نتایج جستجو برای: moments and wind erosion climatic factor were used to evaluate the regional climates tendency effect on wind erosion in yazd province wind erosion climatic factor is calculated from wind speed quantiles
تعداد نتایج: 25568089 فیلتر نتایج به سال:
One of the main causes of air pollution in the arid areas of world, especially in Iran, is the increase of the PM10 concentration. The main objective of this research is to identify the most important climatic factors affecting the change of PM10 concentration near Yazd-Ardakan plain and its relation with wind erosion occurrence during the period from 2012 to 2017. For this purpose, the monthly...
In the United States, the USDA Natural Resources Conservation Service (NRCS) is the primary agency charged with the task of reducing wind erosion associated with production agriculture. The NRCS has used the Wind Erosion Equation (WEQ) (Woodruff and Siddoway, 1965) to assess the effects of field management on the potential for wind erosion for the last two and a half decades. The WEQ uses input...
Aims & Backgrounds: Considering the fact that a large part of our country is in arid and semi-arid regions and every year wind erosion and dust storms cause significant damages to the country's bio-economic resources, it is necessary to study this phenomenon. This study investigated the erosion rate of geomorphological facies of Gonabad city in relation to wind erosion. Methodology: The wind er...
there are many reports of serious problems of dust storm events in the western parts of iran. based on many researches, iraq is one of the main sources of dust storms in western parts of iran. the radial basis function network (rbfn) model has been used to assess wind erosion hazard in iraq as a main source area of dust storms over several western cities of iran. the percentage of vegetation is...
Introduction: Wind erosion results from desertification in arid and semi-arid regions and is intensified by any decrease in rainfall and vegetation. Sistan region, located in southeastern Iran, has been exposed to severe wind erosion and dust storms for about 23 years as a result of frequent and prolonged drought in the region and desiccation of Hamoun lakes. Therefore, finding appropriate meth...
wind erosion is a major environmental issue affecting land resources and socio-economic settings in iran. this paper outlines a study undertaken to provide a new tool to manage wind erosion from physical and economic perspectives. the southern part of the varamin plain in south of tehran is used as a case study. the focus of this study is on exploring the economic and physical impacts of 16 veg...
Wind erosion is important in areas with less than 150 mm of rainfall Measuring the extent and severity of wind erosion in many countries, including Iran, there is no station to measure wind erosion sediments and so the deposition estimation methods rely on empirical models so that in many cases there are measurement errors. With estimates wind and water erosion and deposition potential compared...
The majority of Iran’s area is covered by arid and semiarid climates. In these areas, wind causes more erosion compared to water. Therefore, determination of wind characteristics especially its velocity is very important. One of the simplest methods that can supply researchers with the origin of wind erosion in the shortest time is synthesizing sand rose model and interpretation of aerial photo...
Introduction: Wind erosion and the influx of sandy soils to economic facilities and biological resources are one of the main problems in the country. 14 provinces, located in arid and semi-arid regions, face wind erosion. Wind erosion and the influx of sandy soils are two important indicators in the occurrence of desertification and a serious threat to arid areas. The best and lasting way to pr...
the ability of composing a coherent and extended piece of writing in second language is considered as a fundamental factor to convey information and ideas of learners through the academic issues. although learners may achieve a perfect academic writing skill through assigning the l2 tasks in content based instruction, but demonstration of their abilities may be related to their ability in l1 es...
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