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Stadnyk T St Amour N Kouwen N Edwards TW Pietroniro A Gibson JJ 《Isotopes in environmental and health studies》2005,41(1):49-68
Monitoring of stable water isotopes (18O and 2H) in precipitation and surface waters in the Mackenzie River basin of northern Canada has created new opportunities for researchers to study the complex hydrology and hydroclimatology of this remote region. A number of prior studies have used stable isotope data to investigate aspects of the hydrological regime of the wetland-dominated terrain near Fort Simpson, Northwest Territories, Canada. The present paper compares estimates of groundwater contributions to streamflow derived using the WATFLOOD distributed hydrological model, equipped with a new water isotope tracer module, with the results of conventional isotope hydrograph separation for five wetland-dominated catchments along the lower Liard River. The comparison reveals highly promising agreement, verifying that the hydrological model is simulating groundwater flow contributions to total streamflow with reasonable fidelity, especially during the crucial snowmelt period. Sensitivity analysis of the WATFLOOD simulations also reveals intriguing features about runoff generation from channelized fens, which may contribute less to streamflow than previously thought. 相似文献
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Antonelli M. L. Calace N. Fortini C. Petronio B. M. Pietroniro B. M. Pusceddu P. 《Journal of Thermal Analysis and Calorimetry》2002,70(1):291-297
In the present paper we studied the complexation capacity towards copper ion of fulvic acids extracted from Arno River and
Lake Como sediments, as well as Antarctic Sea water at different pHs in order to evaluate the interaction of different complexing
groups of fulvic acids with copper ions. The binding capacity studies were carried out by means of titration with a copper-selective
electrode and calorimetric measurements. For the same purpose, the heat of reaction in the complexation of copper ions with
small molecules containing functional groups similar to fulvic acid was also determined. Titration results indicated that
the fraction of bound metal increases with increasing pH (from 5 to 7). This may be accounted for by the increase in the ionisation
of the fulvic acid molecule. Results obtained from calorimetric measurements show that the quantity of total heat involved
in the metal ion-fulvate interactions determines a decreasing exothermic response with increasing pH values.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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