News Excerpt
Researchers from Wadia Institute of Himalayan Geology (WIHG) have traced the Paleo-climatic history of Indus River.

Key Highlights
•    The researchers studied the discharge during periods in which the river experienced an increase in land elevation, due to the deposition of sedimentand its incision.
•    There is use of geometric data from overlapping gravels which fills the channel to calculate paleo-discharges during net river aggradations at 47–23 ka (thousand years), and preserved slack water deposits (SWDs) at 14–10 ka to constrain paleo-discharges that occurred during net river incision.
•    They observed that the aggradation in the Himalayan rivers occurred in glacial-interglacial transient warm climatic conditions (33–21 ka and 17–14 ka) when the sediment budget in the rivers increased just after the glacial events.

Significance
    River Terraces are ubiquitous in mountains that nourish and help sustain past, present, and future of human societies. These terraces are part of valley-wide aggradations, which has been studied extensively in Himalaya to understand the processes driving such a periodic increase in river valley land elevation and incision.
    Scientists are still debating whether wetter climate intervals with increased rainfall and glacial melting promote river aggradation through increased discharge and enhanced sediment load, or instead, is it during drier conditions when aggradation occurs through increased sediment to water ratio.