for large-scale natural water storage in the floodplains: the Delhi Yamuna floodplains as a case study Eprints@IARI
Soni, Vikram; Gosain, A.K.; Datta, P.S.; Singh, Diwan.
The top layer of accumulated sand washed down by floods over millions of years, makes river floodplains into giant aquifers. We propose a scheme for the natural storage of excess monsoon river-water discharge in the extensive and deep sand top layer of the floodplain of the river. The excess monsoon discharge can be used for a regulated inundation of an embanked area of the floodplain – to soak in and store the water. This storage can then be used for the withdrawal of water during the dry months. We illustrate this by an evaluation of the potential of the Yamuna floodplains in the National Capital Territory of Delhi and show that there can be an annual yield of 600–900 MCM of water, which is three-fourths the total water supply to Delhi. This makes it an...
Tipo: Article Palavras-chave: Agricultural Engineering; Hydrology; Water Resource Engineering; Agricutlural Economics.
Ano: 2009 URL: http://eprints.iari.res.in/302/1/Yamuna_FP_Paper.pdf
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Analysis of salinity measurements near islands on the French continental shelf of the Bay of Biscay ArchiMer
Lazure, Pascal; Jegou, Anne-marie; Kerdreux, Michel.
The Bay of Biscay is characterised by large fresh water inputs from two major rivers, the Loire and the Gironde, with a mean discharge of about 900 m(3)/s. To describe the spatial and temporal variability of the Loire and Gironde plumes, continuous salinity measurements were made at 4 locations on French coastal islands over periods lasting at least two years. These islands are located at a distance from the large local gradients linked to local inputs. Whereas sea surface salinity in the centre of the Bay of Biscay is 35.6, salinities at the coast vary between about 35 in summer to occasionally less than 30 in late winter or in spring. Minimum salinities do not occur at the same time along the coast, indicating a strong spatial gradient. Near the Loire...
Tipo: Text Palavras-chave: Bay of Biscay; Continental shelf; River plume; Seasonal variability; Salinity; Hydrology.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3957.pdf
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Antarctic bottom water flow through the Vema fracture zone ArchiMer
Vangriesheim, Annick.
During the October-November 1977 R/V "Jean Charcot" cruise, bathymetric and hydrological surveys of the Eastern Vema Fracture Zone were carried out in order to moor current meters on the silliocated in the area, with the aim of evaluating the bottom water flow through this passage in the Mid-Atlantic Ridge. The sill zone in fact comprises a succession of three secondary sills situated between 40052'W and 41°02'W at about 10048'N, at depths ranging from 4600 to 4700 m. Westward of the sills, there is a thick (750-950 m) bottom water layer of Antarctic origin. The potential temperature found at the bottom is 1. 30°C. In the sill zone, the homogeneous layer is thinner and has a potential temperature of 1.40°C. Eastward of the sills, the homogeneous layer is...
Tipo: Text Palavras-chave: Hydrologie; Courants profonds; Eau de fond antartique; Zone de fracture Vema; Hydrology; Bottom currents; Antarctic bottom water; Vema fracture zone.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/00323/43425/43092.pdf
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Anthropogenic impacts on the sediment flux in two alpine watersheds of the Lesser Himalayas Eprints@IARI
Singh, Omvir; Singh, Pratap; Sarangi, Arjamadutta; Sharma, M C; Kumar, Sanjeev.
Water erosion caused by accelerated anthropogenic activities has been perceived as the major source of sediment flow in Himalayan catchments. Keeping this in view, the sediment flux data measured at the outlet of the Sainj and the Tirthan watersheds in the Lesser Himalayan region was analysed. Rainfall behaviour coupled with existing forest cover, snow bound and glaciated areas with rocky outcrops in the Sainj watershed could result in more sediment yields as compared to the Tirthan. It was observed that the sediment flux from the Sainj watershed was 1.5 times more than the Tirthan watershed. Also, the sediment transport from both watersheds showed an increasing trend in the monthly, seasonal and annual flux during the study period (1981–2004). This...
Tipo: Article Palavras-chave: Hydrology; Ecosystem.
Ano: 2010 URL: http://eprints.iari.res.in/239/1/Current_Science.pdf
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Anthropogenic impacts on the sediment flux in two alpine watersheds of the Lesser Himalayas Eprints@IARI
Singh, Omvir; Singh, P; Sarangi, A; Sharma, M.C.; Kumar, Sanjeev.
