نتایج جستجو برای: depth of erosion

تعداد نتایج: 21173270  

2006
Jon D. Pelletier

The geometry of foreland basins is controlled by a dynamic balance between thrust-belt migration, fl exural subsidence, and fl uvial deposition. To improve our ability to quantify the relationships between tectonics, climate, and foreland basin geometry, I developed analytic solutions for basin topography and stratigraphy using a classic two-dimensional mathematical model of foreland basin evol...

Journal: :Journal of experimental marine biology and ecology 2000
Hibino van Woesik R

This study sought to understand short-term spatial changes in accretion and erosion on (experimental) carbonate blocks on three coral reefs of the Ryukyu Islands, Japan. The principal objectives were to differentiate net accretion/erosion according to season, location, depth and substrate-type. At all locations the summer season showed more positive net weight changes and higher coralline algal...

2013
P. J. Borkowski J. A. Borkowski

The paper presents a novel method for the 3D shaping of different materials using a high-pressure abrasive water jet and a flat target image. For steering movement process of the jet a principle similar to raster image way of record and readout was used. However, respective colors of pixel of such a bitmap are connected with adequate jet feed rate that causes erosion of material with adequate d...

اسدزاده, فرخ, میرزایی, سلمان, نظرنژاد, حبیب ,

Resistance to surface flow such as Manning's and Darcy-Weisbach rouphness coefficients were an important input for estimating soil erosion by soil erosion process models. Also, it is very important for designing and implementing soil and water conservation practices. The objective of present research was predicting Manning's and Darcy-Weisbach rouphness coefficients in surface of a loess soil u...

2015
D. O. Appiah

The object of this paper is to analyse the sedimentologic characteristics of old and new terrace sediments from the Pawmpawm River channel. The morphometric characteristics of the terrace materials give credence to the hydrologic dynamics of the river as it performs its core functions of erosion, transportation and deposition with time. The terrace materials are evidenced from their petrographi...

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: :تحقیقات جغرافیایی 0
علیرضا حبیبی پژوهشکده آبخیزداری

soil erosion is a major problem for developing countries with arid and semi-arid climate. these of erosion is possible than two ways of water and wind. in this paper, with using of two methods irifer and hierarchical models, the rate and intensity of of soil erosion is estimated shadegan catchment. for this purpose, by using various maps alike dem, rainfall, land use index, ndvi, geology estima...

Journal: :جنگل و فرآورده های چوب 0
علیرضا پژوهنده دانشجوی کارشناسی ارشد، گروه خاک شناسی، دانشگاه آزاد اسلامی ‏‏واحد کرج، کرج، ایران ویلما بایرام‏‏زاده استادیار، گروه صنایع چوب و کاغذ، ‏‏دانشگاه آزاد اسلامی ‏‏واحد کرج، کرج، ایران وحید رضا صفدری استادیار، گروه صنایع چوب و کاغذ، ‏‏دانشگاه آزاد اسلامی ‏‏واحد کرج، کرج، ایران منوچهرخان زرین کفش استاد، گروه خاک شناسی، دانشگاه آزاد اسلامی ‏‏واحد کرج، کرج، ایران

anatomical changes of the exposed roots in cupressus sempervirens l. var horizontalis were used toestimate soil erosion in hassan abad valley, chaloos, iran. a total of 30 exposed roots, for five trees,were used to estimate erosion. cross-sections of 20 μm were papered and the first year of exposure byerosion was identified. we finally estimated the mean annual erosion. the statistical relation...

پایان نامه :دانشگاه تربیت معلم - تبریز - دانشکده علوم پایه 1391

عنوان پایان نامه:بررسی عمق توانهای ایده آل یالی یک درخت فرض کنیدg یک گراف با n رأس و i(g) ایده آل یالی آن از حلقه چند جمله ایها،r=k[x1,x2,…,xn]،روی میدانk با nمتغیر باشد. فرض کنید i ایده آل یالی یک درخت یا جنگل باشد. در این پایان نامه کرانهای پایینی برای دنباله {depth rit}t?1 بدست می آوریم و نشان می دهیم این کرانهای پایین، نقطه ایستایی دنباله 1? {depth rit}tاست هرگاه g یک درخت باشد.

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