The Role of Bedrock Circulation Depth and Porosity in Mountain Streamflow Response to Prolonged Drought

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(4)

Published: Feb. 22, 2025

Abstract Quantitative understanding is lacking on how the depth of active groundwater circulation in bedrock affects mountain streamflow response to a multi‐year drought. We use an integrated hydrological model explore sensitivity variety metrics and porosity under plausible extreme drought scenario lasting up 5 years. Endmember versus hydraulic conductivity relationships values for fractured crystalline rock are simulated. With drought, deeper system with higher drainable more effectively buffers minimum flow significantly limits perennial stream loss comparison shallow system. Streamflow buffering accomplished through extensive storage loss. However, systems experience prolonged recovery from storage‐limited systems. Research highlights importance characterizing hydrogeology mountainous watersheds better understand predict impacts ecosystem health water resource sustainability.

Language: Английский

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Rehabilitating Valley Floors to a Stage 0 Condition: A Synthesis of Opening Outcomes

Frontiers in Environmental Science, Journal Year: 2022, Volume and Issue: 10

Published: July 15, 2022

Degraded floodplains and valley floors are restored with the goal of enhancing habitat for native fish aquatic-riparian biota protection or improvement water quality. Recent years have seen a shift toward “process-based restoration” that is intended to reestablish compromised ecogeomorphic processes resulting from site- watershed-scale degradation. One form process-based restoration has developed in Pacific Northwest, United States, reconnect rivers their by slowing down flows sediment, water, nutrients encourage lateral vertical connectivity at base flows, facilitating development dynamic, self-forming, self-sustaining river-wetland corridors. Synergies between applied practices theoretical work Cluer Thorne 2014 led this be referred regionally as Stage 0 condition. This approach rehabilitation scale, rendering traditional monitoring strategies target single-thread channels inadequate capture pre- post-project site conditions, thus motivating novel approaches. We present specific definition new type was collaborative workshops practitioners approach. Further, we an initial synthesis results activities provide foundation understanding effects river on substrate composition, depth groundwater, temperature, macroinvertebrate richness abundance, secondary production, vegetation wood loading configuration, inundation, flow velocity, modeled juvenile salmonid habitat, aquatic biodiversity.

Language: Английский

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Climate Change Yields Groundwater Warming in Bavaria, Germany

Frontiers in Earth Science, Journal Year: 2020, Volume and Issue: 8

Published: Nov. 13, 2020

Thermodynamic coupling between atmosphere and ground yields increasing aquifer temperatures as a consequence of global warming. While this is expected to manifest gradual warming in groundwater temperature time series, such continuous long-term recordings are scarce. As an alternative, the present work examines use repeated temperature-depth profiles 35 wells southern Germany, that were logged during campaigns early 1990s 2019. It revealed have increased nearly all cases. We find moderate good depth-dependent correlation trends air temperature, which however strongly influenced by local hydrogeological climate conditions. last three decades, rate 0.35 K (10a)-1 on average, increase subsurface decreasing with depth, median values 0.28 20 m only 0.09 60 depth. Still, slow damped bodies remarkable, especially considering naturally very minor changes pristine predictions atmospheric temperatures. This entails implications for temperature-dependent ecological hydro-chemical processes, also heat stored shallow ground. Moreover, it demonstrated annual gain below 15 due change range 10% state’s total demand, underlines geothermal potential associated natural fluxes at surface.

Language: Английский

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Identifying surface water and groundwater interactions using multiple experimental methods in the riparian zone of the polluted and disturbed Shaying River, China

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 875, P. 162616 - 162616

Published: March 8, 2023

Language: Английский

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Drought impacts on river water temperature: A process‐based understanding from temperate climates

Hydrological Processes, Journal Year: 2023, Volume and Issue: 37(10)

Published: Oct. 1, 2023

Abstract High river water temperature ( T w ) extremes have been widely reported during drought conditions as extreme low‐flows often coincide with high atmospheric energy inputs. This has significant implications for freshwater ecosystem health and sustainable management practices globally. However, the extent to which different meteorological hydrological processes interact droughts govern dynamics, how this varies between environmental contexts, remains poorly understood. Here, we review mechanisms controlling dynamics across temperate, maritime environments, using United Kingdom a detailed case study. We evidence that spikes occurred low‐flow events observed within droughts, but such trends inconsistent due varying hydroclimatic basin controls. To better understand this, re‐conceptualize governing drought‐induced operating three ‘process sets’: (i) ‘energy flux dynamics’ non‐advective controls on ; (ii) role of ‘reach‐scale habitat conditions’ in mediating , including hydraulic properties (e.g., residence time) physical riparian vegetation coverages, wetted perimeters); (iii) ‘water source contributions’ (surface groundwater) advective heat flow natural anthropogenic influences affecting each process set discuss are likely change under conditions. More systematic research (spanning various environments severities) is required test concepts, existing scientific knowledge being largely gleaned from studies examining non‐extreme or broader focuses annual thermal dynamics). conclude by highlighting critical future questions need be answered model unmonitored sites. Such advances would more effectively inform could managed through evidence‐based mitigation adaptation strategies.

