Lessons learned from the spatiotemporal analysis of long‐term and time‐variable young water fractions of large central European river basins DOI Creative Commons
Michael Stockinger, Christine Stumpp

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(2)

Published: Feb. 1, 2024

Abstract The transit time of precipitation entering a catchment and leaving it as streamflow spatiotemporally varies according to the flow paths that takes. However, investigating influences hydrometeorological variables characteristics on time‐variable times is challenging due complex water through heterogeneous landscapes. Recent studies investigated fraction younger than approximately 3 months (Fyw) using multi‐year data (long‐term Fyw) or one‐year calculation windows investigate its time‐variability (time‐variable Fyw). Nonetheless, still unclear if inter‐annual variability Fyw hydrological uncertainty, no minimum series length for long‐term was defined yet. Here, we impact Fyw, depending discharge nine river basins in Central Europe. All methods estimating led similar results, with deemed unreliable monthly sampling interval isotopes. Danube Rhine had lowest (0.06), medium (0.20) were found eastern (e.g., Oder), western ones Mosel) highest (0.33). Spatial analysis indicated negative relationship between altitude. Contradicting lacking spatiotemporal relationships other pointed unknown influential factors controlling runoff process. Using duration curves, low indicating old their stems from large subsurface storage. With increasing window size, within‐basin decreased. Long‐term depended method used define ‘long‐term’ start end date. We thus recommend future calculate facilitate comparability different catchments, account this source uncertainty. Further, more are needed diverse catchments impacts generation processes.

Language: Английский

Transit Time Estimation in Catchments: Recent Developments and Future Directions DOI Creative Commons
Paolo Benettin, Nicolas Rodriguez, Matthias Sprenger

et al.

Water Resources Research, Journal Year: 2022, Volume and Issue: 58(11)

Published: Nov. 1, 2022

Abstract Water transit time is now a standard measure in catchment hydrological and ecohydrological research. The last comprehensive review of modeling approaches was published 15+ years ago. But since then the field has largely expanded with new data, theory applications. Here, we these developments focus on water‐age‐balance data‐based approaches. We discuss compare methods including StorAge‐Selection functions, well/partially mixed compartments, water age tracking through spatially distributed models, direct estimates from controlled experiments, young fractions, ensemble hydrograph separation. unify some heterogeneity literature that crept many approaches, an attempt to clarify key differences similarities among them. Finally, point open questions research, what still need theory, work, community practice.

Language: Английский

Citations

91
Ecosystem adaptation to climate change: the sensitivity of hydrological predictions to time-dynamic model parameters DOI Creative Commons
Laurène Bouaziz, Emma Aalbers, Albrecht Weerts

et al.

Hydrology and earth system sciences, Journal Year: 2022, Volume and Issue: 26(5), P. 1295 - 1318

Published: March 9, 2022

Abstract. Future hydrological behavior in a changing world is typically predicted based on models that are calibrated past observations, disregarding systems and, therefore, model parameters may change as well. In reality, experience almost continuous over wide spectrum of temporal and spatial scales. particular, there growing evidence vegetation adapts to climatic conditions by adjusting its root zone storage capacity, which the key parameter any terrestrial system. addition, other species become dominant, both under natural anthropogenic influence. this study, we test sensitivity predictions changes reflect ecosystem adaptation climate potential land use changes. We propose top-down approach, directly uses projected data estimate how capacity at catchment scale response magnitude seasonality hydro-climatic variables. Additionally, long-term water balance characteristics different dominant ecosystems used predict future space-for-time exchange. hypothesize result 2 K global warming more pronounced when explicitly considering subsurface system properties induced environmental conditions. our hypothesis Meuse basin four scenarios designed comparison current-day conditions, using process-based with (a) stationary system, i.e., no assumed historical use, (b) an adapted but (c, d) two hypothetical use. found larger capacities (+34 %) warmer summers strong seasonal response. More specifically, streamflow groundwater up −15 % −10 lower autumn, respectively, due +14 higher summer evaporation non-stationary compared benchmark scenario. By integrating time-dynamic representation models, make step towards reliable change.

Language: Английский

Citations

55
Influence of irrigation on root zone storage capacity estimation DOI Creative Commons
Fransje van Oorschot, Ruud van der Ent, Andrea Alessandri

et al.

