Numerical analysis of the hyporheic flow effect on solute transport in surface water

Jun Song Kim

doi:10.3741/JKWRA.2022.55.1.23

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2022 Vol.55, Issue 1 Preview Page Next Page

Research Article

Numerical analysis of the hyporheic flow effect on solute transport in surface water 혼합대 흐름이 지표수 내 용질거동에 미치는 영향 수치모의 분석

31 January 2022. pp. 23-32

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Abstract

본 연구는 지표수-지하수 연계 2차원 흐름 및 용질거동 수치모의를 통해 혼합대 흐름에 의한 지표수-하상 경계층 용질교환이 지표수 내 용질거동에 미치는 영향을 분석하였다. 먼저, 혼합대 흐름이 부재한 불투수성 하상의 경우 사련 하상파에 의해 발달한 바닥면 근처 재순환 흐름의 포착 효과가 용질 파과곡선 형태를 결정하였다. 반면, 용질이 혼합대로 유입되는 투수성 하상에서는 지표수 대비 유속이 느린 혼합대 흐름에 의해 파과곡선 꼬리 부분 농도가 증가하여 파과곡선 꼬리 연장이 급격히 증가하였다. 또한, 지표수 유속 증가는 바닥면 압력 상승과 함께 혼합대 흐름을 빠르게 하여 파과곡선 꼬리의 연장을 단축시켰다. 이러한 본 연구의 결과는 지표수 내 용질 체류시간 예측에 있어 혼합대 흐름의 중요성을 시사하는 바이다.

Keywords

Hyporheic zone

Solute transport

Ripple bed

Breakthrough curve

Numerical simulation

This paper performs two-dimensional numerical simulation of surface water-groundwater coupled flow and solute transport to investigate the effect of the hyporheic exchange at the sediment-water interface (SWI) on surface solute transport. For the impermeable bed case in the absence of hyporheic flow, the trapping effect of flow recirculation associated with the ripple bed controls the shape of breakthrough curves (BTCs). However, the permeable bed case with hyporheic flow stimulates the extended tailing of the BTCs more significantly due to the elevated concentration of the BTC tailing resulting from slow hyporheic velocity. Also, the increased bottom pressure at the SWI with an increase in surface velocity shortens the BTC tailing because of increasing hyporheic velocity. These results infer that hyporhiec flow is critically important in predicting solute residence times in surface water.

키워드

혼합대

용질거동

사련하상

파과곡선

수치모의

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Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 55
No :1
Pages :23-32
Received Date : 2021-10-07
Revised Date : 2021-11-03
Accepted Date : 2021-11-19
DOI :https://doi.org/10.3741/JKWRA.2022.55.1.23

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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