Water exchange and hydrodynamic responses to multi-phase restoration of tidal flat in Luanhe river estuary

IF 6.3 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-09-21 DOI:10.1016/j.jhydrol.2025.134299

Yinyi Li , Baolong Zhang , Zhe Huang , Gang Wang , Haijue Xu , Yuchuan Bai

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引用次数: 0

Abstract

The tidal flat restoration has been carried out to reconstruct the natural habitats from large-scale aquaculture reclamations in the Luanhe River Estuary. However, the impacts of the project on water exchange has not yet been fully established, which further limits the understanding of the environmental diffusion in the estuary. This study aims to investigate the evolution of hydrodynamics and water exchange due to multi-phase restoration projects, from the perspective of water age. The results indicate that the riverine discharge provides more dominance than the tidal flow in this typical micro-tidal estuary. The discharge directly determines the intensity of water exchange, while the tidal flow only cause minimal fluctuations in the water age. The first-phase restoration projection widens the river channel to facilitate the interaction between riverine discharge and tidal flow. The implementation of the restoration decreases the water age, indicating an enhancement in the water exchange process. This effect is particularly noticeable during the dry season when the riverine discharge is weaker to restrict the water exchange, as evidenced by a 5.8% and 16.3% increase in lower water age area in the flood and dry seasons, respectively. The upstream flow of tidal currents is strengthened by the restoration to significantly improve the exchange intensity of runoff and tide. The evaluation of multi-phase projects show that the spatial layout of the restoration also makes diverse effectiveness. In such a weak tidal estuary, the restoration significantly changed the runoff, can effectively promote water exchange by improving the interaction between runoff and tide with the area of lower water age increasing by 51.1%. On the contrary, the improvement of water exchange by seaside restoration is limited with the area of lower water age increasing by only 9.6%. While, thorough restoration is crucial to further enhance the water exchange process for a long term. The results can provide valuable insights for the planning and implementation of future restoration to achieve greater ecological benefits.

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滦河河口潮滩多期修复的水交换与水动力响应

为重建滦河河口大规模水产养殖后的自然生境，进行了滩涂恢复。然而，工程对水交换的影响尚未完全确定，这进一步限制了对河口环境扩散的认识。本研究旨在从水龄的角度探讨多期修复工程对水动力和水交换的影响。结果表明，在典型的微潮河口，河流流量的优势大于潮流。流量直接决定了水交换的强度，而潮汐流量只引起最小的水龄波动。一期修复工程拓宽河道，促进河道流量与潮流的相互作用。修复的实施降低了水龄，表明水交换过程的增强。这种影响在旱季尤为明显，此时河流流量对水交换的限制作用较弱，低水龄面积在汛期和旱季分别增加了5.8%和16.3%。恢复加强了潮流的上游流动，显著提高了径流与潮汐的交换强度。对多期工程的评价表明，修复的空间布局也产生了不同的效果。在这种弱潮汐河口，恢复显著改变了径流，通过改善径流与潮汐的相互作用，有效促进了水交换，低水龄面积增加了51.1%。相反，滨海恢复对水交换的改善有限，低水龄面积仅增加了9.6%。然而，彻底的修复对于进一步加强长期的水交换过程至关重要。研究结果可以为未来的修复规划和实施提供有价值的见解，以实现更大的生态效益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.