Monday, February 16, 2015

Maps provide another view of South Florida history

The government's first nautical map of South Florida (1855)
showed most of the development was south of the Miami River.
(NOAA Office of Coast Survey)

 South Florida in 2015 with the Marine GeoGarage

From Sun Sentinel by Ken Kayle

In 1854, six years before the Civil War, the U.S. government first mapped the South Florida coastline, primarily to mark the depth of shoreline waters and prevent ships from breaking up on rocks.
The map didn't show much other than obscure landmarks such as Turkey Point, a place that actually had turkeys, not a nuclear plant.
Over the decades, updated maps were produced, depicting the rapid buildup of the coastline and providing another view of history.
Now, you can see it for yourself, free of charge.
The National Oceanic and Atmospheric Administration's Office of Coast Survey has put all its maps on its online site – historicalcharts.noaa.gov.

"You see the progression of coastal changes," said agency spokeswoman Dawn Forsythe.
"You can match them up and compare them with today's charts."
For instance, the 1855 map shows the bulk of South Florida's population was south of the Miami River, in what is now downtown Miami.
Aside from Virginia Key and Key Biscayne, most of the landmarks had unfamiliar names, such as Shoal Point, Black Point and Elliott's Beach.

 Here's the nautical map for Fort Lauderdale in 1895.

 Fort Lauderdale with the Marine GeoGarage in 2015

Four decades later, in 1895, a map indicated development was spreading north.
The Fort Lauderdale area is shown having two settlements, Lauderdale and Cocoa Palms, near what is now Sunrise Boulevard.
By 1927, Miami, Fort Lauderdale and West Palm Beach already were fairly well developed. However, Port Everglades still was Lake Mabel, three to six feet deep with a rocky bottom.
By 1951, maps show the entire South Florida coastline was burgeoning with cities, canal systems, ports, isles, bridges, tall buildings and docks.

That was the result of a land boom, said Debi Murray, chief curator of the Historical Society of Palm Beach County.
"The early 20th Century was a period of huge growth because of the Flagler railroad and because people started selling lots like crazy," she said.
Something the maps don't clearly depict: How two Category 4 hurricanes, in 1926 and 1928, devastated the region for years.

The maps prior to those storms show South Florida's cities having simple street grids and little coastal development.
Yet by the mid 1930s, maps show Miami, Fort Lauderdale and Miami flourishing with swing bridges, a network of waterways, yacht clubs, radio towers and water tanks.
In between, the region suffered miserably, Murray said.
"The 1926 hurricane put the brakes on growth and widely affect the entire region," she said.
"The 1928 hurricane destroyed thousands of homes and killed between 3,000 and 3,200 people – and we were already in a local recession then."
What rescued the region was President Franklin D. Roosevelt's Works Progress Administration in 1935, Murray said.
"It put people to work," she said.
"We were also fortunate to have wealthy tourists keep spending money here."

Because the maps are nautical in nature, they show that as late as the 1920s the inland channels sometimes were as shallow as one or two feet.
Most were dredged to nine or 10 feet by the 1960s.
More recent maps provide bottom depths in much more detail.

 1855 U.S. Coast Survey nautical chart or map of Tampa Bay, Florida.
Centered on Passage Point, this map covers from St. Helena and Tampa south to Mullet Key and Palm Key.
Chart notes various triangulation points and the proposed site of a rail depot on the western shore. The city of Tampa is noted though, at this stage, development is minimal.
Countless depth soundings fill the bay.
To the left of the map, below the title, are detailed sailing instructions and notes on tides and shoals. This is one of the earliest Coast Survey charts to focus on Tampa Bay. 
The hydrography for this map was completed by O. H. Berryman.
The chart was produced under the supervision of A. D. Bache, of the most prolific and influential Superintendents of the U.S. Coast Survey.
NOAA's Office of Coast Survey, based in Silver Spring, Md., was established in 1807 at the behest of President Thomas Jefferson, who wanted nautical maps drawn to improve shipping safety and to help the young nation's military better defend itself.
"Knowing more boats were destroyed by accident than war, they decided they needed to do a survey of the coast," Forsythe said.
"The first charts came out in the mid 1830s. We've been doing it ever since."

