چکیده مقاله
Low flow index of 7 day from 57 hydrometric stations was extracted and examined to detect trends and changes in timing of summer and winter 7 day low flows Man Kendall MK nonparametric trend test was applied to the time series to investigate the existence of any trend at a 95% confidence level In order to account for serial correlation, the variance of the S statistic was modified if its absolute value exceeded a certain confidence interval Significant upward trends were observed in the Northern Canada where almost all of the stations located above latitude 60o showed an increasing trend in 7 day low flow quantities A significant downward trend dominated Atlantic Provinces and southern British Columbia No evidence of significant trends in Prairies was found It was observed that 7 day summer lowflow in southwest significantly shifted to arrive earlier, but later in the west and northwest of Canada In 88% of detected trends, the winter 7 day low flow shifted to arrive earlier; however, both winter and summer low flow was experiencing a shift toward earlier dates in the eastern part of the country Furthermore, in western Canada winter trends were downward while summer trends were upwards
کلیدواژهها
نویسندگان
Kaz Adamowski
Department of Civil Engineering, University of Ottawa, Ottawa, Ontario, Canada
Eghbal Ehsanzadeh
Kaz Adamowski Department of Civil Engineering, University of Ottawa, Ottawa, Ontario, Canada
شیوه ارجاع
Adamowski, Kaz and Ehsanzadeh, Eghbal,1385,Detection of Trends in Low Flows,07th International River Engineering Conference,Ahvaz
ارائهشده در
مجموعه مقالات هفتمین سمینار بین المللی مهندسی رودخانه24 بهمن 1385 · اهواز