The soils that are highly susceptible to erosion and containing high percentage of sodium ions are called “Dispersive soil.” Dispersivity is the property of soil by virtue of which soil separates into their component particles when wet. Soil dispersivity is due to the presence of exchangeable sodium present in the structure. Dispersive soils are structurally unstable soils. In appearance, dispersive clays are like normal clays that are stable and somewhat resistance to erosion, but in reality they are highly erosive and subjected to damage and failure. These soils are erodible in nature and have tendency to segregate in presence of water and erode under small seepage velocity leading to problems of stability failure of earth and earth retaining …show more content…
The failures associated with this type of soil are piping and internal erosion due to dispersion of soil. These soils cannot be identified by visual classification, Atterberg’s limits or particle size analysis. Dispersive soils are identified by pinhole test, crumb test and double hydrometer test. So, these soils are identified and stabilized. These soils are characterized by an unstable structure, easily flocculated in water, and very erodible. These soils usually contain high percentage of exchangeable sodium ions which is susceptible to replacement by calcium and aluminium ions. Soil with higher composition of coarse grained particles has higher dispersibility that lead to lower resistance to the internal erosion. Dispersive soils are stabilized with lime and fly ash. The dispersivity of soil is reduced with the addition of lime, pozzolanic material and cement. It is observed that with the increase in lignosulfonate the coefficient of erosion decreases and significantly increases the critical shear stress of both clayey and silty soils. Palm oil fuel ash is pozzolanic material. With the increase in POFA content the maximum dry density decreases and water content increases. POFA is used as a stabilizer in peat soil stabilization with the addition of OPC increased the unconfined confined compressive strength of the soil with the curing
For example, Sphagnum Moss obtains the minerals it needs (calcium, sodium, potassium and magnesium) by exchanging ions with the environment (Ecoscope: For Sustaining Wetlands). Hydrogen ions are exchanged with the cell wall of Sphagnum and this is called cation exchange. Since hydrogen ions are dissolved into the water, it becomes more acidic. The Sphagnum gains it minerals this way as bogs are mineral poor. Soil that has higher rates of cation exchange are more fertile that the soil that does not.
The first source which will be evaluated in depth is Eric Foner’s book “Free Soil, Free Labor, Free Men: The Ideology of the Republican Party before the Civil War” which was published in oxford in 1995. The purpose of this book is to analyze the civil war and evaluate the ideas of the early Republican Party. The author talks about how “free soil, free labor, free men” did not really apply for most Americans, and especially not blacks. The slogan refers to the belief that slavery was undemocratic, and the territories without slavery (free soil, free labor, free men), were morally and economically superior. The origin of this source is valuable because Eric Foner has served as a professor of History in City College from 1973 to 1982.
How the landscape and soil shape middle,new england and southern colonies New England ; the Soil in the New England region is quite rocky, hilly, and shallow. It made England hard to plant and export cash crops England was by the Atlantic ocean. The land in New England was shaped by glaciers. During the Ice Age, thick sheets of ice cut through the mountains. Glaciers pushed rocks and rich soil south.
Karla Negrete Mrs. McCaleb History 11.3 19 September 2017 On Native Soil On September 11, 2011 many events happened that changed American’s life forever. In my opinion I believe that this event could have been prevented if only the government would be well prepared. Three reasons that would support my claim would be: the lack of miscommunication,
The soil is compact and there are small particle which is the limestone-like created by the Bio-Vege Grout through chemical
The Earth has been creating many amazing things for centuries which can be found all over the world and has many parks dedicated to these amazing landmarks. These parks can just be normal parks with amazing views or just being a serene place to relax. Some parks however can be seen as being human made and can be just as fascinating as the ones that are natural. While these things can be similar they can also be very different to this will be the focus of this essay and how they can be similar or just different. Each paragraph is focused on a compare and contrast of each subject which is Normal natural parks versus The Newark Earthworks.
Through the completion of this project, my knowledge of the dustbowl has considerably expanded. I have learned about the dustbowl through textbook and lectures in class; however, this project has taught me the most about the dustbowl than any other source of information. This project improved my understanding of the dustbowl due to the fact that we used primary sources for our information. Primary sources allow us to get first-hand experience for any event and an actual account as to what happened. Although secondary sources helped my understanding of the dustbowl, primary sources gave me an actual representation of what occurred during the dustbowl through the use of providing interviews, photographs, and articles during the period of the dustbowl.
The loamy sand appeared in the A horizon which is considered to be the top soil region. Loamy sand is characterized by containing approximately 25% medium coarse sand particulates, 25% very coarse sand, and less than 50% fine sand and very fine sand (USDA, n.d). The larger the soil particles the less hydrophilic the soil is. Many horticulturalists find that loamy soils are very productive because of their ability to retain water while also draining well (Lerner). This can therefore explain the high levels of vegetative growth in the three locations the soil texture was present in.
Controlling stormwater runoff is essential to the environment, something the waterproofing and foundation repair experts at Jack Boiman Sons & Daughters in Cleaves, OH constantly emphasize. Stormwater runoff is defined as rain or melting snow that does not soak into the ground, rather it flows over assorted surfaces and collects pollutants along the way. Pesticides, fertilizer, salt, manure, leaves, oil and grease, assorted metals, and litter are among the contaminants stormwater picks up as it flows over paved areas, bare soil, sloped lawns, etc. before draining into streams, ponds, lakes, and other water sources. Your Cleaves waterproofing company is dedicated to helping control this environmental issue, and provides numerous services related to yard drainage.
Burned organic matter in the soil also affects the natural layering of the soils. This negatively affects infiltration and percolation, making the soil surfaces water repellent. Water therefore is unable to drain into water tables and the run-offs on the surfaces cause
Flash floods may cause loss of lives and properties. Soil erosion will leads to loss of minerals for the land. The land cannot be used for
This argumentative analysis examines the article “Realms of the Soil” written by Rachel Carson, which is a chapter from Silent Spring. The article argues about the destruction of the delicate balance of nature by wholesale use of insecticides. She describes the balance nature of the soil, of the earth’s water, and of the organisms of the earth, and how offsetting this balance can “kill” life. To put across her viewpoint, the author raised 3 important questions, which form the basis of her argument. First, what happens to these incredibly numerous and vitally necessary inhabitants of the soil when poisonous chemicals are carried down into their world through the use of insecticides?
In some areas, soils contain enough calcium ions (Ca2+) and magnesium ions (Mg+2) that are attached to the negatively charged minerals in the soil to neutralise or buffer
The extensive glaciations of the region has resulted in poorly developed top soil and soil horizons .Soils generally have low shrink swell potential because of their minimal clay content but high erosive potential because generally they are thin and
The formation of the main reason is due to flood alluvial. When floods occur, especially in mountainous areas, the following