人民长江2026，Vol.57Issue(5)：1-8,27,9.DOI:10.16232/j.cnki.1001-4179.2026.05.001
鄱阳湖入江水道冲淤变化对湖区水动力影响分析
Analysis on effects of erosion and deposition of Poyang Lake outlet channel into Changjiang River on hydrodynamics of lake area
摘要
Abstract
Affected by human activities,the Poyang Lake outlet channel into the Yangtze River has undergone significant erosion over the past 20 years,which has profoundly impacted the hydrodynamic processes of the lake area receiving water from the five major rivers and flowing out of the lake area.A high-precision 2D hydrodynamic model was constructed based on measured cross-section and hydrological data.Four scenarios were designed using the model:original condition,slight erosion(-0.5 m),mod-erate erosion(-1 m),and severe erosion(-2 m).The influence of erosion and deposition changes in the Poyang Lake outlet channel on the hydrodynamics of the lake area was quantitatively analyzed.The results show that:① Spatially,the northern lake area(Hukou-Duchang section)responds most significantly to erosion.Under strong erosion,the water level at Duchang Station decreases by0.55 m in the dry season(January),and the average flow velocity in the river channel section decreases by 0.05 m/s.In contrast,the southern lake area(Tangyin-Kangshan section)shows a weak response,with an average water level de-crease of 0.1 m and a velocity increase of 0.01 m/s.② Temporally,the response of Poyang Lake to erosion is strongest in the dry season(January),resulting in a marked water level decline and increased outflow from the lake area.In the wet season(July),due to large inflow and high water levels,the lake is almost unaffected,with water level differences at stations under different sce-narios less than 0.01 m.③ As the degree of erosion increases,the discharge at the lake outlet increases,with a maximum increase of190 m3/s,and the daily average discharge rises by5.48%.④ Under strong erosion,the 30-day flood regulation capacity of Poyang Lake decreases from 6.979 billion m3 to 6.931 billion m3,and the flood storage ratio decreases from 25.99%to 25.81%.⑤ The area of Poyang Lake decreases with increasing erosion intensity.Under strong erosion,the maximum reduction in water level occurs during the rising period(March),with a decrease of 43.12 km2(-2.27%),while during the wet season(July),the reduction is only6.37 km2(-0.21%).These findings reveal the influence of erosion and deposition of the Poyang Lake outlet channel into the Yangtze River on the lake area's hydrodynamics,characterized by spatial differences(strong in the north,weak in the south)and seasonal heterogeneity(strong in dry seasons,weak in wet seasons).This can provide a reference for flood and drought control of Poyang Lake and the construction of hub projects.关键词
入江水道/冲淤变化/水动力响应/数值模拟/鄱阳湖Key words
outlet channel into the river/erosion and deposition/hydrodynamic response/numerical simulation/Poyang Lake分类
建筑与水利引用本文复制引用
郭公林,栾华龙,吕超凡,何子灿,杨忠勇,胡怡玲..鄱阳湖入江水道冲淤变化对湖区水动力影响分析[J].人民长江,2026,57(5):1-8,27,9.基金项目
国家自然科学基金长江水科学研究联合基金项目(U2240224) （U2240224）
国家自然科学基金项目(42376166,42430406) （42376166,42430406）
水利部重大科技项目(SKS-2022074) （SKS-2022074）
中央级公益性科研院所基本科研业务费项目(CKSF2025153/HL) （CKSF2025153/HL）
