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Bellman's lost-in-a-forest problem is an unsolved minimization problem in geometry, originating in 1955 by the American applied mathematician Richard E. Bellman. [1] The problem is often stated as follows: "A hiker is lost in a forest whose shape and dimensions are precisely known to him.
The sinkhole was formed in karst terrain, which means rock below the surface can easily be dissolved by groundwater circulating through the bedrock. [5] The large hole measures over 1,000 feet in length, almost 500 feet wide and 630 feet deep, with a volume of over 176 million cubic feet. [ 6 ]
The Red Lake sinkhole in Croatia. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet.
Two-thirds of the world’s more than 300 sinkholes are in China, scattered throughout the country’s west - with 30 known tiankeng, Guangxi province in the south has more of of them than ...
Peter Sinks is a natural sinkhole in northern Utah that is one of the coldest places in the contiguous United States.. Peter Sinks is located 8,100 feet (2,500 m) above sea level, in the Bear River Mountains about 20 mi (32 km) east of Logan, within the Wasatch-Cache National Forest.
Thus, the total volume of the silts and clays is reduced, resulting in the lowering of the surface. The damage at the surface is much greater if there is differential settlement, or large-scale features, such as sinkholes and fissures. Aquifer compaction is a significant concern along with pumping-induced land subsidence.
Shaanxi tiankeng cluster is a group of 19 karst sinkholes in Shaanxi Province, China. The discovery was made in February 2016 and announced by geologists on November 24, 2016. [1] Located within a 200 km-long karst landform belt in the southwest part of the province near Hanzhong City, the cluster is one of the largest on Earth. [2]
Sima Humboldt (Sima Mayor) is an enormous sinkhole located on the summit of the plateau of Sarisariñama tepui in Bolívar State, Venezuela.It is unusual for several reasons, including its enormous size and depth, its location on the top of the only forested tepui, having a patch of forest on its base and also due to the weathering process that formed this sinkhole.