نتایج جستجو برای: usle

تعداد نتایج: 323  

2002
Renata Chmelová Bořivoj Šarapatka

According to a UN Environment Programme survey, topsoil is eroding faster than it forms on about one third of the world’s cropland, causing an estimated 85 % of the world s land degradation from human activities. Erosion of soil, mainly by water, is also a problem in the Czech Republic where 54 % of arable land is endangered by water erosion. The topic of this article is to describe contemporar...

Journal: :Int. J. Applied Earth Observation and Geoinformation 2010
Katrin Meusburger Nadine Konz Monika Schaub Christine Alewell

The focus of soil erosion research in the Alps has been in two categories: (i) on-sitemeasurements, which are rather small scale point measurements on selected plots often constrained to irrigation experiments or (ii) off-site quantification of sediment delivery at the outlet of the catchment. Results of both categories pointed towards the importance of an intact vegetation cover to prevent soi...

Journal: :journal of agricultural science and technology 2010
a. r. vaezi h. a. bahrami s. h. r. sadeghi m. h. mahdian

the soil erodibility factor varies spatially according to variations of some soil properties on the surface. this study was carried out to compare spatial variability of the soil erodibility factor as estimated and measured using the usle. the study was conducted in an agricultural zone with an area of in 900 km2 in hashtrood, northwestern iran. in the study area, 36 square grids with a dimensi...

Journal: :Acta Agronómica 2021

La erosividad de la lluvia (R) es uno los factores incluidos en Ecuación Universal Pérdida Suelo (USLE) y se define como capacidad potencial para erosionar suelos, cuyo conocimiento fundamental planificación del uso manejo mismos. En el presente trabajo evaluaron dos métodos (USLE-EI30 EI30cor) determinar factor R principales municipios productores piña Valle Cauca, además, analizaron índices F...

Journal: :Computers & Geosciences 2013
Hongming Zhang Qinke Yang Rui Li Qingrui Liu Demie Moore Peng He Coen J. Ritsema Violette Geissen

The Universal Soil Loss Equation (USLE) and revised USLE (RUSLE) are often used to estimate soil erosion at regional landscape scales, however a major limitation is the difficulty in extracting the LS factor. The geographic information system-based (GIS-based) methods which have been developed for estimating the LS factor for USLE and RUSLE also have limitations. The unit contributing area-base...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز 1379

پیش بینی و تخمین فرسایش و رسوب، به دلیل مشکلاتی که در اندازه گیری مستقیم وجود دارد، غالبا توسط مدلها صورت می گیرد. یکی از راههای تخمین رسوب حاصل از فرسایش، استفاده از مدلهای متوسط می باشد. مدلهای ‏‎usle‎‏ و ‏‎usle-m‎‏ ای عمده ترین این مدلها می باشند. معادله جهانی فرسایش ‏‎(usle)‎‏ در بسیاری از کشورها به منظور برآورد مقدار فرسایش بکاربرده می شود. مدل ‏‎usle-m‎‏ اصلاح شده مدل ‏‎usle‎‏ است که در آ...

Journal: :Water 2023

A reliable prediction of event soil loss at the plot scale can be obtained by Universal Soil Loss Equation (USLE)-type models. For Sparacia site (South Italy), USLE-MB model was recently developed, in which effect erosive agent is modeled using rainfall erosivity index USLE a power b1 > 1 runoff coefficient QR. In this investigation, parameterized separately data collected for rill and inter...

2015
F. Todisco L. Brocca W. Wagner

The potential of coupling soil moisture and a Universal Soil Loss Equation-based (USLE-based) model for event soil loss estimation at plot scale is carefully investigated at the Masse area, in central Italy. The derived model, named Soil Moisture for Erosion (SM4E), is applied by considering the unavailability of in situ soil moisture measurements, by using the data predicted by a soil water ba...

2006
YUNHAO CHEN XIAOBING LI PEIJUN SHI ADU GONG WEN DOU

A remote sensing approach towards modelling the land cover pattern for controlling local soil erosion based on the universal soil loss equation (USLE) was developed. The approach was used to analyse the possible impact of land cover changes on local ecological security. Then, land cover pattern optimization aiming at the reduction of local soil erosion was taken. Results show that this method c...

Journal: :Hydrology 2021

Soil erosion is a globally challenging issue that hinders agricultural productivity by enhancing land degradation and loss to the top fertile soil. Although it global issue, its effect adverse on farmers dwell in developing countries. Hence, providing information soil crucial plan implement appropriate water conservation measures. Accordingly, estimation models were developed grouped as empiric...

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