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Tides are like the earth breathing in and out, in and out. On the in-breath, a myriad of living and once-living things are sucked away from the shore with the water. On the out-breath, everything is pulled back toward the shore and rearranged. In, out, over and over. Endless cycles reveal innumerable scenes for the visually curious, like new paintings created and framed, minute by minute.
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Gentle currents of water draw lines and patterns in the sand. Waves scoop and carve hollows around stranded objects. Pieces of seaweed detach, swish around, and come to rest, leaving calligraphic messages behind. Tangles of plant life, artfully arranged chunks of driftwood, rivulets, ripples – the tides yield a never-ending parade of forms on the beach. Delighting the eyes of toddlers and photographers, piquing the interest of gulls and herons, the shoreline is “ever-present, never twice the same.”*
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Tides wash shorelines the world over but each place where salt water meets land is different. The weather is different, the ecology is different, the geology is different, and the tide cycles are different. Not only do some locations have stronger tides than others, but each high or low tide is different from the last. Many variables are responsible for uneven tides, like bulges in the earth, continents in the ocean, an uneven ocean floor, and an imperfect alignment of the sun, moon, and earth. The seasons and lunar cycles also affect tides.
Here in the Pacific Northwest, a wide strait (the Strait of Juan de Fuca) cuts 96 miles (155km) back into Washington, connecting Puget Sound to the Pacific ocean. That means people living 90 miles from the ocean, like I do, still experience daily tidal cycles. Most places have two low and two high tides per day. In the Pacific Northwest, the lows and highs are mixed, which means that each day’s high tides are at different heights. Each day’s low tides are different, too. Today (at Bowman Bay), shortly after midnight there was a high tide of about 7.9 feet (2.4m). Just before 8am there was a low tide at 1 foot (.3m). The next high tide, at 3:17pm, is almost 3 feet lower than the first one – just 5.1 feet (1.5m). The last low tide of the day is at 6:03pm. At 4.7 feet (1.4m), it will be much higher than the morning low tide. As you can see, sometimes a low tide is almost as high as the previous high tide.
Keeping an eye on tide charts is essential for boaters and I’ve learned it’s worthwhile for me to check tide charts, too. That’s how I know to be at a place like North Beach (below) during a very low tide. Normally only the dark rocks in the photo are visible but during very low tides you can see rocks that have been smoothed and shaped by numberless tides.
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Tide heights can vary a lot, depending on many factors. North America’s Bay of Fundy has the world’s highest tides – as high as 53 feet (16m) – but far to the south, the Caribbean has almost no tides. The reasons for this disparity are too complex to go into here. Though we may not grasp the science, many of us have seen the damage a very high tide combined with strong onshore winds and low pressure does. Whether in person or on media, we’ve seen houses destroyed and shorelines changed by complex interactions between the tides and the weather.
You probably know that around the new and full moon the difference between low and high tide levels increases because the alignment of the sun, earth, and moon magnifies gravitational pull. There are seasonal variations in tide cycles, too – something I didn’t know until I moved to an island. In the Pacific Northwest, summer brings unusually low tides during the daytime and the winter’s lowest tides occur after dark. During the full moon this month, Puget Sound had an extremely low tide, the lowest in over a decade. Foragers and families converged on shorelines throughout the region to experience the extra-low tide, a phenomenon that’s becoming less common due to rising sea levels.
I went to Bowman Bay, my favorite place to walk the beach anytime. I’d hoped to find pretty patterns in the sand but nature had other ideas. What I did find were ribbons of kelp shining in the sunlight (#4 & #5), a bare-bottomed toddler having a blast in the sand, the fresh hoof prints of a running deer, and the same family of Canada geese that I photographed last month. For at least a month these goose parents have kept all six of their goslings safe. I always expect to see one or two fewer, but so far they are all OK.
A few days later the afternoon low tide was still unusually low, so I went to Washington Park. A rocky pocket beach there can be good for tide pooling (searching for creatures in basins of water left by the outgoing tide). The only seastar I found was dead but there were beautiful anemones waving translucent tentacles. Another anemone was the color of an overripe peach.
Something interesting always appears as a result of the tides. These photos are just one person’s observations from walking along Salish Sea shorelines. You’ll find something different.
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*The words, “Ever present, never twice the same” are inscribed on a granite marker that was part of an installation done in 1987 by the artist Robert Irwin at Wave Hill, a New York City public garden where I worked then. That phrase, along with “Ever changing, never less than whole” is also inscribed on stones in the Central Garden, designed by Irwin for the Getty Center in Los Angeles.
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