Maps were not produced every year – in the 1800s and well into the 1900s, it could take five to 10 years to produce a single map of a region.
It was a painstaking process.
Survey teams would measure water depths by dropping a lead ball attached to rope over the side of a ship until it hit bottom.
Then they would move about 500 feet and do it again, going back and forth, like a "mower over a lawn," Forsythe said.
Then engraved copper plates and a lithograph were used to produce a map.
Despite that tedious process, in the past 180 years, the Office Coast Survey has accumulated 35,000 historical maps of the entire U.S. coastline, covering about 3.4 million square miles.
"Now cartographers sit in front of computers," Forsythe said.
"About 150 charts are updated each week with critical corrections, available digitally."
While the maps are mainly used by the marine community, they also have been used by movie production companies to ensure accuracy of sets for given time eras.
And the behind-the-scenes data used to compile the maps has been used to develop storm surge prediction models, Forsythe said.
She added that the maps make great gifts for history and marine buffs.
"They are really cool to sit there and explore. It's another way of looking at history," she said.

Sunday, February 15, 2015

The Wedge : legendary backwash

Sunny morning in California by Alex Verharst

 
 Slow Motion Carnage

The Wedge with the Marine GeoGarage :
a surf break in Newport Beach CA that is known to be deadly.

Saturday, February 14, 2015

The mystery of life

The mystery of life from Adil Schindler
 "Accept the pain and celebrate the joys"


On January 28th and 29th. two unusual events coincided at the legendary divesite of Roca Partida in the Eastern Pacific.

 Roca Partida with the Marine GeoGarage

The divers of the Mexican Liveaboard SolmarV encountered an unusually friendly humpback whale mama with her newborn who allowed them unparalleled close encounters underwater.
The next day 2 Orcas showed up at the dive site and executed natures plan of order.... 

Google Maps goes coastal with unmanned boat

A Street View Trekker mounted on an autonomous Wamv robot passes the Exploratorium.
and see the San Francisco Shoreline streetview imagery in Google Maps at maps.google.com/ocean

From SFGate by Kristen V. Brown

Recent visitors to San Francisco Bay might have spotted something strange: a small unmanned vessel zipping through the water with a mysterious sphere mounted atop its two parallel hulls.
“What is that?” one bystander asked recently, as the watercraft hugged the shoreline off of Fort Mason.
“Is it a water drone?” asked another.

For the past few months, the nonprofit San Francisco Baykeeper has been remotely piloting the craft — a catamaran topped with a loaner Google Street View camera.
In a teaming of tech and environmental advocacy, Baykeeper is using the camera’s 360-degree imagery to capture the shoreline’s rising sea levels, mapping a meandering 400 miles of the bay’s coast.
The idea is to give people a close-up view of the shore, the kind of view typically available only from a boat.
This, Baykeeper hopes, will rile them up.
“A lot of people know about sea level rise,” said Sejal Choksi, an environmental lawyer and Baykeeper’s interim director.
“We are hoping these images will really bring the reality home to the public, that they will look at pictures of places they know and say, 'Oh my gosh, this is going to be underwater.’”
Google’s Street View cameras have been affixed to cars, boats, people and even camels. But this catamaran, a Wave Adaptive Modular Vessel that keeps the camera steady even as the tide swells, is a first.




Baykeeper initially planned to use kayaks and GoPro cameras to document small parts of the bay. After Baykeeper won a $100,000 grant from Google, though, the Mountain View tech giant offered up its imaging gear.
The camera consists of 15 lenses atop a mast, each angled in a different direction to be stitched together to create a panoramic view.
The catamaran is battery-operated, and controlled via joystick from Baykeeper’s patrol boat.
“It’s basically a large-scale video game,” said Karin Tuxen-Bettman, a Google employee and wetlands-mapping expert who is helping Baykeeper with the project.

Baykeeper began mapping in October.
After more than 20 eight-hour days on the water, the organization has documented 300 miles of shoreline, including wetlands and deltas.
Already, the mapping expeditions have proven revelatory, said Ian Wren, Baykeeper’s staff scientist.
“We noticed in some areas the wetlands are just a few inches above high tide,” he said.
“That means they are at risk for flooding, which could destroy those ecosystems.”

Wren has also discovered abandoned ships at risk of polluting the bay as they rot.
Once the mapping is done, Baykeeper will display the images in interactive maps on its website. They will also be available through Google’s popular Street View tool.
“A lot of agencies talk about sea level rise, but there is not a lot of public input,” Choksi said.
“These kind of issues should be more community-based. They are local, regional problems.”

In addition to using the images to raise public awareness, the nonprofit hopes to establish a baseline against which researchers can measure sea levels in the future.
There is significant research indicating that the global sea level is rising now at a faster rate than in the past.
The Global Mean Sea Level has risen by 4 to 8 inches since record keeping began in 1880. (Sea-level rise is caused by two main things: thermal expansion due to the warming of the oceans and the melting of land-based ice such as glaciers and polar ice caps.)

