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Approximate analysis of falling‐head lined borehole permeameter
Author(s) -
Philip J. R.
Publication year - 1993
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/93wr01688
Subject(s) - permeameter , borehole , falling (accident) , geology , head (geology) , hydraulic head , geotechnical engineering , tube (container) , flow (mathematics) , pressure head , base (topology) , mechanics , soil science , soil water , hydraulic conductivity , geomorphology , materials science , mathematics , physics , thermodynamics , medicine , environmental health , composite material , mathematical analysis
The falling‐head lined borehole permeameter consists of a snugly fitting tube extending to the base of a vertical borehole in unsaturated soil. Water is suddenly introduced into the tube to standard depth, and the subsequent time course of water depth is observed. Soil‐water data in the Amazon basin has been secured with this instrument. We develop an approximate analysis based on a Green‐Ampt model, with the flow treated as a gravity‐perturbed spherically symmetrical pressure‐capillarity‐driven flow.