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Temporal Variability of Discharge and Suspended Sediment Transport in the Subarnarekha River Basin, Eastern India: A Geomorphic Perspective

2022; Springer Nature; Linguagem: Inglês

10.1007/978-981-16-6966-8_24

2198-3542

Sunanda Banerjee, Arup Kumar Roy, Asraful Alam,

Hydrology and Drought Analysis

In the world, over the last 50 years, many rivers had experienced decreasing trend in runoff and sediment load. In Subarnarekha, after analysing the data of discharge, runoff and sediment load of hydrological stations, it is clear that Subarnarekha also has declining trend. In the last few decades, precipitation rate has also declined day by day. In 2010–2011 precipitation rate was very low in Subarnarekha basin. Runoff, water discharge and sediment load are proportionately related to precipitation rate. Anthropogenic factors are also responsible for declining rate in Subarnarekha. Previously water discharge was closely related to the monsoonal rainfall but in few decades discharge and sediment load gradually decrease due to the human intervention like barrage, dam construction and other activities. In Ghatshila station, before dam construction the peak of highest suspended sediment concentration occurs first, then the rising limb of hydrograph occurs but after dam construction, peak suspended concentration and peak of flood hydrograph coincide with each other. Satellite imageries show the channel bar changes in Adityapur, Jamshedpur and Ghatshila.