نتایج جستجو برای: soil erosion model

تعداد نتایج: 2282732  

Journal: :مرتع و آبخیزداری 0
حشمت اله آقارضی عضو هیئت علمی مرکز تحقیقات کشاورزی و منابع طبیعی استان مرکزی مهدی مردیان دانشجوی دکتری آبخیزداری دانشگاه علوم کشاورزی و منابع طبیعی ساری علی اکبر داوودی راد دانشجوی دکتری آبخیزداری دانشگاه تربیت مدرس و عضو هیئت علمی مرکز تحقیقات کشاورزی و منابع طبیعی استان مرکزی داوود نیک کامی دانشیار پژوهشکدة حفاظت خاک و آبخیزداری

land use optimization using linear programing is a method in watershed management for access to production sustainability and decreasing of soil erosion. the sensitivity analysis of the model can with investigation of results influence form changes in input parameters, lead to decrease the uncertainty in decision-making of management programs. so in this research, linear programming model using...

1- INTRODUCTION According to the complexity of environmental factors related to erosion and runoff, correct simulation of these variables find importance under rain intensity domain of watershed areas.  Although modeling of erosion and runoff by Artificial Neural Network and Neuro-Fuzzy based on rainfall-runoff and discharge-sediment models were widely applied by researchers, scrutinizing Arti...

2010
John D. Williams Erin S. Brooks

Computer simulation models are essential tools for evaluating soil erosion potential over large areas of cropland. Small-plot and field-scale evaluations are commonly conducted for federal farm program compliance, but producers are now faced with off-farm water quality concerns. Predicting the potential contribution of upland sediment is of interest to producers and state and federal agencies. ...

2007
G. J. Hanson S. L. Hunt

Overtopping, internal erosion, and piping are the main causes of accidents and failures of embankments for dams, lagoons, and levees. A key parameter in the failure of these structures is the erodibility of the soil materials used in construction of the embankments. The soil materials are typically constructed based on compaction specifications. The jet erosion test (JET) has been developed to ...

Journal: :مرتع و آبخیزداری 0
راضیه صفی یاری دانشجوی کارشناسی ارشد مهندسی علوم خاک، دانشگاه تهران فریدون سرمدیان استاد دانشکدة مهندسی علوم خاک، دانشگاه تهران احمد حیدری دانشیار دانشکدة مهندسی علوم خاک، دانشگاه تهران شیرین یونسی دانشجوی کارشناسی ارشد مهندسی علوم خاک، دانشگاه تهران

evaluation soil erosion is an important matter to protecting it from destroying in future due to the excessive use of the inherent capacity of soil and also improper management. therefore, in this study land vulnerability related to water and wind erosion of abyek for crops and pasture land has been evaluated, using raizal model as one of the microleis sub-models. morphological and physical and...

ژورنال: علوم آب و خاک 2014
بهره‌مند, عبدالرضا, زینی‌وند, حسین, مرادی‌پور, شهین, نجفی‌نژاد, علی,

Evaluation of hydrologic behaviour and soil erosion as an environmental crisis is important in order to maintain watershed ecological safety at optimum level. The aim of this study is to evaluate the performance of the distributed hydrological WetSpa model in simulating erosion and sediment transport and also sedigraph in Taleghan watershed, Iran. Base digital maps and daily meteorological time...

2006
R. Cory Greer Joan Q. Wu Prabhakar Singh Donald K. McCool

The Palouse area of the Northwestern Wheat and Range Region suffers high erosion throughout the winter season. The excessive soil loss is a result of a combination of winter precipitation, intermittent freezing and thawing of soils, steep land slopes, and improper management practices. Soil strength is typically decreased by the cyclic freeze and thaw, particularly during the period of thawing....

2015
David Jon Muth David J. Muth Eliot Winer Xinwei Wang Douglas Karlen Arne Hallam

Agricultural residues have been identified as a significant potential resource for bioenergy production, but serious questions remain about the sustainability of harvesting residues. Agricultural residues play an important role in limiting soil erosion from wind and water and in maintaining soil organic carbon. Because of this, multiple factors must be considered when assessing sustainable resi...

2017
Marcin K. Widomski

Soil erosion by water is commonly recognized as the one of main reasons of land degradation worldwide (e.g. Ananda & Herath, 2003; Beskow et al., 2009; Valentin et al., 2005). Most of the involved areas are occupied by various agricultural activities but pastures, forestry, unpaved roads as well as construction sites are also endangered by water erosion (Ananda & Herath, 2003; Arnanez et al., 2...

Soil erosion is one of the most important environmental issues in developing countries, including Iran that there is inaccurate information about its amount and distribution. For this purpose, the accuracy and distribution of erosion classes obtained from EPM and MPSIAC models as compared to BLM as ground truth values were evaluated in Shahriari watershed. First, the required data and informati...

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