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河流潜流交换时空变化的响应机理及识别方法研究进展
吴光东, 张潇, 朱苏葛, 宋权, 李云良, 鲁程鹏
raybet体育在线 院报 ›› 2025, Vol. 42 ›› Issue (9) : 42-50.
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河流潜流交换时空变化的响应机理及识别方法研究进展
Advances in Response Mechanisms and Identification Methods of Spatiotemporal Variations in Hyporheic Exchange in Rivers
潜流交换具有复杂的时空变异性,对河流生态功能维持、发挥和提升至关重要,然而目前学术界对潜流交换时空变化的响应机理仍缺乏系统和全面的认识。为深刻理解水热条件对潜流交换时空变化的影响,基于笔者多年实践经验,并结合已有文献,分别从水力学和热力学的视角,剖析潜流交换时空变异性的复杂响应机理,并提出能够提升潜流交换估算准确度的实践框架。研究发现,水文节律通过改变水头差驱动潜流交换动态变化,河流地形地貌、河床非均质性基于水头差空间分布,决定潜流交换空间变化,而日温剧烈变化和冻融循环则在时间和空间2个维度上影响潜流交换的时空变化;由于各驱动因子的非稳态变化及其耦合作用,潜流交换时空变异规律难以准确把握。针对潜流交换变异性大及目前潜流交换单个方法存在估算不准确、空间尺度不匹配等诸多局限性,提出了基于水力学方法、示踪方法、数值模拟的估算框架。研究成果可以为深入理解地下水水文学、完善基于潜流交换的河湖生态系统修复方案提供有价值的参考。
[Objective] This study aims to reveal the influence mechanisms of hydrothermal conditions on the spatiotemporal variability of hyporheic exchange and to develop more reliable estimation methods. We acknowledge the limitations of single methods and innovatively propose an estimation framework for hyporheic exchange that integrates hydraulic methods, environmental tracer methods, and numerical simulation technologies. The proposed method is expected to address the insufficient accuracy and scale mismatch in existing estimation methods and to enhance the capacity to quantify highly variable hyporheic exchange fluxes. [Methods] First, based on years of practical experiences, and combined with a systematic review and critical analysis of existing literature, we deeply analyze the intrinsic driving mechanisms of the spatiotemporal variability of hyporheic exchange from two core perspectives: hydraulics and thermodynamics. Second, we propose an integrated multi-method estimation framework to improve the accuracy and robustness of the estimation results. [Results] The mechanisms by which hydrothermal conditions drive the spatiotemporal variability of hyporheic exchange are summarized as follows.(1) Hydrological rhythm: the dynamic variations in river water level and discharge alter the hydraulic head difference between river water and groundwater, serving as the primary driver of the temporal changes in the rate and direction of hyporheic exchange.(2) Topography, geomorphology, and bed heterogeneity: local topographic features of rivers and lakes (such as sand bars, pools, and point bars) and the spatial heterogeneity of riverbed sediments shape the spatial distribution pattern of hydraulic head differences, which is the fundamental cause of significant spatial variations in hyporheic exchange.(3) Temperature variation: strong daily temperature differences can generate significant thermal gradients within riverbed sediments, inducing rapid flows and shaping the diurnal variation patterns of hyporheic exchange.(4) Seasonal freezing and thawing processes substantially alter the spatial structural characteristics of riverbed permeability, profoundly affecting both the intensity and spatial extent of hyporheic exchange at seasonal and spatial scales. These driving factors are often in a state of nonstationary variations and exhibit complex couplings. Collectively, their combined effects make the spatiotemporal variation patterns of the hyporheic exchange difficult to be accurately captured or predicted by simple methods. [Conclusion] This study systematically elucidates the mechanisms by which hydrothermal conditions jointly influence the complex spatiotemporal variations of hyporheic exchange through hydraulic and thermodynamic processes. It deepens the understanding of surface water-groundwater interactions, providing a theoretical basis and practical guidance for developing more accurate watershed hydrological models, assessing the health of river ecosystems, and formulating science-based ecological restoration strategies for rivers and lakes.
河流 / 潜流交换 / 时空变异性 / 生态功能 / 响应机理
river / hyporheic exchange / spatiotemporal variability / ecological function / response mechanism
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