Search results for "Infiltrometer"
showing 3 items of 53 documents
A simple field method to measure the hydrodynamic properties of soil surface crust
2013
The hydraulic resistance of the surface crust was determined by a combination of two infiltrometric techniques: first, a surface measurement of steady-state infiltration rate is conducted by a mini-disk tension infiltrometer (MDI); then, the surface crust is removed, its thickness is measured, and a ponded infiltration test is performed at the same site. The Beerkan Estimation of Soil Transfer parameters (BEST) method is applied to estimate the hydraulic properties of the underlying soil provided the particlesize distribution and the bulk density are known. Under the assumption of a unit gradient of hydraulic head below the soil crust, the pressure head at the interface crust-soil is derive…
INDAGINE SULL’ IDROREPELLENZA DEL SUOLO DI UNA PINETA ARTIFICIALE MEDITERRANEA
2016
Nell’indagine è stata caratterizzata l’idrorepellenza del suolo di una pineta artificiale Mediterranea utilizzando sia il tradizionale Water Drop Penetration Time (WDPT) test che due indici desunti da esperimenti di infiltrazione condotti con il MiniDisk Infiltrometer (MDI). In particolare, il Repellency Index (RI) è stato calcolato come rapporto tra i valori di sorptività misurati con etanolo e acqua, mentre il Water Repellency Cessation Time (WRCT) è stato ricavato utilizzando l’informazione acquisita nella fase idrofobica e in quella idrofila del processo di infiltrazione con acqua. Tutti gli indici hanno inequivocabilmente indicato che la lettiera di Pinus pinaster è altamente idrofobic…
Alternative analysis of transient infiltration experiment to estimate soil water repellency
2019
The repellency index (RI) defined as the adjusted ratio between soil‐ethanol, Se, and soil‐water, Sw, sorptivities estimated from minidisk infiltrometer experiments has been used instead of the widely used water drop penetration time and molarity of ethanol drop tests to assess soil water repellency. However, sorptivity calculated by the usual early‐time infiltration equation may be overestimated as the effects of gravity and lateral capillary are neglected. With the aim to establish the best applicative procedure to assess RI, different approaches to estimate Se and Sw were compared that make use of both the early‐time infiltration equation (namely, the 1 min, S1, and the short‐time linear…