Water erosion caused by accelerated anthropogenic activities has been perceived as the major source of sediment flow in Himalayan catchments. Keeping this in view, the sediment flux data measured at the outlet of the Sainj and the Tirthan watersheds in the Lesser Himalayan region was analysed. Rainfall behaviour coupled with existing forest cover, snow bound and glaciated areas with rocky outcrops in the Sainj watershed could result in more sediment yields as compared to the Tirthan. It was observed that the sediment flux from the Sainj watershed was 1.5 times more than the Tirthan watershed. Also, the sediment transport from both watersheds showed an increasing trend in the monthly, seasonal and annual flux during the study period (1981–2004). This...
Tipo: Article Palavras-chave: Hydrology; Ecosystem; Environmental Sciences.
Ano: 2010 URL: http://eprints.iari.res.in/256/1/Current_Science.pdf
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Atlas hydrologique des eaux superficielles de la Baie du Lévrier OceanDocs
Ould Dedah, S.; Dobrovine, B..
Le CNROP dispose d’une base de données hydrologiques côtières alimentée par des prélèvements aux différentes stations côtières du centre, ou durant les campagnes océanographiques ou encore par les contrôleurs embarqués à bord des navires de pêche. C’est de cette base que sont extraites en majorité, les données qui ont servi à l’élaboration de cet atlas. Le document présente, à partir de 10750 relevés de températures et de salinités de surface, les répartitions horizontales des moyennes mensuelles et annuelles de quelques caractéristiques du régime hydrologique des eaux superficielles de la baie du Lévrier.
Tipo: Journal Contribution Palavras-chave: Diagramme T-S; Normes mensuelles de température; Eaux superficielles; Amplitude saisonnière de salinité; Moyennes mensuelles de salinité; Amplitude saisonnière de température; Mauritanie; Moyennes mensuelles de température; Température moyenne annuelle; Baie du Lévrier; Normes mensuelles de salinité; Salinité moyenne annuelle; Hydrology.
Ano: 1992 URL: http://hdl.handle.net/1834/516
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Atlas hydrologique des eaux superficielles du Banc d'Arguin OceanDocs
Ould Mahfoudh, M.; Dobrovine, B.; Ould Dedah, S..
Atlass hydrologique publié comme bulletin spécial
Tipo: Journal Contribution Palavras-chave: Hydrology; Oceanographic atlases.
Ano: 1991 URL: http://hdl.handle.net/1834/518
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Atlas Hydrologique des eaux superficielles du plateau continental mauritanien OceanDocs
Dobrovine, B.; Mahfoudh, M.; Ould Dedah, S..
Ce volume du Bulletin Scientifique est entièrement consacré à l'atlas hydrologique des eaux superficielles du plateau continental mauritanien
Tipo: Journal Contribution Palavras-chave: Eaux de surface; Interannual variability; Amplitude saisonnière; Waters surface; Evolution saisonnière; Ecarts de température; Moyenne mensuelle; Moyenne saisonnière; Continental shelf; Mauritanie; Températures; Variations in temperature; Temperatures; Plateu continental; Mean seasonal range of temperature; Variabilité interannuelle; Mean Annual temperatures; Mauritania; Seasonal evolution; Températures moyennes annuelles; Oceanographic atlases; Hydrology.
Ano: 1990 URL: http://hdl.handle.net/1834/766
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Atualização e ajustes da rede de drenagem da bacia do rio Apa/MS utilizando sensoriamento remoto o geoprocessamento. Repositório Alice
SENTURIÃO, A. C. O.; ESQUERDO, J. C. D. M..
Resumo: No âmbito do Projeto GeoMS, executado pela Embrapa Informática Agropecuária em parceria com o Instituto de Meio Ambiente do Mato Grosso do Sul - Imasul, foram gerados e atualizados mapas georreferenciados de informações de recursos naturais daquele estado, incluindo sua rede de drenagem. Este artigo apresenta a metodologia utilizada para a correção e atualização da malha digital hidrográfica da sub-bacia do Rio Apa, no sudoeste do estado do Mato Grosso do Sul, na escala de 1:100.000, tomando-se como base cartográfica imagens georreferencidas de média resolução espacial CCD/CBERS-2B do ano de 2007 e informações das cartas topográficas elaboradas pela Diretoria de Serviço Geográfico - DSG, do Exército Brasileiro. Como resultado obteve-se o mapa...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Sensoriamento remoto; Geoprocessamento; Hidrografia; Mapeamento; CBERS; Geotecnologias; Remote sensing; Hydrology.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/940499
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Bibliografia de recursos naturais da Amazônia brasileira. Infoteca-e
LOPES, A. de S. A.; VAZ PEREIRA, I. C..
