Effects of montane watershed development on vulnerability of domestic groundwater supply during drought

Levy, Zeno F.; Fram, Miranda S.; Faulkner, Kirsten E.; Alpers, Charles N.; Soltero, E.; Taylor, Kimberly A.

doi:10.1016/j.jhydrol.2020.124567

Cited by 7 publications

(4 citation statements)

References 59 publications

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“…Our finding that δ 18 O is not sensitive to river proximity further indicates that recharge after diversion and irrigation does not significantly change the δ 18 O signature in the SJV when compared to direct recharge of river water. In contrast, diverted surface water in the Sierra Nevada foothills north of the SJV was found to recharge groundwater with a significant shift in δ 18 O due to evaporative fractionation …”

Section: Resultsmentioning

confidence: 99%

“…In contrast, diverted surface water in the Sierra Nevada foothills north of the SJV was found to recharge groundwater with a significant shift in δ 18 O due to evaporative fractionation. 76 To study the effect of the recharge mechanism (direct river recharge or irrigation with river water), we examined the relationship between the distance to the river and nitrate concentrations in the subset of wells with a predominance of river water signature (δ 18 O < −10.5‰) and a river water recharge temperature (NGRT < 17.5 °C). We assume that wells closer to rivers are more likely to be affected by direct river recharge, while those further away are affected primarily by surface water irrigation.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Effect of Groundwater Age and Recharge Source on Nitrate Concentrations in Domestic Wells in the San Joaquin Valley

Castaldo

Visser

Fogg

et al. 2021

Environ. Sci. Technol.

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Nitrate is one of the most abundant contaminants in groundwater globally, in the United States, and in California (CA). We studied well construction information, water chemistry, stable isotopes, and noble gases to understand how groundwater travel time and recharge source and mechanism control nitrate concentrations in domestic wells in the San Joaquin Valley (SJV), CA, a large semiarid, irrigated agricultural region. Using nonparametric statistics, we find a decreasing trend in nitrates with groundwater travel time and well depth. Samples collected from wells that are closer to rivers and that show indications of river water recharge, either low recharge temperature or low δ 18 O signature, have lower concentrations of nitrates than samples with isotopic signatures indicating mixed source or local precipitation recharge. The curbing effect of river water recharge on nitrate concentrations in domestic wells is similar for direct river recharge and water applied as irrigation. This suggests that irrigation with river water also has a diluting effect that reduces the concentration of nitrate found in groundwater. This conclusion supports the idea that flood-managed aquifer recharge may be considered for remediation of groundwater nitrate when designing replenishment of aquifers.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Effect of Groundwater Age and Recharge Source on Nitrate Concentrations in Domestic Wells in the San Joaquin Valley

Castaldo

Visser

Fogg

et al. 2021

Environ. Sci. Technol.

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“…Chen, Luo, et al (2015) and Jin et al (2019) also found that soil structure was poorer and the depth of the GIZ was deeper in EF compared with SF (Ke, Liu, et al, 2021). Therefore, SWC can be maintained to an improved degree during periods of drought and groundwater can be supplied in a timely manner in SF (Booth et al, 2016; Levy et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Excavated farmland treated with plastic mulching as a strategy for groundwater conservation and the control of soil salinization

Liu²,

et al. 2022

Land Degrad Dev

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Soil salinization and water deficits in gully consolidation farmland including excavated farmland (EF) and sediment deposited farmland (SF) have become an increasing concern in the Loess Hilly region, China. However, the responses of different farmland types and tillage-mulching practices on soil salt content (SSC) and water use efficiency (WUE) have not been widely studied in this region. Thus, we conducted a two-year field experiment to assess the soil water content (SWC) and SSC and their effect on the spring maize yield and WUE under different tillage-mulching practices in EF and SF. Eight treatments incorporating flat cropping without mulching (FC), ridge planting without mulching (RP), ridge cropping with straw mulching (SM), and ridge cropping with plastic mulching (PM) were applied to EF and SF plots, respec-

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“…In California's Central Valley, the rate of groundwater depletion has been accelerating since 2003, a period of megadrought in southwestern North America (Liu et al., 2022). More broadly, California has experienced widespread groundwater level declines due to a multi‐year drought (Lund et al., 2018; Ojha et al., 2019), resulting in numerous wells needing to be deepened (Levy et al., 2020). Droughts can also have adverse impacts on ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Early Warning Indicators of Groundwater Drought in Mountainous Regions

Gullacher,

Allen,

Goetz

2023

Water Resources Research

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Aquifers in mountainous regions are susceptible to drought. However, the diverse hydroclimatology, the small and responsive aquifers, and the varied nature of interactions between groundwater and surface water lead to complex groundwater level responses that are challenging to interpret for understanding groundwater drought. In this study, generalized additive models (GAMs) are used to explore the sensitivity of summer groundwater levels to various climate and hydrological predictor variables (indicators) in each of a snowmelt‐ and rainfall‐dominated hydroclimatic regime in British Columbia, Canada. A sensitivity analysis explores individual seasonal predictor variables, station versus gridded climate data, teleconnection indices, and time series length. GAMs are then generated for different combinations of predictor variables to identify the best combination for each region. In the snowmelt‐dominated regime, maximum spring temperature, maximum snow water equivalent, and the winter Nino 3.4 index is the best combination of variables for predicting summer groundwater levels. In the rainfall‐dominated regime, maximum spring temperature, winter precipitation, and spring streamflow is the best combination. The unique combinations of predictor variables for each region can be used as early warning indicators for groundwater drought preparedness by water managers prior to the beginning of the summer. The Standardized Groundwater Level Index (SGI) is also effective at indicating which wells had pronounced responses to periods of drought in each region. However, the SGI differed among aquifers of similar type, suggesting other factors such as aquifer response mechanism and groundwater pumping may have an important influence on the SGI.

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Effects of montane watershed development on vulnerability of domestic groundwater supply during drought

Cited by 7 publications

References 59 publications

Effect of Groundwater Age and Recharge Source on Nitrate Concentrations in Domestic Wells in the San Joaquin Valley

Effect of Groundwater Age and Recharge Source on Nitrate Concentrations in Domestic Wells in the San Joaquin Valley

Excavated farmland treated with plastic mulching as a strategy for groundwater conservation and the control of soil salinization

Early Warning Indicators of Groundwater Drought in Mountainous Regions

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