HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (8) Citing Articles via Google Scholar Google Scholar Articles by Logsdon, S. D. Search for Related Content PubMed Articles by Logsdon, S. D. GeoRef GeoRef Citation Agricola Articles by Logsdon, S. D. Related Collections Structure and Properties Preferential Flow Vadose Zone Processes and Chemical Transport

Determination of Preferential Flow Model Parameters

National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011

View larger version (21K): [in a new window]   Fig. 1. Calculation of the MACRO exponent n* from hydraulic conductivity (K) and head (h) for the macropore region; (a) calculation of n* for various assumed boundary hb values between the macropore and micropore regions; (b) linear regression fitting for the assumed boundary hb of 30 mm, based on the n* values for the curves in (a).

View larger version (24K): [in a new window]   Fig. 2. The actual vs. expected relation between h and for the macropore region, assuming hb to be the maximum measured h value, from desorption or image analysis data

View larger version (13K): [in a new window]   Fig. 3. The fracture half spacing (d) at different assumed boundary head (hb) values between the macropore and micropore region, based on desorption or image analysis data.