USE OF LORENTZ CURVE FOR ESTABLISHING DEMOGRAPHICAL EVOLUTION MODELS FOR THE RURAL SETTLEMENTS IN THE DANUBE VALLEY, THE GIURGIU-BRĂILA SECTOR

Teodora Mădălina, Andrei
2006 ROMANIAN REVIEW OF REGIONAL STUDIES   unpublished
We used two indicators in order to quantify population's concentration level in a certain area: Lorentz curve and Gini ratio. For our research we took into account two years-1985 and 2002, in order to compare the period previous to 1990 and the one after it. We noticed that a demographical deconcentration process caused by population decrease and disappearance of certain settlements was characteristic of the Danube Valley, in the Giurgiu and Brăila sector. We could identify eight evolution
more » ... s specific to the rural settlements of this area, with four increase and four decrease models. The humanisation degree for a certain area was influenced by the number of people and by their spatial distribution. The spatial concentration of population was the result of the relation between these two indicators. Had population been perfectly distributed, then the weight of each settlement should have been identical to the one occupied by its surface out of the total surface of the researched area. In the Danube sector between Giurgiu and Brăila (figure 1) we noticed a population deconcentration phenomenon caused by demographical decrease. Figure 1. Settlements in the Danube Valley, the Giurgiu-Brăila sector We could analyse quantitavely the population deconcentration phenomenon, reflected in time and space changes, through a series of methods. We used mainly four indices: the disimilarity index, the Lorentz curve, the Gini ratio, and "informational energy" index. In order to identify the population's concentration degree in Giurgiu-Brăila sector, we used two complementary indicators: the Lorentz curve
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