Alteration of Hydrological Regimes at Yichang Hydrological Station of Three Gorges Reservoir Since Impoundment for Two Decades

ZHU Di; CUI Fu-ning; BU Hui; WANG Lin; WANG Han

doi:10.11988/ckyyb.20231386

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (6) : 193-199. DOI: 10.11988/ckyyb.20231386

Special Column on Innovative Development of Yangtze River Governance and Protection: Academic Symposium of the 20th Anniversary of Three Gorges Project Operation

Alteration of Hydrological Regimes at Yichang Hydrological Station of Three Gorges Reservoir Since Impoundment for Two Decades

ZHU Di¹, CUI Fu-ning², BU Hui¹, WANG Lin¹, WANG Han¹

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Abstract

The Three Gorges Reservoir, impounded since 2003 for 20 years, has played a crucial role in flood prevention, hydropower generation, navigation, water resource utilization, and ecological environmental protection. However, its operation has also impacted downstream hydrological regimes. We analyzed daily runoff and water level data from the Yichang hydrological station spanning from 1950 to 2022. Applying the MASH (Moving Average over Shifting Horizon), Sen slope, and IHA/RVA methods, we quantitatively assessed the alterations in hydrological regimes following the Three Gorges Reservoir operation. Findings revealed significant trends in moving-average runoff, with increases during January-May and decreases during September-November, as well as decreasing moving-average water levels from June to December. Fourteen IHA (Indicators of Hydrologic Alteration) showed substantial alterations, resulting in an overall alteration of 63.52%, classified as moderate. The Three Gorges Reservoir notably enhanced the median values of annual minimum flow components and the number of flow reversals while decreasing the median values of annual maximum 1-day flow through streamflow regulation. These adjustments reflect the reservoir’s multifaceted benefits for flood control and hydropower generation. The research outcomes offer valuable insights for managing water resources within the Three Gorges Reservoir.

Key words

Three Gorges Reservoir / hydrological regime / MASH method / IHA/RVA method / Yichang hydrological station

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ZHU Di, CUI Fu-ning, BU Hui, WANG Lin, WANG Han. Alteration of Hydrological Regimes at Yichang Hydrological Station of Three Gorges Reservoir Since Impoundment for Two Decades[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(6): 193-199 https://doi.org/10.11988/ckyyb.20231386

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