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Sedimentation in reservoirs effects the turbidity of the reservoir, and erosion patterns along the river. It also presents a cost to the government who has to dredge the rivers of its sediments. In Bangladesh, the government has to remove 0.8 million cubic meters of maintenance dredging and 2 million cubic meters of capital dredging per year.
Rephotography continues to be used by the scientific world to record incremental or cyclical events (of erosion, or land rehabilitation, [8] or glacier flow [9] for example), or to measure the extent of sand banks in a river, or other phenomena which change slowly over time, [10] and in gathering evidence of climate change.
These regional land cover maps are highly consistent and are designed to serve explicit user-defined objectives. Besides that, ICIMOD is involved in rapid mapping of flood inundation for the Koshi river basin, Bangladesh, Nepal, soil erosion and sedimentation yield spatial distribution and many more mapping activities for the regions. [29] [30]
Potato field with soil erosion. In addition to the usual types of land degradation that have been known for centuries (water, wind and mechanical erosion, physical, chemical and biological degradation), four other types have emerged in the last 50 years: [11] pollution, often chemical, due to agricultural, industrial, mining or commercial ...
From the change in diameter of the hole over time, the rate of erosion can thus be plotted against applied hydraulic shear stress and fit to the following equation: [1] [4] = where E r is the rate of erosion over time, k d is the soil erodibility, and τ c is the critical shear stress for erosion.
Most soil erosion models consider only soil erosion by water, however a few aim to predict wind erosion. Models which consider tillage erosion are rare. Also soil erosion models have been more commonly developed for use on agricultural landscapes, rather than on naturally vegetated areas (such as rangeland or forests).
Soil Resources Development Institute (SRDI) is a government organization under the Ministry of Agriculture working as a statutory organization that carries out research on soil and surveys on soil quality to improve agriculture in Bangladesh and is located in Dhaka, Bangladesh.
Reprography (a portmanteau of reproduction and photography) is the reproduction of graphics through mechanical or electrical means, such as photography or xerography. Reprography is commonly used in catalogs and archives, as well as in the architectural, engineering, and construction industries .