نتایج جستجو برای: erosion

تعداد نتایج: 30410  

Journal: :مدیریت خاک و تولید پایدار 0
سهیلا پویان دانش آموخته دانشگاه شیراز مریم میراکبری دانش آموخته دانشگاه شیراز سید فخرالدین افضلی استادیار دانشگاه شیراز

wind erosion climatic factor is a measure of climatic factors explaining the wind erosion erosivity. humidity and wind speed are climatic characteristics that must be considered as the erosion parameters. in this study, linear moment analysis (l-moments) and wind erosion climatic factor were used to evaluate the regional climate’s tendency effect on wind erosion in yazd province. wind erosion c...

Journal: :Urology journal 2012
Sanjay Sinha Rooma Sinha Jyotsna B Reddy Srinivas R Sirigiri Srinivas K Kanakamedala

INTRODUCTION Urethral erosion is an uncommon, but serious complication following syndiscuss a woman who presented with urethral erosion, vaginal erosion, ment. She was managed by sling excision with simultaneous rectus fascia sling surgery. Most such patients have been managed by urethral reconstruction and subsequent staged incontinence surgery, for fear of urethral complications. We thral ero...

Journal: :desert 0
m. nasri assistant professor, islamic azad university of ardestan, ardestan, iran s. feiznia professor, university of tehran, karaj, iran m. jafari professor, university of tehran, karaj, iran h. ahmadi professor, islamic azad university, science and research branch, tehran, iran

the problems of land degradation and soil loss are among the major problems of watersheds in iran. for erosion andsediment estimation one can use statistical and empirical methods. for doing this, land unit map and the map of effectivefactors should be prepared. for erosion and sediment estimation one can use statistical and empirical methods. however,these empirical methods are usually time co...

Journal: :General dentistry 2014
Mohamed A Bassiouny

The vast number and variety of erosion lesions encountered today require reconsideration of the traditional definition. Dental erosion associated with modern dietary habits can exhibit unique features that symbolize a departure from the decades-old conventional image known as tooth surface loss. The extent and diversity of contemporary erosion lesions often cause conflicting diagnoses. Specific...

2001
Clifford S. Riebe James W. Kirchner Darryl E. Granger Robert C. Finkel

The relationships among climate, physical erosion, and chemical weathering have remained uncertain, because long-term chemical weathering rates have been difficult to measure. Here we show that long-term chemical weathering rates can be measured by combining physical erosion rates, inferred from cosmogenic nuclides, with dissolution losses, inferred from the rock-to-soil enrichment of insoluble...

2009
W. J. Elliot R. B. Foltz P. R. Robichaud

Sediment is the greatest pollutant of forest streams. In the absence of wildfire, forest road networks are usually the main source of sediment in forest watersheds. An understanding of forest road erosion processes is important to aid in predicting sediment delivery from roads to streams. The flowpath followed by runoff is the key to understanding road erosion processes. On rutted roads, the fl...

Journal: :international journal of agricultural science, research and technology in extension and education systems 2012
reza talaei farzaneh azimi seyed ahmad hosseini

an erosion hazard index methodology (ehim) was developed for assessing stream erosion. the index of stream erosion is designed as a management tool. assessing stream erosion involves consideration of a range of aspects of streams and a value judgment about a desirable state. the assessment of the erosion indicators of streams was based on a state-wide assessment of physical stream condition. a ...

2004
A. Gobin R. Jones M. Kirkby P. Campling G. Govers C. Kosmas

Soil erosion forms a major threat to European soil resources. Although soil is a vital and largely non-renewable resource, it has not been the subject of comprehensive EU action so far. A thematic strategy for soil protection, which recognises soil erosion as one of the major threats, has currently been placed high on Europe’s political Agenda. Assessing and monitoring soil erosion is needed to...

2009
Jorge Pacheco Allan Kidd

This paper presents a method for estimating the potential for liquid droplet erosion in compression system components, such as the impeller of centrifugal compressors. The erosion model selected is used to calculate a threshold velocity that represents the limit for the onset of erosion damage. The parameters used in the model include the liquid phase density and viscosity, impeller geometry, s...

2008
YUAN Lifeng

It is of great significance to dynamically simulate and forecast the development and evolutionary of soil erosion process. Traditionally, most of soil erosion models are essentially steady-state models. Thus, they have limitations at real-time simulation on the initiation and development of soil erosion process. Cellular Automata (CA), with a “from down to up” dynamic modeling framework, is cap...

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