Influence of reversing currents on the erosion stability and bed degradation of widely graded grain material

2018 ◽  
Vol 33 (1) ◽  
pp. 68-83 ◽  
Author(s):  
Alexander Schendel ◽  
Nils Goseberg ◽  
Torsten Schlurmann
Keyword(s):  
Erosion Stability

scholarly journals Experimental investigation of reservoir sediments

2018 ◽  
Vol 40 ◽  
pp. 03030 ◽  
Author(s):  
Felix Beckers ◽  
Stefan Haun ◽  
Markus Noack
Keyword(s):  
Sediment Cores ◽  
Critical Shear Stress ◽  
Objective Evaluation ◽  
Shear Stresses ◽  
Stability Parameters ◽  
Reservoir Sediments ◽  
Erosion Rates ◽  
Erosion Stability ◽  
Photogrammetric Method ◽  
Sediment Layers

This study presents an experimental approach to investigate cohesive reservoir sediments. It is shown, how adjacent sediment cores can be extracted from reservoir beds with a Frahm Sediment Sampler. The cores are subsequently used for detailed investigations in a hydraulic laboratory. In a first step, related cores are identified based on their bulk density profiles. One part of the related cores is used to analyze the sediment properties over depth by means of potential stability parameters. The other part is used to determine the depth-dependent erosion stability in an erosion flume (SETEG-system). In the SETEG-system, a photogrammetric method is applied to measure the erosion rates of pre-defined sediment layers at different exposed shear stresses. Subsequently, the critical shear stress can be derived, which leads to an objective evaluation and allows a systematic approach. Finally, both results are combined to investigate possible correlations between the evaluated depth-dependent stability parameters and the measured erosion stability. The approach is presented on sediment cores from the case study “Kleiner Brombachsee”, a reservoir that is located in Middle Franconia, Germany.

Study on erosion stability enhancement of sands using enzymes

2015 ◽  
Vol 2 (5) ◽  
pp. 301-308 ◽  
Author(s):  
Andreas Becker ◽  
Christos Vrettos
Keyword(s):  
Erosion Stability ◽  
Stability Enhancement

scholarly journals Grouting below Subterranean Water: Erosional Stability Test

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2333
Author(s):  
Jiří Boštík ◽  
Lumír Miča ◽  
Ivailo Terzijski ◽  
Mirnela Džaferagić ◽  
Augustin Leiter
Keyword(s):  
Weight Loss ◽  
Mechanical Effect ◽  
Stability Test ◽  
Medium Term ◽  
Erosion Stability ◽  
Specimen Weight ◽  
Negative Effect ◽  
Activated Bentonite ◽  
Technical Solutions ◽  
Subterranean Water

The article is focused on the medium-term negative effect of groundwater on the underground grout elements. This is the physical–mechanical effect of groundwater, which is known as erosion. We conduct a laboratory verification of the erosional resistance of grout mixtures. A new test apparatus was designed and developed, since there is no standardized method for testing at present. An erosion stability test of grout mixtures and the technical solutions of the apparatus for the test’s implementation are described. This apparatus was subsequently used for the experimental evaluation of the erosional stability of silicate grout mixtures. Grout mixtures with activated and non-activated bentonite are tested. The stabilizing effect of cellulose relative to erosion stability has been also investigated. The specimens of grout mixtures are exposed to flowing water stress for a certain period of time. The erosional stabilities of the grout mixtures are assessed on the basis of weight loss (WL) as a percentage of initial specimen weight. The lower the grout mixture weight loss, the higher its erosional stability and vice versa.

scholarly journals OVERFLOWING TESTS AT THE POLISH DREDGDIKES RESEARCH DIKE – STABILITY OF THE DIKE SURFACE AGAINST EROSION

2015 ◽  
Vol 6 (4) ◽  
pp. 159-168 ◽  
Author(s):  
Jan Olschewski ◽  
Stefan Cantre ◽  
Fokke Saathoff ◽  
Rafał Ossowski
Keyword(s):  
Erosion Resistance ◽  
Grass Cover ◽  
Considerable Time ◽  
Erosion Stability ◽  
Clay Cover ◽  
Vegetation Layer ◽  
High Erosion Resistance

In the project DredgDikes the different research dike embankments were tested with respect to overflowing water induced erosion. Therefore, flumes were installed on the land side embankments in which the effect of overflowing water on the vegetated surface was investigated. On the Polish DredgDikes research dike near Gdansk, Poland, two parallel flumes were installed and the surface of the dike made of different mixtures of ash, silt and sand as well as clay was tested both in vegetated and unvegetated state. The results showed that the grass sods placed on the dike embankment had a comparably low erosion stability, particularly if placed directly on the hardened ash/silt dike cover with better results if placed on a clay cover, while the ash/silt mixture showed a high erosion resistance without vegetation. This results in the recommendation to use a thicker vegetation layer on top of the ash composite dike if the vegetation shall account for the erosion resistance or else, that even if the grass cover is washed away, a very solid cover made of the ash composite can withstand an overflowing event for considerable time.