1984
Tipo: Livro técnico (INFOTECA-E) Palavras-chave: Recurso natural; Climatologia; Meteorologia; Ecossistema; Hidrografia; Hidrologia; Limnologia; Navegação; Pesca; Solo; Recurso energético; Amazônia; Natural resource; Climatology; Meteorology; Ecosystem; Hydrography; Hydrology; Fishery; Soil; Energetic resource; Navigation.
Ano: 1984 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/373224
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Captação e armazenamento de água de chuva no semi-árido do Nordeste do Brasil. Repositório Alice
LOPES, P. R. C.; SILVA, M.S.L. da; ANJOS, J. B. dos; GOMES, T.C. de A..
2002
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Agricultura; Sequeiro; Pequeno produtor; Hidrologia; Infra-estrutura; Solo; Água; Manejo; Rainfed agriculture; Small farmers; Hydrology; Infrastructure; Soils; Water; Management; Recurso natural.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/129165
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Características fisico-químicas de la Bahía de Santa Marta (Agosto 1980 - Julio 1981) OceanDocs
Ramírez-T., G..
Se estudiaron las condiciones fisicoquímicas de la Bahía de Santa Marta, Litoral Caribe colombiano, desde agosto de 1980 hasta julio 1981. La similitud de los resultados obtenidos en nueve estaciones indican que las aguas superficiales son homogéneas y de características oceánicas. De diciembre a abril se registran las temperaturas más bajas (< 25°C) asociadas a altas salinidades (>36o/oo) y subsaturaciones de oxígeno disuelto (< 91o/o): estos factores, conjuntamente con observaciones de pH, alcalinidad y la variación de la estabilidad de la columna de agua evidencian procesos de surgencia en este período, permitiendo establecer un modelo aproximado para el ciclo anual de la bahía.
Tipo: Journal Contribution Palavras-chave: Physical oceanography; Chemical oceanography; Hydrology; Physical oceanography; Hydrology; Chemical oceanography; Http://aims.fao.org/aos/agrovoc/c_5830; Http://aims.fao.org/aos/agrovoc/c_3731; Http://aims.fao.org/aos/agrovoc/c_1516.
Ano: 1983 URL: http://hdl.handle.net/1834/3974
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Climate change impacts on hydrology and water resources of the Upper Blue Nile River Basin, Ethiopia AgEcon
Kim, Ungtae; Kaluarachchi, Jagath J.; Smakhtin, Vladimir U..
The report evaluates the impacts of climate change on the hydrological regime and water resources of the Blue Nile River Basin in Ethiopia. It starts from the construction of the climate change scenarios based on the outcomes of several general circulation models (GCMs), uses a simple hydrological model to convert theses scenarios into runoff, and examines the impacts by means of a set of indices. The results, however uncertain with existing accuracy of climate models, suggest that the region is likely to have the future potential to produce hydropower, increase flow duration, and increase water storage capacity without affecting outflows to the riparian countries in the 2050s.
Tipo: Report Palavras-chave: Climate change; Hydrology; River basins; Runoff; Precipitation; Models; Dams; Operating policies; Water power; Drought; Analysis; Africa; Ethiopia; Egypt; Sudan; Upper Blue Nile River Basin; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008 URL: http://purl.umn.edu/53025
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CLIMATE CHANGE SENSITIVITY ASSESSMENT ON UPPER MISSISSIPPI RIVER BASIN STREAMFLOWS USING SWAT AgEcon
Jha, Manoj K.; Arnold, Jeffrey G.; Gassman, Philip W.; Gu, Roy.
