scholarly journals A Inserção Antropogênica na Construção e Reorganização do Cenário da Paisagem do Vale do Acaraú, CE (The Anthropogenic Insert in the Construction and Reorganization of the Scenery Landscape of Vale do Acaraú-CE)

2015 ◽  
Vol 7 (6) ◽  
pp. 1078
Author(s):  
José Falcão Sobrinho
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Natural Resources ◽  
Catchment Area ◽  
Agricultural Soil ◽  
Field Work ◽  
Small Farmers ◽  
Erosion Process ◽  
Cultural Phenomenon

O artigo nos remete a uma discussão na interação das atividades dos pequenos agricultores, estes sendo condicionados por condições que a natureza oferece. Interação esta que foi nosso objetivo maior da pesquisa. Oferece ainda referências sobre a ação do agricultor no processo erosivo do solo, enfatizando a erosão enquanto fenômeno cultural e tratou de perceber a natureza a partir da compartimentação geomorfológica, associando ao uso do solo os fatores de potencialidade e fragilidade dos recursos naturais sobrepostos ao relevo.  A B S T R A C T The article leads us to a discussion on the interaction of small farmers activities, these being conditioned by conditions that nature offers. This interaction was our research biggest goal. Also provides references to the action of the farmer in the soil erosion process, emphasizing erosion as cultural phenomenon and tried to perceive the nature from the geomorphological subdivision, associating to the land use the potentiality and fragility factors of natural resources superposed to the relief. For gathering information about the various types of interventions landscape, we performed field work, covering the entire catchment area, reporting and photographing the various forms of land use. We conclude there are significant changes in the scenery of the countryside, especially the use of agricultural soil. Keywords: Culture. Semiarid. Ambiental History.  

scholarly journals Aplikasi Penginderaan Jauh dan SIG dalam Penilaian Potensi Erosi Permukaan secara Kualitatif di Daerah Tangkapan Waduk Kedung Ombo

2011 ◽  
Vol 25 (2) ◽  
pp. 152
Author(s):  
Arina Miardini ◽  
Beny Harjadi
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Geographic Information Systems ◽  
Soil Erosion ◽  
Soil Type ◽  
Catchment Area ◽  
Drainage Density ◽  
Soil Types ◽  
Slope Gradient ◽  
Slope Direction

The purpose of this study was to determine the potential erosion qualitatively by using SES by using Remote Sensing and Geographic Information Systems in Kedung Ombo’s catchment area so it can be determined which areas of priority should be conserved. The method used is qualitatively analyses through SES method (Soil Erosion Status).) Which is calculated based on five parameters are: slope direction (aspect), slope (slope gradient), the density of the river (drainage density), soil type (Soil types), and land use (landuse/landcover). The result shows that DTW Kedung Ombo has three classes of erosion, which is very low, low and medium. Amounted to 41179.08 ha or 71.31% of the total DTW Kedung Ombo erosion potential is still relatively mild, 13956.01 ha (24.17%), erosion potential is very low and 2608.95 ha (4:52%) were classified as potential erosion.

scholarly journals Investigation of the effect of anthropogenic land use on the Pănăzii Lake (Romania) catchment area using Cs-137 and Pb-210 radionuclides

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0251603
Author(s):  
Robert-Csaba Begy ◽  
Codrin F. Savin ◽  
Szabolcs Kelemen ◽  
Daniel Veres ◽  
Octavian-Liviu Muntean ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Sedimentation Rate ◽  
Catchment Area ◽  
Gamma Spectroscopy ◽  
Soil Parameters ◽  
Erosion Rates ◽  
Soil Erosion Rate ◽  
Soil Erosion Rates ◽  
Lake Catchment

The problem of soil degradation has accentuated over recent decades. Aspects related to soil erosion and its relation to changes in land use as well as anthropogenic influence constitute a topic of great interest. The current study is focused on a soil erosion assessment in relation to land use activities in the Pănăzii Lake catchment area. Fallout radionuclides were used to provide information on soil erosion as well as redistribution rates and patterns. Variations in the sedimentation rate of the lake were also investigated as these reflect periods in which massive erosion events occurred in the lake catchment area. The novelty of this study is the construction of a timescale with regard to the soil erosion events to better understand the relationship between soil erosion and land use activities. In this study, 10 soil profiles and one sediment core from the lake were taken. Soil parameters were determined for each sample. The activities of 210Pb, 137Cs and 226Ra were measured by gamma spectroscopy. For low 210Pb activities, measurements via 210Po using an alpha spectrometer were performed. Soil erosion rates were determined by the 137Cs method and the sedimentation rate calculated by the Constant Rate of Supply (CRS) model. A soil erosion rate of 13.5 t·ha-1·yr-1 was obtained. Three distinct periods could be observed in the evolution of the sedimentation rate. For the first period, between 1880 and 1958, the average deposition rate was 9.2 tons/year, followed by a high deposition period (1960–1991) of 29.6 tons/year and a third period, consisting of the last 30 years, during which the sedimentation rate was 15.7 tons/year. These sedimentation rates fluctuated depending on the main land use activity, which can also be seen in the soil erosion rates that had almost doubled by the time agricultural activities were performed in the area.

