Analysis of urbanization change according to NEHRP soil classification Map

Abstract

Geological and geotechnical researches and studies must be done before the preparation of construction plans of urban area for the proper and safe construction. The perfect urbanization should be carried out on the pre-determined favorable soil. In this scope, 32 different Seismic Cone Penetration Test (SCPT) was applied into new alluvial deposit in the study area. The studied area is approximately 25 km2. The soil classification map of the studied area was prepared based on the regional changes of the average shear wave velocity (Vsav) value of the unconsolidated layer recommended by the standards of National Earthquake Hazards Reduction Program (NEHRP). Supervised classification method was applied on Landsat satellite images of 1987 and 1999 of the area to determine the development of urbanization. Development of the urbanization was examined according to NEHRP soil classification. The distribution of the urban development on different soil conditions was sought using Geographic Information System (GIS). It is determined that, the increase of urbanization on the D type soil and E type soil were 63 % and 7 % respectively. On the other hand 30 % increase was determined on old alluvial deposit and rock formations. As a result, it is understood that the development of urbanization was increasing on unavailable soil conditions.