ARID REGIONS GEOGRAPHIC STUDIES
Year:2015 | Volume:5 | Issue:19|Papers Count:7

Iran, due to being a large part of it (21% of total area) on the arid and semi-arid zone among the countries is prone to dust storms. Existing of dust and haze in these area is the main problem that has plagued residents and bystanders and it has occasionally disrupted their lives. Identifying area for producing dust may be determined by using satellite data. However many dust storms can be seen clearly near these area...

Because the geographical space is the fundamental content of the geography science, the discussion of nature of it and this question that what is the "geographical" meaning of "space"? Are always essential issues in the geography science? This article tries to prepare a context to debate of the nature of "geographical space" and it tries to answer to this question that what is the "geographical space"? This article does these via the debating of the philosophical kind of spatial thoughts and via a critical view to them...

Understanding the environmental factors is considered as an applied study aiming to shed light on edaphic and ecological factors influencing the very labor ever and their management. In the hills and sandy desert land with soil conditions grow special plants.In the current research the relationship between the physicochemical properties of the soils and growth characteristics of the S. pennant. In the current research the relationship between the physicochemical properties of the soils and growth characteristics of the S. pennanta including density, canopy cover, height and cordage protean have been studied in the lands of the Sabzevar plain about 75 km southwest of the Sabzevar city. The climate of the study area is cold dry...

Desertification is regarded as the third global challenge of water scarcity and drought crisis in the 21st century. This phenomenon has more damaging effects than other regions in arid, semi-arid and dry semi-wet due to fragile ecosystem. Iran also due to the special geographical position and a fragile ecosystem is at the risk of desertification. In most of the area of natural resources of Iran, the ecosystem is fragile and arid conditions. According to the new definition of desert, except a narrow strip in north of Iran, other parts of the country encounter desertification problem. In various studies, it has been found that a variety of factors affecting desertification and varies from climate to climate and region to region. So dealing with this phenomenon, especially in arid and semi-arid countries will be very useful and beneficial...

Solar radiation is the most important meteorological element which affects all climatological and biological processes such as evaporation and transpiration, snowmelt and plant growth directly and indirectly. Various planning in agriculture, hydrology, architecture and energy largely depend on the correct estimation of the amount of solar radiation. One of the most accurate methods in measuring solar radiation is using pyranometer which its usage is still limited in many parts due to the lack of facilities. Consequently, the researchers are trying more to estimate the radiation, instead of directly measuring it. Most of the previous studies have used Angstrom model, having the values of sunshine hours as its input, or regression equations through considering the climatic factors and elements affecting the radiation, to estimate the solar radiation. The aim of this study is to estimate and evaluate the spatial-temporal changes of receiving solar radiation in Kermanshah Province by using the "Bird and Hulstrom" model...

Drought is a creeping environmental phenomenon that has many damaging effects on the economy, agriculture and society. Drought is a situation of shortage of rainfall and incoming temperature increases that may occur in any climate. This phenomenon is in parts of eastern central and southern of Iran, due to dry and semidry weather will be more. The geographic distribution of droughts occurred in the percentage of the country shows that the southern and eastern areas of the country's is more extensive, and whatever from the southern and eastern parts of the country took distance the intensity and frequency of drought is also reduced. The reason for this is the impact of subtropical high-pressure systems that significant amount of the rainforest of South and Eastern parts in the country towards the northern and Western parts of the significantly reduced and prevents the effect of Northern and Western systems in these area...

Almost a half century has passed since the approval of the first master plan in Iran and since then these plans have been frequently criticized. Despite some defensible positive subjests, their inefficacy has been largely proved. This research does not intend to evaluate and criticize all issues and matters of urban plans in Iran, but to find and study some specific issues related to typomorphological approaches amongst this plans, emphasizing the urban development plans presented for Tabriz metropolis...