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Browsing Duke Faculty Articles by Duke-affiliated Author "Porporato, Amilcare"

Now showing items 1-10 of 10

Analysis of soil carbon transit times and age distributions using network theories

Manzoni, Stefano; Katul, Gaby; Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2009)

The long-term soil carbon dynamics may be approximated by networks of linear compartments, permitting theoretical analysis of transit time (i.e., the total time spent by a molecule in the system) and age (the time elapsed ...
Causality across rainfall time scales revealed by continuous wavelet transforms

Molini, Annalisa; Katul, Gaby; Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

Rainfall variability occurs over a wide range of time scales owing to processes initiated by cloud microphysics and sustained by atmospheric circulation. A central topic in rainfall research is to determine whether rainfall ...
Comparative study of ecohydrological streamflow probability distributions

Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

We run a comparative study of ecohydrological models of streamflow probability distributions (pdfs), p(Q), derived by Botter et al. (2007a, 2009), against field data gathered in different hydrological contexts. Streamflows ...
Effect of different jump distributions on the dynamics of jump processes

Porporato, Amilcare (AMER PHYSICAL SOC, 2010)

The paper investigates stochastic processes forced by independent and identically distributed jumps occurring according to a Poisson process. The impact of different distributions of the jump amplitudes are analyzed for ...
Impact of stochastic fluctuations in storage-discharge relations on streamflow distributions

Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

In this paper we extend recent theoretical results on the structure of the probability density function of streamflows forced by stochastic rainfall sequences. Our extension is aimed at incorporating an additional, independent ...
Natural streamflow regime alterations: Damming of the Piave river basin (Italy)

Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

A novel approach is proposed to estimate the natural streamflow regime of a river and to assess the extent of the alterations induced by dam operation related to anthropogenic (e. g., agricultural, hydropower) water uses ...
The role of tectonic uplift, climate, and vegetation in the long-term terrestrial phosphorous cycle

Porporato, Amilcare (COPERNICUS GESELLSCHAFT MBH, 2010)

Phosphorus (P) is a crucial element for life and therefore for maintaining ecosystem productivity. Its local availability to the terrestrial biosphere results from the interaction between climate, tectonic uplift, atmospheric ...
Scale-wise evolution of rainfall probability density functions fingerprints the rainfall generation mechanism

Molini, Annalisa; Katul, Gaby; Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

The cross-scale probabilistic structure of rainfall intensity records collected over time scales ranging from hours to decades at sites dominated by both convective and frontal systems is investigated. Across these sites, ...
Stochastic modeling of soil salinity

Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

A minimalist stochastic model of primary soil salinity is proposed, in which the rate of soil salinization is determined by the balance between dry and wet salt deposition and the intermittent leaching events caused by ...
Traditional and microirrigation with stochastic soil moisture

Vico, Giulia; Porporato, Amilcare (AMER GEOPHYSICAL UNION, 2010)

Achieving a sustainable use of water resources, in view of the increased food and biofuel demand and possible climate change, will require optimizing irrigation, a highly nontrivial task given the unpredictability of ...