Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China

Water level is considered as the key factor affecting the structure and function of lake ecosystems. The Mann-Kendall technique and range of variability approach (RVA) were used to quantitatively evaluate the hydrologic alteration due to Three Gorges Reservoir (TGR) in Dongting Lake. Results indicat...

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Autores principales:	Hongxiang Wang, Yongwei Zhu, Hufei Zha, Wenxian Guo
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	dongting lake hydrologic alteration degree three gorges reservoir water level Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/c5f14bb639b7464aab76e28373f95781
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spelling	oai:doaj.org-article:c5f14bb639b7464aab76e28373f957812021-11-06T07:12:38ZQuantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China1606-97491607-079810.2166/ws.2020.369https://doaj.org/article/c5f14bb639b7464aab76e28373f957812021-05-01T00:00:00Zhttp://ws.iwaponline.com/content/21/3/1188https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Water level is considered as the key factor affecting the structure and function of lake ecosystems. The Mann-Kendall technique and range of variability approach (RVA) were used to quantitatively evaluate the hydrologic alteration due to Three Gorges Reservoir (TGR) in Dongting Lake. Results indicate the following. (1) The average annual water levels at Chenglingji station showed increasing trends (p < 0.05), while that at Nanzui station showed a decreasing trend (p < 0.05). The turning year occurred in 2003, which reflects the significant effects of the TGR on the water level regime. (2) The highly altered parameters were 1-, 3-, and 7-day minimum water levels both at Chenglingji and Yangliutan, and in October both at Nanzui and Yangliutan, with the degree of hydrologic alteration being larger than 80%. However, 1-, 3-, 7-, and 30-day maximum water levels at three stations had relatively small alteration, with the degree of hydrologic alteration being smaller than 41%. (3) The hydrologic alteration degrees at Chenglingji, Nanzui and Yangliutan station were all moderate, with changes of 50, 46 and 49%, respectively. (4) Water level regimes at Dongting Lake were mainly jointly affected by reservoir operation, land utilization change and river channelization. These changes in water level regimes have a negative impact on aquatic and terrestrial ecosystems. This study provides a scientific reference for the protection of lake ecosystems under hydrologic alteration. HIGHLIGHTS Statistically characterize the trend and variability of water level regimes in Dongting Lake from 1959 to 2016.; Quantitively evaluate the water level regime alterations caused by the TGR by comparing the pre- and post-reservoir periods with RVA.; Water level regimes at Dongting Lake were mainly jointly affected by reservoir operation, land utilization change and river channelization.;Hongxiang WangYongwei ZhuHufei ZhaWenxian GuoIWA Publishingarticledongting lakehydrologic alteration degreethree gorges reservoirwater levelWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 3, Pp 1188-1201 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	dongting lake hydrologic alteration degree three gorges reservoir water level Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	dongting lake hydrologic alteration degree three gorges reservoir water level Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Hongxiang Wang Yongwei Zhu Hufei Zha Wenxian Guo Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China
description	Water level is considered as the key factor affecting the structure and function of lake ecosystems. The Mann-Kendall technique and range of variability approach (RVA) were used to quantitatively evaluate the hydrologic alteration due to Three Gorges Reservoir (TGR) in Dongting Lake. Results indicate the following. (1) The average annual water levels at Chenglingji station showed increasing trends (p < 0.05), while that at Nanzui station showed a decreasing trend (p < 0.05). The turning year occurred in 2003, which reflects the significant effects of the TGR on the water level regime. (2) The highly altered parameters were 1-, 3-, and 7-day minimum water levels both at Chenglingji and Yangliutan, and in October both at Nanzui and Yangliutan, with the degree of hydrologic alteration being larger than 80%. However, 1-, 3-, 7-, and 30-day maximum water levels at three stations had relatively small alteration, with the degree of hydrologic alteration being smaller than 41%. (3) The hydrologic alteration degrees at Chenglingji, Nanzui and Yangliutan station were all moderate, with changes of 50, 46 and 49%, respectively. (4) Water level regimes at Dongting Lake were mainly jointly affected by reservoir operation, land utilization change and river channelization. These changes in water level regimes have a negative impact on aquatic and terrestrial ecosystems. This study provides a scientific reference for the protection of lake ecosystems under hydrologic alteration. HIGHLIGHTS Statistically characterize the trend and variability of water level regimes in Dongting Lake from 1959 to 2016.; Quantitively evaluate the water level regime alterations caused by the TGR by comparing the pre- and post-reservoir periods with RVA.; Water level regimes at Dongting Lake were mainly jointly affected by reservoir operation, land utilization change and river channelization.;
format	article
author	Hongxiang Wang Yongwei Zhu Hufei Zha Wenxian Guo
author_facet	Hongxiang Wang Yongwei Zhu Hufei Zha Wenxian Guo
author_sort	Hongxiang Wang
title	Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China
title_short	Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China
title_full	Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China
title_fullStr	Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China
title_full_unstemmed	Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China
title_sort	quantitative assessment of water level regime alterations during 1959–2016 caused by three gorges reservoir in the dongting lake, china
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/c5f14bb639b7464aab76e28373f95781
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Quantitative assessment of water level regime alterations during 1959–2016 caused by Three Gorges Reservoir in the Dongting Lake, China

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