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    Impact of Transient Flow on Subsurface Solute Transport with Exponentially Time-Dependent Flow Velocity

    Source: Journal of Hydrologic Engineering:;2018:;Volume ( 023 ):;issue: 007
    Author:
    Li Xu;Zhan Hongbin;Wen Zhang
    DOI: 10.1061/(ASCE)HE.1943-5584.0001679
    Publisher: American Society of Civil Engineers
    Abstract: The groundwater flow velocity might be temporally variable instead of being a constant as most analytical solutions of solute transport in the subsurface commonly assume. This study investigates the impact of transient flow on solute transport in the subsurface with time-dependent groundwater flow velocity. This study is based on the analysis of breakthrough and leaching processes of solute transport in a one-dimensional (1D) setting. As an example, the flow velocity is assumed to follow an exponential function of time and eventually approaches its steady-state value. Analytical solutions of such models are obtained using the Laplace transform assuming a homogeneous media and Fickian type of dispersion, and the impacts of different parameters of the temporally exponential function of the groundwater flow velocity on solute transport are thoroughly analyzed. The results indicate that a larger power index in the temporally and exponentially decreasing velocity equation results in a faster solute transport process. A sensitivity analysis of parameters shows that the solute transport is most sensitive to the initial flow velocity for the case with exponentially increasing velocity, whereas it is most sensitive to the final steady-state velocity for the case with exponentially decreasing velocity. The general conclusion is that groundwater flow transiency usually has significant impacts on the solute transport process and should not be overlooked.
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      Impact of Transient Flow on Subsurface Solute Transport with Exponentially Time-Dependent Flow Velocity

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    contributor authorLi Xu;Zhan Hongbin;Wen Zhang
    date accessioned2019-02-26T07:44:24Z
    date available2019-02-26T07:44:24Z
    date issued2018
    identifier other%28ASCE%29HE.1943-5584.0001679.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4249027
    description abstractThe groundwater flow velocity might be temporally variable instead of being a constant as most analytical solutions of solute transport in the subsurface commonly assume. This study investigates the impact of transient flow on solute transport in the subsurface with time-dependent groundwater flow velocity. This study is based on the analysis of breakthrough and leaching processes of solute transport in a one-dimensional (1D) setting. As an example, the flow velocity is assumed to follow an exponential function of time and eventually approaches its steady-state value. Analytical solutions of such models are obtained using the Laplace transform assuming a homogeneous media and Fickian type of dispersion, and the impacts of different parameters of the temporally exponential function of the groundwater flow velocity on solute transport are thoroughly analyzed. The results indicate that a larger power index in the temporally and exponentially decreasing velocity equation results in a faster solute transport process. A sensitivity analysis of parameters shows that the solute transport is most sensitive to the initial flow velocity for the case with exponentially increasing velocity, whereas it is most sensitive to the final steady-state velocity for the case with exponentially decreasing velocity. The general conclusion is that groundwater flow transiency usually has significant impacts on the solute transport process and should not be overlooked.
    publisherAmerican Society of Civil Engineers
    titleImpact of Transient Flow on Subsurface Solute Transport with Exponentially Time-Dependent Flow Velocity
    typeJournal Paper
    journal volume23
    journal issue7
    journal titleJournal of Hydrologic Engineering
    identifier doi10.1061/(ASCE)HE.1943-5584.0001679
    page4018030
    treeJournal of Hydrologic Engineering:;2018:;Volume ( 023 ):;issue: 007
    contenttypeFulltext
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