Physical Geography Research
Year:2017 | Volume:49 | Issue:2 |Papers Count:13

Introduction: The west and southwest areas of Iran are characterized by high-levels of dust events mainly due to their location in the vicinity of vast deserts. Western Iran is located in the vicinity of some important dust sources: the Tigris and Euphrates basin in Iraq as well as Syria in the west and the Arabian Peninsula in the south. These sources are among the most active in the dust belt, especially in the recent years. …

Introduction: Changes in rainfall regime can represent the effects of climate change. Reduction and increase in rainfall affect many environmental phenomena such as runoff, air temperature, humidity, and also many human activities including agriculture and housing. On the other hand, the growing need for understanding climatic characteristics is essential for human life. Increasing climate information has helped understand the climatic characteristics in different regions. Therefore, use of new classification methods seems inevitable. One of the most widely used methods is cluster analysis classification recently used extensively in climate zoning. …

Introduction: More than 30 percent of the Earth is covered by seasonal snow and about 10 percent by permanent glaciers. Approximately about 5 percent of global precipitation is snow. About 50 to 95 percent of the value is in polar areas. Spatial-temporal distribution of snow is important. The estimation of snow cover area provides valuable information on snow-melting water in terms of runoff and water supply of the watershed in mountainous regions. …

Introduction: With 6.8 percent oil reservoirs, Zagros is one of the most prolific oil sedimentary basins. The greater part of its hydrocarbon reservoirs are concentrated in anticlinal traps. They are also the subsets of the structural traps. In addition to rich and vast hydrocarbon reservoirs, Zagros have been also considered in terms of its Neotectonic activities. The studies of neotectonic activities are important in control of landforms in tectonic regions, apart from its social and economic interests. …

Introduction: Nowadays, along with other social and cultural attractions, the geomorphological and climate attractions have the special importance for economic studies and policy making. Geotourism is a new approach to explain the earth planet and its natural capital. In addition to educational and scientific roles, it can cause development of regional tourism and offer strategies for sustainable development in the geotourism sites. …

Introduction: Debris and rocky hillsides are one of the important and typical landforms in arid and semi-arid regions. In this study, the relation between the hardness of Aghajari sandstone with producing the debris has been surveyed by Selby Method. The sandstone rocks display obviously landscape features. Debris is one of these landscapes. Rock fall and rock topple can create these landscapes. …

Introduction: Climate changes and global warming as important issues in environmental sciences have attracted the attention of many researchers. In the study of the climate and atmospheric changes, it is essential to understand the temporal conditions of climate parameters, particularly degree day. …

Introduction: Linking global climate models with local scale as a micro climatic process is of great importance. Recently, many attempts have been made by researchers to develop dynamics and statistical downscaling methods for expressing climate change at a local and regional scale. Two general techniques are used for downscaling of the output of General Circulation Models (GCM). …

Introduction: Global warming and climate change have been identified as the most important challenges of the current century. Methane as one of the most important greenhouse gasses accounted for about 18% of the total increase in radiative forcing due to long-lived greenhouse gases in the atmosphere. The average CH4 concentration (XCH4) was 1808 ppb in 2010. …

Introduction: In the recent years, due to the benefits of conservation tillage and also disadvantages of crop residue burning, extension and education of conservation tillage has been highlighted on the agenda of agriculture policymakers. In this regard, subsidies or crimes are, respectively, considered for the farmers who use conservation tillage or crop residue burning on their farms. …

Introduction: In recent years, urban developments have created changes in the climate. Such changes affected the sustainability of the natural environment and the rate people's health is affected, especially in cities. If the human body is an environment warmer so that skin surface begins to absorb the heat and in the colder environment gradually loses its heat. …