scholarly journals Ecological and economic basis of anti-erosion stability of forest-agrarian landscapes

2019 ◽  
Vol 27 (3) ◽  
pp. 444-452
Author(s):  
І. V. Koshkalda ◽  
V. V. Tyshkovets ◽  
A. A. Suska
Keyword(s):  
Soil Erosion ◽  
Economic Efficiency ◽  
Organic Fertilizers ◽  
Economic Conditions ◽  
Nature Management ◽  
Forest Plantations ◽  
Forest Stands ◽  
Ecological Economic ◽  
Erosion Stability ◽  
Protective Forest

The ecological and economic foundations of rational nature management in restoring various kinds of protective forest stands under conditions of severe damage and destruction of wood-shrubby species in the natural-climatic and economic zones of the country were developed. It was determined that using traditional methods of restoration of protective forest plantations in many cases is no longer acceptable due to different levels of damage and substantial changes to economic entities on Earth. However, the main methodological approaches remain. A new methodological approach to restoring forests on the basis of constant adaptation of the existing methodologies for the design and calculation of economic efficiency of new plantings and new ecological-economic conditions and peculiarities has been developed. Certainly ,numerousincorrectly planned forest stands have been created that do not sufficiently fulfill their ecological and economic functions and do not even have a general system of protection of the soil from negative factors. For effective regeneration of plants we have developed a formula for calculating the erosion stability of forest-agrarian landscapes for their optimal recovery through forest shelterbelts. We have developed new features of design and calculation of ecological and economic efficiency of newly created forest ameliorative spaces with new natural-economic conditions for their sustainable regeneration under modern conditions. The transition to environmentally sustainable agriculture of European standards requires fundamentally new solutions to the problem of using forest stands as an organizational component of ameliorative complexes in the context of soil erosion control measures. Soil erosion is one of the main factors of anthropogenic impact on land resources. Intensification of erosion processes leads to substantial degradation of soils, causing great losses to agriculture and generally endangers the safe development of mankind. As long as the process of degradation of the soil continues , the agroecological condition deteriorates and the increased application of mineral and organic fertilizers fails to improve the crop volume , insofar as the crop yield is formed mainly due to the natural soil fertility. In the process of research, we discovered that the expansion of the front intake surface runoff in forestry plantings allows one to increase their effective water-regulative functions. Such an event has a certain practical value, because a large proportion of forest shelterbelts even in satisfactory condition only perform their functionsat 20-30%. Taking into account the indicators of ameliorative-hydrological stress and counter-erosion stability of landscapes in locations of planted forest stands proved to be the most effective method of strengthening the initial contact with runoff ("active") plots .This provides is a unique chance to optimize the ecological economic system of protective forest plantations , especially in newly formed agricultural enterprises under new economic conditions.

scholarly journals DESTRUCTIVE WAVE OVERTOPPING AND WAVE RUN-UP TESTS ON GRASS COVERED SLOPES OF REAL DIKES

2012 ◽  
Vol 1 (33) ◽  
pp. 64
Author(s):  
Gosse Jan Steendam ◽  
Yvo Provoost ◽  
Jentsje Van der Meer
Keyword(s):  
The Netherlands ◽  
Pilot Test ◽  
Grass Cover ◽  
New Wave ◽  
Wave Overtopping ◽  
Erosion Stability ◽  
Sand Core ◽  
Run Up ◽  
First Time ◽  
Upper Slope

In March 2011 new wave overtopping tests have been performed in the Netherlands. In contrast to previous tests the grass cover of this dike was not maintained well, which had significant effect on erosion stability. Additionally, for the first time a pilot test has been made on wave run-up from an asphalt berm onto the grass covered upper slope of the dike. The tested dike sections had a sand core covered by a layer of clay and a grass cover. The objective was to test the erosion stability of seaward and landward slopes for wave overtopping as well as wave run-up. For the wave overtopping also the influence on erodibility of the grass cover caused by obstacles or other elements, which may be present at dikes (stairs, fences), was investigated.

Increasing the erosion stability of enamel coatings

1970 ◽  
Vol 27 (6) ◽  
pp. 342-344
Author(s):  
P. A. Averchenko ◽  
V. M. Pleskach ◽  
A. D. Yurchenko ◽  
R. I. Kolesnik
Keyword(s):  
Erosion Stability
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