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Ferguson Landslide
The Ferguson landslide, also commonly called the Ferguson Slide, is an active landslide in the Merced River, Merced River canyon in Mariposa County, California, Mariposa County, California, United States. In 2006, rocks and debris slid off Ferguson Ridge, blocking California State Route 140, a primary access road to Yosemite National Park. The slide still blocked the original road as of late 2021, although temporary bridges allow one-way traffic around the slide and into the park. The slide is a natural phenomenon, and resulted from the erosion dynamics of the river valley. History The slide began on April 29, 2006, and initially the highway remained open, with active monitoring and occasional temporary closures. By May 28, the road was closed permanently, stopping access to the park from Mariposa, California, Mariposa and severely impacting the local economy. Many park employees reside in Mariposa, and for several months a two-hour trip (one way) was required to get to work i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone Salamander
The limestone salamander (''Hydromantes brunus'') is a member of the lungless salamander family. Discovered in 1952, this species belongs to a genus endemic to California. It is endemic to a portion of the Merced River Canyon in Mariposa County, California. Description The limestone salamander has a flattened body, head, webbed toes, and a short tail. It is typically 5.0-7.5 cm in length. Adults are brownish with a pale ventral surface; the male has oval-shaped mental gland. The species was originally thought to be life-birthing, but is now known to lay eggs. Young hatch in the egg and emerge fully formed, with no larval stage. They are yellowish greenish, darkening with age. Like all lungless salamanders, it respires through its skin. Distribution and habitat The genus ''Hydromantes'' is endemic to California. The limestone salamander occurs only in the Lower Merced River drainage, in several disparate localities, at elevations of 300–760 m in inhabits canyon slopes that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landslides In 2006
Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated slope failures, mudflows, and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides. Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable. Causes Landslides occur when the slope (or a portion of it) undergoes some processes that change its condition from stable to unstable. This is essentially due to a decrease in the shear strength of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landslides In The United States
Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated slope failures, mudflows, and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides. Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable. Causes Landslides occur when the slope (or a portion of it) undergoes some processes that change its condition from stable to unstable. This is essentially due to a decrease in the shear strength of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Hazards
Geology () is a branch of natural science concerned with Earth and other Astronomical object, astronomical objects, the features or rock (geology), rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth science, Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the Relative dating, relative and Geochronology, absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Eart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scree
Scree is a collection of broken rock fragments at the base of a cliff or other steep rocky mass that has accumulated through periodic rockfall. Landforms associated with these materials are often called talus deposits. Talus deposits typically have a concave upwards form, where the maximum inclination corresponds to the angle of repose of the mean debris particle size. The exact definition of scree in the primary literature is somewhat relaxed, and it often overlaps with both ''talus'' and ''colluvium''. The term ''scree'' comes from the Old Norse term for landslide, ''skriða'', while the term ''talus'' is a French word meaning a slope or embankment. In high-altitude arctic and subarctic regions, scree slopes and talus deposits are typically adjacent to hills and river valleys. These steep slopes usually originate from late-Pleistocene periglacial processes. Notable scree sites in Eastern North America include the Ice Caves at White Rocks National Recreation Area in southern Ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Shed
A rock shed is a civil engineering structure used in mountainous areas where rock slides and land slides create highway closure problems. A rock shed is built over a roadway that is in the path of the slide. They are equally used to protect railroads. They are usually designed as a heavy reinforced concrete covering over the road, protecting the surface and vehicles from damage due to the falling rocks with a sloping surface to deflect slip material beyond the road, however an alternative is to include an impact-absorbing layer above the ceiling. A further use of this type of structure may be seen protecting the A4 road; although constructed primarily to alleviate risk from falling rocks from a limestone seam it also serves to protect against objects or persons falling from the Clifton Suspension Bridge where the height differential of approximately 70 metres from the bridge to the bottom of the Avon Gorge would give sufficient kinetic energy to even a relatively small item to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caltrans
The California Department of Transportation (Caltrans) is an Executive (government), executive department of the U.S. state of California. The department is part of the Government of California#State agencies, cabinet-level California State Transportation Agency (CalSTA). Caltrans is headquartered in Sacramento, California, Sacramento. Caltrans manages the state's State highways in California, highway system, which includes the California Freeway and Expressway System, supports public transportation systems throughout the state and provides funding and oversight for three state-supported Amtrak intercity rail routes (''Capitol Corridor'', ''Pacific Surfliner'' and ''San Joaquins'') which are collectively branded as ''Amtrak California''. In 2015, Caltrans released a new mission statement: "Provide a safe, sustainable, integrated and efficient transportation system to enhance California’s economy and livability." History The earliest predecessor of Caltrans was the Bureau o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jerry Brown
Edmund Gerald Brown Jr. (born April 7, 1938) is an American lawyer, author, and politician who served as the 34th and 39th governor of California from 1975 to 1983 and 2011 to 2019. A member of the Democratic Party, he was elected Secretary of State of California in 1970; Brown later served as Mayor of Oakland from 1999 to 2007 and Attorney General of California from 2007 to 2011. He was both the oldest and sixth-youngest governor of California due to the 28-year gap between his second and third terms. Upon completing his fourth term in office, Brown became the fourth longest-serving governor in U.S. history, serving 16 years and 5 days in office. Born in San Francisco, he is the son of Bernice Layne Brown and Pat Brown, who was the 32nd Governor of California (1959–1967). After graduating from the University of California, Berkeley and Yale University, he practiced law and began his political career as a member of the Los Angeles Community College District Board of Trustees ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yosemite Valley Railroad
The Yosemite Valley Railroad (YVRR) was a short-line railroad operating from 1907 to 1945 in the state of California, mostly following the Merced River from Merced to Yosemite National Park, carrying a mixture of passenger and freight traffic. Contrary to the name of the railroad, rail service did not extend to Yosemite Valley itself, but rather ended at the park boundary as the construction of railroads is prohibited in the National Parks. Passengers would disembark at the park boundary in El Portal, California and either stay at the Hotel Del Portal or take a stage coach, and starting in 1913 a motor coach, to Yosemite Valley itself. With closure of the Yosemite Sugar Pine Lumber Company in 1942 and the sale of the Yosemite Portland Cement Company to the Henry J. Kaiser Company and subsequent suspension of all operations in 1944 led to a loss of most of the freight track on the railroad. This in addition to the increased competition for passengers from use along the Yosemit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landslide
Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated grade (slope), slope failures, mudflows, and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides. Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable. Causes Landslides occur when the slope (or a portion of it) undergoes some processes that change its condition from stable to unstable. This is essentially due to a decrease in the She ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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