Deposition
Deposition is the geological process in which sediments, soil and rocks are added to a landform or land mass. Wind, ice, water, and gravity transport previously weathered surface material, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment.
Deposition occurs when the forces responsible for sediment transportation are no longer sufficient to overcome the forces of gravity and friction, creating a resistance to motion; this is known as the null-point hypothesis. Deposition can also refer to the buildup of sediment from organically derived matter or chemical processes.
What are the differences between a River and a Creek?
While a creek and a river are both water bodies and are nearly identical, there are some differences between the two. Differentiating the two can be a little tricky because both of them serve as habitats for a lot of life as well as aiding in the circulation of water on the surface of the earth. Before analyzing the two, it is crucial to remember that there are no rules officially differentiating them.
A river may be defined as a naturally occurring watercourse that mostly has fresh water, and that eventually deposits its load into oceans, seas or even other rivers. A river can have its source from melting ice or glaciers or even from springs that arise from underground flows. Usually, rivers have their sources located in places of high altitude.
A creek can be described as a small body of flowing water. However, it should be noted that the meaning of the term ‘creek’ slightly differs in different countries. In North America, New Zeland and Australia, a small or a medium size stream is called a creek. In the United Kingdom and India, a creek is a narrow inlet to the sea.
Creeks have all the characteristics that rivers possess with a few differences between the two. A creek does not usually drift out into a new channel or form a new branch or even have tributaries. A river, on the other hand, is more likely to branch out into different or multiple routes. In addition, it is also more likely to have tributaries that connect. Since a creek can flow under the surface of the earth, it possible for the sea to be the origin of a rivulet. A river is more likely to have its origins from a place with a high altitude which equates to rivers mostly having fresh water.
While the above reasons can potentially help in differentiating between the two, they are by no means to be used too strictly.
Dubai Creek
Khor Dubai (Dubai Creek in English) is a saltwater creek located in Dubai, United Arab Emirates (UAE). Previously it extended to Ras Al Khor Wildlife Sanctuary, but as part of the new Dubai canal it extends through to the Persian Gulf.
Historically, the creek divided the city into two main sections – Deira and Bur Dubai. It was along the Bur Dubai creek area that members of the Bani Yas tribe first settled in the 19th century, establishing the Al Maktoum dynasty in the city. In the early 20th century, the creek served as a minor port for dhows (traditional sailing vessels) coming from as far away as India or East Africa.
The importance of the creek as a site of commercial activity was a justification to introduce improvements to allow larger vessels to transit. The creek was first dredged in 1961 to permit 7-foot (2.1 m) draft vessels . The creek was dredged again in the 1960s and 1970s so that it could offer anchorage for local and coastal shipping of up to about 500 tons.
In September 2007, a extension of the creek was finished, which now ends just south of the Metropolitan Hotel on Sheikh Zayed Road. A final 2.2-kilometre extension, called the Dubai Water Canal was inaugurated 9 November 2016, crossing Sheikh Zayed Road in a northerly route, passing through Safa Park and then through Jumeirah 2. The channel is expected to continue through Jumeirah Beach Park where it will reach the shores of the Persian Gulf.
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You must answer these two questions based on what we observed on site:
1 - Do you think the deposition is controlled by the man in dubai creek?
2 - Can you identify deposition sites? What are the characteristics of sediments?
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