The study of Urban system of Lorestan province

Today, the countries that have been known as developed countries not only they have high economic and social indicators, but also the distribution of incomes and facilities are justly. But in underdeveloped countries (for example our country Iran), the values of these indicators ( economic & social and etc), are low and their distributions are unjustly. One of the great features of urbanization in underdeveloped counties is inappropriate spatial distribution of cities. One of the phenomena that have been accrued in our cities is macrocephaly phenomenon. Urbanization and the desire to live in major cities, has increased in most countries, especially in less developed countries. The poor spatial distributions of cities are the other feature of urbanization in less developed countries. Macrocephaly phenomenon has been shown in less developed countries and the size of largest city in these countries is more than 5 to 10 equal of size of population of second city. Aggregation of administrative – politic activities and commercial – social activities in first city are deterrent of development in other cities in this countries .As a result, regional and national balance is destroyed. In Iran, this condition is different between cities. So some cities ( for example center of province) are location of aggregation of facilities and population and other city don’t have their facilities and many people due to their needs migrate to first city and then this is led to macrocephaly phenomenon. One of the province in our country that this phenomenon is clearly is Lorestan. Hence, all of facilities and capital have been accumulated in center of province ( Khoram abad city) and other cities don’t have them. Finally this problem is harmful for this provice because population of other cities migration to Khoram abad city ( center of Lorestan province ) and increase population of province center .While, these cities will be faced with reduction of population on the other hand their cities have enough facilities . So should be identified facilities and appropriate of intermediate and small cities also should be strengthened their appropriate to prevent macrocephaly phenomenon in this province. The purpose of this research is, considering and analyzing of urban network Lorestan province by using Lorenz curve, Gini Coefficient, entropy coefficient. At finally present a model in order to improving and strengthening the role of intermediate and small cities in to prevent from macrocephaly phenomenon in province . This research is applied and the method of research is "Descriptive – analytic". The data has been collected library. By using models that was mentioned above, has analyzed urban network of Lorestan province. The findings of research show that according to result of Lorenz curve, Gini Coefficient, density percent in lorestan cities is semi-balanced, also base on entropy coefficient, establishment of population and urban space balance is well. Also by identifying and strengthening and distribution of facilities in intermediate and small cities will be prevented from first city in province. On the other hand if identify facilities of intermediate and small cities, the cites will develop in future.