Groundwater recharge assessment in a rural, arid, mid-mountain basin in North-Central Chile

Sandoval, Eric; Baldo, Giacomo; Núñez, Javier; Oyarzún, Jorge; Fairley, Jerry P.; Ajami, Hoori; Arumí, José Luis; Aguirre, Evelyn; Maturana, Hugo; Oyarzún, Roberto

doi:10.1080/02626667.2018.1545095

Cited by 12 publications

(7 citation statements)

References 26 publications

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“…Two studies in Marshall Gulch, AZ, obtained very small estimates (1-2% of precipitation) for bedrock groundwater recharge in this headwater catchment based on a storage-discharge function (Ajami et al, 2011) and baseflow recession analysis (Dwivedi et al, 2019), though neither studies had access to bedrock wells for their analysis. Sandoval et al (2018) applied a similar approach as Ajami et al (2011) and estimated bedrock recharge to be 1-4% of precipitation in the Punitaqui Basin of northern Chile. The low bedrock recharge estimates in these three studies indicate small absolute interbasin flow rates and are not surprising for these arid mountain regions.…”

Section: Mountain-focused Studiesmentioning

confidence: 99%

Mountain‐Block Recharge: A Review of Current Understanding

Markovich

Manning

Condon

et al. 2019

Water Resources Research

113

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Mountain‐block recharge (MBR) is the subsurface inflow of groundwater to lowland aquifers from adjacent mountains. MBR can be a major component of recharge but remains difficult to characterize and quantify due to limited hydrogeologic, climatic, and other data in the mountain block and at the mountain front. The number of MBR‐related studies has increased dramatically in the 15 years since the last review of the topic was conducted by Wilson and Guan (2004), generating important advancements. We review this recent body of literature, summarize current understanding of factors controlling MBR, and provide recommendations for future research priorities. Prior to 2004, most MBR studies were performed in the southwestern United States. Since then, numerous studies have detected and quantified MBR in basins around the world, typically estimating MBR to be 5–50% of basin‐fill aquifer recharge. Theoretical studies using generic numerical modeling domains have revealed fundamental hydrogeologic and topographic controls on the amount of MBR and where it originates within the mountain block. Several mountain‐focused hydrogeologic studies have confirmed the widespread existence of mountain bedrock aquifers hosting considerable groundwater flow and, in some cases, identified the occurrence of interbasin flow leaving headwater catchments in the subsurface—both of which are required for MBR to occur. Future MBR research should focus on the collection of high‐priority data (e.g., subsurface data near the mountain front and within the mountain block) and the development of sophisticated coupled models calibrated to multiple data types to best constrain MBR and predict how it may change in response to climate warming.

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Section: Mountain-focused Studiesmentioning

confidence: 99%

Mountain‐Block Recharge: A Review of Current Understanding

Markovich

Manning

Condon

et al. 2019

Water Resources Research

113

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“…The shallow groundwater movement is likely a local‐to‐intermediate scale process of small flow rates as it has been observed in arid Andean mountain regions of north‐central Chile (Sandoval et al, 2018). To what extent this bedrock leaking feeds downstream baseflows and volcanic aquifers is inconclusive from this study.…”

Section: Discussionmentioning

confidence: 81%

Unravelling runoff processes in Andean basins in northern Ecuador through hydrological signatures

