نتایج جستجو برای: wind erosion data
تعداد نتایج: 2499239 فیلتر نتایج به سال:
Representation of surface roughness effects on aeolian sediment transport is a key source of uncertainty in wind erosion models. Drag partitioning schemes are used to account for roughness by scaling the soil entrainment threshold by the ratio of shear stress on roughness elements to that on the vegetated land surface. This approach does not explicitly account for the effects of roughness confi...
interpolation, the generalization of point data to scatter data, and combining maps are three cases of important applications of gis. in this study, it has been tried to make the estimation of rain erosion capacity (fournier method) more real through using gis capability in interpolation and the generalization of point data to scatter data. in fournier method, the rain erosion capacity is calcu...
Extended abstract 1- Introduction Threshold wind velocity is a major influencing variable in transportation of soil particles and dust production. It is considered as an important component in many theoretical equations and numerical models due to its importance in wind erosion studies (Stout & Zobeck, 1996). The wind tunnel method (fixed and portable), empirical relationships and sediment tr...
Nebkhas, which are formed by shrubs, are a common phenomenon in arid and semiarid landscapes and play important roles in preventing soil erosion and nutrient loss. Halocnemum strobilaceum is one of the important indigenous plant species of Mighan playa that can not only protects itself against wind erosion but also reduces sediment removal and can forms Nebkha phenomenon. This study aims at exa...
Due to population growth, global warming, changing precipitation patterns, and decreasing precipitation, water and soil are two of the most important human issues. Water and soil resources management in arid and semi-arid regions is one of the methods that can solve water and soil issues. Covering the soil surface with permeable natural materials can reduce water and wind erosion and evaporatio...
the main objective of this study is evaluation and wind statistic analysis, investigation of wind regime role on discharge flow and direction of sediments transferring in the case study. thus, sabzevar station anemometer data duration 10 years statistic period (1996-2005) analyzed. sand drift potential amount of study area is 160.9 v.u and result drift directionâ is west as well as sand flux is...
In the long-term, wind erosion has considerable impact on rangelands. The aim of this study is to understand the changes of Hanitiyeh Rangelands located 30 kilometers east of Ahvaz and its function. Two transects, 42 meters in length, in wind gradient, patch and inter patch with 5 repeats that included shrub log complex, bush, grass, shrub, shrub-grass and bare open soil were measured. In addit...
Inner Mongolia is located in the north of China, where the development of wind power industry is outstanding. Because of the surrounding environment’s destruction by frequent sandstorm phenomena in recent years, wind fan blades are severely damaged. The purpose of this paper is to use PLC and touch screen to realize quantitative content of sediment erosion wear in accurate control. The whole te...
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