Question

Majority of estuaries on west coast or east coast of india

Answer 1

Answer:

Explanation:

Every river has life of its own. As humans do, river also passes through various stages of its life viz. young, mature and old and eventually succumbs to its gradual demise over millions of years. But one feature which makes rivers strangely distinct from humans is the fact that rivers simultaneously live its various stage (young, mature & old) with its course i.e. near the area from where it originate/source it is in the young stage vindicated by the presence deep gorges, v shaped valleys, fast flow cutting through the rocks, near plains( U.P. to West Bengal case of Ganga) river enters mature stage characterized by wide course of river, sedate flow of water forming meanders by deposition of silt from the upper course, changing its course due to obstruction created by deposits. In the last stage i.e. old, river flow becomes very slow and carries with itself loads of sediments which it deposits near the mouth of river forming  deltas(mass sediment deposits) which in-turn form distributaries and falls into the sea.

These stages of river course are defined by gradient (slope of path), structure (rock construct, nearby mountains and plains). As river swipes from young to old stage this gradient decreases and reaches to the sea level also known as base level erosion. With the passage of time (many years) this gradient decreases due to exogenic forces (river water, wind, rain) and river is destined towards its quest for base level erosion. Perhaps river outlives its  time  and utility, and succumbs to a silent end for the want of gradient and water.

IN India East flowing rivers have long courses so they come across more rocks which they can transport and deposit in huge numbers to form deltas. West flowing rivers have short courses so they are denied of this facility.  

East flowing rivers specially Himalayan  rivers have steep slopes so they erode and inundate much more in rocks to transport more silt. On top of it Himalayas being in young stage are still rising so there is an increase in gradient which adds to the steepness and flow.

Added to it Himalayas were formed from the Thethys sea  have a sedimentary construct which is weak and provides large amounts silt for sedimentation. While the west flowing river come across igneous constructs (mountains in their way which are relict) which are hard and rugged not easily cut by running water. So there is paucity of sediments for the west flowing rivers to form deltas.

Eastern coast being submergent  (continental shelf extends up to 500 Kms) i.e. gentle slope that helps in depositional features. On the other hand Western coast being Emergent  and deep seas nearer to the coast easily nullify whatever small quantity of sediments brought by west flowing rivers.

Tides also have their say. Western coast more tides so more volatile environment, eastern coast more stable environment due to less tides so becomes haven for silt deposition.

Answer 2

Answer:

• In India, the west streaming waterways make estuaries and the east streaming streams make deltas.

• A delta is a territory of low, level land formed like a triangle, where a waterway parts and spreads out into a few branches before entering the ocean.

• An estuary is a halfway encased beach front group of harsh water with at least one waterways or streams streaming into it, and with a free association with the untamed ocean.

• There are numerous reasons that the west streaming waterways don't make delta, however estuaries

• Deltas are framed because of gathering of silt brought by the streams.

• Numerous west streaming waterways like Narmada, Tapti,Periar etc.passes through break valleys.

• They move through the regions of hard shakes.

• Subsequently these waterways contain little measure of sediments.

• Their territories are littler and the waterway covers short separation.

• There is a high inclination for the west streaming waterways. In this way with being exceptionally near coast and with high gradient,there are less odds of waterways getting wide towards the ocean dissimilar to east streaming waterways.

• More inclination implies higher is the speed of the stream.

• Hence west streaming waterways wind up framing estuaries instead of deltas.When these quick streaming streams reach to its mouth it become incapable to store its silts,due to this explanation sediments falls in to the ocean.