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Exploring Streamflow Variation in the Subarnarekha River Basin, Jharkhand, India

2024; Springer Nature; Linguagem: Inglês

10.1007/978-981-97-1685-2_6

2198-3542

Shashank Shree, Manoj Kumar,

Flood Risk Assessment and Management

A trend analysis of a river basin's streamflow and rainfall provides valuable information for the better understanding and sustainable management of water resources for different activities like agricultural industrial, hydropower, etc. In this chapter, trend analysis and abrupt change in streamflow of four gauging stations of Subarnarekha River were explored using Mann–Kendall and Pettitt test for the period (1996–2017: 22 years) on a seasonal and annual basis. The Pettitt test result demonstrates that over the period 1996–2017, none of the hydrological stations showed any abrupt change in streamflow discharge. Muri, Jamshedpur, and Ghatsila gauging stations showed a negative trend in annual and monsoon streamflow discharge, but annual streamflow discharge at Adityapur gauging stations exhibited a positive trend, showing that the river Subarnarekha's mainstream provides less water than its major upstream tributaries Kharkai. The results of the Spearman correlation coefficient were found significant for annual, monsoon, and post-monsoon seasons between streamflow of basin outlet gauging stations (Ghatsila) and basin rainfall, which reflect Subarnarekha is a unique seasonal river with monsoonal characteristics. Changes in annual and seasonal streamflow regimes may increase the likelihood of future droughts. In light of the findings, efforts should be focused on building a water resource management plan to tackle the possible negative effects of predicted changes in seasonal and annual streamflow regimes.