Aquifer Recharge Using a Vadose Zone Infiltration Well

Liang, Xiuyu; Li, Mingguang; Zhang, You‐Kuan

doi:10.1029/2018wr023409

Cited by 40 publications

(19 citation statements)

References 89 publications

(132 reference statements)

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“…On the basis of this treatment, the nonlinear Equation is reduced to a first‐order linearized equation and the water table is fixed at a known position. This linearized technique was widely employed to analytically solve nonlinear Richards equations (Chang et al., 2018; Liang et al., 2017a, 2017b, 2018a, 2018b; Lin et al., 2017; Mathias & Butler, 2006; Mishra & Neuman, 2010; Tartakovsky & Neuman, 2007). The details of the linearization of governing equations were presented in Appendix .…”

Section: Mathematical Modelmentioning

confidence: 99%

Effects of Unsaturated Flow on Hydraulic Head Response to Earth Tides–An Analytical Model

Liang

Wang

Ma³

et al. 2022

Water Resources Research

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Responses of groundwater levels to Earth tides have been widely studied to evaluate aquifer properties because it has been shown to be an economical and effective approach to estimate aquifer parameters. Existing studies suggest that unsaturated zones may have non‐negligible effects on groundwater responses to Earth tides in an unconfined aquifer. However, an analytical model for these effects is unavailable; as a result, the impacts of the unsaturated flow on the tidal response of water levels has not been fully explored. Here we present an analytical solution for the coupled unsaturated‐saturated flow equation, which is linearized by the perturbation method, to study the hydraulic head responses to Earth tides. The solutions are compared with that from numerical simulation using the finite‐element method built in COMSOL Multiphysics and an existing numerical model. The results indicate that the unsaturated zone has significant impacts on the hydraulic head responses to Earth tides. The traditional model for an unconfined aquifer that neglects the effects of an unsaturated zone commonly underestimates the amplitude ratio and overestimates the phase shift. The fluctuations of the water table near the ground surface (<1.0 m) causes dramatic variations of both amplitude ratio and phase shift, which in turn cause the traditional model to fail in estimating aquifer parameters. The solutions are applied to field data to interpret large seasonal variations in the tidal responses. The solutions derived in this study should be an important addition to existing analytical models for tidal analysis.

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Section: Mathematical Modelmentioning

confidence: 99%

Effects of Unsaturated Flow on Hydraulic Head Response to Earth Tides–An Analytical Model

Liang

Wang

Ma³

et al. 2022

Water Resources Research

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“…Green roofs are suitable for urban areas with high land prices as they do not occupy ground space, while they may not be suitable for areas with little precipitation because of the water demand of vegetation. The infiltration wells are suitable for groundwater recharge in arid and semi-arid areas with poor surface infiltration capacity, given their strong infiltration capacity [65]. Rainwater tanks and bioretention ponds are widely used.…”

Section: System Optimizationmentioning

confidence: 99%

Review on mechanism and technical measures of urban rainwater harvesting

Zhang

Ding

Liu

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The urban water problem has become one of the most significant problems hindering sustainable urban development. Rainwater harvesting and utilization is a green solution to alleviate the urban water problem. However, existing urban rainwater management pays more attention to flood control and lacks systematic planning for rainwater harvesting in China. In this paper, the calculation methods of rainwater harvesting potential are investigated, and the difference of rainwater harvesting system between the traditional model and sponge model is compared based on the rainwater harvesting mechanism. In addition, the study progress of four representative rainwater harvesting measures (green roofs, bioretention ponds, infiltration wells, and rainwater tanks) is reviewed and four representative optimization tools are listed. Moreover, we summarized the challenge of rainwater harvesting and provided recommendations for future research on the rainwater harvesting system. This review aims to provide theoretical support for the comprehensive utilization of urban rainwater resources to promote the sustainable development of cities.

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“…The trench has a depth of 3 m and a width of 1 m based on average values mentioned in the literature (Bouwer 2002;Schueler 1987). The vadose zone well is 5 m in depth and 1 m in diameter using the same criteria (Bouwer 2002;Liang et al 2018;Sasidharan et al 2019). In the shallow WT scenarios, the domain dimensions are set as 20 m in the vertical direction and 25 m in the horizontal one.…”

Section: Model Dimensionsmentioning

confidence: 99%

Stormwater harvesting in ephemeral streams: how to bypass clogging and unsaturated layers

et al. 2021

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To cope with water scarcity in drylands, stormwater is often collected in surface basins and subsequently stored in shallow aquifers via infiltration. These stormwater harvesting systems are often accompanied by high evaporation rates and hygiene problems. This is commonly a consequence of low infiltration rates, which are caused by clogging layers that form on top of the soil profile and the presence of a thick vadose zone. The present study aims to develop a conceptual solution to increase groundwater recharge rates in stormwater harvesting systems. The efficiency of vadose-zone wells and infiltration trenches is tested using analytical equations, numerical models, and sensitivity analyses. Dams built in the channel of ephemeral streams (wadis) are selected as a study case to construct the numerical simulations. The modelling demonstrated that vadose-zone wells and infiltration trenches contribute to effective bypassing of the clogging layer. By implementing these solutions, recharge begins 2250–8100% faster than via infiltration from the bed surface of the wadi reservoir. The sensitivity analysis showed that the recharge rates are especially responsive to well length and trench depth. In terms of recharge quantity, the well had the best performance; it can infiltrate up to 1642% more water than the reservoir, and between 336 and 825% more than the trench. Moreover, the well can yield the highest cumulative recharge per dollar and high recharge rates when there are limitations to the available area. The methods investigated here significantly increased recharge rates, providing practical solutions to enhance aquifer water storage in drylands.

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Aquifer Recharge Using a Vadose Zone Infiltration Well

Cited by 40 publications

References 89 publications

Effects of Unsaturated Flow on Hydraulic Head Response to Earth Tides–An Analytical Model

Effects of Unsaturated Flow on Hydraulic Head Response to Earth Tides–An Analytical Model

Review on mechanism and technical measures of urban rainwater harvesting

Stormwater harvesting in ephemeral streams: how to bypass clogging and unsaturated layers

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