Title: Hydro-meteorological trend analysis using the Mann-Kendall and innovative-Şen methodologies: a case study

Authors: Dang Nguyen Dong Phuong; Vo Ngoc Quynh Tram; Tran Thong Nhat; Tran Dinh Ly; Nguyen Kim Loi

Addresses: Research Center for Climate Change, Nong Lam University, Ho Chi Minh City, Vietnam ' Research Center for Climate Change, Nong Lam University, Ho Chi Minh City, Vietnam ' Faculty of Information System and Remote Sensing, Ho Chi Minh City University of Natural Resources and Environment, Vietnam ' Faculty of Economics, Nong Lam University, Ho Chi Minh City, Vietnam ' Research Center for Climate Change, Nong Lam University, Ho Chi Minh City, Vietnam

Abstract: This paper analysed temporal trend possibilities of hydro-meteorological records in Vu Gia Thu Bon watershed during 1979-2014 by employing the recently innovative-Şen trend methodology in combination with the classical/modified Mann-Kendall tests. The outcomes show that most of statistically significant increasing trends were found in annual rainfall, extreme temperatures, relative humidity and stream flow, whereas opposite trend direction was predominantly observed in evapotranspiration and sunshine duration over the 36-year period. Particularly, the greatest warming trends in maximum and minimum temperature were 0.019 and 0.024°C/year respectively. The estimated slope of significant positive trends in rainfall varied approximately from 29.7 to 43.6 mm/year. This study also demonstrates high applicability of the innovative-Şen approach to overall and partial trend identification. Generally, it is expected that these findings will be conducive to climate-induced risks and water resources management for the study area under climate emergency.

Keywords: hydro-meteorological trend; innovative-Şen; Mann-Kendall test; sub-trend; Vu Gia Thu Bon watershed.

DOI: 10.1504/IJGW.2020.105385

International Journal of Global Warming, 2020 Vol.20 No.2, pp.145 - 164

Received: 31 May 2019
Accepted: 02 Sep 2019

Published online: 19 Feb 2020 *

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