An experimental study on the correlation of hydraulic mean radius and hydrodispersive parameters in rockfill porous media

Ilyeong Han; Jaejoung Lee; Gyoo Bum Kim

doi:10.3741/JKWRA.2021.54.11.863

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2021 Vol.54, Issue 11 Preview Page Next Page

Research Article

An experimental study on the correlation of hydraulic mean radius and hydrodispersive parameters in rockfill porous media 자갈 다공성매질에서 수리평균반경과 수리분산 매개변수의 상관성에 관한 실험적 연구

30 November 2021. pp. 863-873

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Abstract

The mechanical dispersion which dominates solute transport in porous media is caused by the difference in flow velocity within pores. Longitudinal dispersion coefficient and longitudinal dispersivity that are hydro-dispersive parameters of advection-dispersion equation can only be obtained by experiment. Hydraulic mean radius that represents the amount and intensity of flowing water within pores can be obtained by the formula using the factors for physical properties. A slug injection test was conducted and a power type empirical formula for obtaining a longitudinal dispersivity using a hydraulic mean radius in rockfill porous media was derived. It is possible to obtain the longitudinal dispersivity depending on transport distance because it contains a formula for a scale constant, and expected to be applicable to waterways filled with homogeneous gravel and small flow rate.

Keywords

Longitudinal dispersion coefficient

Longitudinal dispersivity

Hydraulic mean radius

Slug injection test

Scale constant

다공성 매질에서 오염물 이동에 지배적인 기작인 역학적 분산은 공극 내 유속 차이에 의해서 발생한다. 종분산계수와 종분산지수는 이송확산 모형의 수리분산 매개변수이며, 실험을 통하여 얻어야만 한다. 수리평균반경은 공극 내 물의 흐름 양의 크기와 강도를 표현할 수 있으며, 매질의 물리적 특성인자를 이용하여 계산할 수 있다. 본 연구는 순간주입 추적자실험을 통하여 자갈 다공성매질에서 수리평균반경을 이용하여 종분산지수를 구할 수 있는 거듭제곱형의 경험식을 도출하였다. 경험식은 스케일상수 계산식이 포함되어 있어 이동거리에 따른 종분산지수의 산정이 가능하며, 소규모 유량의 균질한 자갈로 구성된 수로에 적용이 가능할 것으로 기대된다.

키워드

종분산계수

종분산지수

수리평균반경

순간주입 추적자실험

스케일상수

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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 : 54
No :11
Pages :863-873
Received Date : 2021-07-12
Revised Date : 2021-08-30
Accepted Date : 2021-08-30
DOI :https://doi.org/10.3741/JKWRA.2021.54.11.863

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

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