Analytic Modeling of Transient Multilayer Flow

Bakker, Mark

doi:10.1007/978-1-4614-6479-2_5

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…In practice, multi-layer analytic elements are the most versatile for the simulation of HWs and RCWs. Multi-layer line-sinks were developed for steady flow (Bakker and Strack 2003) and transient flow (Bakker 2013a). The aquifer is divided into a number of layers, where the thickness of the layer at the depth of a lateral is equal to the diameter of the lateral; line-sinks that represent a lateral are placed in this layer.…”

Section: Analytical Element Modelsmentioning

confidence: 99%

Review: Horizontal, directionally drilled and radial collector wells

et al. 2022

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Horizontal wells play an often overlooked role in hydrogeology and aquifer remediation but can be an interesting option for many applications. This study reviews the constructional and hydraulic aspects that distinguish them from vertical wells. Flow patterns towards them are much more complicated than those for vertical wells, which makes their mathematical treatment more demanding. However, at some distance, the drawdown fields of both well types become practically identical, allowing simplified models to be used. Due to lower drawdowns, the yield of a horizontal well is usually higher than that of a vertical well, especially in thin aquifers of lower permeability, where they can replace several of the latter. The lower drawdown, which results in lower energy demand and slower ageing, and the centralized construction of horizontal wells can lead to lower operational costs, which can make them an economically feasible option.

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Section: Analytical Element Modelsmentioning

confidence: 99%

Review: Horizontal, directionally drilled and radial collector wells

et al. 2022

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The effect of loading efficiency on the groundwater response to water level changes in shallow lakes and streams

Bakker

2016

Water Resources Research

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The loading efficiency (sometimes called the tidal efficiency) is often neglected when simulating the head response in an aquifer to water level changes in lakes and streams. This is not appropriate when the lake or stream only partially penetrates the aquifer. In such cases, the aquifer extends below the lake or stream and is hydraulically connected through a semiconfining layer of lower permeability. The loading efficiency is the ratio between the instantaneous head response below a lake or stream and the water level change in the lake or stream. In sand and clay, whose particles are not cemented together, the instantaneous head response below a stream or lake is nearly equal to the stage change, and the loading efficiency is close to 1. New semianalytic solutions are presented for the groundwater response to water level changes in shallow lakes and streams that account for the loading efficiency of the aquifer. It is shown that the loading efficiency may have a significant effect on the head response. The effect is larger for larger values of the vertical resistance of the semiconfining layer and larger width of the stream and is much more pronounced in confined aquifers than in unconfined aquifers. The importance of the loading efficiency declines with time and with distance from the lake or stream. Graphs are presented that may be used to determine whether a certain combination of parameters gives a significant difference in the head at the lake shore or river bank when the loading efficiency is taken into account.

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Modelado semianalítico de flujo multicapa transitorio con TTim

Bakker

2013

Hydrogeol J

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Analytic Modeling of Transient Multilayer Flow

Cited by 4 publications

References 29 publications

Review: Horizontal, directionally drilled and radial collector wells

Review: Horizontal, directionally drilled and radial collector wells

The effect of loading efficiency on the groundwater response to water level changes in shallow lakes and streams

Modelado semianalítico de flujo multicapa transitorio con TTim

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