Characteristics and Attribution Analysis of Baseflow Variation in the Ganjiang River Basin from 1980 to 2019

Yueping Deng; Yuanqing Liu; Yanping Wu; Jing Chen; Jin Sun; Bo Liu

doi:10.54097/dm86v952

Authors

Yueping Deng
Yuanqing Liu
Yanping Wu
Jing Chen
Jin Sun
Bo Liu

DOI:

https://doi.org/10.54097/dm86v952

Keywords:

Baseflow, Climate Change, Human Activities, Ganjiang River Basin, Contribution Rate

Abstract

This study delineates the baseflow processes in the Ganjiang River Basin using daily streamflow data from 1980 to 2019, and analyzes the variations in baseflow depth and the Baseflow Index (BFI) over the past 40 years. The trends, abrupt changes, and persistence of these parameters were examined. The contribution rates of climate change and human activities to baseflow variations were identified using the elasticity coefficient method. The results indicate that the baseflow processes separated by the three-digital filter method align well with the actual daily baseflow dynamics in the Ganjiang River Basin. Over the past four decades, both baseflow depth and BFI exhibited an insignificantly increasing trend with persistence. The baseflow depth is unevenly distributed within the year, predominantly in spring and summer, while BFI is higher in autumn and winter. The years of abrupt change for baseflow depth and BFI differ, with the former occurring earlier than the latter. Compared to the period of 1980-1991, human activities had a greater impact on baseflow depth during 1992-2019, while the influence of climate factors decreased. The average annual baseflow depth increased by 65.31 mm from 1992 to 2019 compared to the period of 1980-1991, with climate change being the primary contributing factor, accounting for 65.14% of the increase. Among climate factors, precipitation was the main contributor. Human activities contributed to a baseflow depth change of 22.77 mm, accounting for 34.86% of the total increase.

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