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Showing 1 to 11 of 11 for “"wetting front"”.
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Dynamic Contact Angles And Wetting Front Instability In Soils
… a mechanism for initiating the instability of wetting fronts and the formation of gravity fingers/columns in porous media. To study those dynamic contact angles when gravity effects are present, rectangular capillary tubes are used to facilitate the observation of the complete interface without …
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Measurements and interpretation of wetting front infiltration in soils
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Simulação do fenômeno de infiltração em modelos chuva-vazão
… Green & Ampt's infiltration parameters - wetting-front pressure head Ψf’ and hydraulic conductivity at natural saturation K sat - were estimated from soil characteristic curves (matric potential x moisture retention). These curves can be obtained through Rawls, Brakensiek and Saxton's …
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Moisture distribution in soil irrigated with a line source subsurface trickle irrigation system
… moisture distribution indicated that the wetting front expansion is more a function of irrigation volume than irrigation rate. However, the irrigation rate does affect the soil moisture distribution. A higher rate will result in a larger quantity of horizontal water movement. The …
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MONITORING INFILTRATION FROM NATURAL STORMS USING TIME-LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY
… models of unsaturated zone flow assume a uniform wetting front even though the existence of preferential flow paths is well-documented in the literature. TL-ERT surveys were collected perpendicular to a stream at the Stroud Water Research Center in Chester County, PA to provide continuous …
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Effective Green and Ampt parameters for two layered soils
… uppermost layer controls the behavior until the wetting front reaches the boundary of the layers, if the thickness of the top layer is greater than maximum saturated depth, considering only the uppermost layer makes no difference in terms of infiltration process. However, if this is not the case, …
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Water and nutrient transport dynamics during the irrigation of containerized nursery crops
… grown in 2.7 L containers. Tensiometers detected wetting front (WF) movement throughout the substrate during irrigation. 2) Tracer solution (containing NO3-, PO43- and K+) and deionized water (DI) were applied to substrate-filled columns to characterize tracer breakthrough under saturated and …
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OBSERVATION AND MODELLING OF FLUID TRANSPORT INTO POROUS PAPER COATING STRUCTURES
… in a steady laminar flow behaviour at the wetting front, are demonstrated. Mechanisms are proposed which account for the uneven wetting line and its action in leaving parts of the pore network unfilled. Along with other findings, deviations from Lucas-Washburn (LW) scaling are elucidated. …
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Transient Seepage Analysis for Levees and Dams: Numerical and Monitoring Approaches
… as a proxy to assessing the progression of the wetting front in the levees. Accounting for the increase in shear strength due to the presence of matric suction resulted in minimal impacts to stability factors of safety for levee embankments during flood loadings. The results of this …
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Electrical Resistivity Imaging of Preferenital Flow through Surface Coal Mine Valley Fills with Comparison to Other Land Forms
… structure as well as track the advancing wetting front and preferential flow paths. We observed that the upper portion of a fill develops a profile that more closely resembles soil with smaller particle sizes, while the deeper profile has higher heterogeneity, with large rocks and void …
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An Experimental Study on the Infiltration Potential of Stormwater Ponds in Zeekoe Catchment, Cape Town, South Africa
… 2-D simulations, the period required for the wetting front movement from the pond surfaces to the water table ( 5.5 m below the surface) was 15 140 hours. Hydraulic conductivities estimated using the pedotransfer function (PTF) of the built-in software, Rosetta-Lite, were also greater than the …