Threshold friction velocity and soil loss across different land uses in arid regions: Iran

2019 ◽  
Vol 12 (3) ◽  
Author(s):  
Marzieh Mirhasani ◽  
Noredin Rostami ◽  
Masoud Bazgir ◽  
Mohsen Tavakoli
Keyword(s):  
Soil Loss ◽  
Arid Regions ◽  
Friction Velocity ◽  
Land Uses ◽  
Threshold Friction Velocity

A meta-analysis of the effects of land management practices and land uses on soil loss in Ethiopia

2021 ◽  
Vol 322 ◽  
pp. 107635
Author(s):  
Gizaw Desta ◽  
Wuletawu Abera ◽  
Lulseged Tamene ◽  
Tilahun Amede
Keyword(s):  
Land Management ◽  
Soil Loss ◽  
Management Practices ◽  
Meta Analysis ◽  
Land Uses

scholarly journals EFFECTIVE PRECIPTATION, SOIL LOSS AND PLANT COVER SYSTEMS IN THE CAATINGA BIOME, BRAZIL

2016 ◽  
Vol 29 (4) ◽  
pp. 956-965
Author(s):  
HELBA ARAÚJO DE QUEIROZ PALÁCIO ◽  
JACQUES CARVALHO RIBEIRO FILHO ◽  
JÚLIO CÉSAR NEVES DOS SANTOS ◽  
EUNICE MAIA DE ANDRADE ◽  
JOSÉ BANDEIRA BRASIL
Keyword(s):  
Water Depth ◽  
Soil Loss ◽  
Plant Cover ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Land Uses ◽  
Forest Region ◽  
Caatinga Biome ◽  
Cover Systems ◽  
Precipitation Events

ABSTRACT The objective of this work was to evaluate the influence of anthropic activities on the effective precipitation (eP) and soil loss in watersheds under different land uses in a tropical dry forest region. The experimental area was located in the central part of the State of Ceará, Brazil. The land uses evaluated were: fallow Caatinga (FC), thinned Caatinga (TC) and deforested Caatinga followed by a burning procedure and pasture cultivation (DBP). The areas were monitored in the rainy season (January to May, 2010), when 57 natural rainfalls occurred, totaling 941 mm of precipitation. The eP and sediment productions were quantified by the sum of all occurrences during the study period, and the soil loss was represented by suspended and dragged sediments. The eP was 15.13 mm and sediment produced was 167.81 kg ha-1 in FC conditions. The eP values was smaller (11.28 mm) in the watershed with TC, which had soil loss sum of 42.04 kg ha-1. The largest annual eP was found in the DBP area, with 112.88 mm yr-1 of accumulated water depth, which also showed the greater annual soil loss (3114.97 kg ha-1). The greatest interference of plant cover in the two variables evaluated occurred in the first precipitation events, when the plants were not yet fully developed.

scholarly journals Multitemporal analysis of estimated soil loss for the river Mourão watershed, Paraná – Brazil

2015 ◽  
Vol 75 (4 suppl 2) ◽  
pp. 120-130 ◽  
Author(s):  
C. H. Graça ◽  
F. H. Passig ◽  
A. R. Kelniar ◽  
M. A. Piza ◽  
K. Q. Carvalho ◽  
...  
Keyword(s):  
Soil Loss ◽  
Water Erosion ◽  
Surface Erosion ◽  
Western Region ◽  
Land Uses ◽  
Geography Information System ◽  
Hydrographic Basin ◽  
Gis Environment ◽  
Geography Information ◽  
Soil Loss Equation

The multitemporal behavior of soil loss by surface water erosion in the hydrographic basin of the river Mourão in the center-western region of the Paraná state, Brazil, is analyzed. Forecast was based on the application of the Universal Soil Loss Equation (USLE) with the data integration and estimates within an Geography Information System (GIS) environment. Results had shown high mean annual rain erosivity (10,000 MJ.mm.ha–1.h–1.year–1), with great concentration in January and December. As a rule, soils have average erodibilities, exception of Dystroferric Red Latisol (low class) and Dystrophic Red Argisol (high class). Although the topographic factor was high (>20), rates lower than 1 were predominant. Main land uses comprise temporal crops and pasture throughout the years. The watershed showed a natural potential for low surface erosion. When related to usage types, yearly soil loss was also low (<50 ton.ha–1.year–1), with more critical scores that reach rates higher than 150 ton.ha–1.year–1. Soil loss over the years did not provide great distinctions in distribution standards, although it becames rather intensified in some sectors, especially in the center-eastern and southwestern sections of the watershed.