Language: Английский

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Comparison of three types of fiber optic sensors for temperature monitoring in a groundwater flow simulator

Sensors and Actuators A Physical, Journal Year: 2021, Volume and Issue: 331, P. 112682 - 112682

Published: March 18, 2021

Different fiber optic sensors have been used for groundwater temperature monitoring and the question is which one to choose a particular study. In field conditions it sometimes difficult determine how much error introduced by sensor placement technique, packaging or cross-sensitivity between strain. These factors were studied in laboratory simulator during heat tracing experiment. The performance of three technologies was evaluated – distributed sensing, Bragg gratings continuous gratings. All had comparable accuracy around 0.2 °C resolution smaller than 0.1 °C. Therefore, need be considered when choosing are spatial resolution, sampling frequency possibility measure absolute/relative temperature. experiment also showed that strain effects can even fibers loose tube packaging.

Language: Английский

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Present and future thermal regimes of intertidal groundwater springs in a threatened coastal ecosystem

Hydrology and earth system sciences, Journal Year: 2022, Volume and Issue: 26(18), P. 4721 - 4740

Published: Sept. 28, 2022

Abstract. In inland settings, groundwater discharge thermally modulates receiving surface water bodies and provides localized thermal refuges; however, the influence of intertidal springs on coastal waters their sensitivity to climate change are not well studied. We addressed this knowledge gap with a field- model-based study threatened lagoon ecosystem in southeastern Canada. paired analyses drone-based imagery situ hydrologic monitoring estimate from groundwater-dominated streams summer 2020. Results, which were generally supported by independent radon-based estimates, revealed that combined summertime spring inflows (0.047 m3 s−1) comparable stream (0.050 s−1). Net advection values for also each other but 2 orders magnitude less than downwelling shortwave radiation across lagoon. Although lagoon-scale effects small compared atmospheric forcing, dominated heat transfer at local scale, creating pronounced cold-water plumes along shoreline. A numerical model was used interpret measured temperature data investigate seasonal multi-decadal patterns. Modelled temperatures relate respective aquifer source depths, while simulations forced historic projected assess long-term warming. Based 2020–2100 scenarios (for 5-year-averaged air increased up 4.32∘), modelled subsurface 0.08–2.23∘ shallow (4.2 m depth) 0.32–1.42∘ deeper portion (13.9 m), indicating depth dependency This presents first analysis groundwater-dependent ecosystems indicates management should consider potential impacts

Language: Английский

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Spatiotemporal variation in size-dependent growth rates in small isolated populations of Arctic charr ( Salvelinus alpinus )

Royal Society Open Science, Journal Year: 2025, Volume and Issue: 12(1)

Published: Jan. 1, 2025

As a key life-history trait, growth rates are often used to measure individual performance and inform parameters in demographic models. Furthermore, intraspecific trait variation generates diversity nature. Therefore, partitioning out understanding drivers of spatiotemporal rate is fundamental interest ecology evolution. However, this has rarely been attempted owing the amount individual-level data required through both time space, issues with missing important covariates. Here, we implemented Bayesian state-space model using from 20 populations Arctic charr (Salvelinus alpinus) across 15 capture occasions, which allowed us to: (i) integrate over uncertainty recapture records; (ii) robustly estimate size-dependence; (iii) include covariate (water temperature) that contained data. Interestingly, although there was substantial spatial, temporal rate, only weakly associated water temperature almost entirely independent size, suggesting other environmental conditions affected individuals sizes similarly. This fine-scale emphasizes importance local highlights potential for size-dependent even when apparently very similar.

Language: Английский

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Spring discharge and thermal regime of a groundwater dependent ecosystem in an arid karst environment

Journal of Hydrology, Journal Year: 2020, Volume and Issue: 587, P. 124947 - 124947

Published: April 20, 2020

Language: Английский

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Stabilising effects of karstic groundwater on stream fish communities

Ecology Of Freshwater Fish, Journal Year: 2023, Volume and Issue: 32(3), P. 538 - 551

Published: Feb. 7, 2023

Abstract Although groundwater exchange processes are known to modulate atmospheric influences on stream temperature and flow, the implications for ecological stability poorly understood. Here, we evaluated temporal change in fish communities across a gradient of influence defined by karst terrain (carbonate parent materials) within Potomac River basin eastern North America. We surveyed 12 sites 2022 that had been sampled 29–30 years previously with similar methods. also collected data from each site used regression slope air‐water relationship index thermal sensitivity processes. Sites exhibited strong controls temperature, were more stable over time these locations than elsewhere. However, was stronger predictor species persistence spatial distribution contributing areas, highlighting importance local variation discharge The presence calcium precipitates (marl) substrates associated low time, suggest such visible features may be useful indicator climate refugia ecosystems.

Language: Английский

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