Research Article
Mar 1978
Diurnal Periodicity in Ground-Water Recharge Rates
Authors: Stephen N. Webb and Keith K. WatsonAuthor Affiliations
Publication: Journal of the Irrigation and Drainage Division
Volume 104, Issue 1
Abstract
In an investigation of the flow characteristics of a recharge pit used for artificial ground-water recharge purposes, diurnal variations of a cyclic nature were detected in the intake rate. The output from soil water pressure sensors installed between the base of the pit and the water table indicated similar cyclic variations. The maximum intake rate occurred regularly each day at approximately 2 a.m. - 3 a.m. and the minimum approximately 12 hr later. It is concluded that these variations are due to the activity of algae on the base of the pit and in the top layer of sand. Diurnal peaks and troughs of the algae oxygen production result in changes in the hydraulic conductivity of the profile. This would appear to be related to changes in the volume of the occluded oxygen which exists as bubbles in the soil pores. These reduce the flow area available for recharge and thus cause a reduction in the intake rate.
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Published In
Journal of the Irrigation and Drainage Division
Volume 104 • Issue 1 • March 1978
Pages: 69 - 77
Copyright
© 1978 American Society of Civil Engineers.
History
Published in print: Mar 1978
Published online: Feb 11, 2021
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Authors
Affiliations
Stephen N. Webb
Engr., School of Civ. Engrg., The Univ. of New South Wales, Sydney, Australia
Keith K. Watson
Assoc. Prof., School of Civ. Engrg., The Univ. of New South Wales, Sydney, Australia
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