where does the sand come from on waikiki beach
Waikiki Over time, Waikīkī beach has had problems with erosion, leading to the construction of groynes and beach replenishment projects. For example, in the 1920s and 1930s sand was imported from Manhattan Beach, California, via ship and barge to Waikīkī.[12] Importing stopped in the 1970s. Officials are looking for ways to sustain the existing sand by eliminating loss due to tidal flow.[13] Subject to permits, a partial restoration was completed in the spring of 2012. The proposed project imported sand from nearby shoals and widened the 1,700-foot (520 m) long beach by about 37 feet (11 m) between the Royal Hawaiian Hotel concrete groyne and the Kūhiō Beach crib wall. The project restored the beach to its 1985 shoreline.[14]
Great Sand Dunes National Park and Preserve Great Sand Dunes National Park and Preserve is a national park that conserves an area of large sand dunes up to 750 feet (229 m) tall[4] on the eastern edge of the San Luis Valley, and an adjacent national preserve located in the Sangre de Cristo Range, in south-central Colorado, United States.[5] The park was originally designated Great Sand Dunes National Monument on March 17, 1932 by President Herbert Hoover. The original boundaries protected an area of 35,528 acres (55.5 sq mi; 143.8 km2).[6] A boundary change and redesignation as a national park and preserve was authorized on November 22, 2000 and then established by an act of Congress on September 24, 2004.[2] The park encompasses 107,342 acres (167.7 sq mi; 434.4 km2) while the preserve protects an additional 41,686 acres (65.1 sq mi; 168.7 km2) for a total of 149,028 acres (232.9 sq mi; 603.1 km2).[1] The recreational visitor total was 486,935 in 2017, about 25% more than the 388,308 visitors of 2016.[3]