Assessing impacts of alternative land use strategies on water partitioning, storage and ages in drought‐sensitive lowland catchments using tracer‐aided ecohydrological modelling

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(4)

Published: April 1, 2024

Abstract Continuing negative rainfall anomalies, coupled with climate change projections of increased drought severity and frequency, drive an urgent need to increase resilience integration in land water management strategies many regions the world. However, complex interactions between cover change, ecohydrological partitioning availability are difficult quantify, especially at different temporal spatial scales. In conjunction local stakeholders, we developed plausible, alternative use scenarios (including forest diversification agroforestry schemes) based on existing four primary types (i.e., conifer broadleaved forests, arable agriculture, pasture) a 66 km 2 drought‐sensitive catchment northern Germany. We used modelling evaluate changes flux partitioning, storage ages. The spatially‐distributed, tracer‐aided model, EcH O‐iso, calibrated using hydrometric, isotopic data daily time steps from 2007 2019 was this assessment. results showed that replacing forests uneven‐aged mixed younger broad‐leaved trees had greatest potential for reducing total evapotranspiration increasing groundwater recharge. For coniferous 50% proportion projected result 11% recharge across catchment. mixed‐forest alternatives also reduced turnover times, which would support more rapid recovery soil moisture stores following droughts. This study demonstrates such approach has contribute useful science‐based evidence policy makers allowing quantitative assessment effects effective communication stakeholders.

Language: Английский

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Upscaling Tracer‐Aided Ecohydrological Modeling to Larger Catchments: Implications for Process Representation and Heterogeneity in Landscape Organization

Water Resources Research, Journal Year: 2023, Volume and Issue: 59(3)

Published: Feb. 21, 2023

Abstract Stable isotopes of water are ideal tracers to integrate into process‐based models, advancing ecohydrological understanding. Current tracer‐aided modeling is mostly conducted in relatively small‐scale catchments, due limited tracer data availability and often highly damped stream isotope signals larger catchments (>100 km 2 ). Recent model developments have prioritized better spatial representation, offering new potential for upscaling modeling. Here, we adapted the fully distributed EcH O‐iso Selke catchment (456 , Germany), incorporating monthly sampled from seven sites between 2012 2017. Parameter sensitivity analysis indicated that information content was generally complementary discharge more sensitive runoff partitioning, soil energy dynamics. Multi‐criteria calibrations revealed inclusion could significantly improve performance during validations simulations, resulting reasonable estimates seasonality ages. However, capturing isotopic non‐linear near‐surface processes remained challenging upscaled model, but still allowed plausible simulation ages reflecting non‐stationarity transport mixing. The detailed also helped unravel spatio‐temporally varying patterns storage‐flux‐age interactions their interplay under severe drought conditions. Embracing challenges, this study demonstrated even coarsely can be value aiding consequent process representation catchments. derived innovative insights functioning at scales commensurate with management decision making, particular importance guiding science‐based measures tackling environmental changes.

Language: Английский

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Developing a conceptual model of groundwater – Surface water interactions in a drought sensitive lowland catchment using multi-proxy data

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 628, P. 130550 - 130550

Published: Dec. 7, 2023

Language: Английский

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Assessing the impact of drought on water cycling in urban trees via in-situ isotopic monitoring of plant xylem water

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 633, P. 131020 - 131020

Published: March 6, 2024

Urban trees are an integral part of sustainable cities. They regulate the local microclimate and enhance urban water cycle. Increasing periods drought can impair by affecting their uptake, transpiration growth patterns. In this study, we used a multi-proxy approach to assess how non-irrigated react changing supply throughout full vegetative period 2022 including major in Berlin, Germany. Our work focused on individual mature green space; examining daily mean in-situ isotopes plant xylem (δxyl) while also monitoring vegetation dynamics via sap flow, stem increments, LAI, as well groundwater, soil moisture at different depths. The was characterised spring with average precipitation inputs, followed extremely dry from July until mid-August, then gradual rewetting end August October. At beginning growing period, changes ecohydrological investigated maple birch were high increases size but decreasing moisture. spring, δxyl signatures both trees, effect more marked hinting dependence species specific-storage effects distinct start transpiration. During summer, stress apparent fluxes monitored reduction growth, midday potential Yet flow rates relatively stable tree maintained. We noted midsummer enrichment species. Most importantly, measured isotopically range deep waters groundwater implying that deeper sources sustaining trees' during drought. detected fractionation δxyl, which is possibly induced heterogenous uptake strategies biochemical processes xylem, CH4 transport. results suggest rely internal storage conclude shrubs shallow root development would be vulnerable summers particular threat future accelerated summer droughts combined insufficient autumn causing layers out.

