improved technique for taking hydraulic conductivity cores from forest soils
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improved technique for taking hydraulic conductivity cores from forest soils by G. M. Aubertin

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Published by Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station in Upper Darby, Pa .
Written in English

Subjects:

  • Soils -- Sampling

Book details:

Edition Notes

StatementGerald M. Aubertin.
SeriesUSDA Forest Service research note NE -- 92., Research note NE -- 92.
ContributionsNortheastern Forest Experiment Station (Radnor, Pa.), United States. Forest Service.
The Physical Object
Pagination4 p. :
ID Numbers
Open LibraryOL17617830M
OCLC/WorldCa18525351

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) and hydraulic conductivity (m s-1) at the supply potential, i. and. K. i. are the initial water content (m. 3. m-3) and hydraulic conductivity (m s-1), and. b. is a shape factor that may vary from to /4 but averages about The sorptivity is readily obtained from short term infiltration data for which the cumulative infiltration, I.   In order to develop and test the method for testing the hydraulic conductivity of undisturbed soil samples, we selected 14 research plots located in the Beskid Makowski in south-central Poland ().Samples were obtained at an altitude of – m above sea level, from the horizons of mountain forest soils belonging to brown acid soils (PTG, ), formed out of weathered Magura Cited by: Hydraulic conductivity K (M.T-1) can characterize the hydraulic properties of soils, earths and also the hydraulic properties of the other porous materials and media, from the. The hydraulic conductivity was measured in situ by using the two recently developed techniques (Guelph permeameter and velocity permeameter), and vertical K was also determined in the laboratory with undisturbed soil cores by using a constant head permeameter. The technical description of these methods is given below: Velocity Permeameter.

  Using a transient infiltrometric technique for intensively sampling field-saturated hydraulic conductivity of a clay soil in two runoff plots. Hydrological Processes, 27, – doi: /hyp hydraulic conductivity of earth materials and conductivity of soil liners to leachate, as outlined by the Part permitting rules for hazardous-waste disposal facilities. In addition, a general technique to determine intrinsic permeability is provided. A cross reference between the applicable part of the. Saturated hydraulic conductivity (K S) was measured for each sample. The vertical variation of K S and soil hydrological response under different land covers were analyzed. Results show that K S value in layer 5 was significantly lower than the values of above four layers. The nonlinear least-squares optimization technique employed by RETC offers an attractive and efficient method for predicting the unsaturated hydraulic conductivity from water retention data when measured conductivities are not available.

Determination of Hydraulic Conductivity of Undisturbed Soil Column: a Measurement Accomplished with the Gamma Ray Transmission Technique, Developments in Hydraulic Conductivity Research, Oagile Dikinya, IntechOpen, DOI: / Help us write another book on this subject and reach those readers. KEYWORDS: composite soils, hydraulic conductivity, matrix void ratio, intergranular void ratio 1. INTRODUCTION The classical approach to geotechnical engineering is to separate soils into two major groups; fine-grained soils are those soils that are formed of particles less than mm diameter and coarse-grained soils are formed of particles. However, a major drawback of these two approaches is that variation of hydraulic conductivity during each step of the outflow process cannot be represented. In this paper, an improved pressure plate instrument with an evaporation compensation system is developed to measure the transient water content curve (TWCC) of the soil in multi-step. In general design practice, hydraulic conductivity is estimated based on grain size characteristics of the soil strata (see Highway Runoff Manual M , Section ). In critical applications, the hydraulic conductivity may be determined through in-situ testing. A discussion of field measurement ofpermeability is presented in Sabatini et al.