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Air pollution and water pollution are challenges for Sri Lanka since both cause negative health impacts. Overfishing and insufficient waste management, especially in rural areas, leads to environmental pollution. Sri Lanka is also vulnerable to climate change impacts such as extreme weather events and sea level rise. [1]
In soil mechanics, dilatancy or shear dilatancy [1] is the volume change observed in granular materials when they are subjected to shear deformations. [ 2 ] [ 3 ] This effect was first described scientifically by Osborne Reynolds in 1885/1886 [ 4 ] [ 5 ] and is also known as Reynolds dilatancy .
The irrigation works in ancient Sri Lanka were some of the most complex irrigation systems of the ancient world. The earliest examples of irrigation works in Sri Lanka date from about 430 BCE, during the reign of King Pandukabhaya , and were under continuous development for the next thousand years.
Many systems in nature reach steady states, and dynamical systems theory describes such systems. Soil shear can also be described as a dynamical system. [28] [29] The physical basis of the soil shear dynamical system is a Poisson process in which particles move to the steady-state at random shear strains. [30]
The drained shear strength is the shear strength of the soil when pore fluid pressures, generated during the course of shearing the soil, are able to dissipate during shearing. It also applies where no pore water exists in the soil (the soil is dry) and hence pore fluid pressures are negligible.
Reportedly, a higher water content can stabilize a slope and increase the angle of repose. [5] However, water saturation can result in a decrease in the slope's stability since it acts as a lubricant and creates a detachment where mass wasting can occur. [6] Water content is dependent on soil properties such as grain size, which can impact ...
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Sri Lanka Freedom Party: 23 April 2010 - 9 January 2015 Mahinda Rajapaksa: Ministry of Irrigation and Water Resources Management Duminda Dissanayake: Sri Lanka Freedom Party: 12 January 2015 - 22 March 2015 Maithripala Sirisena: Ministry of Irrigation and Water Resources Management Gamini Vijith Vijithamuni Soysa: Sri Lanka Freedom Party