Evolution avec la fraction d’argile kaolinite… apparition d’un seuil détectable entre 30 et 50% d’argile pas de modification significative du coefficient d’érosion
Pays et paysages de l'argile. Approche géomorphologique des …
L'étude des paysages de l'argile a été rarement entreprise en tant que telle, parce que l'argile est un matériau ubiquiste, dont le comportement vis-à-vis de l'érosion est supposé prévisible dans ses grandes lignes (roche meuble facile à inciser et à exporter), donnant lieu à des reliefs « mous », modelés par des processus d ...
erosion contributes between 30 and 65% of all the sus-pended sediment (or 1.7 × 106 to 4.5 × 106 t/year) that is ex-ported to the St. Lawrence estuary at Québec City (Rondeau et al. 2000; Dauphin 2000). This laboratory study investigated the mechanisms of ero-sion and the factors influencing erosion rates for undisturbed
Dispersive clay, with unique specification, is highly susceptible to erosion in certain circumstances. The erosion of the core of embankment dams in which dispersive clay are used can be usually led to hazardous occurrence. The primary factor contributing the susceptibility of a clay mass to erosion is the percent of sodium and other dissolved ...
Erosion of undisturbed clay samples from the banks of the St.
The dominant erosion process was a mass erosion of the blocks of clay delineated by the cracks. Desiccation or weathering significantly increased erosion rates, as tension cracks formed due to drying, and upon rewetting, the formation of microfissures resulted in disintegration into small, easily erodable flakes.
Impact d’un traitement à la chaux, au ciment ou à base d’argile …
This study aims to describe the effects of clay, lime and cement soil treatments on the internal erosion, specifically with regard to the amount of treatment used and the curing time. A new enhanced hole erosion test was developed to apply a high inlet pressure up to 650 kPa and thus generate a hydraulic shear stress up to 10 000 Pa.
Advances in soil erosion research: Mechanisms, modeling and ...
2023年12月1日 · Soil erosion encompasses detachment, transport and deposition of soil particles by raindrops and surface flow. These are fundamental concepts and the foundation of soil erosion research. The articles in this theme cover new developments in our understanding of the mechanics of soil detachment by raindrops, sediment transport, flow hydraulics of ...
Evaluating the erodibility of major soils of Aba Gerima and Guder ...
4 天之前 · Soil erodibility (K) is the intrinsic resistance of a soil to erosion which is a key factor required in soil erosion modeling and other process based models across the world. Soil erosion is a major problem in Ethiopia and estimation using models can help decision makers for interventions. But our K factor determinations in models have limitations and yet rare study has been done to determine ...
Soil erosion modelling: A global review and statistical analysis
2021年8月1日 · GSERmap will address the three main soil erosion-driven processes, i.e., water erosion, wind erosion, and redistribution due to the mechanization of agriculture (referred to as tillage erosion). The new country-based UN global soil erosion assessment will involve hundreds of soil erosion experts worldwide ( FAO, 2019 ).
Assessment of the Soil Erosion Susceptibility Zones in Tea …
4 天之前 · Soil erosion is one of the most serious environmental hazards in the world. Continuous soil loss from the earth’s surface reduces soil fertility, which poses a significant threat to sustainable agricultural practice. In Jalpaiguri district, a major part of the area is occupied by tea plantation (595.30 km2), after agricultural land. The tea plantations are divided into two categories: Big ...