首页|Assessment of hydraulic performance changes of Dongting Lake after the Three Gorges Reservoir impoundment by a novel semi-empirical approach

Assessment of hydraulic performance changes of Dongting Lake after the Three Gorges Reservoir impoundment by a novel semi-empirical approach

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Floodplain lakes are important water storage areas in lowland regions that often undergo geomorphologic evolution,and timely topographic data are generally unavailable.In this study,to assess the impacts of lakebed deformation on hydraulic performance in Dong-ting Lake,a set of semi-empirical methods was proposed to establish performance graphs(PGs)using only hydrological data.These methods were used to evaluate the changes in water level,storage capacity,and flood detention ability in Dongting Lake caused by topo-graphic adjustment after the Three Gorges Reservoir impoundment.These methods showed that PGs can effectively simulate the water level and outflow processes of Dongting Lake with Nash-Sutcliffe efficiency coefficients(NSEs)above 0.9.A comparison of the estimated water level and discharge using PGs from different periods suggested that bed erosion in Dongting Lake caused water level decreases of 0.18 m and 0.32 m during the flood and dry seasons,respectively.Because the magnitude of erosion at high elevations in the lake is small,the impacts of bed adjustment on the storage capacity and flood detention ability are not currently significant.This study showed that the hydraulic performance of a floodplain lake can be evaluated independently of topographic data under the condition of no reverse flows or neg-ative water surface slopes.

Dongting Lakehydraulic performance graphbed adjustmentsemi-empirical approachbackwater effect

SUN Zhaohua、LI Zhiqing、CHEN Li、FAN Jiewei、LIU Ya

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State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China

Yellow River Water & Hydropower Development Group Co.,Ltd.,Jiyuan 459017,Henan,China

Changjiang River Scientific Research Institute,Wuhan 430010,China

National Natural Science Foundation of ChinaFollowup Research Program for the Three Gorges Project from the Ministry of Water Resources of China

5187919812630100100020J005

2024

10.1007/s11442-024-2260-9

地理学报(英文版)
中国地理学会,中国科学院地理科学与资源研究所

地理学报(英文版)

CSTPCD
影响因子：1.307
ISSN：1009-637X
年,卷(期)：2024.34(8)
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