1. Trend Analyses of Seasonal Mean Temperature Series Pertaining to the Tapi River Basin Using Monthly Data

Information about climate change on the scale of basin is very crucial for development, planning and utilization of water. The Tapi basin is climatically responsive. One of the most crucial parameters of the climate is temperature. Alterations in climate at regional scales influence rudimentary aspects of our life. It is important for policymakers that individual seasonal alterations are illuminated. Therefore, in the current work, trend detection analysis of regional seasonal (four seasons) mean temperature (T_mean) series (1971–2004) appertaining to the Tapi basin is conducted. Evaluation of trend magnitude is performed by using Sen’s slope (SS) test. Identification of dependence of data is performed by using correlogram. Assessment of trend significance for independent and dependent data is performed by using Mann–Kendall (MK) test and block bootstrapping approach with MK test (MKBBS test), respectively. The results showed the presence of statistically significant increasing trend only in regional winter T_mean series of the basin.