Estudo da erosividade e espacialização dos dados com técnicas de geoprocessamento na carta topográfica de Uberlândia-MG para um período de 30 anos.

Abstract

This work was carried out to determine the rainfall erosivity of its annual distribution and its relations with precipitation in the topographical map in the divise of states of Goiás and Minas Gerais, located among the coordinates 18º to 19º of South latitude and 48º to 49º 30’ of longitude West. Was used data of 11 places regarding 30 years of the monthly medium precipitations. It was verified that in the 30 year old period the annual medium precipitation was of 14534 mm, and the largest index happened the month of December with 2779 and the smallest in July with 8,4 mm. The EI30 it varied of 71798 MJ mm ha-1 h-1 year-1 to 8869,9 MJ mm ha-1 h-1 year-1, whose more representative period concentrated on the months of october to may with 7557,3 MJ mm ha-1 h-1 year-1, corresponding at 94,5% of the annual index EI30. An irregular distribution of the rains exists in the area and spacial variability of the erosivity indexes inside of the topographical map. The largest precipitations coincide with the period of the prepare mainly of the soils and development of the plants of annual cycle as soy bean and the corn.