scholarly journals Estimation of soil erosion and sediment yield concentration across the Kolleru Lake catchment using GIS

2021 ◽  
Vol 80 (4) ◽  
Author(s):  
Meena Kumari Kolli ◽  
Christian Opp ◽  
Michael Groll
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Soil Texture ◽  
Sediment Yield ◽  
Soil Loss ◽  
Catchment Area ◽  
Drainage System ◽  
Delivery Ratio ◽  
Lake Basin ◽  
Lake Catchment

AbstractFlat lakes with a large catchment area are especially affected by sediment inputs. The Kolleru Lake catchment (south-eastern India) with a surface area of approximately 6121 km2 belongs to such types of lake basins. The study’s main objective was the assessment of both soil erosion and sediment yield concentration rate of the Kolleru catchment. The study was conducted using the revised universal soil loss equation (RUSLE) model due to its simple and good applicability for soil erosion estimation. Data such as rainfall, soil texture, topography, crop cover management, and support practice factor were integrated into the modeling using RUSLE and ArcGIS. Field data were used both to analyze the soil texture and the slope length factor. The results showed that average annual soil loss was estimated with 13.6 t/ha/year, classifying the Kolleru Lake Basin under a very high erosion rate category. About 38% of the catchment area has encountered slight soil loss. Areas covered with moderate, strong, severe, very severe erosion potential zones are 29%, 17%, 9%, and 5.5%, respectively. This study identified that upland areas with less vegetation cover exported high potential erosion rates. Unlike the soil loss, the sediment delivery ratio values for the catchment were not affected by land use, while it showed a strong relationship with the catchment drainage system. Whereas, the average annual sediment yield was determined with 7.61 t/ha/year, had identified with the same pattern of the soil erosion. Catchment topography, vegetation, drainage system, soil properties, and land use cover played a major role in exporting the highest sedimentation. The outcome of these studies can be used among others to identify critical erosion areas on a pixel basis for the planning of erosion management practices.

scholarly journals Mapeamento de unidades geomorfológicas: bacias hidrográficas Arroio São João e Sanga da Divisa, Alegrete - RS

2003 ◽  
Vol 25 (25) ◽  
pp. 129
Author(s):  
Cristina Braz Cardoso ◽  
Luís Eduardo de Souza Robaina ◽  
Edgardo Ramos Medeiros
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Erosion Process ◽  
Indispensable Tool

This paper presents a contribution for study from the São João and Divisa Basin, Alegrete county (RS), where occur growing erosion. With of the mapping was possible separate five individual geomorphologic units using attributes included morphometric, geological, soil, erosion process, land use and vegetation. The mapping is an indispensable tool to aid and to manage in areas with growing erosion.

scholarly journals Diffuse pollution of waterbodies and assessment of nutrient removal under diff erent land-use scenarios in a catchment area

2019 ◽  
Vol 46 (2) ◽  
pp. 232-244
Author(s):  
S. V. Yasinskiy ◽  
E. V. Venitsianov ◽  
I. A. Vishnevskaya
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Nutrient Removal ◽  
Catchment Area ◽  
Diffuse Pollution ◽  
Nitrogen And Phosphorus ◽  
Spring Runoff ◽  
Land Use Scenarios ◽  
Annual Volume ◽  
And Migration

The concept of the process of diffuse pollution of waterbodies of various dimensions is presented. The algorithm for calculating the average annual volume of removal and migration of the main nutrients—nitrogen and phosphorus—from the catchment into the ravine and river network of a small river is demonstrated. The results of simulating the characteristics of the spring runoff, soil erosion, and removal of nutrients from the catchment area into the Istra River (Russia) with hypothetical changes in its landscape structure under the influence of urbanization and reforestation are developed through a series of calculations.

