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- Title
Bedforms and their Hydrodynamic Interpretations from the Thakuran Drainage Basin of the Sunderbans, Eastern India.
- Authors
Das, Gautam Kumar
- Abstract
The exposed portions of the Thakuran River bed and the intertidal mid channel bars revealed various bedforms of tidal origin. Sand flats with small and large-scale bedforms dominate over the downstream portion of the shoals whereas; mudflats are with less physical structures. The presence of megaripple marks and ripple marks as bedforms indicates that the river goes up to the upper part of the lower flow regime. Both the surface and internal structures are indicative of tidal influence. Surface structures like small ripple marks, linguoid ripples, megaripples, sandwaves, rill marks, rhomboid marks etc. are recognized. Internal structures like flaser and lenticular type is highly indicative of flood and ebb cycles. Zones with distinctive bedform characteristics can be delineated based on their morphological variations and orientations. Moreover, 5-15 cm wide intertidal belts are populated by hybrid bedforms. The structures indicating modification of bedforms due to fluctuating velocity and depth with ebb and flood periods include i) skewed spurs, ii) ripplefans, iii) flat-crested megaripples and sandwaves, iv) dissected channels and v) microdeltas.
- Subjects
INDIA; WATERSHEDS; SURFACE structure; VELOCITY
- Publication
Earth Science India, 2016, Vol 9, Issue 2, p53
- ISSN
0974-8350
- Publication type
Article
- DOI
10.31870/ESI.09.2.2016.7