scholarly journals Estimating Human Impacts on Soil Erosion Considering Different Hillslope Inclinations and Land Uses in the Coastal Region of Syria

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2786 ◽  
Author(s):  
Safwan Mohammed ◽  
Hazem G. Abdo ◽  
Szilard Szabo ◽  
Quoc Bao Pham ◽  
Imre J. Holb ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Land Cover ◽  
Soil Loss ◽  
Agricultural Land ◽  
Human Impacts ◽  
Coastal Region ◽  
Water Erosion ◽  
Land Uses ◽  
Erosion Processes

Soils in the coastal region of Syria (CRoS) are one of the most fragile components of natural ecosystems. However, they are adversely affected by water erosion processes after extreme land cover modifications such as wildfires or intensive agricultural activities. The main goal of this research was to clarify the dynamic interaction between erosion processes and different ecosystem components (inclination, land cover/land use, and rainy storms) along with the vulnerable territory of the CRoS. Experiments were carried out in five different locations using a total of 15 erosion plots. Soil loss and runoff were quantified in each experimental plot, considering different inclinations and land uses (agricultural land (AG), burnt forest (BF), forest/control plot (F)). Observed runoff and soil loss varied greatly according to both inclination and land cover after 750 mm of rainfall (26 events). In the cultivated areas, the average soil water erosion ranged between 0.14 ± 0.07 and 0.74 ± 0.33 kg/m2; in the BF plots, mean soil erosion ranged between 0.03 ± 0.01 and 0.24 ± 0.10 kg/m2. The lowest amount of erosion was recorded in the F plots where the erosion ranged between 0.1 ± 0.001 and 0.07 ± 0.03 kg/m2. Interestingly, the General Linear Model revealed that all factors (i.e., inclination, rainfall and land use) had a significant (p < 0.001) effect on the soil loss. We concluded that human activities greatly influenced soil erosion rates, being higher in the AG lands, followed by BF and F. Therefore, the current study could be very useful to policymakers and planners for proposing immediate conservation or restoration plans in a less studied area which has been shown to be vulnerable to soil erosion processes.

scholarly journals Modeling the effect of humidity on the threshold friction velocity of coal particles

2012 ◽  
Vol 56 ◽  
pp. 154-160 ◽  
Author(s):  
Xiaochun Zhang ◽  
Weiping Chen ◽  
Chun Ma ◽  
Shuifen Zhan
Keyword(s):  
Friction Velocity ◽  
Threshold Friction Velocity ◽  
Coal Particles

scholarly journals The Effect of Land Uses on Soil Erodibility (Index) and Soil Loss of the Keana Geological Sediments of Parts of Nasarawa State, Nigeria

2021 ◽  
pp. 10-20
Author(s):  
M. G. Abubakar ◽  
M. O. Udochukwu ◽  
O. S. Enokela
Keyword(s):  
Land Use ◽  
Soil Loss ◽  
Agricultural Land ◽  
Sandy Loam ◽  
Soil Analysis ◽  
Mean Value ◽  
Soil Erodibility ◽  
Land Uses ◽  
Residential Land ◽  
Modified Clay

The effect of land uses on soil erodibility and soil loss of the Keana geological sediments of parts of Nasarawa State, Nigeria was investigated in this study. Geographic positioning system (GPS) was used to identify three land uses (agricultural, forested, and residential). Soil samples were collected from top soils at 0-30 cm depth using core sampler from 1 ha of each land use in 8 settlement communities (16 locations). Standard laboratory methods for soil analysis were followed for determination of Dispersion ratio, Erosion ration, Clay ratio and Modified clay ratio. Linear regression and correlation were used to determine the logical relationship between the erodibility index and corresponding soil loss. The soils from the study area were classified as sandy loam and sandy clay loam with high density, high permeability and porosity making them less vulnerable to shear stress. Dispersion ration (DR) modified clay ratio (MCR), Clay ratio (CR) and Erosion ratio (ER) where high, which suggests that soils from the study area are vulnerable to erosion at various degree of susceptibility.  Mean value of erodibility factor (K) and predicted soil loss of 0.0492, 0.0460 and 0.0357; 7.77, 7.20 and 5.48 tonnes/hectare/year  for agricultural, forested, and residential  lands respectively. The findings suggest that land uses influence the soil erodibility in the formation is in this order residential land > agricultural land > forested land use. The erosion class is ‘very low’ for forested (soils in this class have very slight to no erosion potential), ‘low’ (soil losses will occur) for agricultural and residential land uses respectively. These findings suggest that soil erodibility has been significantly influence by land use change in Keana geological sediment.

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