Results 201 to 210 of about 42,387 (220)

Relative humidity effects on contact angle and water drop penetration time of hydrophobized fine sand

Soil Science and Plant Nutrition, 2008
Abstract The purpose of this study was to determine the effects of ambient relative humidity (RH) on contact angle and water drop penetration time (WDPT) using a series of sand samples hydrophobized with stearic acid. The contact angle was estimated using the sessile drop method.
D. A. L. Leelamanie, Jutaro Karube, Aya Yoshida   +2 more
openaire   +3 more sources

On standardizing the ‘Water Drop Penetration Time’ and the ‘Molarity of an Ethanol Droplet’ techniques to classify soil hydrophobicity: A case study using medium textured soils

Earth Surface Processes and Landforms, 1998
Two common methods to assess soil hydrophobicity are the ‘Water Drop Penetration Time’ and ‘Molarity of an Ethanol Droplet’ techniques. For these, uncertainty exists regarding the representativeness of laboratory tests reflecting field conditions, their replicability, and the comparability of results between the two techniques.
Stefan Doerr
openaire   +4 more sources

Comparing different application procedures of the water drop penetration time test to assess soil water repellency in a fire affected Sicilian area

CATENA, 2019
Abstract The Water Drop Penetration Time (WDPT) technique was applied in two subsequent years (2016 and 2017) to check surface soil water repellency (SWR) in a Sicilian mountain area affected by a wildfire on June 2016. A total of 93 sites were sampled and from 3 to 100 droplets were used to characterize a site.
Tinebra I., Alagna V., Iovino M., Bagarello V.   +3 more
openaire   +3 more sources

On using the effective contact angle and the water drop penetration time for classification of water repellency in dune soils

Earth Surface Processes and Landforms, 1988
AbstractSandy soils are often water repellent when dry. In sloping areas this may result in surface runoff and erosion. Water repellency in soils can be classified with the solid‐liquid contact angle which is difficult to determine. Another method is the water drop penetration time.
openaire   +3 more sources

The impalement of water drops impinging onto hydrophobic/superhydrophobic graphite surfaces: the role of dynamic pressure, hammer pressure and liquid penetration time

Applied Surface Science, 2014
Abstract Droplet impingement experiments at low Weber numbers were conducted by digitizing silhouettes of impacting water drops onto unlike graphite substrates, typified by different advancing water contact angles ( θ a ): 140 and 160°. The relaxation of wetting diameter, dynamic contact angle, and drop shapes were measured.
Paola G. Pittoni, Ya-Chi Lin, Shi-Yow Lin   +2 more
openaire   +3 more sources

Water Drop Penetration Time Revisited

2022
<p>Water drop penetration time (WDPT), i.e. the time it takes for a water drop to be absorbed by the soil, is widely used as a measure of soil water repellency. Despite its popularity, little is known about the processes that govern WDPT and how WDPT is related to other soil hydraulic properties such as sorptivity.
Markus Berli, Rose Shillito, Shelby Inouye, George Nikolich, Vic Etyemezian   +4 more
openaire   +1 more source

Video Analysis of Water Drop Penetration Time Using Temporal Action Localization for Evaluating Soil Water Repellency

Lecture Notes in Computer Science
Danxu Wang, Emma E. Regentova, Venkatesan Muthukumar, Markus Berli, Frederick C. Harris   +4 more
openaire   +3 more sources

Using the effective contact angle and water drop penetration time for classification of water repellancy in dune soils. Short communication

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1989
openaire   +3 more sources

Automated Measurement of the Water Drop Penetration Time for the Analysis of Soil Water Repellency

In this work, we develop an innovative system for the automated measurement of Water Drop Penetration Time (WDPT) - a parameter that is conventionally used for evaluating soil water repellency (SWR). Increased SWR can be a reason for plant stress and poor crop yields, create a risk of potential water runoff and floods and thus can pose risks to life ...
openaire   +1 more source

The Dropbot: Design and Development of a Custom Drone for Precision Water Drop Penetration Time (WDPT) Testing

Assessing the hydrophobic characteristics of soil is vital for understanding soil wettability or soil-water interactions, particularly in post-wildfire environments where water repellency can significantly impact ecosystem recovery, water infiltration, and erosion control.
openaire   +1 more source