Essay On Stability Of River Banks

The results shows us that the hypothesis between the river Loughton brook and the erosion shows that it gets wider and deeper due to many reasons such as vertical erosion, lateral erosion, hydraulic action and abrasion of rocks.

Watson, Chester C., David S. Biedenharn, and Colin R. Thorne. "Analysis Of The Impacts Of Dikes On Flood Stages In The Middle Mississippi River." Journal Of Hydraulic Engineering 139.10 (2013): 1071-1078. Academic Search Complete. Web. 2 May

This project proposes that the stream banks be corrected from their current state of severe soil erosion. Some of the walls of soil surrounding the stream can reach approximately 1.8 meters in depth. Where the runoff drain meets the stream can even reach up to approximately 2.6 meters. The walls of the stream bank are a vault of in situ soils slowly restoring themselves to low sloping conditions through more erosion. This is an indicator that there has been extreme down cutting as result of stream channelization.

Amec Foster Wheeler is a publicly traded company providing various services in markets such as Oil & Gas, Mining, Environment & Infrastructure and Clean Energy. The purpose of this report is to investigate and analyze stratigraphic units, geotechnical properties, identify the presence of weak clay layers in the Water Management Pond (WMP) site and how failures such as cracking can occur in embankment dams.

The methodology used was to utilize the Recurrence Interval formula (R) = (N+1)/M, to determine the recurrence interval and magnitude of historical floods provided on the Stream Gauge Data of Peak Flood Discharges on Clearwater River in Hazard City. Also, I reviewed the flood insurance map to

Recent decades have seen an increase in the amount of water flowing into the reservoirs, primarily due to increases in impervious surfaces. “Of the 10 largest pools that have accumulated in the reservoirs, nine have occurred since 1990 and six of those were since 2000.”21 In 2009, the dams of the reservoirs underwent an evaluation. They were classified as Dam Safety Action Classification (DSAC) 1 Dams, meaning at extremely high relative risk for failure when considered with the potential life and economic consequences. The embankment permeability and strength and the outlet structures were seen as areas of

With the tremendous loss of life and destruction of property that resulted from Hurricane Katrina, the American Society of Civil Engineers and the U.S. Army Corps of Engineers (USACE) began redesigning and implementing new hurricane prevention system guidelines. Through extensive studies, it was evident that the structures for the levees were constructed on weak and compressible soil. “Although the geology of the area was relatively well known and borings taken were reasonably adequate for characterizing the variety of conditions in the area, the spacing could have missed local anomalies in soil type and strength” (USACE I-119). As a result, geotechnical engineers suggested a

In other sections of the bridge, gusset plates got as thick as 1 3/8”. A thicker plate should have been used on joints like the U10 joint. The designer of the bridge made an error in the design analysis when calculating the thickness of each gusset plate needed for each joint.

The slope conditions worsen more while doing maintenance works. The slide might grow bigger after signing contracts.

The Oso landslide in Seattle, Washington took 43 lives in 2014. (Metcalfe, 2015) New technology is used to determine the areas that a potential landslide could occur. A landslide is a shift of land down a slope. Using geographic information systems to determine the probability of landslides can save lives. North America experiences relatively less landslides than countries in South America and Asia. Steep slopes, excessive rainfall, unstable soil, and seasonal dry periods are the main reasons that South America and Asia experience a greater number of landslides than North America. (Shahabi, 2015) In North America, Seattle experiences the most landslides with over 100 since 2007. (Metcalfe, 2015) Seattle experiences large amounts of rainfall and is prone to steamrolling walls of muddy debris. (Metcalfe, 2015) Geographic information systems(GIS) allows us to visualize and interpret data to determine if a pattern is forming. GIS is used to compare different alternativities to help support a decision. (DeMeritt, 2013) GIS maps are formed to help show possible landslide areas. (DeMeritt, 2013) The maps are formed by using remote sensing, satellite images, and aerial views. (Shahabi, 2015) The caution areas are usually on large slopes, the edges of cliffs, or areas with little to no vegetation. Individuals can take necessary precautions when warned about a possible landslide. The goal is to save lives and prevent injuries. When a large storm is noticed, the areas prone

At the coast, scientists observed a massive expansion of the river mouth delta during the second year of dam removal. At that time, wave-breaking zone of the river mouth was moved over 200 m toward the offshore direction. During the second year of dam removal, detailed coastal surveys said that this expansion deposited about 2.2 million cubic meter (about 3.3 million tons) of sediment. Although most of the sediment was gravel and sand, a broad patch of mud was covered the seafloor from 0–2 km west of the river mouth. Researchers observed a secondary region of sand deposition in the place in 0–5 m water depths from about 1.5 km east of the river mouth. The sediment was 1–2 m thick, and it came from eastward transport of sediment which was deposited initially offshore of the river mouth (Warrick, 2015).

Slope protection systems are a great way to prevent runoff from entering water bodies, such as lakes. According to Mr. S. K Goyal, Managing Director of Spar Geo Infra – A Geotechnical company known for its innovative, excellent and quality services in technology, engineering and construction services: “Slope protection systems stabilize soils on embankments to prevent severe erosion caused by surface runoff. In addition, it also absorbs the runoff into designated areas of gravel, large rocks, or soil."

They include the dying of various animals and seldom fish species. The landscape around the dam could be damaged to a great extend due to the rise of the Yangtze water level. Drainage outlet could occur and therefore some of the surrounding land-scape will be flooded.

When a strip foundation is to be used on a sloping site the most economic solution is to use a stepped foundation which will reduce the amount of excavation, construction under ground, backfill and trench support. The provision of stepped foundations following the line of the ground requires each step to be between 150 and 225millimetres in order to accommodate brick or block courses. The lap of concrete at the step should be not less than the depth of the foundation concrete and never less than 300millimetres whichever is the greater.

Bangladesh is prone to various disasters having immense harmful consequences associated with different natural and man-made hazards. Among most of the natural hazards, Landslide is being prioritized as a matter of great concern as a result of its devastating nature. South-eastern part of Bangladesh is very much prone to this hazard with long history of instability since the people have been living there though there is not enough record of incidents. Landslides are frequently resulting in losses of both lives and properties which are being worsened with rapid and unplanned urban development and frequent changes in land use (Popescu, 2010). Almost every year, during the monsoon, the hilly areas of the southern part experience landslide due to both natural and human-induced instable slopes and causes tremendous damage to life and property. More rapid urbanization trend, other human development activities through deforestation and hill-cuttings have triggered the increase of landslide incident in mountainous regions(Mia, Sultana, & Paul, 2015).