A coupled model of surface water-groundwater interaction with the effect of riverbed deformation in the alluvial channel

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Linlin Li , Hang Li , Genguang Zhang , Defu Liu , Yao Xiao , Ying Liu , Jiahao Zou
{"title":"A coupled model of surface water-groundwater interaction with the effect of riverbed deformation in the alluvial channel","authors":"Linlin Li ,&nbsp;Hang Li ,&nbsp;Genguang Zhang ,&nbsp;Defu Liu ,&nbsp;Yao Xiao ,&nbsp;Ying Liu ,&nbsp;Jiahao Zou","doi":"10.1016/j.catena.2025.109193","DOIUrl":null,"url":null,"abstract":"<div><div>Hyporheic exchange process is a common mode of surface water-groundwater interaction, involving the transport of substances, nutrients and energy, which is an important foundation for river ecology. However, the effect of riverbed deformation driven by weir in natural rivers remains unclear. In this study, the effect of local scour pit created by low-head weirs on hyporheic exchange process was studied by the coupled model of surface water-groundwater. While many studies assume static riverbed conditions, this study integrates a dynamic surface water model that accounts for sediment transport and evolving scour pits, while employing a steady-state representation for subsurface flow to reflect the gradual adjustment of hyporheic exchange. The variation of the local scour depth, hyporheic exchange flux, hyporheic zone pressure field and temperature response area were investigated under different weir height and flow discharge. The results showed that: (a) the increasing weir height significantly enhanced hydrodynamic effect, with the morphological changes in scour pits altering the distribution of hyporheic zone pressure field and further intensifying surface water-groundwater exchange; (b) when the weir height increased from 15 cm to 25 cm, the scour pit depth increased from 9 cm to 25 cm, the volume of the local scour pit increased by approximately 3.3 times, and the hyporheic exchange flux increased to a maximum value of 0.011 m<sup>2</sup>/s; (c) the peak downwelling Darcy velocity in the hyporheic zone increased from 0.0039 m/s to 0.0067 m/s as the flow discharge increased from 0.0621 m<sup>3</sup>/s to 0.1200 m<sup>3</sup>/s; (d) the scour pit formation altered the local bed topography, then influencing the hyporheic exchange pathways and rates; the peak downwelling Darcy velocity with the riverbed scouring effect was 2.5 times higher than that of the others, with the hyporheic exchange flux increasing by 1.5 times. This study can provide theoretical insights for optimizing low-head weir designs and water management in river ecological restoration.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109193"},"PeriodicalIF":5.4000,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catena","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0341816225004953","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

Abstract

Hyporheic exchange process is a common mode of surface water-groundwater interaction, involving the transport of substances, nutrients and energy, which is an important foundation for river ecology. However, the effect of riverbed deformation driven by weir in natural rivers remains unclear. In this study, the effect of local scour pit created by low-head weirs on hyporheic exchange process was studied by the coupled model of surface water-groundwater. While many studies assume static riverbed conditions, this study integrates a dynamic surface water model that accounts for sediment transport and evolving scour pits, while employing a steady-state representation for subsurface flow to reflect the gradual adjustment of hyporheic exchange. The variation of the local scour depth, hyporheic exchange flux, hyporheic zone pressure field and temperature response area were investigated under different weir height and flow discharge. The results showed that: (a) the increasing weir height significantly enhanced hydrodynamic effect, with the morphological changes in scour pits altering the distribution of hyporheic zone pressure field and further intensifying surface water-groundwater exchange; (b) when the weir height increased from 15 cm to 25 cm, the scour pit depth increased from 9 cm to 25 cm, the volume of the local scour pit increased by approximately 3.3 times, and the hyporheic exchange flux increased to a maximum value of 0.011 m2/s; (c) the peak downwelling Darcy velocity in the hyporheic zone increased from 0.0039 m/s to 0.0067 m/s as the flow discharge increased from 0.0621 m3/s to 0.1200 m3/s; (d) the scour pit formation altered the local bed topography, then influencing the hyporheic exchange pathways and rates; the peak downwelling Darcy velocity with the riverbed scouring effect was 2.5 times higher than that of the others, with the hyporheic exchange flux increasing by 1.5 times. This study can provide theoretical insights for optimizing low-head weir designs and water management in river ecological restoration.
冲积河道中地表-地下水相互作用与河床变形影响的耦合模型
潜流交换过程是地表水与地下水相互作用的一种常见模式,涉及物质、养分和能量的输送,是河流生态学的重要基础。然而,在天然河流中,由堰驱动的河床变形对河流的影响尚不清楚。本文采用地表水-地下水耦合模型,研究了低水头堰形成的局部冲刷坑对潜流交换过程的影响。虽然许多研究假设静态河床条件,但本研究整合了一个考虑沉积物输运和演变冲刷坑的动态地表水模型,同时采用稳态表示来反映地下水流的逐渐调整。研究了不同堰高和流量条件下局部冲刷深度、潜流交换通量、潜流区压力场和温度响应区的变化规律。结果表明:(a)堰高的增加显著增强了水动力效应,冲刷坑形态的变化改变了潜流带压力场的分布,进一步加剧了地表水-地下水的交换;(b)当堰高从15 cm增加到25 cm时,冲刷坑深度从9 cm增加到25 cm,局部冲刷坑体积增加约3.3倍,潜流交换通量增加到最大值0.011 m2/s;(c)当流量从0.0621 m3/s增加到0.1200 m3/s时,下潜带达西流速峰值从0.0039 m/s增加到0.0067 m/s;(d)冲刷坑的形成改变了当地的河床地形,从而影响了潜流交换途径和速率;达西流速峰值随河床冲刷作用增大2.5倍,潜流交换通量增大1.5倍。该研究可为河流生态修复中低水头堰的优化设计和水管理提供理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信