Studies on textural characteristics of Erra Kalva River, West Godavari District, Andhra Pradesh, East coast of India

The detailed textural study of Errakalva river (lat. 16° 50’ - 17° 20’ N: long. 81°0’- 81° 40’ E) has been carried out. A total of forty samples from thirteen stations were collected along the river profile from different locations indicate that the sediments possess a mean grain size range of granule to medium sand; moderately sorted to poorly sorted; very coarsely skewed to very finely skewed; very platykurtic to very leptokurtic in nature. The area of sediment bar, channel bar sediment samples and depositional energy conditions were also studied. Frequency Distribution Curves and scatter plots drawn between different textural parameters clearly established that the sediments are of unimodal nature and are having very coarse to medium sand (mean 1.5Φ). The sediments are deposited under tractive current conditions with dominant bottom suspension and rolling mechanisms.