The Integration of Hydrological and Heat Exchange Processes Improves Stream Temperature Simulations in an Ecohydrological Model

Hydrological Processes, Journal Year: 2025, Volume and Issue: 39(4)

Published: April 1, 2025

ABSTRACT Stream temperature is among the main drivers affecting water quality by influencing chemical reaction rates and biological activity. Due to globally rising air temperatures, increased stream temperatures are equally becoming more relevant for ecosystem health. influenced a complex interplay of climate, hydrological processes catchment characteristics. However, these process interactions often overlooked when being integrated with models. This study addresses limitations simplified model using ecohydrological Soil Water Assessment Tool (SWAT+). Our goal was enhance representation in current refining mass transfer processes. We included heat improved channel shape parameter, influence riparian shading an equation simplify modified dew point calculation. The enhanced SWAT+ tested at 23 stations medium‐sized mountainous high‐resolution observed data. results show that significantly performance, achieving mean Kling–Gupta Efficiency (KGE) 0.8 across all calibration sites. previous advances modelling within this work focussing on importance accurate representation. A key finding impact runoff component contributions performance. performed particularly well during spring, autumn very low moderate flows. therefore not only serves as valuable tool management decisions ecological applications but also benefits other variables.

Language: Английский

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High-Temporal-Resolution Modeling of Land Surface Temperature and Groundwater Level Impacts on Shallow Aquifer Thermal Regimes

Water, Journal Year: 2025, Volume and Issue: 17(7), P. 1107 - 1107

Published: April 7, 2025

Climate change is recognized to directly and indirectly affect groundwater systems. However, the mechanisms through which climate influences temperature (GWT), particularly how seasonal variations mediate these effects, remain incompletely understood. This study utilized high-temporal-resolution (hourly) data by parameterizing levels (GWLs) instantaneous gradients model GWT, establishing Seasonally Adaptive Thermal Diffusivity Numerical Model (SATDNM). Through scenario analyses, potential impacts of on GWT were simulated. The results indicate that our captures interannual more precisely compared classical models, revealing influence GWLs subsurface thermal properties such as advents wet-season rainfall, well long-term surface warming GWL decline. key findings include (1) a greater sensitivity extreme heat during winter, (2) rainfall potentially stabilizing temperature, (3) declining amplifying fluctuations. By 2100, projected mean increases under four Shared Socioeconomic Pathway (SSP) scenarios are approximately 0.51 °C (SSP1-2.6), 1.25 (SSP2-4.5), 2.19 (SSP3-7.0), 2.87 (SSP5-8.5). Under annual decline rates, fluctuations increased 0.094 (0.01 m/year), 0.27 (0.02 0.44 (0.03 0.67 (0.04 respectively. These enhance mechanistic understanding climate–groundwater interactions provide new insights for adaptive management change.

Language: Английский

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Feasibility Experiment and Simulation on Controlling the “Pot Cover Effect” of Subgrade in Seasonally Frozen Regions by Capillary Barrier Layer

International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2025, Volume and Issue: unknown

Published: April 20, 2025

ABSTRACT The pot cover effect can increase the moisture content in shallow soil, which reduces subgrade strength and may lead to engineering issues, such as pavement cracks deformation. Therefore, studying prevention measures for is essential. This paper proposes preventive measures, inspired by capillary barrier layers used landfills, that involve installing mitigate effect. First, a self‐designed test device was compare hydrothermal changes conventional fill with gravel sand layer seasonal frozen soil environment. Second, water–vapor–heat coupling model developed simulate quantitative water migration induced during experiment. Finally, long‐term of using on loess northwest China simulated. results show at depth 2.5 cm, liquid without increases number freeze–thaw cycles, reaching maximum 5.9%. In contrast, same only 0.9%; vapor flux 1/10 layer. proposed method offers theoretical insights mitigating guiding future designs.

Language: Английский

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Is urban heat island negatively correlated with green vegetation density and affects groundwater potential? A study in Depok, Sleman, Yogyakarta

IOP Conference Series Earth and Environmental Science, Journal Year: 2025, Volume and Issue: 1490(1), P. 012049 - 012049

Published: April 1, 2025

Abstract Urban Heat Island (UHI) is a major problem in urbanization, which related to land use, green space density, population and thought affect groundwater potential. This study analyzed the urban heat vegetation research was conducted sub-district of Condongcatur, Caturtunggal Maguwoharjo Depok, Sleman, Yogyakarta using Remote Sensing (RS) with Landsat-8 Satellite Images also accompanied by field measurements. According results, Depok UHI zone temperature 30.85°C - 36.93°C. The (33.3° C) then (33.14° Condongcatur (32.69° C). Correlation-Regression density (NDVI) for coverage has correlation value 0.608 (r 2 = 37.05%) Sleman 0.53 28.08 %). Groundwater Potential 0.585 34.29%) 0.465 21.62%). It concluded that Kapanewon Yogyakarta, moderate negatively correlated but positively Potential. Land use increases potential strength.

