Sand reaches the beaches of this section of coastline from small creeks and rivers and from the erosion of the sandy bluffs. The sand moving along the Santa Cruz coastline starts its shoreline journey about 75 miles upcoast, 15 miles south of San Francisco’s Golden Gate. The waves, however, can’t easily move it across the harbor entrance without the channel plugging it up. If it were put in dump trucks, it would fill about 25,000 of them, but the waves can move all that sand without any human labor, and without any noise or carbon emissions. ![]() By Gary Griggs, Distinguished Professor of Earth and Planetary Sciences, Director Institute of Marine Sciences, University of California, Santa Cruz, CaliforniaĮvery year the dredge at the Santa Cruz Small Craft Harbor along central California’s northern Monterey Bay sucks up about 250,000 cubic yards of sand, on average, from the entrance channel and pumps it out onto Twin Lakes Beach where it continues its journey down coast (Figure 1).
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