A decade after the last effort, most restored areas are now just rocks
A regional planning group is laying the groundwork for another large-scale sand project like the one that widened San Diego County beaches a decade ago.
Retention devices such as artificial reefs and groins, structures that can be controversial, also need to be considered, Flick said. Funding is the biggest hurdle for every sand replenishment project, another lesson learned from past efforts. The first step is getting coastal cities to make a financial commitment, preservation group members said.
Oceanside’s move surprised coastal cities to the south, who worry that the groins would block them from the downstream flow of sand along the coast. Studies show the devices slow or stop the steady migration of sand carried by ocean currents, which helps some areas, but hurts others. Most years, the harbor dredging yields about 250,000 cubic yards of sand, enough to keep the channel open and place material on beaches nearest the harbor.
As a result, some sites that received sand in 2001, such as Torrey Pines State Beach, got nothing in 2012. Also, the city of San Diego had recently received sand at Mission and Pacific beaches from dredging the mouth of Mission Bay, so it needed no material from the second regional effort.Carlsbad gets much of its sand from the Agua Hedionda Lagoon, which has been dredged about every two years since the 1950s.
Multiple stages of time-consuming planning, environmental and engineering work are required before any replenishment project can begin. Environmental concerns such as grunion and lobster seasons need to be considered, also the presence of marine mammals, turtles, and nesting birds. But most important, money is needed.
Local money pays a small percentage of the total project costs. Generally, it’s used for things such as feasibility studies and early planning to get the effort started.
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