University of Oulu

Ali Torabi Haghighi, Navid Yaraghi, Mehmet Emin Sönmez, Hamid Darabi, Gülşen Kum, Ahmet Çelebi, Bjørn Kløve, An index-based approach for assessment of upstream-downstream flow regime alteration, Journal of Hydrology, Volume 600, 2021, 126697, ISSN 0022-1694,

An index-based approach for assessment of upstream-downstream flow regime alteration

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Author: Torabi Haghighi, Ali1; Yaraghi, Navid1; Sönmez, Mehmet Emin2;
Organizations: 1Water, Energy and Environmental Engineering Research Unit, University of Oulu, Oulu 90014, Finland
2Department of Geography, University of Gaziantep, Faculty of Arts and Sciences, Turkey
3Department of Environmental Engineering, Engineering Faculty, Sakarya University, 54050 Sakarya, Turkey
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.7 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-10-19


River regulation is challenging when there is diverse upstream and downstream interest, leading to regional and international conflict. However, quantifying the upstream-downstream flow regime changes and their causes are given less consideration in the river basin. In this study, we presented three new ratios for downstream-upstream low flow contribution (DUL), downstream-upstream high flow contribution ratio (DUH), and meteorological-hydrological drought ratio (MHD), for an integrated assessment of flow regime alteration across the river basin. To test the methods, we compared flow regime alteration upstream and downstream in the Ceyhan basin in central Turkey, which was significantly modified by agriculture between 1984 and 2018 (the irrigated area increased 2.8-fold, rainfed farming decreased by 67.6%). Our analysis revealed a clear change in the contribution of low and high flow seasons to annual flow in the last station of the river at Misis after 1984, but no considerable change in upstream tributaries. In the last decade (2005–2014) and the second half (1995–2014) of the study, the frequency of hydrological droughts increased, while meteorological droughts followed a stationary pattern. Evaluation of the impact of anthropogenic activities on river regime (by comparing flow regime characteristics after 1984 with those from 1975 to 1984 as post- and pre-impact periods) revealed low to incipient impact upstream (Hanköy, Karaahmet, and Kadirli river headwaters), severe impact below the Aslantaş dam in the basin center, and moderate impact at the last station on the Ceyhan river. The new metrics provide supplementary information on the flow regime alteration in the basin and can be introduced as a novel quantitative measure to recognize the driving factor of droughts.

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Series: Journal of hydrology
ISSN: 0022-1694
ISSN-E: 1879-2707
ISSN-L: 0022-1694
Volume: 600
Article number: 126697
DOI: 10.1016/j.jhydrol.2021.126697
Type of Publication: A1 Journal article – refereed
Field of Science: 1171 Geosciences
218 Environmental engineering
Copyright information: © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (