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A. Arrigo Cigna - (31/1,2002)
The evolution of cave monitoring since 19th century is described. The advantage of the development of theories was the possibility to obtain comparable results and forecast the evolution of a cave climate before irreversible modifications take place. The most important parameters to be monitored are indicated. In recent years both important technological improvements have been obtained and the relative importance of each parameter has been reviewed. Kartchner Caverns, Arizona, USA, was opened to the public in November 1999. Some preliminary studies have been performed. Arizona Conservation Project, Inc. (ACPI) established 22 monitoring stations. An evaluation of the impact assessment was obtained. The second case concerns Cango Cave. A simple monitoring network has been installed in September 2000 to be operated for one year. It consists in about 15 rugged data loggers distributed along the cave. Air and water temperature, carbon dioxide concentration, and relative humidity are measured and the values are transferred periodically by a shuttle into a computer outside the cave. A totally automatic monitoring network will be installed in the future after the results of the first simple network are achieved.
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