196
Chattanga and Naugaon, six level of terraces are well preserved at elevations of
~120 m, ~105 m, ~95 m, ~20 m, 5–10 m and a youngest terrace from present
Yamuna river bed (Fig. 6). The terrace sediment is dissected by tributary channels
leading to several fan surfaces. In downstream direction, after Manjauli village area,
the Yamuna Valley again becomes very narrow and V-shaped with single channel
flow till Lakhamandal where again valley is very wide. In segment between Manjauli
and Lakhamandal, the terrace deposits are preserved in patches and are easily discernible along road cutting. These deposits are equivalent to terrace staircases preserved in wider valley parts and represents distinct palaeo-floodplain levels. In this
Fig. 4 Longitudinal profile of the Yamuna River, based on Survey of India toposheet at 20 m
contour interval. (a) Profile from north of MCT to MBT showing terrace treads in Sector-I & II and
OSL chronologies. (b) Longitudinal profile of the Yamuna River from MBT to HFT with palaeofloodplain trends and OSL dates (Vertical exaggeration is 4×)
S. Dutta et al.
Chattanga and Naugaon, six level of terraces are well preserved at elevations of
~120 m, ~105 m, ~95 m, ~20 m, 5–10 m and a youngest terrace from present
Yamuna river bed (Fig. 6). The terrace sediment is dissected by tributary channels
leading to several fan surfaces. In downstream direction, after Manjauli village area,
the Yamuna Valley again becomes very narrow and V-shaped with single channel
flow till Lakhamandal where again valley is very wide. In segment between Manjauli
and Lakhamandal, the terrace deposits are preserved in patches and are easily discernible along road cutting. These deposits are equivalent to terrace staircases preserved in wider valley parts and represents distinct palaeo-floodplain levels. In this
Fig. 4 Longitudinal profile of the Yamuna River, based on Survey of India toposheet at 20 m
contour interval. (a) Profile from north of MCT to MBT showing terrace treads in Sector-I & II and
OSL chronologies. (b) Longitudinal profile of the Yamuna River from MBT to HFT with palaeofloodplain trends and OSL dates (Vertical exaggeration is 4×)
S. Dutta et al.