Dynamics and contribution of karst groundwater to surface flow during Mediterranean flood     

Hervé Jourde  Axel Roesch  Vincent Guinot  Vincent Bailly-Comte 《Environmental Geology》2007,51(5):725-730

This paper describes the role of groundwater contribution to surface flow at the Causse d’Aumelas, a karst system near Montpellier (France), which is traversed by an intermittent river, the Coulazou. A first hydrologic model integrating a digital terrain model shows the inability of a standard rainfall-runoff model to replicate recorded flood hydrographs. While the flood peaks are routed through the karstic system along the Coulazou without a phase lag, the peak magnitude is somewhat modified. These results indicate an initial karst system recharge followed by a significant contribution to surface flow. A hydrodynamic analysis of ground-water flow confirms these results: the karst system first absorbs part of the rainfall, which induces a general water table rise within the aquifer, and then contributes to surface flow in the Coulazou.  相似文献   

Precursory Subsurface 222Rn and 220Rn Degassing Signatures of the 2004 Seismic Crisis at Tenerife, Canary Islands     

Nemesio M. Pérez  Pedro A. Hernández  Eleazar Padrón  Gladys Melián  Rayco Marrero  Germán Padilla  José Barrancos  Dácil Nolasco 《Pure and Applied Geophysics》2007,164(12):2431-2448

Precursory geochemical signatures of radon degassing in the subsurface of the Tenerife Island were observed several months prior to the recent 2004 seismic-volcanic crisis. These premonitory signatures were detected by means of a continuous monitoring of ²²²Rn and ²²⁰Rn activity from a bubbling CO₂-rich gas spot located at 2.850 m depth inside a horizontal gallery for groundwater exploitation at Tenerife. Multivariate Regression Analysis (MRA) on time series of the radon activity was applied to eliminate the radon activity fluctuation due to external variables such as barometric pressure, temperature and relative humidity as well as power supply. Material Failure Forecast Method (FFM) was successfully applied to forecast the anomalous seismicity registered in Tenerife Island in 2004. The changes in the ²²²Rn/²²⁰Rn ratio observed after the period of anomalous seismicity might suggest a higher gas flow rate and/or changes in the vertical permeability induced by seismic activity.  相似文献   

The ionization of the shell of Novae: A time-dependent model     

J. A. de Freitas Pacheco  Laerte Sodré Jr. 《Astrophysics and Space Science》1979,61(1):91-100

The authors describe a simple model of an ionization-front propagating in a homogeneous expanding Nova shell. They have estimated the ejected shell mass, the shell ionization time and the Ly-c output from the remnant for several Novae, and present some correlations between these quantities and other Nova parameters.  相似文献   

Semi-automated filtering of data outliers to improve spatial analysis of piezometric data     

Yohann Tremblay  Jean-Michel Lemieux  Richard Fortier  John Molson  René Therrien  Pierre Therrien  Guillaume Comeau  Marie-Catherine Talbot Poulin 《Hydrogeology Journal》2015,23(5):851-868

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Hydro-economic analysis of groundwater pumping for irrigated agriculture in California’s Central Valley,USA     

Josué Medellín-Azuara  Duncan MacEwan  Richard E. Howitt  George Koruakos  Emin C. Dogrul  Charles F. Brush  Tariq N. Kadir  Thomas Harter  Forrest Melton  Jay R. Lund 《Hydrogeology Journal》2015,23(6):1205-1216

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New investigations in southwestern Guinea: consequences for the Rokelide belt (West Africa)     

Michel Villeneuve  Hervé Bellon  Michel Corsini  Joël Le Metour  Sébastien Chatelee 《International Journal of Earth Sciences》2015,104(5):1267-1275

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Seasonal variations of surface duct conditions in Ngaoundere,North Cameroon     

Samuel Kaissassou  André Lenouo  Armand Nzeukou  Clément Tchawoua  D. A. Vondou 《Meteorology and Atmospheric Physics》2015,127(6):659-674

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Application of weather radar CAPPI data to verify NWP rainfall accumulation data     

José Marcio Bassan  João Eduardo Machado Perea Martins  Shigetoshi Sugahara  Reinaldo Bomfim da Silveira 《Meteorology and Atmospheric Physics》2015,127(6):725-743

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Impact of droughts on child mortality: a case study in Southern African countries     

Khan  Mohammad Zaved Kaiser  Rahman  Ataur  Rahman  Mohammad Azizur  Renzaho  André M. N. 《Natural Hazards》2021,108(2):2211-2224

Natural Hazards - Natural hazards like floods and droughts affect many aspects of life. The study in particular examined the impacts of droughts on under-five mortality rate in Southern Africa,...  相似文献   

Surface impurities on giant gypsum crystals from “la Cueva de las Espadas” (Cave of Swords), Naica,Mexico     

Castillo-Sandoval  Isaí  Fuentes-Cobas  Luis E.  Pérez-Cazares  Bernardo E.  Esparza-Ponce  Hilda E.  Fuentes-Montero  María E.  Castillo-Michel  Hiram  Eichert  Diane  Reyes-Cortes  Ignacio  Carreño-Márquez  Iván J.  Napoles-Duarte  José M.  Montero-Cabrera  María E. 《Mineralogy and Petrology》2018,112(6):865-879

Mineralogy and Petrology - The Cave of Swords was discovered in 1910 at Naica, Chihuahua, México. During the last century, human presence has changed the microclimate conditions inside this...  相似文献