CGRG Bibliography of Canadian Geomorphology
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Author : Gardner, J.T.; English, M.C.; Prowse, T.D.; Carter, T.; and Mackay, R.
Date : 2001.
Title : Impact of seiche events on the hydraulic properties of the Slave River Delta, NWT.
Publication : Annual Scientific Meeting of the Canadian Geophysical Union. May 14-17, 2001, University of Ottawa, Ottawa.
Issue :
Page(s) :
Abstract
The Slave River Delta, NWT is located on the southern shore of Great Slave Lake and is subject to seiche conditions that affect its development. The cumulative effects of a significant fetch distance across the Lake from north to south and prevailing northerly winds that generate wind waves, may have a substantial impact on the hydrological balance of the distributaries in the Slave River Delta. Water flow in distributaries open to the Lake may be impeded or reversed at some levels in the water column, as a result of such wind shear stress on the water surface. Seiche events caused by sustained periods of northerly winds may impede the sediment transport capabilities of the distributaries. Wind measurements (speed and direction) were recorded at the outer portion of the Delta with an anemometer and pressure transducers monitored water levels during the summer and fall of 2000. Hydraulic measurements in the distributaries throughout the Delta were recorded during the summer of 2000. Wind data from Fort Resolution and Hay River are used to identify the periodicity of seiche event trends in the past by relating the data series from those towns to the data recorded on the Delta by statistical means. The area within the Delta influenced by seiche conditions is a function of various factors including channel morphology, slope and orientation and antecedent meteorological and hydrological conditions. These factors and the impacts of seiche events may have significant implications on the morphological development of the Delta. This study describes seiche conditions at the Delta and the impacts on the hydraulic conditions of two major distributaries open to this lake effect.
Bibliography of Canadian Geomorphology