Gordillo

Pineda

2021

Hydrological Processes

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Streamflow is the runoff response integrated in space and time over a complex system involving climatic and catchment physiographic factors. In the Andes, accelerating runoff process understanding is hampered by the inability to quantify heterogeneity of surface and subsurface catchment properties. Here, we present a statistical approach based on regression models and correlation analysis that links hydrological signatures and catchment properties to unveil processes in a set of volcanic mountain catchments (latitude 0 30'N) in Ecuador. The catchments represent form and function diversity in the same hydrological unit. We found that despite of similar atmospheric-water inputs the water yield in the north-east region is about 5Â larger than in the south-west region and their flow regimes are asymmetric. The soilbedrock interface and lithology exert a first-order control on hydrologic partitioning, and this allowed us to hypothesize two hydrological mechanisms. Firstly, in the north-east region, the perennial streamflow is associated with seasonal rainfall patterns, and subsequent drainage processes taking place at the surface and subsurface level. The amount of streamflow is related to landform characteristics, high canopy density and root development of forest as well as water holding capacity of organic soils. From a mechanistic standpoint, the low concentration time, steep slopes and shallow infiltration limited by high-consolidated deposits of sedimentary and volcanics suggest a lateral movement of the flow. Secondly, in the south-west region the streamflow regime is mostly groundwater-dependent and it becomes seasonally enhanced by rainfall. Larger seasonal variations of precipitation and temperature result into enhanced evapotranspiration in the drier months, limiting shallow soil infiltration. Under the soil layers, highly permeable pyroclastic deposits and andesitic lavas promote deep percolation. The results highlight the degree of dissimilarity of hydrological processes in Andean settings, but unravelling their complexity seems plausible using streamflow signatures and causal explanatory models.

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“…In the case of T2-RCP4.5, climate variables account for only 23.11% of groundwater recharge flux, whereas 76.89% of the variation in recharge flux could be explained by other influential factors (fate and transport of solute, drainage practice, and soil texture along with soil organic matter). Recharge flux is controlled by 1-4% of annual average rainfall (Sandoval et al 2018). Likewise, the regression analysis point to R 2 (coefficient of determination) of 0.2109, implying that the impact of climate variables explains 21.09% of the recharge flux changes in T4-RCP8.5, while 78.91% controlled by other factors such as flood and drought.…”

Section: Impact Of Climate Change On Groundwater Rechargementioning

confidence: 81%

Impact of Climate Change on Groundwater Recharge in Cotton Irrigated Fields under Agronomical Practices

Saeed¹,

Maqbool²,

Ashraf³

et al. 2021

Preprint

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Cotton crop is one of the major water consumers in the Indus basin region. Accurate groundwater recharge estimation is a provoking duty due to hydrologic and environmental applications under climate change in the agricultural sector. An utmost region that is vulnerable to climate change and cotton production is declining, consequently. Here, historical trends (1975–2005) and future variability (2021-50 and 2051-80) of climate parameters were analyzed and predicted by SDSM for three emission scenarios (RCP 2.6, RCP 4.5, and RCP 8.5) for the semi-arid region Faisalabad, Pakistan. Results revealed a rise in maximum (minimum) temperature and a decline in rainfall, relative humidity, and wind speed for both 2021-50 and 2051-80 using different NCEP parameters (p < 0.05). The groundwater recharge was simulated using the Hydrus-1D unsaturated flow model. Hydrus-1D unsaturated flow model simulated the groundwater recharge under six treatments. A 41 cm reduction of groundwater recharge was observed under all scenarios. The highest recharge was observed 71 cm under RCP 2.6, and the lowest recharge was 30 cm under RCP 8.5, a maximum of 23% groundwater recharge controlled by climate variables with the weak relationship among them. Cotton sowing method T6(bed planting without mulch) showed the highest yield (1,066 kg.ha− 1). It further indicates that rather than climate change, the agronomical practice may have a more significant impact on groundwater recharge and cotton yield. Findings highlight the significance of both climate change and the cotton sowing method while accessing future water resources in irrigated Indus basin agriculture.

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Groundwater recharge assessment in a rural, arid, mid-mountain basin in North-Central Chile

Cited by 12 publications

References 26 publications

Mountain‐Block Recharge: A Review of Current Understanding

Mountain‐Block Recharge: A Review of Current Understanding

Unravelling runoff processes in Andean basins in northern Ecuador through hydrological signatures

Impact of Climate Change on Groundwater Recharge in Cotton Irrigated Fields under Agronomical Practices

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