Artificial aquifer recharge and pumping: transient analytical solutions for hydraulic head and impact on streamflow rate based on the spatial superposition method

Dewandel, Benoı̂t; Lanini, Sandra; Hakoun, Vivien; Caballero, Yvan; Maréchal, Jean-Christophe

doi:10.1007/s10040-020-02294-9

Cited by 5 publications

(4 citation statements)

References 48 publications

(85 reference statements)

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“…In order to model the response of the water table below the studied recharged basin, the analytical model developed by Dewandel et al (2021) which is based on the equations of Hantush (1965 and1967), was used. The model accounts for the aquifer characteristics (storage coefficient, permeability and aquifer thickness) and for the infiltration flow as a function of time (Eq.…”

Section: Analytical Modelling Of Groundwater Rechargementioning

confidence: 99%

“…Several authors have evaluated the feasibility of farm-level groundwater recharge (Arshad et al, 2014;Godwin et al, 2022) and the performance of farm-level well recharge structures (Soni et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The analytical solution developed by Hantush (1967) for assessing the growth and decay of the groundwater mound below an infiltration basin is used worldwide and very accurate compared to numerical modelling (Warner et al, 1989;Carleton, 2010). Recently, this solution has been adapted to the case where a pumping or recharge well is located near or inside the recharge area (Dewandel et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Managed groundwater recharge at the farm scale in pre-Saharan Morocco

Khardi,

Lacombe,

Dewandel

et al. 2024

Proc. IAHS

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Abstract. The oases of the pre-Saharan basin of Wadi Ferkla in southeastern Morocco receives low and erratic rainfall (annual average of 141 mm and inter-annual standard deviation of 70 mm). From the 1980s, surface water and groundwater are increasingly used due to the expansion of irrigation, mainly along two wadis, namely Wadis Ferkla and Satt originating in the High-Atlas and the Anti-Atlas Mountains, respectively. Their flows reach the Ferkla's irrigated perimeters only when the volume of the flood events exceed upstream evaporation, withdrawals and riverbed's infiltration. Nowadays, these irrigated perimeters exert significant pressure on groundwater resources, through numerous drillings equipped with pumping systems, most of them being powered by solar energy. This increasing water demand situation incentivizes individual farmers to design and implement innovative techniques to increase water access for their farms. For instance, the spreading of floodwaters – an ancestral and collective irrigation practice in traditional oases – is currently being modernized by individual farmers. The new technique consists in partially diverting flood flows into earthen basins. The stored water either infiltrates to recharge local aquifers, or is pumped for flood irrigation of date palms. An experimental protocol was set up to characterize groundwater recharge below one of these on-farm basins equipped with a recharge well. Barometric probes were installed in the basin, in the recharge well and in neighboring boreholes to automatically monitor water levels. A topographic survey of the monitoring points and of the basin aimed at deriving piezometric levels from water levels measurements and estimating the height-surface-volume curves of the basin. After 7 months of continuous monitoring, 3 flood events were recorded. The establishment of the basin water balance at a fine time-resolution allowed estimating its different components including the infiltration rate influencing groundwater recharge. An analytical modeling of this process was developed to assess its effect on groundwater level variations. This approach aims to contribute to a broader reflection on securing water management in this fragile oasis ecosystem.

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Section: Analytical Modelling Of Groundwater Rechargementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Managed groundwater recharge at the farm scale in pre-Saharan Morocco

Khardi,

Lacombe,

Dewandel

et al. 2024

Proc. IAHS

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“…2c), the hydraulic-head solution is the integral of Eq. 3 according to 2xL and 2yL (Zlotnik et al 2017, Dewandel et al 2021.…”

Section: Hydraulic-head Solution For An Underground Dam a Pumping Or ...mentioning

confidence: 99%

Soluciones semianalíticas en estado estacionario para evaluar la distribución bidimensional de la carga hidráulica inducida por una presa soterrada en un acuífero inclinado con recarga artificial del acuífero y bombeo

Dewandel,

Lanini,

Frissant

2023

Hydrogeol J

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Underground dams are a technology for artificially increasing existing groundwater resources. They modify the natural groundwater flow in aquifers and, typically, cause hydraulic heads to rise upstream and fall downstream of the dam. However, such modifications must be defined to forecast their environmental, economic and/or social impacts. A steady-state semi-analytical solution is proposed for evaluating the 2-D distribution of hydraulic head caused by an underground dam fully penetrating a homogeneous and inclined aquifer. The dam is impermeable, of rectangular shape and its length concerns a limited part of the aquifer width. The developed solution is based on the method of fundamental solutions. The analysis of the semi-analytical solution included sensitivity tests and a satisfactory comparison with numerical modelling. Dimensionless graphs relating the dam geometry to maximum hydraulic-head variations up-and downstream of the dam are given. The proposed solution was applied on two field sites giving very satisfactory results. A semi-analytical solution is also developed for an artificial recharge area and/or a pumping well near the underground dam. Interestingly, in the case of highly permeable aquifers, the increase in hydraulic head created by the dam may be much higher than that created by managed aquifer recharge (MAR), despite high injected flux. These semi-analytical solutions will be useful applications for assessing the long-term spatial distribution of hydraulic head induced by underground dams, or for testing the combination of dams with pumping wells or MAR technology. They are intended to guide the design of such structures, especially to quickly test various configurations.

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Conjunctive use of floodwater harvesting for managed aquifer recharge and irrigation on a date farm in Morocco

Khardi,

Lacombe,

Dewandel

et al. 2024

Irrigation and Drainage

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In arid regions, harvesting floodwater can mitigate irrigation‐induced groundwater depletion by providing additional surface water and recharging aquifers. We designed an experimental protocol to quantify these fluxes on a date farm located along the Wadi Satt, whose flow originates from the Anti‐Atlas Mountains in south‐eastern Morocco. Automatic barometric sensors were used to monitor the water level in a 6500 m3 floodwater harvesting pond and in surrounding boreholes. Six flood events occurred from 2021 to 2023. The pond water balance indicated that most stored water is pumped for irrigation (56% of harvested floodwater). More than 40% infiltrates at a rate of approximately 90 mm day−1, and the remainder evaporated. Analytical modelling of the pond water table system showed that the radius of the piezometric mound resulting from pond infiltration is less than 360 m. Groundwater recharge from the irrigated plot could be observed after two close floods that enabled continuous pumping for several weeks, suggesting that in this specific context, over‐irrigation using surface water allows the aquifer to be recharged. The hydrological effects of possible future expansion of these ponds at the watershed scale should be analysed to assess possible negative impacts on downstream water resources.

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Artificial aquifer recharge and pumping: transient analytical solutions for hydraulic head and impact on streamflow rate based on the spatial superposition method

Cited by 5 publications

References 48 publications

Managed groundwater recharge at the farm scale in pre-Saharan Morocco

Managed groundwater recharge at the farm scale in pre-Saharan Morocco

Soluciones semianalíticas en estado estacionario para evaluar la distribución bidimensional de la carga hidráulica inducida por una presa soterrada en un acuífero inclinado con recarga artificial del acuífero y bombeo

Conjunctive use of floodwater harvesting for managed aquifer recharge and irrigation on a date farm in Morocco

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