Evaluation of correlations between precipitation, groundwater fluctuations, and lake level fluctuations using spectral methods (Wisconsin, USA)   总被引：2，自引：1，他引：1  

Reza Namdar Ghanbari  Hector R Bravo 《Hydrogeology Journal》2011,19(4):801-810

Spectral methods and 2 years of daily data were used to estimate the phase lag between precipitation and groundwater-level response, and two decades of quarterly data were used to analyze the interaction between precipitation, lake levels and groundwater in the Trout Lake watershed located in Vilas County, Wisconsin, USA. The phase-lag function between precipitation and groundwater response is used to estimate recharge travel time. The recharge travel time and precipitation–groundwater–lake interactions have been traditionally studied using time-domain methods such as physically-based modeling. In this article, the innovative and efficient use of spectral methods is demonstrated to uncover the time scales that are significant in those interactions and estimate the recharge travel time, which is extracted from the underlying daily time series data. The results consistently show that precipitation leads groundwater-level response by up to 5 days in all cases. The effects of precipitation on lake and groundwater levels display strong similarities. Both the precipitation–lake level and the precipitation–groundwater level coherency functions show significant peaks at interannual and seasonal frequencies. The groundwater level–lake level coherency function shows a significant, broad peak at interannual frequencies, and no significant peak at seasonal frequencies, demonstrating the predominance of annual and lower frequencies in groundwater–lake interaction.  相似文献   

Trace elements in Holocene sediments of the southern Doñana National Park (SW Spain): historical pollution and applications     

M. I. Carretero  M. Pozo  F. Ruiz  J. Rodríguez Vidal  L. M. Cáceres  M. Abad  J. M. Muñoz  F. Gómez  J. M. Campos  M. L. González-Regalado  M. Olías 《Environmental Earth Sciences》2011,64(5):1215-1223

The multidisciplinary analysis of core sediments from Doñana National Park, south Spain, permits to delimitate both the paleoenvironmental changes and the geochemical evolution of this area during the Holocene. In a first phase (10–6.5 kyr cal), this area was occupied by freshwater/brackish marshes with periodical alternation of dry periods and humid intervals. In a second phase, these marshes were inundated during the Flandrian transgression (~6.5 kyr cal), with the deposition of bioclastic sands. The third phase (6.5–3.6 kyr cal) is characterized by the transition to an old lagoon, with unpolluted, bottom sediments. The geochemical concentrations of these clayey sediments can be used as a geochemical background for present-day and future environmental evaluations of this area. In the following 600 years approximately, two tsunamis caused the partial infilling of this area with bioclastic, marine sediments. In the interval comprised between these two tsunamis, this lagoon was polluted with heavy metals derived from historical mining activities. This environmental contamination represents one of the oldest evidences of mining pollution in the world (>3 kyr cal BP).  相似文献   

Environmental assessment of water from a uranium mine (Caldas,Minas Gerais State,Brazil) in a decommissioning operation   总被引：1，自引：1，他引：0  

Michelle Burato Campos  Heliana de Azevedo  Marcos Roberto Lopes Nascimento  Cláudio Vítor Roque  Suzelei Rodgher 《Environmental Earth Sciences》2011,62(4):857-863

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Differences in the neighborhood: Structural variations in the carapace of shore crabs Carcinus maenas (Decapoda: Portunidae)     

Allan T. Souza  Martina I. Ilarri  Joana Campos  João C. Marques  Irene Martins 《Estuarine, Coastal and Shelf Science》2011

The present study compared the carapace structure of Carcinus maenas in two nearby sites (2 km apart) within Minho estuary, submitted to different physicochemical and ecological conditions (water temperature, pH, crabs’ density and sex ratio). The carapace structure of the carapace and chelae of the crabs presented significant differences between sampling sites (t-test; p < 0.01). The SIMPER analysis revealed that the Weight/CW and Thickness/CW ratios explained all the dissimilarities found among sites. Overall, the male carapace was proportionally thicker at station 2 (t-test; p < 0.01), while the female carapace was proportionally thicker at station 1 (t-test; p < 0.001). A thicker carapace can be advantageous when competing for food or a sexual partner. We hypothetized that, since at station 2, the density of individuals was twice higher than at station 1, it is likely that agonistic encounters are more frequent, thus favouring a thicker carapace.  相似文献   

Galaxy clustering in the Herschel Deep Field     

H. J. McCracken  †  T. Shanks  N. Metcalfe  R. Fong  A. Campos 《Monthly notices of the Royal Astronomical Society》2000,318(3):913-924

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Radial systems of dark globules in the association Cep OB2     

A. L. Gyulbudaghyan  L. F. Rodriguez  J. Canto 《Astrophysics》1986,24(1):119-121

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Empirical P-L-C relation for δ scuti stars     

P. López de Coca  A. Rolland  R. Garrido  E. Rodriguez 《Astrophysics and Space Science》1990,169(1-2):211-213

Empirical period-luminosity-colour (P-L-C) relations are obtained for the four lowest modes corresponding to radial pulsations. Agreement with predicted values indicates that, in general, both Strömgren photometric calibration and pulsation theory work well for these stars.Paper presented at the 11 th European Regional Astronomical Meetings of the IAU on New Windows to the Universe, held 3–8 July, 1989, Tenerife, Canary Islands, Spain.  相似文献   

An experimental study of the dissolution rates of simulated aluminoborosilicate waste glasses as a function of pH and temperature under dilute conditions     

Eric M. Pierce  Elsa A. Rodriguez  L.J. Calligan  Wendy J. Shaw  B. Pete McGrail 《Applied Geochemistry》2008

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Removal of selected metals from drinking water using modified powdered block carbon     

V. Campos  I. J. Sayeg  P. M. Buchler 《Environmental Geology》2008,55(5):1023-1028

This paper presents the possible alternative removal options for the development of safe drinking water supply in the trace elements affected areas. Arsenic and chromium are two of the most toxic pollutants, introduced into natural waters from a variety of sources and causes various adverse effects on living bodies. Performance of three filter bed method was evaluated in the laboratory. Experiments have been conducted to investigate the sorption of arsenic and chromium on carbon steel and removal of trace elements from drinking water with a household filtration process. The affinity of the arsenic and chromium species for Fe/Fe₃C (iron/iron carbide) sites is the key factor controlling the removal of the elements. The method is based on the use of powdered block carbon (PBC), powder carbon steel and ball ceramic in the ion-sorption columns as a cleaning process. The PBC modified is a satisfactory and practical sorbent for trace elements (arsenite and chromate) dissolved in water.  相似文献   

Statistical method of precipitation prediction     

C. Rodriguez  A. Hernandez  M.R. Fidalgo  J. Garmendia 《Atmospheric Research》1992,28(3-4)

Precipitation records from Salamanca (Spain) are being analyzed to detect temporal oscillations. This paper shows a method to identify these signals in order to determine the behaviour of the precipitation time series in this region.  相似文献