1,721,010 research outputs found
Weighing Gauge Performance Under Laboratory Simulation of Real World Precipitation Events
No full textMetodo per la correzione dinamica in tempo reale delle misure di intensità di pioggia effettuate da pluviometri a pesata e pluviometro che utilizza tale metodo
No full textEnvironmental Chamber Assessment of the Accuracy of Weighing Gauges Under Low Intensity Reference Flow Rates
No full textMetodo e dispositivo portatile per il potenziamento di pluviometri a vaschette basculanti
No full textSul coefficiente di deflusso delle coperture a verde pensile
No full textA numerical simulation model of the hydrologic response of suitable substrates for greenroof systems has been developed, calibrated and validated. During the first part of the work an experimental data set was obtained from the operation of
a laboratory test-bed aimed at evaluating the hydrologic performance of green roof substrates. The experimental campaign has been carried out with a system configuration consisting of a granular drainage layer and growing medium, this being the same green-roof configuration employed on the
roof of the Laboratory of Hydraulic “E. Marchi” (University
of Genova). In this stage of the work three reference rain intensities were generated and tests were carried out with different test-bed slopes; the detention capability of the system was obtained by calculating the runoff coefficient referring to the
whole duration of the rain event. The second part of the paper reports about calibration and validation of a numerical model of green-roof performance obtained by simulating the same system configuration tested in the experimental campaign. A physically
based model was implemented, which describes infiltration in a partially saturated medium, addressing the hydrologic response of the system within a continuous approach. These achievements allow the interpretation of the substrate behaviour under different conditions than those imposed during the laboratory campaign, therefore extending the study to a wide range of
high intensity/short duration rain events
Weighing gauges measurement errors and the design rainfall for urban scale applications
No full textInvestigation of the accuracy and precision of a modern Weighing Gauge (WG) under non steady-state reference flowrate conditions is addressed as the first objective of the present work. The preliminary development and validation of the laboratory equipment for the generation of variable time step reference flowrates is shown. The generator is characterized by a sufficiently short time response with respect to the expected weighing gauge behavior in order to ensure effective comparison of the measured vs. reference flowrates at very high resolution in time. Preliminary tests were con-ducted on the WG instrument by imposing different generation conditions: a finite step and a double step flowrate generation. The main goal of this initial phase was to characterize the time varying response of the instrument also providing an interpretation based on the dynamic system theory. The second part of the work was devoted to the simulation of biased WG time series under non-steady flowrates with a time resolution of one minute. The internal structure and variability of the generated events was based on 22 years of one-minute RI observations recorded at the meteorological station of Villa Cambiaso (University of Genoa). The influence of the measurement accuracy on the relevant extreme events statistics was analyzed by comparing the original intensity-duration-frequency (IDF) curves with those obtained after the simulation
On the influence of rain gauge performance on extreme events statistics: the case of weighing gauges
No full text
An evaluation of the uncertainty of extreme events statistics at the WMO/CIMO Lead Centre on precipitation intensity
No full textPolynomiality of helicity off-forward distribution functions in the chiral quark-soliton model
No full textviene dimostrata la prpprieta' di polinomialita' per le distribuzioni partoniche generalizzatedel nucleone che dipendono dall'elicita' e che sono derivzate in un modello a quark-solitoni chiral
- …