Language: Английский

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Long-term drought effects on landscape water storage and recovery under contrasting landuses

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 636, P. 131339 - 131339

Published: May 13, 2024

Recent extreme droughts in Europe have highlighted the urgent need to quantify their effects on ecohydrological fluxes (evapotranspiration, groundwater recharge) and water storage (mainly soil moisture) landscape. In response, we combined process-based (EcH2O-iso) machine learning (NARX) models estimate enduring of long-term drought project future short-term levels recovery potential under various precipitation scenarios. The work was undertaken at Demnitz Mill Creek (DMC), a 70 km2 mixed land use (arable crops forestry) catchment northern Germany. Our simulations indicated that years 2018 2022 had most marked impacts, leading substantial declines recharge (>40 %), evapotranspiration (up 16 %) moisture 6 %). Simulations may not recover next 15 if recent anomalies persist. These findings underscore requirement for enhancing resilience promoting integrated strategies managing resources optimise retention landscapes better respond drought.

Language: Английский

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Ecohydrological resilience and the landscape water storage continuum in droughts

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

Published: Sept. 19, 2024

Language: Английский

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Understanding the inter-event variability of recession flow characteristics and its drivers

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133033 - 133033

Published: March 1, 2025

Language: Английский

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A GIS-based study on groundwater level fluctuation and delineation of potential zones

Environmental Earth Sciences, Journal Year: 2025, Volume and Issue: 84(9)

Published: April 21, 2025

Language: Английский

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Storage Dynamics and Groundwater–Surface Water Interactions in a Drought Sensitive Lowland Catchment: Process‐Based Modelling as a Learning Tool

Hydrological Processes, Journal Year: 2025, Volume and Issue: 39(5)

Published: May 1, 2025

ABSTRACT Groundwater is a key strategic water resource in times of drought, yet climate and land use change are increasing threats; this means that quantitative understanding groundwater dynamics lowland catchments becoming more urgent. Here, we used spatially distributed numerical model to simulate seasonal long‐term changes the spatio‐temporal patterns storage groundwater–surface interactions 66 km 2 Demnitzer Millcreek catchment (DMC) NE Germany. DMC experienced long period drought following hot, dry summer 2018, with stores depleted stream flows increasingly intermittent. The architecture parameterisation domain were based on observations, hydrogeological mapping geophysical surveys. Weekly simulations using single layer 50 × m grid 15 depth able broadly reproduce observed shallow glacial post‐glacial deposits across catchment. We showed most flow focused around topographic convergence zones fringing channel network permeable glaciofluvial deposits. Most generated by headwaters, which relatively young (i.e., ~5 years old). With potential evapotranspiration rates exceeding precipitation, balance very sensitive hydroclimate at DMC. past two decades have been dominated negative anomalies annual rainfall, causing general lowering tables persistent deficits. Spatio‐temporal recharge also strongly influenced vegetation cover, coniferous forests, particular, having high losses inhibit recharge. This underlines importance developing integrated management strategies Germany where expected further reduce increase temperatures decrease For an evidence base guide policy, need develop robust ways interface models ecohydrological better characterise impacts rechange groundwater‐dominated catchments.

Language: Английский

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Integrated ecohydrological hydrometric and stable water isotope data of a drought-sensitive mixed land use lowland catchment

Earth system science data, Journal Year: 2023, Volume and Issue: 15(4), P. 1543 - 1554

Published: April 5, 2023

Abstract. Data from long-term experimental catchments are the foundation of hydrological sciences and crucial for benchmarking process understanding, observing trends natural cycles, being prerequisites testing predictive models. Integrated data sets which capture all compartments our landscapes particularly important in times land use climate change. Here, we present ecohydrological measured at multiple spatial scales allow differentiation “blue” water fluxes (which maintain streamflow generation groundwater recharge) “green” sustain vegetation growth). There two particular unique aspects to this set: (a) stable isotopes different landscape (i.e. precipitation, surface water, soil, groundwater, plant water), (b) conducted monitoring during extreme drought 2018 central Europe. Stable so useful hydrology as they provide “fingerprints” pathways took when moving through a catchment. Thus, one evaluate dynamic relationships between storage changes fluxes, is fundamental understanding how respond hydroclimate perturbations or abrupt conversion. Second, until 2020, can also investigate recovery stores after droughts. Last but not least, lowland headwaters often understudied systems despite them providing ecosystem services such drinking provision management forestry agriculture. The available https://doi.org/10.18728/igb-fred-826.3 (Dämpfling, 2023).

Language: Английский

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