نتایج جستجو برای: soil erosion rate

تعداد نتایج: 1149257  

2009
Aixia LIU Junfeng CHEN Jing WANG Zhengjun LIU

The Donghe basin is one of the typical regions with serious water and soil erosion in Kaixian county of China. In this study the spatial distribution variation of soil erosion in Donghe basin is analyzed based on a comprehensive method that integrates SWAT model with a Geographic Information System and remote sensing technologies and the effects of land use changes on soil erosion is also analy...

2003
CLIFFORD S. RIEBE JAMES W. KIRCHNER ROBERT C. FINKEL

Quantifying long-term rates of chemical weathering and physical erosion is important for understanding the long-term evolution of soils, landscapes, and Earth’s climate. Here we describe how long-term chemical weathering rates can be measured for actively eroding landscapes using cosmogenic nuclides together with a geochemical mass balance of weathered soil and parent rock. We tested this appro...

Journal: :ISPRS International Journal of Geo-Information 2020

2006
Berhanu Gebremedhin Scott Swinton

Farmers must perceive soil erosion as a problem before they will invest in preventing it. However, perceptions are often overlooked in the conservation literature. This study analyzes the levels and determinants of farmer perceptions of soil erosion in northern Ethiopia. Results are based on a survey of 250 farmers managing 900 fields during the 1995-96 cropping season. Farmer perceptions of th...

2001
Dhruba Pikha Shrestha

Soil erosion is a crucial problem in Nepal where more than 80% of the land area is mountainous and still tectonically active. Although deforestation, overgrazing and intensive agriculture, due to population pressure, have caused accelerated erosion, natural phenomena inducing erosion, such as exceptional rains, earthquakes and glacial-lake-outburst flooding in the high Himalayas are also common...

Journal: :Environmental Modelling and Software 2004
Lawrence J. Hagen

This study represents part of a project by the Global Change and Terrestrial Ecosystem Soil Erosion Network to validate wind erosion models. Soil loss measurements from 46 storm events from eroding fields in six states were compared to predictions from the Wind Erosion Prediction System (WEPS) erosion submodel. The field data were collected from small (2.5 ha), circular, cropland fields with no...

Journal: :International Journal of Geographical Information Science 2013
L. Ai N. F. Fang B. Zhang Z. H. Shi

Soil erosion poses a serious problem for sustainable agriculture and the environment. There is a need to develop a simple and practical approach for broad area mapping of soil erosion risk that uses the uncertain but available information as input data within the constraints of reasonable cost and time. In this work, a predictive approach for conducting analytical erosion risk assessment across...

ژورنال: علوم آب و خاک 2018

Nowadays application of soil conditioners for mitigation and reduction of runoff is a current method. Considering the advantages of Polyacrylamide (PAM), this study was arranged to evaluate impacts of this soil conditioner on soil infiltration rate, runoff and erosion control. To fulfill the goal, a factorial experiment in a completely randomized design was carried out with four PAM treatments ...

ژورنال: علوم آب و خاک 2020

Few studies have been done regarding the role of the raindrop in the hydrodinamic mechanism of soil erosion. In this study, rainfall simulation experiments were conducted to evaluate the role of raindrop in runoff discharge, sediment concentration and hydraulic properties of flow under four slope gradients (5, 10, 15 and 20%) in a clay soil using a 90 mm.h-1 rainfall intensity to reach the stea...

2017
Nicolas Derungs Ellen Hertz

Switzerland’s 2014 “Agricultural Report” asserts that the fertility of Swiss agricultural lands is compromised in the long term, and that one of the major causes is water erosion. Yet, the problem of soil erosion is not recent. It has been studied for more than fifty years and included in agroenvironmental policy-making for more than twenty years. However, despite significant improvements, expe...

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