Restoring wetlands is an extremely effective way to cool land surfaces, a study conducted in the Sacramento-San Joaquin Delta indicates.

Delta Landscapes & Waterways



13
Nov

Restoring wetlands is an extremely effective way to cool land surfaces, a study conducted in the Sacramento-San Joaquin Delta indicates.

For three years, Kyle Hemes of UC Berkeley and colleagues kept tabs on the heat flux and air flow above three restored Delta wetlands on Twitchell and Sherman islands, and an alfalfa field on Twitchell Island. Surface temperatures at wetlands with open water were up to 5.1 degrees Celsius cooler than the crop field during the daytime. As expected, the dark open water absorbed more solar radiation, and released the energy slowly at night. But wetland vegetation played a role as well. The tall, uneven surfaces of tule and cattail stands, and their patchy distribution, hastened the movement of heat away from the land surface. “Whereas we’re often focused on the greenhouse gas reduction benefits of restoration, the significant cooling...
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26
Sep

Big Restoration Experiment for the Delta’s Dutch Slough

Development agreements were already in place for three parcels of land around Dutch Slough when John Cain first took a hike in this West Delta area in the spring of 1999. “It was clear as day to me that removing the levee would be a great way to restore freshwater wetlands at the mouth of Marsh Creek,” says Cain. Almost two decades later, earthmoving equipment is now preparing 1,178 acres for conversion to marsh habitat.
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13
Aug

A new online portal from the Delta Stewardship Council offers everyone from scientists to tourists an accessible window into the Delta’s identity and importance.

“Although I had studied freshwater and marine ecology, I really was not familiar with the Delta before I started working there,” says 2017 Sea Grant Fellow Heidi Williams, who developed the Beginner’s Guide to the Sacramento-San Joaquin Delta. “I was looking for a way to dive in and learn about the Delta and realized that there wasn’t an easily accessible place to turn for the basics.” As a science communications fellow, Williams suggested to the Council that she create one herself, and spent the next year immersed in Delta-related articles and other materials. “I realized that this needed to be more up-to-date than a lot of that material because a lot of science and politics have changed and progressed in...
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15
Jun

Vital and Vulnerable? Delta Contemplates Climate Change

With its pivotal role in California’s ecology and economy, the Delta’s ability to adapt successfully to climate change and sea level rise will have an enormous influence on how well the state as a whole adapts. “Most of the climate vulnerability work in the Delta so far has focused on water resource management, not the array of other potential impacts,” says Delta Stewardship Council’s Kate Anderson. In May, the Council issued an RFQ for an assessment of the Delta’s potential climate vulnerability. It also joined forces with BCDC’s Adapting to Rising Tides program to extened the latter’s cutting edge assessment work around the Bay deeper into the Delta (all the way along the eastern Contra Costa County shore from Pittsburg...
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15
Jun

Corps Explores New Ecological Territory

A levee replacement project near the small town of Hamilton City is breaking ground as the first project that the US Army Corps of Engineers has approved based in part on potential benefits to an ecosystem. “We’ve been told this will be a national model once it’s completed,” says Lee Ann Grigsby of Hamilton City. The levee, whose original construction failed to meet modern standards, had needed to be fixed for a long time: recent estimates gave it only a 66% of withstanding a 10-year flood scenario. In 2002, new Army Corps guidelines permitted ecosystem benefits to be taken into the accounting of costs and benefits. Today, one section of the levee has been completed and restoration of the newly...
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13
Dec

Table Set for Snails

Several months ago, Mike Moran of the Delta’s Big Break Regional Park got a call about a cluster of unusual looking eggs. “We thought we might be looking at this channeled apple snail thing,” he says.
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13
Dec

Searching for a Few Good Weevils

“They’re pretty charismatic,” says Julie Hopper of the tiny herbivorous weevil N. bruchi. Native to Argentina, these weevils were first brought to North America to combat the spread of the invasive weed water hyacinth.
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13
Nov

Broad buy-in is the hoped for result of a proposed new landscape-level vision for conservation of the Delta.

For decades, government agencies, stakeholders, scientists, and planners have tried to develop a common vision for the future Delta, only to be stymied by environmental and economic politics. A new paradigm developed by diverse interests, however, proposes six regional conservation strategies to be achieved through collaborative, phased projects tailored to the needs of each sub-region, with a priority on improving public lands first. Proponents of the new framework say long-term conservation of the Delta is not a choice but an urgent necessity that will benefit people as much as natural communities. “It is a call to work together to improve ecosystem function, bolster ecosystem services for people, support Delta wildlife, and grow our science capacity so we can keep learning conservation lessons,” says...
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26
Sep

The Delta from Within

As an outsider, it’s easy to see the Delta as a mess. Once a paradise of wildlife, it’s now an ecological disaster and the nexus of the fierce water wars between the state’s wet north and dry south. But there’s much more to the Delta, which was settled beginning with the Gold Rush. The 33 miles between Rio Vista and Sacramento on highway 160 feel like another world. The sky is big and the land stretches out in all directions, bounded only by a 360-degree horizon.
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Back to the Bones of the Delta

Anyone who’s been around debates about the Delta’s highest and best
 uses for decades has seen a long train of plans touting this or that kind of restoration to save salmon, smelt, mice, birds and other endangereds. What’s different about the San Francisco Estuary Institute’s recently released Delta Renewed guide is that it finally puts all that’s been learned together in 
one place in a mere 100 pages.
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Keeping the Salt Field at Bay II

After four of California’s driest years on record, our “wet” season was so dry that state water officials panicked.Major reservoirs were drawn way down, and record-low snowpack would limit replenishment to a trickle. Water managers worried about the hot, dry months. Would reservoirs still hold enough for freshwater releases to keep saltwater from pushing deep into the Sacramento-San Joaquin Delta? So they built a barrier to block salt instead.
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10
Sep

Scaled-Down Plans to “Fix and Restore”

Surprising many observers, Governor Jerry Brown announced late in April that the Bay Delta Conservation Program, which had embraced the new water conveyance popularly known as the Twin Tunnels and a broad program for restoring the complex and heavily impacted Delta environment, was being split into two new entities: Cal WaterFix and Cal EcoRestore. On the restoration side, he announced a more modest goal of 30,000 acres, down from the original 100,000.
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16
Dec

Offers They Can Refuse

The numbers are daunting: 8,000 acres to be restored to fish-friendly tidal habitat in order to comply with federal wildlife agencies’ Biological Opinions; another 65,000 if and when the Bay-Delta Conservation Plan is implemented; more still if you add in mitigation for levee operations. Where will that acreage come from? State agencies and other public entities already own some parcels suitable for restoration, but not nearly enough: the rest will need to be purchased from its current owners or covered by easements. (Eminent domain is not on the table; it’s not even clear if it could be invoked for habitat purposes.) And legal constraints make buying land in the Delta harder than you might think. Dennis McEwan of the Department...
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23
Sep

Defter Delta Restoration

An issue paper endorsed by the Delta Stewardship Council this August seeks to spark progress throughout the myriad stages of habitat restoration. As public and private interests gear up to help endangered fish and migrating birds by restoring habitats in six priority zones of the Delta and Suisun Marsh, this paper lays out tools and concepts for getting the most out of these investments and learning from our mistakes. The paper details steps for achieving effective restoration, reviews barriers such as conflicts with existing land uses and the complexity of permitting processes, and recommends strategies for addressing these challenges.
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