Record Display for the EPA National Library Catalog


Main Title Crusting and Swelling Effects on Water Infiltration into Soil.
Author Nofzige, D. L. ; Swartzendrube, D. ; Ahuj, L. R. ;
CORP Author Purdue Univ., Lafayette, Ind. Water Resources Research Center.
Year Published 1973
Report Number TR-28; OWRR-B-014-IND; 04630,; B-014-IND(4)
Stock Number PB-214 541
Additional Subjects ( Soil water ; Fluid infiltration) ; ( Soils ; Fluid infiltration) ; Absorption ; Gamma rays ; Moisture content ; Silts ; Clays ; Loams ; Bentonite ; Swelling ; Numerical analysis ; Porosity ; Nondestructive tests ; Gamma spectrometers ; Experimental data ; Capillarity ; Soil crusts
Library Call Number Additional Info Location Last
NTIS  PB-214 541 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 101p
One-dimensional, horizontal soil-water absorption through a thin but resistive inlet zone of soil was studied theoretically and experimentally. An exact numerical solution was obtained, and also an approximate solution based on similarity reduction that held with good accuracy for early to intermediate times of flow, for both the numerical-analysis data for Yolo soil and the experimental measurements performed on Salkum silty clay loam. Also, the principle of dual-energy gamma-ray attenuation was successfully developed for measuring both water and soil content in swelling soils. The dual-energy gamma-ray beam was produced by a 280-mc source of 137Cs placed behind a 389-mc source of 241Am, all in lead shields and collimators. Single-detector separation of the count intensities from 137Cs and 241Am was achieved by a straightforward calibration. Measurements were nondestructive, and relatively precise and rapid. (Author)