The Soil and Water Assessment Tool (SWAT) model was used to assess the impacts of potential future climate change on the hydrology of the Upper Mississippi River Basin (UMRB). Calibration and validation of SWAT were performed on a monthly basis for 1968-87 and 1988-97, respectively; R2 and Nash-Sutcliffe simulation efficiency (E) values computed for the monthly comparisons were 0.74 and 0.65 for the calibration period and 0.81 and 0.75 for the validation period. The impacts of eight 20-year (1971-90) scenarios were then analyzed, relative to a scenario baseline. A doubling of atmospheric CO2 concentrations was predicted to result in an average annual flow increase of 35 percent. An average annual flow decrease of 15 percent was estimated for a constant...
Tipo: Working or Discussion Paper Palavras-chave: Climate change; Flow; Hydrology; Simulation; Spatial patterns; Watershed; Environmental Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/18419
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Compilação e organização de parâmetros físicos de solos da Bacia do Pito Aceso para aplicação no sistema de modelagem hidrológica JAMS. Repositório Alice
GUIDOLINI, J. F.; SCHULER, A. E.; CARNEIRO, F. M.; OLIVEIRA, G. S. de; COSTA, B. de O.; SILVA, M. C. da; PISSARRA, T. C. T..
A escolha de um modelo hidrológico apropriado para uso em dada bacia deve considerar o acesso e custo do software, a viabilidade de aplicação, a disponibilidade e compatibilidade dos dados de entrada, bem como a familiaridade do usuário com os métodos de resolução. Devido às dificuldades e restrições de uso de alguns modelos de precipitação-vazão, a Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), no Centro Nacional de Pesquisa em Solos (CNPS), iniciou pesquisa visando à avaliação do uso do Sistema de Modelagem Adaptável de Jena (JAMS). Este estudo, fruto da parceria da Embrapa com a Universidade de Jena, busca a construção de um modelo precipitação-vazão que simule o escoamento superficial da microbacia do Córrego do Pito Aceso, inserida na Bacia do...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Precipitação; Vazão; Modelos hidrológicos; Bacia hidrográfica; Hidrologia; Vazão; Bacia hidrográfica; Hidrologia; Hydrologic models; Hydrology.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1003776
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Contribution à l'étude de faisabilité d'une usine marémotrice dans le Golfe normano-breton - Zooplanctonologie halieutique ArchiMer
Martin, Jocelyne; Halgand, Daniel.
Zooplankton study presented in this paper, is one of the three parts of fish ecology study undertaken by IFREMER in 1983 on Electricité de France request. The present work draws up an inventory of young stages from meroplanktonic species (fish eggs and larvae, crustacean larvae and postlarvae) in the area studied (a part of gulf of St Malo) together with rather large holoplanktonic organisms. Sampling period (from March to September) and periodicity were choosen according to study of hatching area and period of economical crustaceans. An hydrological study was carried out in the same time.
Tipo: Text Palavras-chave: Zooplancton; Ichtyoplancton; Larves; Crustaces; Hydrologie; Manche; Zooplankton; Ichtyoplankton; Crustacean; Larvae; Hydrology; Channel.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00004/11539/8125.pdf
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Contribution à l'étude des modifications hydro-sédimentaires consécutives à la réouverture artificielle de l'embouchure du Comoé à Grand-Bassam OceanDocs
Koffi, K. Ph.; Abé, J.; Amon Kothias, J.B..
La réouverture artificielle du canal naturel du fleuve Comoé (22 septembre 1987)en vue de l'élimination en mer des plantes flottantes envahissantes, a modifié considérablement l'environnement hydro-sédimentaire du domaine lagunaire à Grand-Bassam. L'action des courants de marée a conféré un caractère plus estuarien aux eaux lagunaires, l'intrusion saline (25-30%0)remontant au delà des ponts de Moossou à la confluence du fleuve Comoé. Ceci a entraîné un curage du cours inférieur du fleuve et surtout des fonds lagunaires antérieurement confinés. La remobilisation des vases (des fonds autour de l'île Bouët), évacuées en suspension vers le large a découvert les faciès sableux lagunaires et marins. Ce nouveau système demeure fragile, par la suite d'un colmatage...
Tipo: Journal Contribution Palavras-chave: River outflow; Hydrology.
Ano: 1991 URL: http://hdl.handle.net/1834/5149
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Correlação entre NDVI e EVI com o Índice de Área Foliar por meio de Imagens de Satélite MODIS. Repositório Alice
SANTANA, N. C.; RODRIGUES, L. N..
2014
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Índice de vegetação; Sensoriamento remoto; Hidrologia; Remote sensing; Hydrology.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1010425
Registros recuperados: 152
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