How Eroded Material of old age River forms Landforms

How Eroded Material of old age River forms Landforms

Posted by Manisha on May 19, 2020

Rivers are the lifeline of any country. More number of rivers in the country shows more possibilities for development and prosperity, especially in the primary and secondary sector.
The river serves the Earth throughout its life, in various ways.
Here in this post you will see what and how’s the river made different landforms during its old age (lower course river) before dying.

Lower course River

  • It is the 3rd and final stage of the river.
  • The speed of the river and the transportation strength of the river became very slow.
  • The volume of water is at its greatest because all tributaries mix or drained into the main river.
  • The lateral erosion (sideways) is more here.
  • The depositional work at its peak.
  • The energy in the river is very low.
  • The channel is wide and deep here.

3 Landforms of old age river

The main features of the lower course river or old age river are:

Natural Levees and Flood plain
  • When the river deposits its eroded material and sediments along with the edges of the river stream both sides like an embankment to prevent the adjacent area from the flood.

For example, the Mississippi river of the U.S.A. made 6-7 meter heigh levees. Huang ho river of China, Ganga of India also made natural levees.

Braided Stream
  • As its name already shows it is a network of so many streams.
  • When the river starts depositing all its sediments on the bed of the river and. Divide into many streams due to small and temporary sand islands called braid bars, braided streams formed.
  • Simply, one big stream divided into many small and shallow streams due to small sand islands situated in between but interlocked and tangled with each other.

For example, Majuli island of Brahmaputra river, India.

Delta
  • When the river is going to enter into an ocean, sea, lake, and reservoir it deposits all its sediments on its mouth and divided into many small streams as it is unable to carry forward.
  • It formed a triangle-shaped landform that is known as Delta.
  • It is created by the deposition of sediments on the mouth of the river.
  • The speed of the river is very slow, it looks like stagnant water.

River Ganga & Brahmaputra together formed the world's largest delta having area around 125,000 square kilometers, named Sunderban Delta.
other examples include river Neil, Mississippi, Niger, Sindhu, Huang ho, etc.

This way river work and serve the Earth by forming new beautiful landforms on it, till it’s death i.e. before draining into the ocean. These rivers give us the lesson of hard work throughout our life despite failure and success, never to stop.