Associated Disasters to the Debris Flows

In this article some of the disasters associated to the presence of the debris flows are described briefly happened in some countries of the world in recent years, which have been observed and, in some occasions, measures its fundamental characteristics, for example: The United States, China, Japan, Italy, Taiwan, Central Asia, Germany, Switzerland, Russia, the Philippines, the Ukraine, Canada, Brazil, Ecuador and Venezuela. In the country of Mexico have appeared great amount of debris flows in the recent years, many of them in the Mexican trans-volcanic axis and coastal mountain ranges, such as the happened ones in Popocatepetl volcano, the volcano Pico de Orizaba, the volcano Nevado de Toluca, mountains of Puebla, in Acapulco, Gro., in the city of Tijuana, B.C. and in the coastal mountain range of Chiapas and Oaxaca, to only mention those that have produced important disasters in recent times. In the article the characteristics of the disasters produced in different regions from Mexico are also described. To identify the mechanisms that they involve to the solid material within a liquid flow, it is necessary to analyze the roles played by the several operating forces in the genesis of the movement in a debris flow. The developed approaches to date are the following ones: model of stability of infinite slope, approach of Shields, approach of Takahashi and recent developments. In order to be able to apply the previous models it is necessary to have very great information of diverse points on the land, with which a calculation mesh forms, therefore is essential to develop a GIS in the analysis site. A model appears in the complete article to determine the characteristics in the zone of beginning of a debris flow, which includes the development of a SIG.