Why brahmautra shifts its channel frequently. 5 pts
Answers
The Brahmaputra is divided into many channels and under flood conditions it changes its channels due to sediments deposition, transportation and bars information
Brahmaputra is one of the unique river system of its kind where the head stream travels for almost 1100 km as a thin mountainous river, then gets rejuvenated , changes its path ,enters plains, and within next 100 km becomes as broad as 20KM in some locations ..
Brahmaputra changes its channels so abruptly because
Barriers like Namcha Barwa with height beyond 7000mts obstruct the path of natural flow..To negotiate such barrier it changes channel several times before entering Arunachal.
Sudden drop of gradient after entering Assam due to relatively flat relief, results in deposition of huge amount of sediments and silts...
Heavy rainfall in Siang as well as Assam hills add huge quantum of water , resulting in regular flooding of river , which also causes channel shifting.