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Date Permissions Signed
Date of Award
Master of Science (MS)
Schwartz, Maurice L.
Easterbrook, Don J., 1935-
Phipps, James B.
Net shore-drift along the north coast of Clallam County, Washington, was determined by using geomorphic and sedimentologic indicators. These indicators include changes in bluff morphology, delta plan form, beach width and slope, sediment size gradation, direction of stream mouth diversion, spit growth, deposition and erosion at drift obstructions, identifiable sediment, relict beach ridges, and imbricated beach sediment.
Irregularities in the coastline have caused the shore drift to become divided into drift cells, each displaying zones of supply, transportation, and accumulation. Drift direction determinations were made through field observations of the indicators, supplemented by the study of photographs, topographic maps, and literature.
Winds from the west-northwest prevail (are the most frequent) and predominate (are the most effective sediment movers) over the Strait of Juan de Fuca. The result is a dominant easterly direction of net shore- drift in the study area. However, other directions of net shore-drift were observed along parts of the Clallam County north coast. These shore drift variations occurred in the wave shadow of headlands, where waves are refracted around spits and jetties, or where the coastline differs significantly from the general trend.
Thirty-two drift cells, ranging from 0.4 km to 31.4 km in length, have been identified and their net shore-drift directions determined along the 210 km Juan de Fuca coast of Clallam County. Areas of no appreciable net shore-drift were found over 43.5 km of the study area. This condition exists because of artificial modification of the coastline, the wave energy is too low, or deep water offshore impedes the shore drift.
Western Washington University
Clallam County (Wash.)
Copying of this thesis in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Bubnick, Steven C. (Steven Craig), "Net Shore-Drift Along the Strait of Juan de Fuca Coast of Clallam County, Washington" (1986). WWU Graduate School Collection. 773.