Predicted effects of proposed navigation improvements on residence time and dissolved oxygen of the salt wedge in the Duwamish River estuary, King County, Washington

Haushild, W. L.; Stoner, J. D.

Abstract:

A model of the circulation and quality of water in the Duwamish River estuary has been sufficiently developed to allow prediction of the effects of a proposed widening and deepening of waterways on residence time and dissolved oxygen in the estuary‘s salt wedge. For a low river-discharge period in August 1970, use of the model yielded an estimated residence time of wedge water to be 6.3 days in the present waterways estuary and 8.6 days in the wider and deeper proposed-waterways estuary--a 37-percent increase. June-September 1970 and for the estuary about 4 miles upstream from its mouth, the model estimates indicate that dissolved-oxygen values in the wedge of the proposed-waterways estuary would be as much as 1.4 milligrams per liter lower and would average 0.4 milligram per liter lower than (average difference significant at 95-percent confidence level) dissolved-oxygen values in the wedge of the present-waterways estuary. Extrapolation to low dissolved-oxygen values of a regression between the predicted dissolved oxygen for both the proposed and present-waterways estuaries suggests that 4 miles upstream of the estuary mouth oxygen would be completely depleted from the proposed-waterways estuary wedge whereas there still would be 0.2 milligram of oxygen per liter of water in the wedge of the present-waterways estuary.

Genre:

USGS Numbered Series

ProdID:

23312

Citation Author:

Haushild, W. L.; Stoner, J. D.

Citation Contributing Office:

Citation Datum:

Citation Day:

Citation Edition:

Citation Editor:

Citation End Page:

Citation Issue:

Citation Keywords:

Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

Citation LatS:

Citation LonE:

Citation LonW:

Citation Month:

Citation No Pagination:

Citation Number Of Pages:

Citation Online Only Flag:

Citation Phsyical Description:

13 p. :ill., map ;27 cm.

Citation Projection:

Citation Public Comments:

Citation Publisher:

U.S. Dept. of the Interior, Geological Survey,

Citation Series:

Open-File Report

Citation Series Code:

OFR

Citation Series Number:

73-102

Citation Search Results Text:

Predicted effects of proposed navigation improvements on residence time and dissolved oxygen of the salt wedge in the Duwamish River estuary, King County, Washington; 1973; OFR; 73-102; Haushild, W. L.; Stoner, J. D.