4.8 Article

Refining the concept of hydrological connectivity for large floodplain systems: Framework and implications for eco-environmental assessments

期刊

WATER RESEARCH
卷 195, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2021.117005

关键词

Hydrological connectivity; Threshold effect; Hydrodynamic model; Floodplain lake; Connectivity assessment; Ecological and environmental goals

资金

  1. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA23040202]
  2. National Key Research and Development Program [2019YFC0409002]
  3. Youth Innovation Promotion Association of the Chinese Academy of Sciences [Y9CJH01001]
  4. National Natural Science Foundation of China [42071036, 41771037]
  5. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences

向作者/读者索取更多资源

This study presents a framework to refine the concept of surface hydrological connectivity by combining hydrodynamic modeling experiments, threshold effects, and geostatistical connectivity analysis. Results show that the joint role of water depth and flow velocity has a more dynamic and complex effect on effective connectivity than other metrics. The floodplain is more sensitive than the lake's main flow channels under different connectivity conditions, and the lake-floodplain system exhibits dynamic threshold behavior with seasonally varying water depth and velocity thresholds.
Recent years, the hydrological connectivity has gained popularity in various research fields, however, its definition and threshold effects at a system scale have not received adequate attention. The current research proposes a promising framework to refine the concept of surface hydrological connectivity by combining hydrodynamic modeling experiments, threshold effects and geostatistical connectivity analysis, exemplified by the flood-pulse-influenced Poyang Lake floodplain system (China). To enhance the inherent linkage between hydrological connectivity and eco-environments, total connectivity (TC), general connectivity (GC), and effective connectivity (EC) were proposed to refine the metrics of hydrological connectivity. The results show that substantial differences between the three connectivity metrics are observed for all target directions, demonstrating that the joint role of water depth and flow velocity may produce more dynamic and complex influences on EC than the other two metrics of TC and GC. Topographically, the connectivity objects/areas within the flood pulse system reveal that the floodplain is a more sensitive area than the lake's main flow channels under different connectivity conditions. The modelling experimental studies show that variations in water depth thresholds are more likely to have a strong effect on connectivity for the dry, rising, and falling limbs, rather than the flooding period, while the flow velocity may exert an opposite threshold effect. The lake-floodplain system is characterized by a dynamic threshold behavior, with seasonally varying water depth and velocity thresholds. This study highlights the importance of redefined connectivity concept for facilitating scientific communication by combining hydrodynamic thresholds and offering recommendations for future connectivity assessments using our proposed metrics of TC, GC, and EC. (c) 2021 Elsevier Ltd. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据