نتایج جستجو برای: wind erosion index

تعداد نتایج: 504575  

1996
Larry E. Wagner

The Wind Erosion Prediction System (WEPS) is a process-based, daily time-step, computer model that predicts soil erosion via simulation of the fundamental processes controlling wind erosion. WEPS can calculate soil movement, estimate plant damage, and predict PM-10 emissions when wind speeds exceed the erosion threshold. It also can provide the user with spatial information regarding soil flux,...

The effects of vegetation on wind erosion, especially in arid areas, are known, but few studies have assessed the quantitative impact of plant species. The aim of this study was to investigate the effects of plant species on wind erosion and deposits. Three experimental sites were selected in Sebri, Iran. Two sites contained two plant species, Launaea spinosa and Lactuca serriola of different s...

Extended abstract Introduction Wind erosion is one the most important factors of land degradation in the arid and semi-arid areas and it is one the most serious environmental problems in the world. In Fars province, 17 cities are prone to wind erosion and are considered as critical zones of wind erosion. One of the most important factors in soil wind erosion is land use/cover change. T...

Journal: :مدیریت خاک و تولید پایدار 0
فاطمه ارزاقی دانشجو دانشگاه شهید چمران اهواز نعیمه عنایتی ضمیر هیات علمی/دانشگاه شهید چمران اهواز احمد فرخیان فیروزی هیات علمی/ دانشگاه شهید چمران اهواز

wind is an important erosive force in deserts, where limited cover of vascular plant material offers little soil-surface protection. erosion and sediment from soil surfaces occurs when wind forces exceed soil threshold friction velocities. soils with physical or biological crusts usually resist wind erosion. this study was conducted by the aim of investigation the effect of trichoderma harzianu...

Journal: :دانش آب و خاک 0
سید مرتضی ابطحی استادیار پژوهشی بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان اصفهان محمد خسروشاهی دانشیار پژوهشی بخش تحقیقات بیابان، مؤسسه تحقیقات جنگلها و مراتع کشور

nowadays, wind erosion and dust have become environmental problems, not only in desertareas, but throughout the entire country, which have imposed many costs on the country budget.combating wind erosion in many deserts using adapted plants and oil mulch has 40 years history.but the widespread use of petroleum mulches in addition to environmental problems is noteconomically justified due to the ...

In this research, the impact of a carbon sequestration project, in the Hossein Abad Plain in Southern Khorasan Province of Iran, on the status of water and wind erosion was evaluated. The study area has a harsh climatic condition with low annual precipitation and is prone to well-known 120-day winds in summer. Since 2005, various soil conservation treatments (plantations, over-sowing, plantatio...

2017
Simon van Donk Larry E. Wagner Edward L. Skidmore John Tatarko S. J. van Donk L. E. Wagner E. L. Skidmore J. Tatarko

Wind is the principal driver of the Wind Erosion Prediction System (WEPS), which is a process−based computer model for the simulation of wind−blown sediment loss from a field. WEPS generates wind using a stochastic wind generator. The objectives of this study were to improve the stochastic generation of wind speed and direction and to update the wind statistics used by the generator with statis...

2005
S. J. van Donk L. E. Wagner E. L. Skidmore J. Tatarko

Wind is the principal driver of the Wind Erosion Prediction System (WEPS), which is a process−based computer model for the simulation of wind−blown sediment loss from a field. WEPS generates wind using a stochastic wind generator. The objectives of this study were to improve the stochastic generation of wind speed and direction and to update the wind statistics used by the generator with statis...

Journal: :desert 2013
h. ahmadi m.a. saremi naeini m. yadegari

in order to recognize the wind erosion situation of a region, the survey of its windiness is not sufficient and the physical characteristics of earth are of importance too. in fact, the outbreak of dust storms in a region is due to the sensitivity of earth and domination of wind in that region. in this investigation we have tried to find a way for determining the regions in which a dust storm i...

Journal: :desert 0
h. ahmadi professor, science and research branch, islamic azad university, tehran, iran m.a. saremi naeini msc graduate, university of teheran, karaj, iran m. yadegari retired engineer, abadan refinery, abadan, iran

in order to recognize the wind erosion situation of a region, the survey of its windiness is not sufficient and the physical characteristics of earth are of importance too. in fact, the outbreak of dust storms in a region is due to the sensitivity of earth and domination of wind in that region. in this investigation we have tried to find a way for determining the regions in which a dust storm i...

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