Research Article
Feb 1967
Time-Series Analyses of Water-Quality Data
This article has a reply.
VIEW THE REPLYThis article has a reply.
VIEW THE REPLYThis article has a reply.
VIEW THE REPLYPublication: Journal of the Sanitary Engineering Division
Volume 93, Issue 1
Abstract
The basic concepts of Fourier and power spectrum analyses are presented in terms of their application to dissolved oxygen and temperature data of the Delaware Estuary. The results of Fourier analyses computations performed on hourly data from water-quality monitoring stations are presented. For temperature, more than 92% of the total variance is accounted for by the 365-day periodicity. For dissolved oxygen, more than 90% of the total variance is accounted for by the annual periodicity and the next four higher harmonics (semi-annual; tri-annual, etc.). The dissolved oxygen variability remaining after removal of the principal Fourier components was found to be approximately normally distributed with an average standard deviation of 0.85 mg per 1. Power spectrum analyses of the 24-hr averaged DO residual seconds indicated a peak in the region of 30 days to 60 days and for temperature a peak is dominant at 30 days. The analyses all indicate a predominance of low frequency (periods of from 7 days to 1 yr and longer) types of phenomena. The implications of the results from a sampling and control point of view are evaluated.
Get full access to this article
View all available purchase options and get full access to this article.
Information & Authors
Information
Published In
Journal of the Sanitary Engineering Division
Volume 93 • Issue 1 • February 1967
Pages: 1 - 24
Copyright
© 1967 American Society of Civil Engineers.
History
Published in print: Feb 1967
Published online: Feb 12, 2021
Permissions
Request permissions for this article.
Authors
Affiliations
Robert V. Thomann, M.ASCE
Assoc. Prof. of Civ. Engrg., Manhattan Coll., Bronx, N. Y.; formerly Tech. Dir., Delaware Estuary Comprehensive Study, Federal Water Pollution Control Admin., U. S. Dept. of the Interior, Philadelphia, Pa.
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.
Cited by
View Options
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.