Quantifying the impacts of a proposed hydraulic dam on groundwater flow behaviors and its eco-environmental implications in the large Poyang Lake-floodplain system

被引：10

作者：

Li, Yunliang ^{[1
]}

Cao, Sijia ^{[2
]}

Yu, Lina ^{[3
]}

Yao, Jing ^{[1
]}

Lu, Jianzhong ^{[4
]}

机构：

[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, 73 East Beijing Rd, Nanjing 210008, Peoples R China

[2] North China Univ Water Resources & Elect Power, Coll Geosci & Engn, 36 Beihuan Rd, Zhengzhou 450045, Peoples R China

[3] Inst Ecol Geol Survey & Res Heilongjiang Prov, 29 Diantan Rd, Harbin 150030, Peoples R China

[4] Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & Re, 129 Luoyu Rd, Wuhan 430079, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2023年 / 336卷

基金：

中国国家自然科学基金;

关键词：

Hydraulic dam; Lake-groundwater interactions; Lake hydrodynamic model; Groundwater flow model; Integrated simulation; Eco-environmental management; HYDROLOGICAL ALTERATIONS; YANGTZE-RIVER; YELLOW-RIVER; BASIN; MOUNTAINS;

D O I：

10.1016/j.jenvman.2023.117654

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Dam-induced hydrological alterations and eco-environmental impacts have significant implications, however, these concern issues in large floodplain systems are less well understood. The present study shows a first attempt to adopt a quasi-three-dimensional groundwater flow modeling FEFLOW (Finite Element subsurface FLOW system) to investigate the influences of a proposed hydraulic dam on groundwater dynamics in the largest floodplain lake of the Yangtze River basin (Poyang Lake, China). The FEFLOW model was successfully con-structed and has the ability to represent the hydrodynamics of floodplain groundwater flow. Model simulations indicate that, in general, the dam is likely to increase the groundwater levels across the floodplain during different hydrological phases. The responses of floodplain groundwater levels to the dam during the dry and recession phases are stronger (-2-3 m) than the rising and flooding phases (<2 m). Under the natural condition, the floodplain groundwater may recharge the lake during the dry and recession phases, and discharge the lake during the rising and flooding phases. However, the dam regulation may alter the natural recharge-discharge patterns, forming a generally gaining condition of the floodplain groundwater. The proposed dam is most likely to reduce the groundwater flow velocity (-<1 m/d) relative to the natural condition (up to 2 m/d) during different hydrological phases, and it may also alter the floodplain groundwater flow direction during the dry and recession phases. Additionally, the floodplain groundwater system is mainly characterized by losing state (-4.5 x 106 m3/yr) under the natural condition, while the dam-induced groundwater system exhibits an overall gaining state (9.8 x 106 m3/yr). The current research findings contribute to future water resources assessment and management by providing a foundation for assessing associated eco-environmental changes of the large lake-floodplain system.

引用

页数：11