1,721,030 research outputs found
A mass-conservative method for the integration of the two-dimensional groundwater (Boussinesq) equation
No full textThis work presents with a new conservative finite-volume numerical solution for the
two-dimensional groundwater flow (Boussinesq) equation, which can be used for investigations of hillslope subsurface flow processes and simulations of catchment hydrology. The Boussinesq Equation
is integrated for each grid element and can take account of the local variability of
topography and soil properties within the grid elements. The numerical method allows for wetting and drying of the water-table, which has been successfully simulated.
The stability and convergence of the method is shown to be guaranteed \textit{a priori} by the properties of the solver itself.
The numerics are validated against some approximate analytical solutions, and compared to another numerical solver of the Boussinesq equation. Finally, the solver capabilities are further explored with simulations of the Panola experimental hillslope where the bedrock topography, which is accurately known, causes complex wetting and drying patterns; in this situation the importance of a two-dimensional description of subsurface flows to obtain properly simulated discharges becomes clear
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Partial melting of carbonatic ultracataclasites due to seismic faulting (Southern Grigna, Central Alps, Italy),
No full text
Network allometry
No full textWe derive a new allometric scaling law for loopless networks, which we confirm with studies on rivers, exact network results and computer simulations. We provide evidence suggesting that ensemble averaging of the allometric property (where individual realizations are different networks) leads to results in excellent accord with the known limit scaling of efficient and compact networks with remarkably little scatter. Our results complement recent work suggesting that network-related allometric scaling in living organisms is regulated by metabolic supply-demand balance, because we show that scaling features are robust to geometrical fluctuations of network properties
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