期刊名称：International Research Journal of Earth Sciences
电子版ISSN：2321-2527
出版年度：2016
卷号：4
期号：6
页码：1-16
语种：English
出版社：International Science Community Association
摘要：This work mainly concentrates on detecting trend of stream flow since 1978 to 2014 in Punarbhaba river of Indo Bangladesh. For detecting trend and change, Pettitt test, standard normal homogeneity test (SNHT), Mann-Kendall test, Spearmans rank correlation methods have been used. It is observed that within this spectrum of study period, 1992 is detected as yard mark for change in flow regime. In pre and post change point phases, water levels have reduced by 10.22%, 18.22%, 15.42% and 12.48% during pre monsoon, monsoon, post monsoon and winter periods respectively. Significant trend is detected in mean, maximum and minimum flow character as indicated by Kendall\'s tau value of MK test e.g. -0.57, -0.62 and -0.48 in the respective parameters. After change point phase water level is reduced but variability of flow is increased from 2.24% to 6.61% for mean flow level, 1.54% to 6.45% for maximum flow level and 3.24% to 5.78% for minimum flow level. This sort of flow attenuation has fur flung impact on downstream habitat and ecosystem characters.
关键词：Change point detection;flow regime;flow trend;Mann-Kendall Test and Pettit’s test