Hydrology and earth system sciences, Journal Year: 2024, Volume and Issue: 28(10), P. 2313 - 2328

Published: May 31, 2024

Abstract. Vegetation plays a crucial role in regulating the water cycle through transpiration, which is flux from subsurface to atmosphere via roots. The amount and timing of transpiration controlled by interplay seasonal energy supply. latter strongly depends on size root zone storage capacity (Sr), represents maximum accessible volume that vegetation can use for transpiration. Sr primarily influenced hydroclimatic conditions, as optimizes its system such way it guarantees uptake overcomes dry periods. estimates are commonly derived deficits result phase shift between signals inflow (i.e., precipitation) outflow evaporation). In irrigated croplands, irrigation serves an additional input into zone. However, this aspect has been ignored many studies, extent influences never comprehensively quantified. study, our objective quantify influence identify regional differences therein. To end, we integrated two methods, based respective area fractions, estimation. We evaluated effects compared with do not consider sample 4856 catchments globally varying degrees activity. Our results show consistently decreased when considering irrigation, larger effect area. For fraction exceeding 10 %, median decrease was 19 23 mm corresponding decreases 12 % 15 respectively. most tropical climates. relative largest temperate demonstrate, first time, considerable over croplands. This strong snowmelt have previously documented precipitation falling snow.

Language: Английский

Citations

11
A Signature‐Based Hydrologic Efficiency Metric for Model Calibration and Evaluation in Gauged and Ungauged Catchments DOI Creative Commons
Melike Kiraz, Gemma Coxon, Thorsten Wagener

et al.

Water Resources Research, Journal Year: 2023, Volume and Issue: 59(11)

Published: Oct. 27, 2023

Abstract Rainfall‐runoff models are commonly evaluated against statistical evaluation metrics. However, these metrics do not provide much insight into what is hydrologically wrong if a model fails to simulate observed streamflow well and they also applicable for ungauged catchments. Here, we propose signature‐based hydrologic efficiency (SHE) metric by replacing the components of current with signatures that can be regionalized in We test our new across 633 catchments from Great Britain. Strong correlations Spearman rank Pearson correlation values around 0.8 found between proposed used (NSE, KGE, NP) demonstrating SHE related existing as each other. For catchments, regionalize three included find 78% have an absolute difference gauged cases less than 0.2. This varies depending on quality bias variance signature values. It means its well. When applying other domains different properties, modellers should carefully consider best suited their research regionalization potential.

Language: Английский

Citations

22
Challenges in studying water fluxes within the soil-plant-atmosphere continuum: A tracer-based perspective on pathways to progress DOI
Natalie Orlowski, Michael Rinderer, Maren Dubbert

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 881, P. 163510 - 163510

Published: April 12, 2023

Language: Английский

Citations

18
Geologic Controls on Apparent Root‐Zone Storage Capacity DOI Creative Commons
W. Jesse Hahm, David Dralle, Dana Lapides

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(3)

Published: March 1, 2024

Abstract The water storage capacity of the root zone can determine whether plants survive dry periods and control partitioning precipitation into streamflow evapotranspiration. It is currently thought that top‐down, climatic factors are primary on this via their interaction with plant rooting adaptations. However, it remains unclear to what extent bottom‐up, geologic provide an additional constraint capacity. Here we use a machine learning approach identify regions lower than climatically expected apparent We find in seasonally California these overlap particular substrates. hypothesize patterns reflect diverse mechanisms by which substrate limit capacity, highlight case studies consistent limited weathered bedrock (melange Northern Coast Range), toxicity (ultramafic substrates Klamath‐Siskiyou region), nutrient limitation (phosphorus‐poor plutons southern Sierra Nevada), low porosity capable retaining (volcanic formations Cascades). observation at regional scales climate alone does not “size” has implications for parameterization models dynamics (and interrelated carbon cycles), also underscores importance geology considerations climate‐change induced biome migration habitat suitability.

Language: Английский

Citations

7
Assessment of streamwater age using water stable isotopes in a headwater catchment of the central Tibetan Plateau DOI
Shaoyong Wang, Xiaobo He, Shichang Kang

et al.

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 618, P. 129175 - 129175

Published: Jan. 31, 2023

Language: Английский

Citations

15
Stable water isotopes and tritium tracers tell the same tale: no evidence for underestimation of catchment transit times inferred by stable isotopes in StorAge Selection (SAS)-function models DOI Creative Commons
Siyuan Wang, Markus Hrachowitz, Gerrit Schoups

et al.