Language: Английский

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Diel temperature signals track seasonal shifts in localized groundwater contributions to headwater streamflow generation at network scale

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 639, P. 131528 - 131528

Published: June 16, 2024

Groundwater contributions to streamflow sustain aquatic ecosystem resilience; streams without significant groundwater inputs often have well-coupled air and water temperatures that degrade cold-water habitat during warm low flow periods. Widespread uncertainty in stream-groundwater connectivity across space time has created disparate predictions of energy nutrient fluxes headwater networks, hindering resilience under climate change scenarios. Recently, annual paired temperature signals been harnessed indicate stream thermal sensitivity the dominance deep versus shallow influence, although utility diel air–water signal metrics for hydrologic inference remained unexplored. Here we analyzed two consecutive years locally paired, data from 47 sites Catskill Mountains, New York, USA, discovered characteristic seasonal patterns sinusoid (amplitude ratio, phase lag, mean ratio) driven by shifts generation mechanisms network position. Hydrologic interpretations observed were supported heat budget model scenarios additional analysis Shenandoah National Park, Virginia, with well characterized connectivity. We found within smaller tributaries, transitions runoff hillslope drying periods lower precipitation. This was evidenced correlations (p < 0.01) between daily water:air amplitudes (non-linear decreases ∼ 50 %) derived base-flow index at 22 28 sites, indicating enhanced local influence on promotes decoupling signals. Additionally, ratios means tributaries (∼0.68) when compared main-stem (∼0.8) increasing linearly throughout observational period. In conceptual models, inflow had minimal effects lags (∼0.2 hr), but increases fractional discharge (0–50 depressed amplitude (∼20 % (∼15 %), supporting interpreted changes streamflow. During (i.e., April through October 2021 2022), differences tributary occurred highest (∼0.93 vs. 0.68), as dominated channel inertia, rather than connectivity, showing coupling warmer, drier Divergent being distance source zones, lateral inflows do not contribute a meaningful fraction network. Given growing footprint observations, can provide distributed sensitive upstream discharge. Consequently, these support ongoing efforts resource managers researchers seeking forecast warming changing precipitation regimes mountain streams.

Language: Английский

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Leaf litter breakdown phenology in headwater stream networks is modulated by groundwater thermal regimes and litter type

Limnology and Oceanography Letters, Journal Year: 2024, Volume and Issue: 9(5), P. 532 - 542

Published: July 4, 2024

Abstract Leaf litter dominates particulate organic carbon inputs to forest streams. Using data‐informed simulations, we explored how type (slow‐ vs. fast‐decomposing species), pulsed autumn inputs, groundwater‐mediated temperature regimes, and climate warming affect breakdown in a 3 rd ‐order stream network. We found that the time‐dependent interactions of these variables govern network‐scale phenology, with greater thermal sensitivity slow‐decomposing for both current future scenarios. Groundwater modified phenology by reducing spring summer elevating winter fluxes. Under scenarios, source depth contributing groundwater influenced detrital resources; shallow groundwater‐fed streams had reduced resources compared deep Our results demonstrate predicting in‐stream cycling requires explicit consideration resource seasonal timing environmental factors, notably regimes.

Language: Английский

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Open questions about the effects of ground warming on infrastructure

Nature Cities, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 25, 2024

Language: Английский

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Groundwater resilience, security, and safety in the four largest cities in Denmark

Acque Sotterranee-Italian Journal of Groundwater, Journal Year: 2024, Volume and Issue: 13(3)

Published: Sept. 30, 2024

Denmark's complete reliance on groundwater for water supply presents a unique case study in management of natural resources, urban planning, and resilience the face climate change. This paper examines strategies Denmark general, focusing four largest cities—Copenhagen, Aarhus, Odense, Aalborg— each facing distinct challenges due to their demographic, geographical, hydrogeological, economic characteristics. Through analysis these cities' approaches management, this research contributes global discourse sustainable systems. As coastal cities (CGC), areas must navigate complexities sustaining growing populations, mitigating change impacts, processes while ensuring long-term viability resources. Copenhagen Aalborg, built atop semi-confined fractured locally karstic carbonate rocks, highlights specific associated with systems, while, Odense glaciofluvial aquifers faces different issues. The underscores importance integrating development resource environmental sustainability, offering valuable insights lessons learned other regions similar challenges. study, thus not only sheds light practices, but also emphasizes need innovative solutions ensure systems changing increasing pressures emerging organic contaminants elevated concentrations geogenic elements induced by abstraction fluctuating tables. Advanced Danish monitoring modelling tools applied support decision-making innovation within sector are continuously developed improved resilient available

Language: Английский

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Environmental impact of an anthropogenic groundwater temperature hotspot

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 955, P. 177153 - 177153

Published: Oct. 21, 2024

Heat emitted by buildings and other infrastructure accumulates in the subsurface. This additional heat can cause a pronounced shift thermal boundary conditions of important groundwater ecosystem. Shallow systems Central Europe are often inhabited communities fauna adapted to cold stable as well microorganisms, whose activity is dependent on ambient temperatures. At local temperature hotspot up 23 °C, caused water park, we assessed environmental impact this alteration shallow system. The results show that overall quality at site influenced anthropogenic land use, compared wells nearby protection zone. However, neither hydrochemical nor ecological characteristics from vicinity park indicate any significant dependence temperature. Hence, conclude eutrophic anoxic aquifer moderate stress does not lead alterations terms hydrochemistry microbiological properties. Due low oxygen concentrations (<1 mg/l), stygofauna present only occasionally cannot be used bioindicators. These have verified for types would benefit more in-depth analysis microbial community composition.

Language: Английский

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Pumping Groundwater to Create Cold‐Water Thermal Refuges in Warming Rivers

Ecohydrology, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 14, 2024

ABSTRACT Thermal refuges in rivers and streams provide critical habitat for cold‐water species during periods of thermal stress. In this study, we created a new refuge by pumping cool groundwater to warm coastal river Nova Scotia, Canada. infrared imagery revealed notable plume, measuring approximately 55 m 2 at the water surface low‐flow conditions, with mixing limited installation flow deflector. Above‐water underwater cameras recorded several fish utilizing plume high ambient temperatures (up 30°C). numerical modelling was conducted interpret field data assess impact alternative designs conditions. Model results that extent substantially increased (+202%) use deflector size controlled factors including rate temperature, temperature. The study findings demonstrate efficacy creating face warming climate lay foundation future proactive management strategies aimed maintaining diversity rivers.

Language: Английский

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