نتایج جستجو برای: water and wind erosion

تعداد نتایج: 16955916  

Journal: :Science 2000
S W Trimble P Crosson

No problem of resource or environmental management can be rationally addressed until its true space and time dimensions are known. The limitations of the universal soil loss equation and the wind erosion equation are such that we do not seem to have a truly informed idea of how much soil erosion is occurring in this country, let alone of the processes of sediment movement and deposition. The un...

Journal: :آب و خاک 0
سکینه پورمند احمد غلامعلی زاده آهنگر عبدالحمید دهواری

introduction: wind erosion is one of the most important factors in desert environments. prevailing winds can shift sand dunes and affect their accumulation and morphology. also, wind regime determines the direction of sand dune mobility in different ways. therefore, the wind regime, frequency, direction and velocity are supposed to be the most important factors to form the morphology of sand du...

Introduction: More than 168 countries face the phenomenon of land degradation and desertification. Land use changing and more exploitation of nature's potential in arid and semiarid ecosystems over the past three decades have increased the trend of desertification phenomena in these ecosystems. Deserts are dynamic ecosystems that are constantly evolving. Deserts are dynamic ecosystems that are ...

Journal: Desert 2019
M. Bazgir M. Mirhasani M. Tavakoli N. Rostami,

Wind erosion is considered as one of the main processes of land degradation in different parts of the world. Among the most effective ways to control wind erosion is to cover land surface with natural vegetation area. In this study, 3 replica soil samples were collected, at a depth of 0-3 cm, from various land uses in Dehloran, Ilam Province, Iran. Physical and chemical characteristics of soil ...

Journal: :مرتع و آبخیزداری 0
طیبه مصباح زاده دانشجوی دکتری بیابانزایی، دانشکده منابع طبیعی،دانشگاه تهران ،ایران حسن احمدی استاد گروه احیای مناطق خشک وکوهستانی ، دانشکده منابع طبیعی،دانشگاه تهران ،ایران غلامرضا زهتابیان استاد گروه احیای مناطق خشک وکوهستانی ، دانشکده منابع طبیعی،دانشگاه تهران ،ایران فریدون سرمدیان استادیار گروه مهندسی آب وخاک، دانشکده مهندسی آ ب وخاک، دانشگاه تهران ،ایران

investigation and preparing of wind erosion intensity maps are the main objectives of this research. in this research, the working unit map was prepared and then nine effective factors in wind erosion according to irifr.e.a model are determined at each of seven homogeneous units. according to the results, active sand dunes and landuse change showed the highest value with the rate of annual sedi...

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The purpose of this research is to analyze anemometer data to study the wind regime in Kashan and to investigate the role of different land uses in sand storms. Therefore, anemometer data obtained from synoptic station of Kashan were analyzed during a 40-year period (1966-2005) using different methods. Seasonal and annual wind roses and storm roses for different lands were created using WRPlot ...

Journal: Desert 2016
F. Amiraslani M. Hanifehpoor N. Mashhadi, Sh. Mohamadkhan

Aeolian process and subsequently soil erosion are key factors in dryland environments. Such phenomena are related not only to geoecological factors (lithology, topography, and climatology) but also to land-use and plant cover changes. Formation of new sand dunes in Damghan explains the development of human activities over the past. The aim of this study is to explain the land use changes and th...

Journal: :journal of agricultural science and technology 2011
i. angin a. v. yaghanoglu

erosion is considered as a main problem for the loss of arable land around the world. as the world arable land is reaching its limit, marginal areas, such as those prone to wind erosion, have gained importance for agricultural use. a simple and effective way of restoring wind eroded soils is addition of organic materials. sewage sludge can be an effective way to solve this problem. the effect o...

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...

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