Hydrology and earth system sciences, Journal Year: 2023, Volume and Issue: 27(16), P. 3083 - 3114

Published: Aug. 24, 2023

Abstract. Stable isotopes (δ18O) and tritium (3H) are frequently used as tracers in environmental sciences to estimate age distributions of water. However, it has previously been argued that seasonally variable tracers, such δ18O, generally systematically fail detect the tails water therefore substantially underestimate ages compared radioactive 3H. In this study for Neckar River basin central Europe based on a >20-year record hydrological, δ18O 3H data, we scrutinized above postulate together with potential role spatial aggregation effects exacerbating underestimation ages. This was done by comparing inferred from total 21 different model implementations, including time-invariant, lumped-parameter sine-wave (SW) convolution integral (CO) models well StorAge Selection (SAS)-function (P-SAS) integrated hydrological combination SAS functions (IM-SAS). We found that, indeed, commonly SW CO mean transit times (MTTs) ∼ 1–2 years lower than those obtained same models, reaching MTTs ∼10 years. contrast, several implementations P-SAS IM-SAS not only allowed simultaneous representations storage variations streamflow stream signals, but these were, 11–17 years, also much higher similar 3H, which suggested 11–13 Characterized parameter posterior distributions, particular parameters control age, individually constrained or observations exhibited limited differences magnitudes parts temporal variability time (TTDs) response changing wetness conditions. suggests both lead comparable descriptions how is routed through system. These findings provide evidence us reject hypothesis tracer “cannot see older about 4 years” truncates corresponding leading underestimations Instead, our results broad equivalence systems characterized at least 15–20 The question degree heterogeneity can further adversely affect estimates remains unresolved lumped distributed provided inconclusive results. Overall, demonstrates reported most likely result use other per se. Rather, largely be attributed choices approaches complexity considering transient conditions next aspects. Given additional vulnerability due potentially still unknown effects, advocate avoiding type if possible instead adopting SAS-based time-variant formulations models.

Language: Английский

Citations

13
Root zone in the Earth system DOI Creative Commons
Hongkai Gao, Markus Hrachowitz, Lan Wang‐Erlandsson

et al.

Hydrology and earth system sciences, Journal Year: 2024, Volume and Issue: 28(19), P. 4477 - 4499

Published: Oct. 14, 2024

Abstract. The root zone is a vital part of the Earth system and key element in hydrology, ecology, agronomy, land surface processes. However, its definition varies across disciplines, creating barriers to interdisciplinary understanding. Moreover, characterizing challenging due lack consensus on definitions, estimation methods, their merits limitations. This opinion paper provides holistic from hydrology perspective, including moisture storage, deficit, storage capacity. We demonstrate that plays critical role biosphere, pedosphere, rhizosphere, lithosphere, atmosphere, cryosphere system. underscore limitations traditional reductionist approach modelling this complex dynamic advocate for shift towards holistic, ecosystem-centred approach. argue offers more systematic, simple, dynamic, scalable, observable way describe predict science.

Language: Английский

Citations

5
Multi-decadal fluctuations in root zone storage capacity through vegetation adaptation to hydro-climatic variability have minor effects on the hydrological response in the Neckar River basin, Germany DOI Creative Commons
Siyuan Wang, Markus Hrachowitz, Gerrit Schoups

et al.

Hydrology and earth system sciences, Journal Year: 2024, Volume and Issue: 28(17), P. 4011 - 4033

Published: Sept. 3, 2024

Abstract. Climatic variability can considerably affect catchment-scale root zone storage capacity (Sumax), which is a critical factor regulating latent heat fluxes and thus the moisture exchange between land atmosphere as well hydrological response biogeochemical processes in terrestrial systems. However, direct quantification of changes Sumax over long time periods mechanistic drivers thereof at catchment scale are missing so far. As consequence, it remains unclear how climatic variability, such precipitation regime or canopy water demand, affects fluctuations may influence partitioning therefore also scale. Based on long-term daily records (1953–2022) upper Neckar River basin Germany, we found that hydro-climatic conditions, with an aridity index IA (i.e. EP/P) ranging ∼ 0.9 1.1 multiple consecutive 20-year periods, was accompanied by deviations ΔIE −0.02 0.01 from expected IE inferred parametric Budyko curve. Similarly, Sumax, 95 115 mm 20 %, were observed same period. While uncorrelated mean potential evaporation, shown magnitude controlled ratio winter to summer (p < 0.05). In other words, study region does not depend overall wetness condition for example expressed IA, but rather supply distributed year. be ΔIE. Consequently, replacing average, time-invariant estimate time-variable, dynamically changing formulation parameter model did result improved representation fluxes, (and thereof), shorter-term dynamics. Overall, this provides quantitative evidence significantly decades, reflecting vegetation adaptation variability. temporal evolution cannot explain heat) curve different conditions. have any significant effects characteristics catchment. This further suggests accounting time-variable improve its ability reproduce minor importance predicting climate next decades come.

Language: Английский

Citations

4