Baykeeper is not the first environmental group to receive Google’s Street View technology.
Through Google.org, the company’s nonprofit arm, Google has lent its cameras to researchers studying the Galapagos Islands, Tanzania’s Gombe National Park and the Colorado River, among other locations.
Nonprofits, researchers and government tourism agencies can apply to borrow the device.

Tuxen-Bettman said she hopes to eventually work with local governments and nonprofits to map all of the waterways feeding San Francisco Bay.
It might be useful for planning purposes, like documenting infrastructure that might need to be replaced or repaired.
“We want people to see that this kind of information could really be useful,” she said.

Links :







Friday, February 13, 2015

Study finds rising levels of plastics in oceans

Plastics weighing 191 times as much as the Titanic are dumped in the oceans every year as nations led by countries in Asia struggle to manage waste, the first study to quantify the problem showed.

From NYTimes by John Schwartz

Some eight million metric tons of plastic waste makes its way into the world’s oceans each year, and the amount of the debris is likely to increase greatly over the next decade unless nations take strong measures to dispose of their trash responsibly, new research suggests.

The report, which appeared in the journal Science on Thursday, is the most ambitious effort yet to estimate how much plastic debris ends up in the sea.

Indian fishermen pushed their boat through plastic waste last month in Mumbai.
Credit Punit Paranjpe/Agence France-Presse — Getty Images

Jenna Jambeck, an assistant professor of environmental engineering at the University of Georgia and lead author of the study, said the amount of plastic that entered the oceans in the year measured, 2010, might be as little as 4.8 million metric tons or as much as 12.7 million.
The paper’s middle figure of eight million, she said, is the equivalent of “five plastic grocery bags filled with plastic for every foot of coastline in the world” — a visualization that, she said, “sort of blew my mind.”

By 2025, she said, the amount of plastic projected to be entering the oceans would constitute the equivalent of 10 bags per foot of coastline.
 

The researchers then projected the amount of waste going forward based on population growth estimates.

 Any walk along a beach will produce a sizeable haul of plastic waste

“This is a significant study,” said Nancy Wallace, director of the marine debris program at the National Oceanic and Atmospheric Administration, who saw the paper before it was published.
Ms. Wallace applauded what she considered the sophisticated use of available data to estimate the amount of plastic entering the marine environment, both collectively and country by country.
“Of course we know these aren’t absolute numbers, but it gives us an idea of the magnitude, and where we might need to focus our efforts to affect the issue,” she said.

In 2010, 192 countries produced a total of 2.5 billion metric tones of solid waste, including 275 million metric tons of plastic.
An estimated 8 million metric tons entered the ocean that year

The research also lists the world’s 20 worst plastic polluters, from China to the United States, based on such factors as size of coastal population and national plastic production.
According to the estimate, China tops the list, producing as much as 3.5 million metric tons of marine debris each year.
The United States, which generates as much as 110,000 metric tons of marine debris a year, came in at No. 20.
While Americans generate 2.6 kilograms of waste per person per day, or 5.7 pounds, to China’s 1.10 kilograms, the United States ranked lower on the list because of its more efficient waste management, Professor Jambeck said.

Inside the Garbage of the World Documentary from Philippe Carillo
Is the Plastic Trash Island floating in the Pacific Ocean a myth?
Are we getting poisoned?
How long do we have before a worldwide disaster happen?

Plastics have been spotted in the oceans since the 1970s.
In the intervening decades, masses of junk have been observed floating where ocean currents come together, and debris can be found on the remotest beaches and in arctic sea ice.

 Debris from urban activities and runoff accumulates at the edge of Lake Michigan.
(Courtesy Jenna Jambeck/University of Georgia)

The problem is more than an aesthetic one: Exposed to saltwater and sun, and the jostling of the surf, the debris shreds into tiny pieces that become coated with toxic substances like PCBs and other pollutants.
Research into the marine food chain suggests that fish and other organisms consume the bite-size particles and may reabsorb the toxic substances.
Those fish are eaten by other fish, and by people.
Cleaning up the plastic once it is in the oceans is impractical; only a portion of it floats, while most disappears, and presumably what does not wash ashore settles to the bottom.
Any collection system fine enough to capture the smaller particles would also pick up enormous amounts of marine life.
So the best option, Professor Jambeck and others suggest, is to improve waste management ashore.
But prodding developing countries to spend money on waste management is difficult, she acknowledged.
“You’ve got critical infrastructure needs first, like clean drinking water,” she said.
“It’s kind of easy to push waste to the side.”
Over the years she has pursued this line of research, Professor Jambeck said, she has seen a strong, even visceral response from the public.
“You can see waste,” she said.
“Not that people want to.”

Links :