Simulating heavy rainfall events for parameterizing a first application of the physically based soil erosion model EROSION3D in South Africa

2020 ◽  
Author(s):  
Andreas Kaiser ◽  
Michael Geißler ◽  
Jay Le Roux ◽  
Marike Stander ◽  
George van Zijl ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
South African ◽  
Land Degradation ◽  
Field Work ◽  
Organic Carbon Content ◽  
Runoff Simulation ◽  
Erosion Model ◽  
Physically Based ◽  
Land Use And Management

<p>Soil erosion is a frequently tackled field of research and plays a major role in land degradation. Representing a discontinuous process soil loss is strongly determined by single events, which leads to high demands on modelling approaches.</p><p>Here we present a first application of the physically-based soil erosion model EROSION3D in a South African setting within the framework of the project SALDi (South African Land Degradation Monitor). Parameterization of the model requires intensive field work in accordance to land use and management patterns, soil types and topography. The experimental determination of physical and hydrological processes for selected sites allows for an improvement of the modelling results. Thus, rainfall and runoff simulation campaigns were carried out on various sites with a 3 x 1 m² mobile rainfall simulator. Additionally, UAV and TLS surveying, soil sampling, laboratory analysis and digital soil mapping complemented the approach. The created datasets are firstly handled in EROSION2D to calibrate soil erosivity and hydraulic conductivity and then introduced to EROSION3D for including land use, precipitation, elevation, multi-layered soil properties, organic carbon content and additional model input parameters.</p><p>The modelling procedure was applied within the boundaries of a research catchment close to Ladybrand in the Free State for first test runs. Furthermore, the same approach showed distinct differences on a conventionally tilled field vs. a conservational approach. An upscaling to larger catchments will then be carried out in basins with protected soils within Kruger National Park to directly compare them to results from intensively cultivated agricultural sites adjacent to the park boundaries.</p>

scholarly journals Soil erosion by snow gliding – a first quantification attempt in a subalpine area in Switzerland

2014 ◽  
Vol 18 (9) ◽  
pp. 3763-3775 ◽  
Author(s):  
K. Meusburger ◽  
G. Leitinger ◽  
L. Mabit ◽  
M. H. Mueller ◽  
A. Walter ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Land Cover ◽  
Sediment Yield ◽  
Soil Loss ◽  
Water Erosion ◽  
Erosion Rates ◽  
The Difference ◽  
Snow Gliding

Abstract. Snow processes might be one important driver of soil erosion in Alpine grasslands and thus the unknown variable when erosion modelling is attempted. The aim of this study is to assess the importance of snow gliding as a soil erosion agent for four different land use/land cover types in a subalpine area in Switzerland. We used three different approaches to estimate soil erosion rates: sediment yield measurements in snow glide depositions, the fallout radionuclide 137Cs and modelling with the Revised Universal Soil Loss Equation (RUSLE). RUSLE permits the evaluation of soil loss by water erosion, the 137Cs method integrates soil loss due to all erosion agents involved, and the measurement of snow glide deposition sediment yield can be directly related to snow-glide-induced erosion. Further, cumulative snow glide distance was measured for the sites in the winter of 2009/2010 and modelled for the surrounding area and long-term average winter precipitation (1959–2010) with the spatial snow glide model (SSGM). Measured snow glide distance confirmed the presence of snow gliding and ranged from 2 to 189 cm, with lower values on the north-facing slopes. We observed a reduction of snow glide distance with increasing surface roughness of the vegetation, which is an important information with respect to conservation planning and expected and ongoing land use changes in the Alps. Snow glide erosion estimated from the snow glide depositions was highly variable with values ranging from 0.03 to 22.9 t ha−1 yr−1 in the winter of 2012/2013. For sites affected by snow glide deposition, a mean erosion rate of 8.4 t ha−1 yr−1 was found. The difference in long-term erosion rates determined with RUSLE and 137Cs confirms the constant influence of snow-glide-induced erosion, since a large difference (lower proportion of water erosion compared to total net erosion) was observed for sites with high snow glide rates and vice versa. Moreover, the difference between RUSLE and 137Cs erosion rates was related to the measured snow glide distance (R2 = 0.64; p < 0.005) and to the snow deposition sediment yields (R2 = 0.39; p = 0.13). The SSGM reproduced the relative difference of the measured snow glide values under different land uses and land cover types. The resulting map highlighted the relevance of snow gliding for large parts of the investigated area. Based on these results, we conclude that snow gliding appears to be a crucial and non-negligible process impacting soil erosion patterns and magnitude in subalpine areas with similar topographic and climatic conditions.

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